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Android - App crashes only on first launch but works the second time

I am having a problem with my Android Flashlight App. The app crashes when I try to press the home button of the device while the app is opened then resuming (by clicking the app icon on home screen not recent apps button). After I terminate the app from the recent apps list then opening again, it does not crash anymore using the same instructions above.
Please see code below.
public class MainActivity extends Settings {
public Camera camera;
public Camera.Parameters parameters;
public ImageButton flashLightButton;
boolean isFlashLightOn = false;
MediaPlayer mySound;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
flashLightButton = (ImageButton)findViewById(R.id.flashlight_button);
flashLightButton.setOnClickListener(new FlashOnOffListener());
registerReceiver(mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
mySound = MediaPlayer.create(this, R.raw.balloon_snap);
if (isFlashSupported()) {
camera = Camera.open();
parameters = camera.getParameters();
} else {
showNoFlashAlert();
}
Settings.active = false;
//super.onCreate(savedInstanceState);
//Set layout we created
//setContentView(R.layout.activity_main);
//Register the receiver which triggers event
//when battery charge is changed
}
public void settings(View view)
{
Intent intent = new Intent(MainActivity.this, Settings.class);
startActivity(intent);
this.finish();
}
private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
#Override
//When Event is published, onReceive method is called
public void onReceive(Context c, Intent i) {
//Get Battery %
int level = i.getIntExtra("level", 0);
//Find the progressbar creating in main.xml
ProgressBar pb = (ProgressBar) findViewById(R.id.progressbar);
//Set progress level with battery % value
pb.setProgress(level);
//Find textview control created in main.xml
TextView tv = (TextView) findViewById(R.id.textfield);
//Set TextView with text
tv.setText("" + Integer.toString(level) + "");
}
};
public class FlashOnOffListener implements View.OnClickListener{
SharedPreferences sharedPrefs = getSharedPreferences("VibrateSettings", MODE_PRIVATE);
Boolean vibration = sharedPrefs.getBoolean("VibrateSet", false);
SharedPreferences sharedPrefs2 = getSharedPreferences("SoundSettings", MODE_PRIVATE);
Boolean sound = sharedPrefs2.getBoolean("SoundSet", false);
#Override
public void onClick(View v) {
if(isFlashLightOn){
flashLightButton.setImageResource(R.drawable.flashlight_off);
parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(parameters);
camera.stopPreview();
isFlashLightOn = false;
if(vibration == true){
// Get instance of Vibrator from current Context
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 400 milliseconds
vib.vibrate(20);
}
else {
// Get instance of Vibrator from current Context
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 400 milliseconds
vib.vibrate(00);
}
if (sound == true){
mySound.start();
}
}else{
flashLightButton.setImageResource(R.drawable.flashlight_on);
parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(parameters);
camera.startPreview();
isFlashLightOn = true;
if(vibration == true){
// Get instance of Vibrator from current Context
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 400 milliseconds
vib.vibrate(20);
}
else {
// Get instance of Vibrator from current Context
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 400 milliseconds
vib.vibrate(00);
}
if (sound == true){
mySound.start();
}
}
}
}
private void showNoFlashAlert() {
new AlertDialog.Builder(this)
.setMessage("Your device hardware does not support flashlight!")
.setIcon(android.R.drawable.ic_dialog_alert).setTitle("Error")
.setPositiveButton("Ok", new OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
finish();
}
}).show();
}
private boolean isFlashSupported() {
PackageManager pm = getPackageManager();
return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
}
#Override
protected void onDestroy() {
if(camera != null){
camera.stopPreview();
camera.release();
camera = null;
}
super.onDestroy();
}}
AndroidManifest.xml
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.BATTERY_STATS"/>
<uses-permission android:name="android.permission.BROADCAST_STICKY"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<application
android:allowBackup="true"
android:icon="#drawable/btn_switch_on"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Settings"
android:label="#string/app_name">
</activity>
</application>
logcat
E/AndroidRuntime(22941): FATAL EXCEPTION: main
E/AndroidRuntime(22941): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.johncarlo.flashlight/com.example.johncarlo.flashlight.MainActivity}: java.lang.RuntimeException: Fail to connect to camera service
E/AndroidRuntime(22941): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2186)
E/AndroidRuntime(22941): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2236)
E/AndroidRuntime(22941): at android.app.ActivityThread.access$600(ActivityThread.java:145)
E/AndroidRuntime(22941): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
E/AndroidRuntime(22941): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(22941): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(22941): at android.app.ActivityThread.main(ActivityThread.java:5099)
E/AndroidRuntime(22941): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(22941): at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(22941): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:803)
E/AndroidRuntime(22941): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:570)
E/AndroidRuntime(22941): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(22941): Caused by: java.lang.RuntimeException: Fail to connect to camera service
E/AndroidRuntime(22941): at android.hardware.Camera.native_setup(Native Method)
E/AndroidRuntime(22941): at android.hardware.Camera.<init>(Camera.java:365)
E/AndroidRuntime(22941): at android.hardware.Camera.open(Camera.java:338)
E/AndroidRuntime(22941): at com.example.johncarlo.flashlight.MainActivity.onCreate(MainActivity.java:49)
E/AndroidRuntime(22941): at android.app.Activity.performCreate(Activity.java:5117)
E/AndroidRuntime(22941): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
E/AndroidRuntime(22941): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2150)
E/AndroidRuntime(22941): ... 11 more
W/ActivityManager( 786): Force finishing activity com.example.johncarlo.flashlight/.MainActivity

Remove below line from onCreate and write it in onResume and it might not crash after doing so.
#Override
protected void onResume() {
super.onResume();
registerReceiver(mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
}

setOnItemSelectedListener makes my app crash

I am trying to use a Spinner to select a user name and then open a new conversation layout when the client clicks the start chat button. I am sure that the button code is correct but my spinner cause my application crash.
myListView.setOnItemSelectedListener(new OnItemSelectedListener () {
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
// An item was selected. You can retrieve the selected item using
name1 = parent.getItemAtPosition(pos).toString();
CStart = (Button) findViewById(R.id.Start) ;
CStart.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
open(v);
}
});
}
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
}
});
The open method:
protected void open(View v) {
Intent i = new Intent(this, MainActivity2.class);
i.putExtra("message", name1);
startActivityForResult(i, 1);
}
Can you help me to fix my code?
Logcat :
03-24 19:48:32.967: E/AndroidRuntime(23058): FATAL EXCEPTION: main
03-24 19:48:32.967: E/AndroidRuntime(23058): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.javachat/com.example.javachat.MainActivity}: java.lang.IllegalArgumentException: Receiver not registered: com.example.javachat.MainActivity$1#418afa30
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2343)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.ActivityThread.access$600(ActivityThread.java:162)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.os.Handler.dispatchMessage(Handler.java:107)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.os.Looper.loop(Looper.java:194)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.ActivityThread.main(ActivityThread.java:5371)
03-24 19:48:32.967: E/AndroidRuntime(23058):at java.lang.reflect.Method.invokeNative(Native Method)
03-24 19:48:32.967: E/AndroidRuntime(23058):at java.lang.reflect.Method.invoke(Method.java:525)
03-24 19:48:32.967: E/AndroidRuntime(23058):at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833) 03-24 19:48:32.967: E/AndroidRuntime(23058):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
03-24 19:48:32.967: E/AndroidRuntime(23058):at dalvik.system.NativeStart.main(Native Method)
03-24 19:48:32.967: E/AndroidRuntime(23058): Caused by: java.lang.IllegalArgumentException: Receiver not registered: com.example.javachat.MainActivity$1#418afa30
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:657)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:1442)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:445) 03-24 19:48:32.967: E/AndroidRuntime(23058): at com.example.javachat.MainActivity.onDestroy(MainActivity.java:229)
03-24 19:48:32.967: E/AndroidRuntime(23058):at com.example.javachat.MainActivity.onCreate(MainActivity.java:136)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.Activity.performCreate(Activity.java:5122)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1084)
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
03-24 19:48:32.967: E/AndroidRuntime(23058):... 11 more
manifest code :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.javachat"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity2" />
</application>
</manifest>
my .java file if you need to check any thing else like imports and methods....
package com.example.javachat;
import java.util.Set;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final int REQUEST_ENABLE_BT = 1;
private Button onBtn;
private Button offBtn;
private Button listBtn;
private Button findBtn;
private TextView text;
private Button CStart ;
private String name1 ;
private BluetoothAdapter myBluetoothAdapter;
private Set<BluetoothDevice> pairedDevices;
private Spinner myListView;
private ArrayAdapter<String> BTArrayAdapter;
//*******************************MAIN************************
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
// take an instance of BluetoothAdapter - Bluetooth radio
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(myBluetoothAdapter == null) {
onBtn.setEnabled(false);
offBtn.setEnabled(false);
listBtn.setEnabled(false);
findBtn.setEnabled(false);
CStart.setEnabled(false);
text.setText("Status: not supported");
Toast.makeText(getApplicationContext(),"Your device does not support Bluetooth",
Toast.LENGTH_LONG).show();
} else {
text = (TextView) findViewById(R.id.text);
onBtn = (Button)findViewById(R.id.turnOn);
onBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
on(v);
}
});
offBtn = (Button)findViewById(R.id.turnOff);
offBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
off(v);
}
});
//*********************************************************
listBtn = (Button)findViewById(R.id.paired);
listBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
list(v);
}
});
//**********************************************************
myListView.setOnItemSelectedListener(new OnItemSelectedListener (){
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
// An item was selected. You can retrieve the selected item using
name1= new String (parent.getItemAtPosition(pos).toString());
CStart = (Button) findViewById(R.id.Start) ;
CStart.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
open(v);
}
});
}
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
Toast.makeText(getApplicationContext(),"Select a device" ,
Toast.LENGTH_LONG).show();
}
});
//***********************************************************
findBtn = (Button)findViewById(R.id.search);
findBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
find(v);
}
});
//***********************************************************
myListView = (Spinner)findViewById(R.id.listView1);
// create the arrayAdapter that contains the BTDevices, and set it to the ListView
BTArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
BTArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
myListView.setAdapter(BTArrayAdapter);
}
}
//**********************************METHODE***********************
protected void open(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(this ,MainActivity2.class);
// i.putExtra("message",name1);
startActivityForResult(i, 1);
}
public void on(View view){
if (!myBluetoothAdapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);
Toast.makeText(getApplicationContext(),"Bluetooth turned on" ,
Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(getApplicationContext(),"Bluetooth is already on",
Toast.LENGTH_LONG).show();
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if(requestCode == REQUEST_ENABLE_BT){
if(myBluetoothAdapter.isEnabled()) {
text.setText("Status: Enabled");
} else {
text.setText("Status: Disabled");
}
}
}
public void list(View view){
// get paired devices
pairedDevices = myBluetoothAdapter.getBondedDevices();
// put it's one to the adapter
for(BluetoothDevice device : pairedDevices)
BTArrayAdapter.add(device.getName()+ "\n" + device.getAddress());
Toast.makeText(getApplicationContext(),"Show Paired Devices",
Toast.LENGTH_SHORT).show();
}
final BroadcastReceiver bReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// add the name and the MAC address of the object to the arrayAdapter
BTArrayAdapter.add(device.getName() + "\n" + device.getAddress());
BTArrayAdapter.notifyDataSetChanged();
}
}
};
public void find(View view) {
if (myBluetoothAdapter.isDiscovering()) {
// the button is pressed when it discovers, so cancel the discovery
myBluetoothAdapter.cancelDiscovery();
}
else {
BTArrayAdapter.clear();
myBluetoothAdapter.startDiscovery();
registerReceiver(bReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
}
public void off(View view){
myBluetoothAdapter.disable();
text.setText("Status: Disconnected");
Toast.makeText(getApplicationContext(),"Bluetooth turned off",
Toast.LENGTH_LONG).show();
}
#Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(bReceiver);
}
}

Exception clearly states the following:
Receiver not registered: com.example.javachat.MainActivity$1#418afa30
Crash happens here:
03-24 19:48:32.967: E/AndroidRuntime(23058):at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:445)
03-24 19:48:32.967: E/AndroidRuntime(23058): at com.example.javachat.MainActivity.onDestroy(MainActivity.java:229)
03-24 19:48:32.967: E/AndroidRuntime(23058):at com.example.javachat.MainActivity.onCreate(MainActivity.java:136)
You have unregisterReceiver at the onDestroy, but you have no place, where you are registering it. Also you would like to take a look here, because onItemSelected will be called for Spinner without user action.
But it is not the end. The BroadcastReceiver declaration is wrong. Since you are using broadcast receiver locally, binding it to the Activity lifecycle, you should use LocalBroadcastManager, to register/unregister at the onCreate/onDestroy (or other lifecycle callbacks, depends on your needs). Thus, the following declaration in manifest makes no sense:
<receiver android:name=".bReceiver">
</receiver>
Because you have no class called bReceiver, you have a local variable (which should be actually made a class member) bReceiver, which points to an instance of BroadcastReceiver class.

if clicking on the Button is causing your crash, then the reason is -
you have set a method local anonymous inner class object as listener in your onItemSlected(). that object will be destroyed when the method execution is finished.
So when the onItemSelected is finished, your listener object is set properly. but by the time when button is being clicked, that saved listener object is invoked which is actually cleared by garbage collector.
you shouldn't set the listener this way. you can easily set the listener outside of your item click listener if I did understand your requirement correctly.

Run Backgroung thread , when activity is created

I am new to Android Programming. I am making an App which requires "OnlineMode" as well as "OfflineMode". I researched a lot about the topic and first step is to check for internet connectivity continously. Just like big apps like "WhatsApp" "Hike" etc use. Now I tried to create a thread which will run in background , it got created but not being able to produce the output the results. I have tried various methods. Here's what i want
1. A thread should run continuously on the background throughout the app checking the network connectivity.
2. Thread should be created as soon as user opens up the app
Below is my MainActivity.java file
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
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.widget.Button;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity{
// flag for Internet connection status
Boolean isInternetPresent = false;
// Connection detector class
ConnectionDetector cd;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
runInBackground();
Button btnStatus = (Button) findViewById(R.id.btn_check);
btnStatus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Button Clicked.", Toast.LENGTH_LONG).show();
}
});
}
void runInBackground() {
new Thread(new Runnable() {
#Override
public void run() {
ConnectivityManager cm =
(ConnectivityManager)getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
if (!isConnected) {
runOnUiThread(new Runnable() {
#Override
public void run() {
Thread t1 = new Thread(this);
t1.start();
Toast.makeText(MainActivity.this, "You are online.", Toast.LENGTH_LONG).show();
runInBackground();
}
});
} else{
Toast.makeText(MainActivity.this, "You have gone offline.", Toast.LENGTH_LONG).show();
try {
Thread.sleep(6000);
} catch (InterruptedException e) {
e.printStackTrace();
}
runInBackground();
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
Edit:
Here is my final code and i am getting errors
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.xyz.broadcastreciever" >
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".NetworkChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
</intent-filter>
</receiver>
<!-- Internet Permissions -->
<uses-permission android:name="android.permission.INTERNET" />
<!-- Network State Permissions -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
</application>
</manifest>
MainActivity.java
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent();
NetworkChangeReceiver network = new NetworkChangeReceiver();
network.onReceive(this,intent);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
NetworkChangeReceiver.java
public class NetworkChangeReceiver extends BroadcastReceiver {
#Override
public void onReceive(final Context context, final Intent intent) {
final ConnectivityManager connMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
final android.net.NetworkInfo wifi = connMgr
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
final android.net.NetworkInfo mobile = connMgr
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (wifi.isAvailable() || mobile.isAvailable()) {
Log.d("Netowk Available ", "Flag No 1");
}
}
}
And Here is my Logs showing errors:
02-19 12:10:21.321 30369-30369/com.aubergine.broadcastreciever E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.aubergine.broadcastreciever/com.aubergine.broadcastreciever.MainActivity}: java.lang.SecurityException: ConnectivityService: Neither user 10208 nor current process has android.permission.ACCESS_NETWORK_STATE.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2299)
at android.app.ActivityThread.access$700(ActivityThread.java:150)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5283)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10208 nor current process has android.permission.ACCESS_NETWORK_STATE.
at android.os.Parcel.readException(Parcel.java:1425)
at android.os.Parcel.readException(Parcel.java:1379)
at android.net.IConnectivityManager$Stub$Proxy.getNetworkInfo(IConnectivityManager.java:1123)
at android.net.ConnectivityManager.getNetworkInfo(ConnectivityManager.java:636)
at com.aubergine.broadcastreciever.NetworkChangeReceiver.onReceive(NetworkChangeReceiver.java:19)
at com.aubergine.broadcastreciever.MainActivity.onCreate(MainActivity.java:22)
at android.app.Activity.performCreate(Activity.java:5283)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2299)
            at android.app.ActivityThread.access$700(ActivityThread.java:150)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5283)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
            at dalvik.system.NativeStart.main(Native Method)

To check the internet connectivity you should not start a new thread instead of this follow these steps:
As soon as you enter the app check for internet connectivity.
Add a BroadCastREceiver that keeps on listening to network on/off i.e state change updates for that add a IntentFilter <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
Now whenever you are connected or disconnected to the internet you will receive a update in onReceive of your BroadcastReceiver.
This is the receiver in manifest
<receiver android:name=".NetworkChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
This is the java class of receiver:
public class NetworkChangeReceiver extends BroadcastReceiver {
#Override
public void onReceive(final Context context, final Intent intent) {
final ConnectivityManager connMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
final android.net.NetworkInfo wifi = connMgr
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
final android.net.NetworkInfo mobile = connMgr
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (wifi.isAvailable() || mobile.isAvailable()) {
// Do something
Log.d("Netowk Available ", "Flag No 1");
}
}
}
If you are stuck in any of above step please comment.

Unable to instantiate application java.lang.RuntimeException:...BackupDB cannot be cast to android.app.Application

MANIFEST:(partial view)
MainActivity, program immediately terminates and issues the messages in the Log.
It should have started showing the buttons to select options to continue execution.
After days of researching this forum, I found postings that suggest to place the BackupDb inside the application in the Manifest.
After doing that, I ended up with the message in the log.
Having exhausted my research venues, I'd like to know what could be the problem and how to solve it.
MANIFEST:(partial view)
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.peter.databasetest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<supports-screens
android:xlargeScreens="true"
android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="false"
/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme"
**android:name="com.peter.databasetest.BackupDB">**
<activity
android:name="com.peter.databasetest.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".CheckDatabase"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.CHECKDATABASE" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".CheckSDcard"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.CHECKSDCARD" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.peter.databasetest.Insert"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.peter.databasetest.INSERT" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity: Calls checkSDcard and CheckDatabase. Checks if there is SDCard present and the database in main, exists.
public class MainActivity extends Activity implements OnClickListener {
DBAdapter db;
Button insertButton; //ADD A NEW RECORD
Button listAllButton; //LIST ALL
Button cancelButton; //CANCEL PGM
Button backupDbButton; //REQUEST BACKUP DB TO SDCARD
Button restoreButton; //RESTORE DB FROM SDCARD TO MAIN
Button memsizeButton; //SHOW MEMORY SIZES ON DEVICE
int retcode;
int chk;
String message;
public Context context;
public static final String NO_DB ="Database does not exist. Backup is not possible";
public static final String DB_PB ="ERROR- Check log";
public static final String UNWR_SDCARD ="Your SDCard must be set to writable. Check the card lock";
public static final String NO_SDCARD ="No SDcard detected. No backup is possible";
public static final String BKP_OK = "Backup was SUCCESSFUL.";
public static final String BKP_NOK = "Backup FAILED. ";
static final int SD_CHECK = 1;
static final int DB_CHECK = 2;
static final int BK_CHECK = 3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
insertButton = (Button) findViewById(R.id.insertButton);
listAllButton = (Button) findViewById(R.id.listAllButton);
cancelButton = (Button) findViewById(R.id.cancelButton);
backupDbButton = (Button) findViewById(R.id.backupDbButton);
restoreButton = (Button) findViewById(R.id.restoreButton);
memsizeButton = (Button) findViewById(R.id. memsizeButton);
insertButton.setOnClickListener(this); //insert record into DB
listAllButton.setOnClickListener(this); //list ALL records from DB
cancelButton.setOnClickListener(this); //cancel the program
backupDbButton.setOnClickListener(this); //request backup to sdcard
restoreButton.setOnClickListener(this); //request restore from sdcard
memsizeButton.setOnClickListener(this); //Get Meory sizes
public void onClick(View v ) {
if (v == insertButton) {
startActivity(new Intent(getApplicationContext(), Insert.class));
}else if (v == listAllButton){
startActivity (new Intent(MainActivity.this, ListDr.class));
}else if (v == backupDbButton){
**Intent checksd = new Intent(this,CheckSDcard.class);**
**startActivityForResult(checksd, SD_CHECK);**
}else if (v == restoreButton) {
startActivity (new Intent(MainActivity.this,RestoreDB.class));
}else if (v == memsizeButton) {
startActivity (new Intent(MainActivity.this,GetMemorySizes.class));
}else if (v == cancelButton){
finish();
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SD_CHECK && resultCode == RESULT_OK) {
Intent checkdb = new Intent(MainActivity.this,CheckDatabase.class);
startActivityForResult(checkdb, DB_CHECK);
}else if (requestCode == DB_CHECK && resultCode == RESULT_OK){
**Intent backup = new Intent(MainActivity.this,BackupDB.class);**
**startActivityForResult(backup, BK_CHECK);**
}else if (requestCode == BK_CHECK && resultCode == RESULT_OK){
message = BKP_OK;
SendMessageDialog(message);
finish();
}
if(resultCode == RESULT_CANCELED && resultCode == -1){
message = NO_DB;
SendMessageDialog(message);
finish();
}else if(resultCode == RESULT_CANCELED && resultCode == -2) {
message = DB_PB;
SendMessageDialog(message);
finish();
}
}
BackupDb: Copies the database to the SDCARD.
package com.peter.databasetest;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import com.peter.databasetest.DBAdapter;
public class BackupDB extends AsyncTask<Void, Void, Integer> {
DBAdapter db;
intrc= -10;
intretcode;
intchk;
Stringmessage;
String mypackage;
public Context context;
public static String FOLDER_NAME = "DBfolder";
public static final String DATABASE_NAME = "UserDB.db";
public static final String DATABASE_BACKUP= "UserDB.db";
public static final String BKP_OK = "Backup was SUCCESSFUL.";
public static final String BKP_NOK = "Backup FAILED. ";
#Override
protected void onPreExecute() {
// GET PACKAGE NAME
mypackage = context.getApplicationContext().getPackageName() ;
}
// START BACKUP TO SDCARD
#Override
protected Integer doInBackground(Void... params) {
// DOING BACKUP
Log.i("00000" , "STARTING BACKUP...BACKUP ");
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
CREATE A FOLDER /mnt/sdcard<packagename>FOLDER_NAME if it does not exist
File folder = new File(Environment.getExternalStorageDirectory()
+ "/"
+ mypackage
+ "/"
+ FOLDER_NAME);
if(!folder.exists()) {
if (folder.mkdirs()) ;
}
// GET THE PATH OF THE BACKUP ON THE SDCARD
FilefileBackupDir = new File(Environment.getExternalStorageDirectory()
+ "/"
+mypackage
+ "/"
+ FOLDER_NAME
+"/"
+ DATABASE_BACKUP) ;
// IF WE HAVE A BACKUP ON SDCARD, DELETE IT TO MAKE ROOM FOR THE NEW BACKUP
if (fileBackupDir.exists()) {
fileBackupDir.delete();
}else {
* DO NOTHING */
}
// GET CURRENT DB PATH FOR THE COPY
String currentDBPath = "/data/" + mypackage + "/databases/"+ DATABASE_NAME;
// GET CURRENT DB PATH FOR THE BACKUP
String backupDBPath = "/" + mypackage + "/" +FOLDER_NAME + "/" + DATABASE_BACKUP;
FilecurrDB = new File(data, currentDBPath) ;
FilebkpDB = new File(sd, backupDBPath);
FileChannel from = null;
try {
from = new FileInputStream(currDB).getChannel();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
FileChannel to = null;
try {
to = new FileOutputStream(bkpDB).getChannel();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
to.transferFrom(from, 0, from.size());
} catch (IOException e) {
e.printStackTrace();
}
try {
from.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
to.close();
} catch (IOException e) {
e.printStackTrace();
}
retcode = 0;
returnretcode;
// end DoInBackgroung
protectedvoid onPostExecute(Integer retcode, String message) {
if(retcode == 0) {
message = BKP_OK;
SendMessageDialog(message);
}else {
message = BKP_NOK;
SendMessageDialog(message);
}
}
public void SendMessageDialog(String message) {
if (message == BKP_OK ) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("My Database")
.setMessage(message) // Title of the dialog
.setCancelable(true) // Does allow the use of Back Button on the hardware
.setIcon(R.drawable.ecg)// da picture
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.dismiss();
dialog.cancel();
}
});
final AlertDialog alert = builder.create();
alert.show();
}else {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("My Database")
.setMessage(message) // Title of the dialog
.setCancelable(true) // Does allow the use of Back Button on the hardware
.setIcon(R.drawable.bad)// da picture
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.dismiss();
dialog.cancel();
}
});
final AlertDialog alert = builder.create();
alert.show();
}
}
}
Logcat:
02-12 07:36:06.015: E/AndroidRuntime(987): FATAL EXCEPTION: main
02-12 07:36:06.015: E/AndroidRuntime(987): java.lang.RuntimeException: Unable to instantiate application com.peter.databasetest.BackupDB:
: com.peter.databasetest.BackupDB cannot be cast to android.app.Application
02-12 07:36:06.015: E/AndroidRuntime(987): at android.app.LoadedApk.makeApplication(LoadedApk.java:501)
02-12 07:36:06.015: E/AndroidRuntime(987): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4124)
02-12 07:36:06.015: E/AndroidRuntime(987): at android.app.ActivityThread.access$1300(ActivityThread.java:130)
02-12 07:36:06.015: E/AndroidRuntime(987): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1255)
02-12 07:36:06.015: E/AndroidRuntime(987): at android.os.Handler.dispatchMessage(Handler.java:99)
02-12 07:36:06.015: E/AndroidRuntime(987): at android.os.Looper.loop(Looper.java:137)
02-12 07:36:06.015: E/AndroidRuntime(987): at android.app.ActivityThread.main(ActivityThread.java:4745)
02-12 07:36:06.015: E/AndroidRuntime(987): at java.lang.reflect.Method.invokeNative(Native Method)
02-12 07:36:06.015: E/AndroidRuntime(987): at java.lang.reflect.Method.invoke(Method.java:511)
02-12 07:36:06.015: E/AndroidRuntime(987): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
02-12 07:36:06.015: E/AndroidRuntime(987): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-12 07:36:06.015: E/AndroidRuntime(987): at dalvik.system.NativeStart.main(Native Method)
02-12 07:36:06.015: E/AndroidRuntime(987): Caused by: java.lang.ClassCastException: com.peter.databasetest.BackupDB cannot be cast to android.app.Application
02-12 07:36:06.015: E/AndroidRuntime(987): at android.app.Instrumentation.newApplication(Instrumentation.java:982)
02-12 07:36:06.015: E/AndroidRuntime(987): at android.app.Instrumentation.newApplication(Instrumentation.java:967)
02-12 07:36:06.015: E/AndroidRuntime(987): at android.app.LoadedApk.makeApplication(LoadedApk.java:496)
02-12 07:36:06.015: E/AndroidRuntime(987): ... 11 more
Comment:
I removed the BackupDb from the application and reinstated it as activity.
<activity
android:name=".BackupDB"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.peter.databasetest.BACKUPDB" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
The program now brings up the buttons as expected, but when trying the backup I still get the same message as in the earlier log. (Catch-22?)
Most current log:
02-12 13:00:16.569: W/dalvikvm(30656): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
02-12 13:00:16.650: E/AndroidRuntime(30656): FATAL EXCEPTION: main
02-12 13:00:16.650: E/AndroidRuntime(30656): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.peter.databasetest/com.peter.databasetest.BackupDB}: java.lang.ClassCastException: com.peter.databasetest.BackupDB cannot be cast to android.app.Activity
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.app.ActivityThread.access$600(ActivityThread.java:130)
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.os.Handler.dispatchMessage(Handler.java:99)
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.os.Looper.loop(Looper.java:137)
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.app.ActivityThread.main(ActivityThread.java:4745)
02-12 13:00:16.650: E/AndroidRuntime(30656): at java.lang.reflect.Method.invokeNative(Native Method)
02-12 13:00:16.650: E/AndroidRuntime(30656): at java.lang.reflect.Method.invoke(Method.java:511)
02-12 13:00:16.650: E/AndroidRuntime(30656): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
02-12 13:00:16.650: E/AndroidRuntime(30656): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-12 13:00:16.650: E/AndroidRuntime(30656): at dalvik.system.NativeStart.main(Native Method)
02-12 13:00:16.650: E/AndroidRuntime(30656): Caused by: java.lang.ClassCastException: com.peter.databasetest.BackupDB cannot be cast to android.app.Activity
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
02-12 13:00:16.650: E/AndroidRuntime(30656): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
02-12 13:00:16.650: E/AndroidRuntime(30656): ... 11 more
>Question:
>Is there any known limitation calling an AsyncTask by way of startActivityForResult?
>Could this be a factor?

The problem is in the Manifest file, you are setting your application:name to be te BackupDB class and this class is only an AsyncTask not an Application.
As can be seen on the explanation of "android:name":
An optional name of a class implementing the overall
android.app.Application for this package. [string]

How to pass get text from userinput (edittext) and put into a textview in another activity?

I would like to take user input entered in the EditTextField(in the EnterNewFile class) and put it into the TextField (in the NoteEdit class). Please help! Thanks! FYI- I use XML files for the layouts of these two classes.
***********EnterNewFile.class*********
package com.example.note;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class EnterNewFile extends Activity {
public EditText mText;
public Button mButton;
public final static String EXTRA_MESSAGE = "com.example.note.MESSAGE";
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.new_file_start);
mText = (EditText)findViewById(R.id.file_name_edittext);
mButton = (Button)findViewById(R.id.next_button);
}
public void nextButton(View view)
{
/** Called when the user clicks the Next button */
Log.d("EditText", mText.getText().toString());
mText.getText().toString();
Intent intent = new Intent(this, NoteEdit.class);
EditText editText = (EditText) findViewById(R.id.file_name_edittext);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
//
}
}
******************************************
********NoteEdit.class************
package com.example.note;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class NoteEdit extends Activity{
public static int numTitle = 1;
public static String curDate = "";
public static String curText = "";
private TextView mTitleText;
private EditText mBodyText;
private TextView mDateText;
private Long mRowId;
private Cursor note;
private NotesDbAdapter mDbHelper;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new NotesDbAdapter(this);
mDbHelper.open();
setContentView(R.layout.note_edit_add);
setTitle(R.string.app_name);
mTitleText = (TextView) findViewById(R.id.title);
mBodyText = (EditText) findViewById(R.id.body);
mDateText = (TextView) findViewById(R.id.notelist_date);
long msTime = System.currentTimeMillis();
Date curDateTime = new Date(msTime);
SimpleDateFormat formatter = new SimpleDateFormat("M'/'d'/'y");
curDate = formatter.format(curDateTime);
mDateText.setText(""+curDate);
// Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(EnterNewFile.EXTRA_MESSAGE);
// Create the text view
// TextView textView = new TextView(this);
mTitleText.setText(message);
// Set the text view as the activity layout
// setContentView(textView);
// mTitleText.setText(dana);
mRowId = (savedInstanceState == null) ? null :
(Long) savedInstanceState.getSerializable(NotesDbAdapter.KEY_ROWID);
if (mRowId == null) {
Bundle extras = getIntent().getExtras();
mRowId = extras != null ? extras.getLong(NotesDbAdapter.KEY_ROWID)
: null;
}
populateFields();
}
public void addFiles(View view)
{
/*Intent addFilesTarget = new Intent(this, Welcome.class);
startActivity(addFilesTarget);*/
}
public static class LineEditText extends EditText{
// we need this constructor for LayoutInflater
public LineEditText(Context context, AttributeSet attrs) {
super(context, attrs);
mRect = new Rect();
mPaint = new Paint();
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setColor(Color.BLUE);
}
private Rect mRect;
private Paint mPaint;
#Override
protected void onDraw(Canvas canvas) {
int height = getHeight();
int line_height = getLineHeight();
int count = height / line_height;
if (getLineCount() > count)
count = getLineCount();
Rect r = mRect;
Paint paint = mPaint;
int baseline = getLineBounds(0, r);
for (int i = 0; i < count; i++) {
canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint);
baseline += getLineHeight();
super.onDraw(canvas);
}
}
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
saveState();
outState.putSerializable(NotesDbAdapter.KEY_ROWID, mRowId);
}
#Override
protected void onPause() {
super.onPause();
saveState();
}
#Override
protected void onResume() {
super.onResume();
populateFields();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.noteedit_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_about:
/* Here is the intro about myself */
AlertDialog.Builder dialog = new AlertDialog.Builder(NoteEdit.this);
dialog.setTitle("About");
dialog.setMessage("Hello! I'm Dana, creator of this application. This is for documenting research."
+"\n melaninabeauty#gmail.com");
dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
dialog.show();
return true;
case R.id.menu_delete:
if(note != null){
note.close();
note = null;
}
if(mRowId != null){
mDbHelper.deleteNote(mRowId);
}
finish();
return true;
case R.id.menu_save:
saveState();
finish();
default:
return super.onOptionsItemSelected(item);
}
}
private void saveState() {
String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString();
if(mRowId == null){
mDbHelper.createNote(title, body, curDate);
}else{
mDbHelper.updateNote(mRowId, title, body, curDate);
}
}
private void populateFields() {
if (mRowId != null) {
note = mDbHelper.fetchNote(mRowId);
startManagingCursor(note);
mTitleText.setText(note.getString(
note.getColumnIndexOrThrow(NotesDbAdapter.KEY_TITLE)));
mBodyText.setText(note.getString(
note.getColumnIndexOrThrow(NotesDbAdapter.KEY_BODY)));
curText = note.getString(
note.getColumnIndexOrThrow(NotesDbAdapter.KEY_BODY));
}
}
}
***********************************
****AndroidManifest.xml****
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.note"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.note.Welcome"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.note.NoteList">
</activity>
<activity
android:name="com.example.note.NoteEdit">
</activity>
<activity
android:name="com.example.note.Export">
</activity>
<activity
android:name="com.example.note.NoteEditAdd">
</activity>
<activity
android:name="com.example.note.EnterNewFile">
</activity>
</application>
</manifest>
<!--
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.note"
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="com.example.note.Welcome">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.note.NoteList"
android:label="#string/app_name" >
</activity>
<activity
android:name="com.example.note.NoteEdit"
android:label="#string/edit_note"
android:parentActivityName="com.example.note.Welcome" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.note.Welcome" />
</activity>
</application>
</manifest>
-->
<!--
activity 2 android:name= com.example.note.NoteEdit
android:label=#string/app_name
android:windowSoftInputMode="djustUnspecified/>
-->
*****************************
> *****LogCat of crash**** Crash occurs after nextButton is clicked****(I inputted the text "nouy", clicked nextButton, then application crashes.********************
LogCat of crash** Crash occurs after nextButton is clicked*(I inputted the text "nouy", clicked nextButton, then application crashees.**
08-02 20:48:36.703: D/EditText(3575): nouy
08-02 20:48:36.793: I/Choreographer(3575): Skipped 68 frames! The application may be doing too much work on its main thread.
08-02 20:48:37.143: D/dalvikvm(3575): GC_CONCURRENT freed 1331K, 34% free 2956K/4428K, paused 4ms+59ms, total 137ms
08-02 20:48:37.353: D/AndroidRuntime(3575): Shutting down VM
08-02 20:48:37.394: W/dalvikvm(3575): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
08-02 20:48:37.443: E/AndroidRuntime(3575): FATAL EXCEPTION: main
08-02 20:48:37.443: E/AndroidRuntime(3575): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.note/com.example.note.NoteEdit}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.os.Looper.loop(Looper.java:137)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.app.ActivityThread.main(ActivityThread.java:5041)
08-02 20:48:37.443: E/AndroidRuntime(3575): at java.lang.reflect.Method.invokeNative(Native Method)
08-02 20:48:37.443: E/AndroidRuntime(3575): at java.lang.reflect.Method.invoke(Method.java:511)
08-02 20:48:37.443: E/AndroidRuntime(3575): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-02 20:48:37.443: E/AndroidRuntime(3575): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-02 20:48:37.443: E/AndroidRuntime(3575): at dalvik.system.NativeStart.main(Native Method)
08-02 20:48:37.443: E/AndroidRuntime(3575): Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:424)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
08-02 20:48:37.443: E/AndroidRuntime(3575): at com.example.note.NoteEdit.populateFields(NoteEdit.java:231)
08-02 20:48:37.443: E/AndroidRuntime(3575): at com.example.note.NoteEdit.onCreate(NoteEdit.java:99)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.app.Activity.performCreate(Activity.java:5104)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
08-02 20:48:37.443: E/AndroidRuntime(3575): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
08-02 20:48:37.443: E/AndroidRuntime(3575): ... 11 more
08-02 20:48:40.073: E/Trace(3598): error opening trace file: No such file or directory
(2)

Take the input from Edittext send it through the Intent to your destination activity and then set it in the TextView there.
I think you seem to already be doing that in your code:
The issue might be the you've not defined in your XML that nextButton function should be call on click ( inside android:onClick: inside your Button).
What you can also do is, in your onCreate funcion set up a listener which listens to the button click and call the intent from within it.
final EditText editText = (EditText) findViewById(R.id.file_name_edittext);
mButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
/** Called when the user clicks the Next button */
Log.d("EditText", mText.getText().toString());
Intent intent = new Intent(EnterNewFile.this, NoteEdit.class);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
});
//here you are taking value from EditText and send it to other activity:
Instead of
// Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(EnterNewFile.EXTRA_MESSAGE);
use following in onCreate() of your other NoteEdit activity:
Intent intent = getIntent();
if((intent.getExtras()!=null) && !intent.getExtras().isEmpty()){
String message = intent.getExtras().getString(EnterNewFile.EXTRA_MESSAGE);
}

this code is working:-
scrollview=(ScrollView)findViewById(R.id.scrollview1);
tb2.setTextSize(30);
tb2.setMovementMethod(new ScrollingMovementMethod());
scrollview.post(new Runnable() {
public void run() {
scrollview.fullScroll(View.FOCUS_DOWN);
}
});
chat1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
{
textsaring1=edt1.getText().toString();
tb2.setText(tb2.getText()+" "+textsaring1);
edt1.setText("");
}
}
});