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Couldn't parse the HTML tags from live site in android

We are working on a power shut down app in android domain for a particular region.so we need the live update details from the URL.so we need to get the HTML tags from the live site.we got nothing.
For example in this app we get a title from the live URL and put it in a text view
the code comes here.We are using JSOUP to get the values.
package com.example.poweralert.app;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Documented;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import android.app.ProgressDialog;
import android.provider.DocumentsContract;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.content.Intent;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.jsoup.nodes.Document;
public class PrimaryActivity extends ActionBarActivity {
private RadioGroup radioOptionGroup;
private RadioButton radiooptiobtn;
private Button btnDisplay;
/*public String loadJSONFromAsset() {
String json = null;
try {
InputStream is = getAssets().open("locate.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}*/
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_primary);
String title=null;
Document document;
try {
document= Jsoup.connect("https://www.facebook.com/")
.userAgent("Mozilla/5.0 (Windows; U; WindowsNT 5.1; en-US; rv1.8.1.6) Gecko/20070725 Firefox/2.0.0.6")
.referrer("http://www.google.com")
.get();
title=document.title();
TextView text=(TextView)findViewById(R.id.textView);
text.setText(title);
} catch (Exception e) {
e.printStackTrace();
Log.d("tag","document");
}
/*List<String> formList= new ArrayList<String>();
try {
JSONObject jSONObject = new JSONObject(loadJSONFromAsset());
JSONArray jsonArray = jSONObject.getJSONArray("Manali");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jo_inside = jsonArray.getJSONObject(i);
if (jo_inside.has("location")) {
formList.add(jo_inside.getString("location"));
}
}
ListView listView = (ListView) findViewById(R.id.listView1);
listView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, formList));
} catch (JSONException e) {
e.printStackTrace();
}*/
Button button= (Button) findViewById(R.id.btndis);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
}
}
how to show the live URL site title in text view.the above code shows nothing.
myHtml
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView"
android:text="html text"
android:layout_below="#+id/searchView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="85dp"
android:layout_marginTop="50dp" />
</RelativeLayout>
also got this in log cat when running the app
04-03 12:29:11.123 26083-26083/com.example.ipower.app D/dalvikvm﹕ Zygote::ForkAndSpecialize : 0
04-03 12:29:11.124 26083-26083/com.example.ipower.app D/dalvikvm﹕ zygote get new systemTid : 26083
04-03 12:29:11.124 26083-26083/com.example.ipower.app D/dalvikvm﹕ Late-enabling CheckJNI
04-03 12:29:11.127 26083-26083/com.example.ipower.app D/jdwp﹕ prepping for JDWP over ADB
04-03 12:29:11.127 26083-26083/com.example.ipower.app D/jdwp﹕ ADB transport startup
04-03 12:29:11.127 26083-26086/com.example.ipower.app D/dalvikvm﹕ Elevating priority from 0 to -8
04-03 12:29:11.127 26083-26087/com.example.ipower.app D/jdwp﹕ JDWP: thread running
04-03 12:29:11.130 26083-26087/com.example.ipower.app D/jdwp﹕ acceptConnection
04-03 12:29:11.130 26083-26087/com.example.ipower.app D/jdwp﹕ trying to receive file descriptor from ADB
04-03 12:29:11.143 26083-26087/com.example.ipower.app D/jdwp﹕ received file descriptor 40 from ADB
04-03 12:29:11.144 26083-26083/com.example.ipower.app D/dalvikvm﹕ zygote get thread init done
04-03 12:29:11.148 26083-26087/com.example.ipower.app D/jdwp﹕ processIncoming
04-03 12:29:11.148 26083-26087/com.example.ipower.app D/jdwp﹕ processIncoming
04-03 12:29:11.148 26083-26087/com.example.ipower.app D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x13, id=0x40000024, flags=0x0, dataLen=0x8
04-03 12:29:11.162 26083-26087/com.example.ipower.app D/jdwp﹕ processIncoming
04-03 12:29:11.162 26083-26087/com.example.ipower.app D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x17, id=0x40000025, flags=0x0, dataLen=0xC
04-03 12:29:11.170 26083-26087/com.example.ipower.app D/jdwp﹕ processIncoming
04-03 12:29:11.170 26083-26087/com.example.ipower.app D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x13, id=0x40000026, flags=0x0, dataLen=0x8
04-03 12:29:11.176 26083-26087/com.example.ipower.app D/jdwp﹕ processIncoming
04-03 12:29:11.176 26083-26087/com.example.ipower.app D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x13, id=0x40000027, flags=0x0, dataLen=0x8
04-03 12:29:11.715 26083-26083/com.example.ipower.app D/jdwp﹕ sendBufferedRequest : len=0x3D
04-03 12:29:12.295 26083-26083/com.example.ipower.app D/jdwp﹕ sendBufferedRequest : len=0x47
04-03 12:29:12.464 26083-26083/com.example.ipower.app W/asset﹕ AssetManager-->addDefaultAssets CIP path not exsit!
04-03 12:29:13.130 26083-26083/com.example.ipower.app W/System.err﹕ android.os.NetworkOnMainThreadException
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1128)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at java.net.InetAddress.getAllByName(InetAddress.java:214)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
04-03 12:29:13.139 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:449)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:434)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:181)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at org.jsoup.helper.HttpConnection.get(HttpConnection.java:170)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at com.example.ipower.app.MainActivity.onCreate(MainActivity.java:29)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.Activity.performCreate(Activity.java:5122)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
04-03 12:29:13.140 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)
04-03 12:29:13.141 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread.access$600(ActivityThread.java:162)
04-03 12:29:13.142 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
04-03 12:29:13.142 26083-26083/com.example.ipower.app W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:107)
04-03 12:29:13.142 26083-26083/com.example.ipower.app W/System.err﹕ at android.os.Looper.loop(Looper.java:194)
04-03 12:29:13.142 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5371)
04-03 12:29:13.142 26083-26083/com.example.ipower.app W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
04-03 12:29:13.142 26083-26083/com.example.ipower.app W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:525)
04-03 12:29:13.142 26083-26083/com.example.ipower.app W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
04-03 12:29:13.142 26083-26083/com.example.ipower.app W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
04-03 12:29:13.143 26083-26083/com.example.ipower.app W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
04-03 12:29:13.143 26083-26083/com.example.ipower.app I/System.out﹕ [CDS] fix other exception in HttpUrlConnection
04-03 12:29:13.143 26083-26083/com.example.ipower.app W/System.err﹕ java.io.IOException
04-03 12:29:13.143 26083-26083/com.example.ipower.app W/System.err﹕ at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:87)
04-03 12:29:13.143 26083-26083/com.example.ipower.app W/System.err﹕ at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:449)
04-03 12:29:13.143 26083-26083/com.example.ipower.app W/System.err﹕ at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:434)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:181)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at org.jsoup.helper.HttpConnection.get(HttpConnection.java:170)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at com.example.ipower.app.MainActivity.onCreate(MainActivity.java:29)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.Activity.performCreate(Activity.java:5122)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread.access$600(ActivityThread.java:162)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:107)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.os.Looper.loop(Looper.java:194)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5371)
04-03 12:29:13.144 26083-26083/com.example.ipower.app W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
04-03 12:29:13.145 26083-26083/com.example.ipower.app W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:525)
04-03 12:29:13.145 26083-26083/com.example.ipower.app W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
04-03 12:29:13.145 26083-26083/com.example.ipower.app W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
04-03 12:29:13.145 26083-26083/com.example.ipower.app W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
04-03 12:29:13.171 26083-26083/com.example.ipower.app V/PhoneWindow﹕ DecorView setVisiblity: visibility = 4
04-03 12:29:14.790 26083-26083/com.example.ipower.app V/PhoneWindow﹕ DecorView setVisiblity: visibility = 0
04-03 12:29:14.919 26083-26083/com.example.ipower.app D/libEGL﹕ loaded /system/lib/egl/libEGL_mali.so
04-03 12:29:14.936 26083-26083/com.example.ipower.app D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_mali.so
04-03 12:29:14.941 26083-26083/com.example.ipower.app D/libEGL﹕ loaded /system/lib/egl/libGLESv2_mali.so
04-03 12:29:15.013 26083-26083/com.example.ipower.app D/OpenGLRenderer﹕ Enabling debug mode 0

Text Watcher android in on create

I have been trying to use textwatcher.
i called the function addTextChangedListener(this) , from onCreate but the application crashed because of this command.
please help .
private EditText txt1;
private EditText txt2;
private EditText txt3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
txt1 = (EditText) findViewById(R.id.signup_username);
txt2 = (EditText) findViewById(R.id.signup_password);
txt3 = (EditText) findViewById(R.id.signup_email);
txt1.addTextChangedListener(this);
txt2.addTextChangedListener(this);
txt3.addTextChangedListener(this);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
And :
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
}
#Override
public void afterTextChanged(Editable s) {
View view = getCurrentFocus();
int id = view.getId();
if (id == R.id.signup_username) {
String username = ((EditText) view).getText().toString();
for (int i = 0; i < username.length(); i++) {
if (username.charAt(i) < 'a' || username.charAt(i) > 'z') {
Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
break;
}
else {
Toast.makeText(getApplicationContext(), "Murad", Toast.LENGTH_SHORT).show();
break;
}
}
}
else {
Toast.makeText(getApplicationContext(), "Oren", Toast.LENGTH_SHORT).show();
}
}
}
log:
04-03 11:37:22.684: D/skia(23439): new locale en-Latn-GB
04-03 11:37:22.854: D/libEGL(23439): loaded /vendor/lib/egl/libEGL_adreno.so
04-03 11:37:22.854: D/libEGL(23439): loaded /vendor/lib/egl/libGLESv1_CM_adreno.so
04-03 11:37:22.864: D/libEGL(23439): loaded /vendor/lib/egl/libGLESv2_adreno.so
04-03 11:37:22.864: I/Adreno-EGL(23439): <qeglDrvAPI_eglInitialize:316>: EGL 1.4 QUALCOMM build: (CL4169980)
04-03 11:37:22.864: I/Adreno-EGL(23439): OpenGL ES Shader Compiler Version: 17.01.10.SPL
04-03 11:37:22.864: I/Adreno-EGL(23439): Build Date: 09/26/13 Thu
04-03 11:37:22.864: I/Adreno-EGL(23439): Local Branch:
04-03 11:37:22.864: I/Adreno-EGL(23439): Remote Branch:
04-03 11:37:22.864: I/Adreno-EGL(23439): Local Patches:
04-03 11:37:22.864: I/Adreno-EGL(23439): Reconstruct Branch:
04-03 11:37:22.914: D/OpenGLRenderer(23439): Enabling debug mode 0
04-03 11:37:39.971: D/AndroidRuntime(23439): Shutting down VM
04-03 11:37:39.971: W/dalvikvm(23439): threadid=1: thread exiting with uncaught exception (group=0x41b2b898)
04-03 11:37:39.981: E/AndroidRuntime(23439): FATAL EXCEPTION: main
04-03 11:37:39.981: E/AndroidRuntime(23439): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.poca2/com.example.poca2.RegisterActivity}: java.lang.NullPointerException
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.app.ActivityThread.access$700(ActivityThread.java:159)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.os.Handler.dispatchMessage(Handler.java:99)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.os.Looper.loop(Looper.java:137)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.app.ActivityThread.main(ActivityThread.java:5419)
04-03 11:37:39.981: E/AndroidRuntime(23439): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 11:37:39.981: E/AndroidRuntime(23439): at java.lang.reflect.Method.invoke(Method.java:525)
04-03 11:37:39.981: E/AndroidRuntime(23439): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
04-03 11:37:39.981: E/AndroidRuntime(23439): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
04-03 11:37:39.981: E/AndroidRuntime(23439): at dalvik.system.NativeStart.main(Native Method)
04-03 11:37:39.981: E/AndroidRuntime(23439): Caused by: java.lang.NullPointerException
04-03 11:37:39.981: E/AndroidRuntime(23439): at com.example.poca2.RegisterActivity.onCreate(RegisterActivity.java:33)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.app.Activity.performCreate(Activity.java:5372)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
04-03 11:37:39.981: E/AndroidRuntime(23439): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
04-03 11:37:39.981: E/AndroidRuntime(23439): ... 11 more
04-03 11:37:44.545: D/skia(23761): new locale en-Latn-GB
04-03 11:37:44.776: D/libEGL(23761): loaded /vendor/lib/egl/libEGL_adreno.so
04-03 11:37:44.786: D/libEGL(23761): loaded /vendor/lib/egl/libGLESv1_CM_adreno.so
04-03 11:37:44.786: D/libEGL(23761): loaded /vendor/lib/egl/libGLESv2_adreno.so
04-03 11:37:44.786: I/Adreno-EGL(23761): <qeglDrvAPI_eglInitialize:316>: EGL 1.4 QUALCOMM build: (CL4169980)
04-03 11:37:44.786: I/Adreno-EGL(23761): OpenGL ES Shader Compiler Version: 17.01.10.SPL
04-03 11:37:44.786: I/Adreno-EGL(23761): Build Date: 09/26/13 Thu
04-03 11:37:44.786: I/Adreno-EGL(23761): Local Branch:
04-03 11:37:44.786: I/Adreno-EGL(23761): Remote Branch:
04-03 11:37:44.786: I/Adreno-EGL(23761): Local Patches:
04-03 11:37:44.786: I/Adreno-EGL(23761): Reconstruct Branch:
04-03 11:37:44.836: D/OpenGLRenderer(23761): Enabling debug mode 0
04-03 11:37:48.069: D/AndroidRuntime(23761): Shutting down VM
04-03 11:37:48.069: W/dalvikvm(23761): threadid=1: thread exiting with uncaught exception (group=0x41b2b898)
04-03 11:37:48.069: E/AndroidRuntime(23761): FATAL EXCEPTION: main
04-03 11:37:48.069: E/AndroidRuntime(23761): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.poca2/com.example.poca2.RegisterActivity}: java.lang.NullPointerException
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.app.ActivityThread.access$700(ActivityThread.java:159)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.os.Handler.dispatchMessage(Handler.java:99)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.os.Looper.loop(Looper.java:137)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.app.ActivityThread.main(ActivityThread.java:5419)
04-03 11:37:48.069: E/AndroidRuntime(23761): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 11:37:48.069: E/AndroidRuntime(23761): at java.lang.reflect.Method.invoke(Method.java:525)
04-03 11:37:48.069: E/AndroidRuntime(23761): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
04-03 11:37:48.069: E/AndroidRuntime(23761): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
04-03 11:37:48.069: E/AndroidRuntime(23761): at dalvik.system.NativeStart.main(Native Method)
04-03 11:37:48.069: E/AndroidRuntime(23761): Caused by: java.lang.NullPointerException
04-03 11:37:48.069: E/AndroidRuntime(23761): at com.example.poca2.RegisterActivity.onCreate(RegisterActivity.java:33)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.app.Activity.performCreate(Activity.java:5372)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
04-03 11:37:48.069: E/AndroidRuntime(23761): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
04-03 11:37:48.069: E/AndroidRuntime(23761): ... 11 more
04-03 11:37:54.265: I/Process(23761): Sending signal. PID: 23761 SIG: 9
edit:
private EditText txt1;
private EditText txt2;
private EditText txt3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
txt1 = (EditText) findViewById(R.id.signup_username);
txt2 = (EditText) findViewById(R.id.signup_password);
txt3 = (EditText) findViewById(R.id.signup_email);
txt1.addTextChangedListener(new CustomTextWatcher(txt1, getApplicationContext()));
txt2.addTextChangedListener(new CustomTextWatcher(txt2, getApplicationContext()));
txt3.addTextChangedListener(new CustomTextWatcher(txt3, getApplicationContext()));
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
class CustomTextWatcher implements TextWatcher {
EditText m;
Context c;
public CustomTextWatcher (EditText e, Context context) {
m = e;
c = context;
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
}
#Override
public void afterTextChanged(Editable s) {
int id = m.getId();
if (id == R.id.signup_username) {
String username = ((EditText) m).getText().toString();
for (int i = 0; i < username.length(); i++) {
if (username.charAt(i) < 'a' || username.charAt(i) > 'z') {
Toast.makeText(c, "Error", Toast.LENGTH_SHORT).show();
break;
}
else {
Toast.makeText(c, "Murad", Toast.LENGTH_SHORT).show();
break;
}
}
}
else {
Toast.makeText(c, "Oren", Toast.LENGTH_SHORT).show();
}
}
}
here is the edited edition.

Your EditTexts are not in the activity_register layout but in the fragment and thus cannot be found with findViewById() after inflating only the activity_register layout. This causes the NPE when you're attempting to invoke a method on a null reference.
Move the findViewById() and addTextChangedListener() code to the fragment's onCreateView() where you're actually inflating the view that contains the edittexts.

Null pointer exception error android

Null pointer exception error in my fragment class. I use tab activity in my program, list view is located in fragment xml file. code:
package com.example.timetracker;
import ///
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener, LoaderCallbacks<Cursor> {
private static String TAG = "MainActivity";
private static final int CM_DELETE_ID = 1;
private static final int RESET_STOPWATCH = 2;
static ListView lvData;
static DB db;
static SimpleCursorAdapter scAdapter;
static Activity act;
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
//create my tabs...
}
}
//some code...
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
if(position == 0){
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
if (position == 1)
{
Fragment fragment2 = new DummySectionFragment2();
Bundle args = new Bundle();
args.putInt(DummySectionFragment2.ARG_SECTION_NUMBER, position + 2);
fragment2.setArguments(args);
return fragment2;
}
return null;
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
}
return null;
}
}
public static class DummySectionFragment extends Fragment{
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
View v;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_tracker,
container, false);
v = inflater.inflate(R.layout.activity_statistic,
container, false);
createList();
return rootView;
}
public void createList(){
db = new DB(act);Log.d(TAG, "1");
db.open();Log.d(TAG, "2");
String[] from = new String[] {DB.COLUMN_NAME, DB.COLUMN_TIME };Log.d(TAG, "3");
int[] to = new int[] { R.id.tvTextName, R.id.tvText_time};Log.d(TAG, "4");
scAdapter = new SimpleCursorAdapter(act, R.layout.item, null, from, to, 0);Log.d(TAG, "5");
lvData = (ListView) v.findViewById(R.id.lvData);Log.d(TAG, "6 ");
//after thap i have error
lvData.setAdapter(scAdapter);Log.d(TAG, "7");
}
}
public static class DummySectionFragment2 extends Fragment implements LoaderCallbacks<Cursor> {
//some code....
}
#Override
public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onLoadFinished(Loader<Cursor> arg0, Cursor arg1) {
// TODO Auto-generated method stub
}
#Override
public void onLoaderReset(Loader<Cursor> arg0) {
// TODO Auto-generated method stub
}
}
//Data base class
static class MyCursorLoader extends CursorLoader {
DB db;
public MyCursorLoader(Context context, DB db) {
super(context);
this.db = db;
}
#Override
public Cursor loadInBackground() {
Cursor cursor = db.getAllData();
return cursor;
}
}
}
Don't working code "lvData.setAdapter(scAdapter);Log.d(TAG, "7");" logs:
04-03 20:11:54.830: D/dalvikvm(1684): GC_FOR_ALLOC freed 97K, 6% free 2883K/3040K, paused 9ms, total 9ms
04-03 20:11:54.850: D/MainActivity(1684): 1
04-03 20:11:54.850: D/Data Base(1684): Открытие Подключения
04-03 20:11:54.858: D/Data Base(1684): Подключение открыто
04-03 20:11:54.858: D/MainActivity(1684): 2
04-03 20:11:54.858: D/MainActivity(1684): 3
04-03 20:11:54.858: D/MainActivity(1684): 4
04-03 20:11:54.858: D/MainActivity(1684): 6
04-03 20:11:54.858: D/MainActivity(1684): 5
04-03 20:11:54.858: D/AndroidRuntime(1684): Shutting down VM
04-03 20:11:54.858: W/dalvikvm(1684): threadid=1: thread exiting with uncaught exception (group=0xa4c41648)
04-03 20:11:54.858: E/AndroidRuntime(1684): FATAL EXCEPTION: main
04-03 20:11:54.858: E/AndroidRuntime(1684): java.lang.NullPointerException
04-03 20:11:54.858: E/AndroidRuntime(1684): at com.example.timetracker.MainActivity$DummySectionFragment.createList(MainActivity.java:200)
04-03 20:11:54.858: E/AndroidRuntime(1684): at com.example.timetracker.MainActivity$DummySectionFragment.onCreateView(MainActivity.java:187)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.View.measure(View.java:15848)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.View.measure(View.java:15848)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
04-03 20:11:54.858: E/AndroidRuntime(1684): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:302)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.View.measure(View.java:15848)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-03 20:11:54.858: E/AndroidRuntime(1684): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.View.measure(View.java:15848)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.Choreographer.doFrame(Choreographer.java:532)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.os.Handler.handleCallback(Handler.java:730)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.os.Handler.dispatchMessage(Handler.java:92)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.os.Looper.loop(Looper.java:137)
04-03 20:11:54.858: E/AndroidRuntime(1684): at android.app.ActivityThread.main(ActivityThread.java:5103)
04-03 20:11:54.858: E/AndroidRuntime(1684): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 20:11:54.858: E/AndroidRuntime(1684): at java.lang.reflect.Method.invoke(Method.java:525)
04-03 20:11:54.858: E/AndroidRuntime(1684): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
04-03 20:11:54.858: E/AndroidRuntime(1684): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
04-03 20:11:54.858: E/AndroidRuntime(1684): at dalvik.system.NativeStart.main(Native Method)

Your call to v.findViewById(R.id.lvData); is returning null. This would seem to be because you haven't put any views into the structure called v. You are then trying to use the null on the line below, and that is what causes the exception.

having error "Unfortunately you ### application has stopped"

This is a food recipe application and I am just learning so if you could please help me rectify my error and explain, I will be so grateful. Thanks in advance
Main activity
package rice.recipe;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ListView;
public class RiceActivity extends Activity {
private RiceRecipeDataSource ds;
private ListView recipelistview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rice);
ds=new RiceRecipeDataSource();
recipelistview=(ListView)findViewById(rice.recipe.R.id.listView1);
recipelistview.setAdapter(new RiceRecipeDataSourceAdapter(this,ds ));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.rice, menu);
return true;
}
}
ADAPTER code
package rice.recipe;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class RiceRecipeDataSourceAdapter extends BaseAdapter {
private Context mycontext;
private LayoutInflater myinflater;
private RiceRecipeDataSource mydatasource;
public RiceRecipeDataSourceAdapter(Context ctx,RiceRecipeDataSource ds)
{
mycontext=ctx;
mydatasource=ds;
myinflater=(LayoutInflater)mycontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return mydatasource.getDataSourceLength();
}
#Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView thumbnail;
TextView name;
if (convertView==null)
convertView=myinflater.inflate(rice.recipe.R.layout.activity_rice, parent,false);
thumbnail=(ImageView)convertView.findViewById(rice.recipe.R.id.imageView1);
thumbnail.setImageResource(mydatasource.getPhotoPool().get(position));
name=(TextView)convertView.findViewById((rice.recipe.R.id.textView1));
name.setText(mydatasource.getDishesPool().get(position));
return convertView;
}
}
DATA SOURCE code
package rice.recipe;
import java.util.ArrayList;
public class RiceRecipeDataSource
{
private ArrayList<Integer> photoPool;
private ArrayList<Integer> descriptionPool;
private ArrayList<Integer> dishesPool;
public ArrayList<Integer> getPhotoPool()
{
return photoPool;
}
public ArrayList<Integer> getDescriptionPool()
{
return descriptionPool;
}
public ArrayList<Integer> getDishesPool()
{
return dishesPool;
}
public RiceRecipeDataSource()
{
photoPool=new ArrayList<Integer>();
descriptionPool=new ArrayList<Integer>();
dishesPool=new ArrayList<Integer>();
setupPhotopool();
setupDescriptionpool();
setupDishespool();
}
public void setupPhotopool()
{
photoPool.add(rice.recipe.R.drawable.jollofrice);
photoPool.add(rice.recipe.R.drawable.friedrice);
photoPool.add(rice.recipe.R.drawable.spaghetti);
photoPool.add(rice.recipe.R.drawable.coconutrice);
photoPool.add(rice.recipe.R.drawable.ricenbeans);
photoPool.add(rice.recipe.R.drawable.whiterice);
}
public void setupDishespool()
{
dishesPool.add(rice.recipe.R.string.jellof);
dishesPool.add(rice.recipe.R.string.fried_rice);
dishesPool.add(rice.recipe.R.string.spag);
dishesPool.add(rice.recipe.R.string.coconut);
dishesPool.add(rice.recipe.R.string.rice_beans);
dishesPool.add(rice.recipe.R.string.plain_rice);
}
public void setupDescriptionpool()
{
descriptionPool.add(rice.recipe.R.string.jellof_desc);
descriptionPool.add(rice.recipe.R.string.friedr_desc);
descriptionPool.add(rice.recipe.R.string.spag_desc);
descriptionPool.add(rice.recipe.R.string.coconut_desc);
}
public int getDataSourceLength()
{
return photoPool.size();
}
}
This is my LogCat
04-03 05:47:34.217: D/dalvikvm(865): GC_FOR_ALLOC freed 39K, 6% free 2657K/2816K, paused 78ms, total 83ms
04-03 05:47:34.237: I/dalvikvm-heap(865): Grow heap (frag case) to 3.783MB for 1127536-byte allocation
04-03 05:47:34.317: D/dalvikvm(865): GC_FOR_ALLOC freed 2K, 5% free 3756K/3920K, paused 80ms, total 80ms
04-03 05:47:34.421: D/dalvikvm(865): GC_CONCURRENT freed <1K, 5% free 3760K/3920K, paused 13ms+20ms, total 108ms
04-03 05:47:34.697: D/AndroidRuntime(865): Shutting down VM
04-03 05:47:34.697: W/dalvikvm(865): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-03 05:47:34.778: E/AndroidRuntime(865): FATAL EXCEPTION: main
04-03 05:47:34.778: E/AndroidRuntime(865): java.lang.NullPointerException
04-03 05:47:34.778: E/AndroidRuntime(865): at rice.recipe.RiceRecipeDataSourceAdapter.getView(RiceRecipeDataSourceAdapter.java:52)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.AbsListView.obtainView(AbsListView.java:2159)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.ListView.measureHeightOfChildren(ListView.java:1246)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.ListView.onMeasure(ListView.java:1158)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.View.measure(View.java:15518)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:666)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.View.measure(View.java:15518)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.View.measure(View.java:15518)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.View.measure(View.java:15518)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-03 05:47:34.778: E/AndroidRuntime(865): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.View.measure(View.java:15518)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.Choreographer.doFrame(Choreographer.java:532)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.os.Handler.handleCallback(Handler.java:725)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.os.Handler.dispatchMessage(Handler.java:92)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.os.Looper.loop(Looper.java:137)
04-03 05:47:34.778: E/AndroidRuntime(865): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-03 05:47:34.778: E/AndroidRuntime(865): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 05:47:34.778: E/AndroidRuntime(865): at java.lang.reflect.Method.invoke(Method.java:511)
04-03 05:47:34.778: E/AndroidRuntime(865): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-03 05:47:34.778: E/AndroidRuntime(865): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-03 05:47:34.778: E/AndroidRuntime(865): at dalvik.system.NativeStart.main(Native Method)
Manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="rice.recipe"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="rice.recipe.RiceActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.main" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
after editing, new logcat
04-03 07:23:36.608: D/dalvikvm(933): GC_FOR_ALLOC freed 46K, 6% free 2657K/2824K, paused 175ms, total 179ms
04-03 07:23:36.631: I/dalvikvm-heap(933): Grow heap (frag case) to 3.783MB for 1127536-byte allocation
04-03 07:23:36.709: D/dalvikvm(933): GC_FOR_ALLOC freed 2K, 5% free 3756K/3928K, paused 75ms, total 75ms
04-03 07:23:36.858: D/dalvikvm(933): GC_CONCURRENT freed <1K, 4% free 3771K/3928K, paused 13ms+19ms, total 153ms
04-03 07:23:37.161: D/AndroidRuntime(933): Shutting down VM
04-03 07:23:37.161: W/dalvikvm(933): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-03 07:23:37.248: E/AndroidRuntime(933): FATAL EXCEPTION: main
04-03 07:23:37.248: E/AndroidRuntime(933): java.lang.NullPointerException
04-03 07:23:37.248: E/AndroidRuntime(933): at rice.recipe.RiceRecipeDataSourceAdapter.getView(RiceRecipeDataSourceAdapter.java:52)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.AbsListView.obtainView(AbsListView.java:2159)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.ListView.measureHeightOfChildren(ListView.java:1246)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.ListView.onMeasure(ListView.java:1158)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.View.measure(View.java:15518)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:666)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.View.measure(View.java:15518)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.View.measure(View.java:15518)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.View.measure(View.java:15518)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-03 07:23:37.248: E/AndroidRuntime(933): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.View.measure(View.java:15518)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.Choreographer.doFrame(Choreographer.java:532)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.os.Handler.handleCallback(Handler.java:725)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.os.Handler.dispatchMessage(Handler.java:92)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.os.Looper.loop(Looper.java:137)
04-03 07:23:37.248: E/AndroidRuntime(933): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-03 07:23:37.248: E/AndroidRuntime(933): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 07:23:37.248: E/AndroidRuntime(933): at java.lang.reflect.Method.invoke(Method.java:511)
04-03 07:23:37.248: E/AndroidRuntime(933): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-03 07:23:37.248: E/AndroidRuntime(933): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-03 07:23:37.248: E/AndroidRuntime(933): at dalvik.system.NativeStart.main(Native Method)

You are not following the Adapter customization properly. Check this . Your getView should be like the given code snippet. Can also check this

Java app crashes (NullPointerException)

i'm just programming a password manager but every time I run it, it crashed in cause of NullPointerException. I checked the code but i'm a new developer. Someone here who knows why? :(
Code of MainActivity.java:
package de.lennartschoch.passwordmanager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
Button login;
EditText masterpassfield;
static String masterpass;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
login = (Button) findViewById(R.id.login);
masterpass = "";
masterpassfield = (EditText) findViewById(R.id.masterpass);
if(masterpass.equals("")) {
Intent intent = new Intent(this,NewMasterpass.class);
startActivity(intent);
return;
}
login.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
if(masterpassfield.getText().toString().equals(masterpass)) {
Intent success = new Intent(view.getContext(), Passwords.class);
startActivityForResult(success, 0);
}
}});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Code of NewMasterpass.java:
package de.lennartschoch.passwordmanager;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class NewMasterpass extends Activity {
EditText masterpasscreate;
EditText repeat;
Button finish;
TextView mistake;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_masterpass);
masterpasscreate = (EditText) findViewById(R.id.masterpasscreate);
repeat = (EditText) findViewById(R.id.repeatcreate);
finish = (Button) findViewById(R.id.finish);
mistake = (TextView) findViewById(R.id.mistake);
finish.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
if(!masterpasscreate.getText().toString().equals(repeat.getText().toString())) {
mistake.setText("The passwords are different.");
mistake.setTextColor(Color.RED);
}
else if(masterpasscreate.getText().toString().equals("") || repeat.getText().toString().equals("")) {
mistake.setText("Both textfields must be filled in");
mistake.setTextColor(Color.RED);
}
else {
MainActivity.masterpass = masterpasscreate.getText().toString();
Intent myIntent = new Intent(view.getContext(), MainActivity.class);
startActivityForResult(myIntent, 0);
}
}});
}
}
LogCat error:
01-20 17:17:52.629: D/AndroidRuntime(561): Shutting down VM
01-20 17:17:52.629: W/dalvikvm(561): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
01-20 17:17:52.639: E/AndroidRuntime(561): FATAL EXCEPTION: main
01-20 17:17:52.639: E/AndroidRuntime(561): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.MainActivit y}: java.lang.NullPointerException
01-20 17:17:52.639: E/AndroidRuntime(561): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.app.ActivityThread.access$600(ActivityThread.java:122)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.os.Handler.dispatchMessage(Handler.java:99)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.os.Looper.loop(Looper.java:137)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.app.ActivityThread.main(ActivityThread.java:4340)
01-20 17:17:52.639: E/AndroidRuntime(561): at java.lang.reflect.Method.invokeNative(Native Method)
01-20 17:17:52.639: E/AndroidRuntime(561): at java.lang.reflect.Method.invoke(Method.java:511)
01-20 17:17:52.639: E/AndroidRuntime(561): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-20 17:17:52.639: E/AndroidRuntime(561): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-20 17:17:52.639: E/AndroidRuntime(561): at dalvik.system.NativeStart.main(Native Method)
01-20 17:17:52.639: E/AndroidRuntime(561): Caused by: java.lang.NullPointerException
01-20 17:17:52.639: E/AndroidRuntime(561): at de.lennartschoch.passwordmanager.MainActivity.onCreate(MainActivity.java:26)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.app.Activity.performCreate(Activity.java:4465)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
01-20 17:17:52.639: E/AndroidRuntime(561): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
01-20 17:17:52.639: E/AndroidRuntime(561): ... 11 more
01-20 17:17:57.129: I/Process(561): Sending signal. PID: 561 SIG: 9
01-20 17:21:37.499: D/AndroidRuntime(608): Shutting down VM
01-20 17:21:37.499: W/dalvikvm(608): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
01-20 17:21:37.511: E/AndroidRuntime(608): FATAL EXCEPTION: main
01-20 17:21:37.511: E/AndroidRuntime(608): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.NewMasterpass}; have you declared this activity in your AndroidManifest.xml?
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.ActivityThread.access$600(ActivityThread.java:122)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.os.Handler.dispatchMessage(Handler.java:99)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.os.Looper.loop(Looper.java:137)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.ActivityThread.main(ActivityThread.java:4340)
01-20 17:21:37.511: E/AndroidRuntime(608): at java.lang.reflect.Method.invokeNative(Native Method)
01-20 17:21:37.511: E/AndroidRuntime(608): at java.lang.reflect.Method.invoke(Method.java:511)
01-20 17:21:37.511: E/AndroidRuntime(608): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-20 17:21:37.511: E/AndroidRuntime(608): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-20 17:21:37.511: E/AndroidRuntime(608): at dalvik.system.NativeStart.main(Native Method)
01-20 17:21:37.511: E/AndroidRuntime(608): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.NewMasterpass}; have you declared this activity in your AndroidManifest.xml?
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1508)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1384)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.Activity.startActivityForResult(Activity.java:3190)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.Activity.startActivity(Activity.java:3297)
01-20 17:21:37.511: E/AndroidRuntime(608): at de.lennartschoch.passwordmanager.MainActivity.onCreate(MainActivity.java:30)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.Activity.performCreate(Activity.java:4465)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
01-20 17:21:37.511: E/AndroidRuntime(608): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
01-20 17:21:37.511: E/AndroidRuntime(608): ... 11 more
01-20 17:22:30.769: D/AndroidRuntime(655): Shutting down VM
01-20 17:22:30.769: W/dalvikvm(655): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
01-20 17:22:30.779: E/AndroidRuntime(655): FATAL EXCEPTION: main
01-20 17:22:30.779: E/AndroidRuntime(655): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.NewMasterpass}; have you declared this activity in your AndroidManifest.xml?
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.ActivityThread.access$600(ActivityThread.java:122)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.os.Handler.dispatchMessage(Handler.java:99)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.os.Looper.loop(Looper.java:137)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.ActivityThread.main(ActivityThread.java:4340)
01-20 17:22:30.779: E/AndroidRuntime(655): at java.lang.reflect.Method.invokeNative(Native Method)
01-20 17:22:30.779: E/AndroidRuntime(655): at java.lang.reflect.Method.invoke(Method.java:511)
01-20 17:22:30.779: E/AndroidRuntime(655): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-20 17:22:30.779: E/AndroidRuntime(655): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-20 17:22:30.779: E/AndroidRuntime(655): at dalvik.system.NativeStart.main(Native Method)
01-20 17:22:30.779: E/AndroidRuntime(655): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.NewMasterpass}; have you declared this activity in your AndroidManifest.xml?
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1508)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1384)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.Activity.startActivityForResult(Activity.java:3190)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.Activity.startActivity(Activity.java:3297)
01-20 17:22:30.779: E/AndroidRuntime(655): at de.lennartschoch.passwordmanager.MainActivity.onCreate(MainActivity.java:30)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.Activity.performCreate(Activity.java:4465)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
01-20 17:22:30.779: E/AndroidRuntime(655): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
01-20 17:22:30.779: E/AndroidRuntime(655): ... 11 more
01-20 17:22:33.180: I/Process(655): Sending signal. PID: 655 SIG: 9

It asks:
01-20 17:22:30.779: E/AndroidRuntime(655): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {de.lennartschoch.passwordmanager/de.lennartschoch.passwordmanager.NewMasterpass};
have you declared this activity in your AndroidManifest.xml?
Have you?

Declare the NewMasterPass activity in your manifest xml as clearly mentioned in the logcat!

Try to add this to your AndroidManifest.xml
<activity android:name="de.lennartschoch.passwordmanager.NewMasterpass" />