I am building a complex application however I am having an isolated problem. My Android application class UserPage.java should be able to fetch a String from a webpage and then pass that over to the layout and display it accordingly.
UserPage.java
package com.example.ams;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
public class UserPage extends Activity {
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
ProgressDialog dialog = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.userpage);
String json = getStudents();
//System.out.println(json);
TextView datazer = (TextView) findViewById(R.id.data);
datazer.setText(json);
}
public String getStudents(){
HttpResponse response = null;
//String classID = "CSD2334";
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI("http://localhost:8080/de.vogella.jersey.first/resources/hello/ids/CSD2334"));
response = client.execute(request);
System.out.println(response.toString());
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return response.toString();
}
}
The layout - userpage.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="#+id/data"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
The content fetched from the web
[{"student_id":3,"student_name":"Dite Gashi","w1mo":"1","w1tue":"0","w1wed":0,"w1thu":0,"w1fri":1},{"student_id":4,"student_name":"Vullnet Dyla","w1mo":"2","w1tue":"2","w1wed":1,"w1thu":0,"w1fri":0},{"student_id":5,"student_name":"Edon Ymeri","w1mo":"0","w1tue":"0","w1wed":0,"w1thu":0,"w1fri":2},{"student_id":6,"student_name":"Ilir Kelmendi","w1mo":"2","w1tue":"0","w1wed":2,"w1thu":0,"w1fri":0}]
The error I am getting is quite generic and I can't seem to find information anywhere
03-30 17:36:15.074: E/AndroidRuntime(1458): FATAL EXCEPTION: main
03-30 17:36:15.074: E/AndroidRuntime(1458): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.ams/com.example.ams.UserPage}: android.os.NetworkOnMainThreadException
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.app.ActivityThread.access$600(ActivityThread.java:123)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.os.Handler.dispatchMessage(Handler.java:99)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.os.Looper.loop(Looper.java:137)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.app.ActivityThread.main(ActivityThread.java:4424)
03-30 17:36:15.074: E/AndroidRuntime(1458): at java.lang.reflect.Method.invokeNative(Native Method)
03-30 17:36:15.074: E/AndroidRuntime(1458): at java.lang.reflect.Method.invoke(Method.java:511)
03-30 17:36:15.074: E/AndroidRuntime(1458): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-30 17:36:15.074: E/AndroidRuntime(1458): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-30 17:36:15.074: E/AndroidRuntime(1458): at dalvik.system.NativeStart.main(Native Method)
03-30 17:36:15.074: E/AndroidRuntime(1458): Caused by: android.os.NetworkOnMainThreadException
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
03-30 17:36:15.074: E/AndroidRuntime(1458): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
03-30 17:36:15.074: E/AndroidRuntime(1458): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
03-30 17:36:15.074: E/AndroidRuntime(1458): at java.net.InetAddress.getAllByName(InetAddress.java:220)
03-30 17:36:15.074: E/AndroidRuntime(1458): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
03-30 17:36:15.074: E/AndroidRuntime(1458): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
03-30 17:36:15.074: E/AndroidRuntime(1458): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
03-30 17:36:15.074: E/AndroidRuntime(1458): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
03-30 17:36:15.074: E/AndroidRuntime(1458): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
03-30 17:36:15.074: E/AndroidRuntime(1458): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
03-30 17:36:15.074: E/AndroidRuntime(1458): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
03-30 17:36:15.074: E/AndroidRuntime(1458): at com.example.ams.UserPage.getStudents(UserPage.java:44)
03-30 17:36:15.074: E/AndroidRuntime(1458): at com.example.ams.UserPage.onCreate(UserPage.java:31)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.app.Activity.performCreate(Activity.java:4465)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
03-30 17:36:15.074: E/AndroidRuntime(1458): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
03-30 17:36:15.074: E/AndroidRuntime(1458): ... 11 more
03-30 17:36:15.363: I/dalvikvm(1458): threadid=3: reacting to signal 3
03-30 17:36:15.434: I/dalvikvm(1458): Wrote stack traces to '/data/anr/traces.txt'
03-30 17:36:15.814: I/dalvikvm(1458): threadid=3: reacting to signal 3
03-30 17:36:15.834: I/dalvikvm(1458): Wrote stack traces to '/data/anr/traces.txt'
Any help or pointers would be highly appreciated,
D
You are running a http call on the main thread and that causes the error.
response = client.execute(request);
The above code should run on a new Thread.
Your should have something like:
new Thread( new Runnable() {
#Override
public void run() {
HttpResponse response = null;
//String classID = "CSD2334";
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI("http://localhost:8080/de.vogella.jersey.first/resources/hello/ids/CSD2334"));
response = client.execute(request);
System.out.println(response.toString());
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return response.toString();
}
}).start();
And if you want to make updates to a UI component you should run the code into:
runOnUiThread(new Runnable() {
#Override
public void run() {
// runs on the UI thread so update UI here
}
});
You should read more about threads on android
Your current code runs, as mentioned, on the uiThread. Consider using either an asynctask or a class which extends Thread. There is a lot of questions regarding this, by doing a quick Google search, so I feel that an example would be too much.
Related
everything is mainly explained in the title ill go in as much detail as i can. I am making an android game app i created a unique id for a circle that is drawn in canvas in the DrawingView class since this cannot be referenced in xml i had to create the id as an int in java so that java could find the id and use it as the button. Im sure you are all very confused by now i will continue will putting in my best effort to explain. below is the code for the Main file that gets called
public class Main extends Activity {
DrawingView v;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
LinearLayout layout1 = new LinearLayout (this);
FrameLayout game = new FrameLayout(this);
DrawingView v = new DrawingView (this);
TextView myText = new TextView(this);
int w = getResources().getInteger(DrawingView.redColor);
Button redCircle = (Button) findViewById(w);
redCircle.setWidth(300);
redCircle.setText("Start Game");
layout1.addView(myText);
layout1.addView(redCircle);
//redCircle.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
game.addView(v);
game.addView(layout1);
setContentView(game);
redCircle.setOnClickListener((OnClickListener) this);
}
public void onClick(View v) {
Intent intent = new Intent(this, Main.class);
startActivity(intent);
// re-starts this activity from game-view. add this.finish(); to remove from stack
}
#Override
public boolean onCreateOptionsMenu(Menu menu){
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
and not really neccessary but to help you understand what i am trying to accomplish here is the DrawingView class that creates random circles either green or red below.
public class DrawingView extends View {
public DrawingView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
RectF rectf = new RectF(0, 0, 200, 0);
private static final int w = 100;
public static int lastColor = Color.BLACK;
private final Random random = new Random();
private final Paint paint = new Paint();
private final int radius = 230;
private final Handler handler = new Handler();
public static int redColor = Color.RED;
public static int greenColor = Color.GREEN;
private final Runnable updateCircle = new Runnable() {
#Override
public void run() {
lastColor = random.nextInt(2) == 1 ? redColor : greenColor;
paint.setColor(lastColor);
invalidate();
handler.postDelayed(this, 1000);
}
};
#Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
handler.post(updateCircle);
}
#Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
handler.removeCallbacks(updateCircle);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// your other stuff here
canvas.drawCircle(random.nextInt(canvas.getWidth()-radius/2) + radius/2f, random.nextInt(canvas.getHeight()-radius/2) + radius/2f, radius, paint);
}
//Bitmap.Config conf = Bitmap.Config.ARGB_8888; // see other conf types
//private int h = 100;
//#SuppressLint("DrawAllocation")
//Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
//Canvas canvas = new Canvas(bmp);
/*
private Object canvas(Bitmap bmp) {
// TODO Auto-generated method stub
return null;
}
*/
}
and more importantly the log cat errors that display after the app crashes
03-30 02:27:27.903: E/AndroidRuntime(3104): FATAL EXCEPTION: main
03-30 02:27:27.903: E/AndroidRuntime(3104): Process: com.Tripps.thesimplegame, PID: 3104
03-30 02:27:27.903: E/AndroidRuntime(3104): java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
03-30 02:27:27.903: E/AndroidRuntime(3104): at com.Tripps.thesimplegame.DrawingView.onDraw(DrawingView.java:67)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.draw(View.java:15114)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.updateDisplayListIfDirty(View.java:14048)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.getDisplayList(View.java:14071)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.draw(View.java:14838)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.updateDisplayListIfDirty(View.java:14043)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.getDisplayList(View.java:14071)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.draw(View.java:14838)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.updateDisplayListIfDirty(View.java:14043)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.getDisplayList(View.java:14071)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.draw(View.java:14838)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.updateDisplayListIfDirty(View.java:14043)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.getDisplayList(View.java:14071)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.draw(View.java:14838)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.draw(View.java:15117)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.widget.FrameLayout.draw(FrameLayout.java:592)
03-30 02:27:27.903: E/AndroidRuntime(3104): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2595)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.updateDisplayListIfDirty(View.java:14048)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.View.getDisplayList(View.java:14071)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:266)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:272)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:311)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewRootImpl.draw(ViewRootImpl.java:2492)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2337)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1968)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.Choreographer.doCallbacks(Choreographer.java:580)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.Choreographer.doFrame(Choreographer.java:550)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.os.Handler.handleCallback(Handler.java:739)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.os.Handler.dispatchMessage(Handler.java:95)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.os.Looper.loop(Looper.java:135)
03-30 02:27:27.903: E/AndroidRuntime(3104): at android.app.ActivityThread.main(ActivityThread.java:5221)
03-30 02:27:27.903: E/AndroidRuntime(3104): at java.lang.reflect.Method.invoke(Native Method)
03-30 02:27:27.903: E/AndroidRuntime(3104): at java.lang.reflect.Method.invoke(Method.java:372)
03-30 02:27:27.903: E/AndroidRuntime(3104): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-30 02:27:27.903: E/AndroidRuntime(3104): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-30 02:38:46.269: D/OpenGLRenderer(3167): Render dirty regions requested: true
03-30 02:38:46.276: D/(3167): HostConnection::get() New Host Connection established 0xae0add60, tid 3167
03-30 02:38:46.287: D/Atlas(3167): Validating map...
03-30 02:38:46.379: D/(3167): HostConnection::get() New Host Connection established 0xa6c52140, tid 3182
03-30 02:38:46.427: I/OpenGLRenderer(3167): Initialized EGL, version 1.4
03-30 02:38:46.473: D/OpenGLRenderer(3167): Enabling debug mode 0
03-30 02:38:46.550: W/EGL_emulation(3167): eglSurfaceAttrib not implemented
03-30 02:38:46.550: W/OpenGLRenderer(3167): Failed to set EGL_SWAP_BEHAVIOR on surface 0xae0ed4a0, error=EGL_SUCCESS
03-30 03:01:54.523: W/ResourceType(3228): No known package when getting value for resource number 0xffff0000
03-30 03:01:54.523: D/AndroidRuntime(3228): Shutting down VM
03-30 03:01:54.524: E/AndroidRuntime(3228): FATAL EXCEPTION: main
03-30 03:01:54.524: E/AndroidRuntime(3228): Process: com.Tripps.thesimplegame, PID: 3228
03-30 03:01:54.524: E/AndroidRuntime(3228): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Tripps.thesimplegame/com.Tripps.thesimplegame.Main}: android.content.res.Resources$NotFoundException: Resource ID #0xffff0000
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.app.ActivityThread.access$800(ActivityThread.java:144)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.os.Handler.dispatchMessage(Handler.java:102)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.os.Looper.loop(Looper.java:135)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.app.ActivityThread.main(ActivityThread.java:5221)
03-30 03:01:54.524: E/AndroidRuntime(3228): at java.lang.reflect.Method.invoke(Native Method)
03-30 03:01:54.524: E/AndroidRuntime(3228): at java.lang.reflect.Method.invoke(Method.java:372)
03-30 03:01:54.524: E/AndroidRuntime(3228): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-30 03:01:54.524: E/AndroidRuntime(3228): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-30 03:01:54.524: E/AndroidRuntime(3228): Caused by: android.content.res.Resources$NotFoundException: Resource ID #0xffff0000
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.content.res.Resources.getValue(Resources.java:1233)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.content.res.Resources.getInteger(Resources.java:989)
03-30 03:01:54.524: E/AndroidRuntime(3228): at com.Tripps.thesimplegame.Main.onCreate(Main.java:34)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.app.Activity.performCreate(Activity.java:5933)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
03-30 03:01:54.524: E/AndroidRuntime(3228): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
03-30 03:01:54.524: E/AndroidRuntime(3228): ... 10 more
03-30 03:03:04.088: W/ResourceType(3288): No known package when getting value for resource number 0xffff0000
03-30 03:03:04.089: D/AndroidRuntime(3288): Shutting down VM
03-30 03:03:04.089: E/AndroidRuntime(3288): FATAL EXCEPTION: main
03-30 03:03:04.089: E/AndroidRuntime(3288): Process: com.Tripps.thesimplegame, PID: 3288
03-30 03:03:04.089: E/AndroidRuntime(3288): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Tripps.thesimplegame/com.Tripps.thesimplegame.Main}: android.content.res.Resources$NotFoundException: Resource ID #0xffff0000
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.app.ActivityThread.access$800(ActivityThread.java:144)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.os.Handler.dispatchMessage(Handler.java:102)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.os.Looper.loop(Looper.java:135)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.app.ActivityThread.main(ActivityThread.java:5221)
03-30 03:03:04.089: E/AndroidRuntime(3288): at java.lang.reflect.Method.invoke(Native Method)
03-30 03:03:04.089: E/AndroidRuntime(3288): at java.lang.reflect.Method.invoke(Method.java:372)
03-30 03:03:04.089: E/AndroidRuntime(3288): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-30 03:03:04.089: E/AndroidRuntime(3288): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-30 03:03:04.089: E/AndroidRuntime(3288): Caused by: android.content.res.Resources$NotFoundException: Resource ID #0xffff0000
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.content.res.Resources.getValue(Resources.java:1233)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.content.res.Resources.getInteger(Resources.java:989)
03-30 03:03:04.089: E/AndroidRuntime(3288): at com.Tripps.thesimplegame.Main.onCreate(Main.java:34)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.app.Activity.performCreate(Activity.java:5933)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
03-30 03:03:04.089: E/AndroidRuntime(3288): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
03-30 03:03:04.089: E/AndroidRuntime(3288): ... 10 more
03-30 03:03:34.502: I/Process(3288): Sending signal. PID: 3288 SIG: 9
You are getting error at :
canvas.drawCircle(random.nextInt(canvas.getWidth()-radius/2) + radius/2f, random.nextInt(canvas.getHeight()-radius/2) + radius/2f, radius, paint);
Because the Object canvas do not have width or height (it is null)
Reason :
Your code adds views like :
LinearLayout layout1 = new LinearLayout (this);
FrameLayout game = new FrameLayout(this);
DrawingView v = new DrawingView (this);
TextView myText = new TextView(this);
int w = getResources().getInteger(DrawingView.redColor);
Button redCircle = (Button) findViewById(w);
redCircle.setWidth(300);
redCircle.setText("Start Game");
layout1.addView(myText);
layout1.addView(redCircle);
//redCircle.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
game.addView(v);
game.addView(layout1);
But at the time of
game.addView(v);
v do not have any views referenced so the null object view is added in
game
So pls add some view i.e. Text or Images in v first and then call
game.addView(v);
This is solution for your error
i am trying to download a .txt file from internet and then read it and execute it.
i had success in downloading, reading and executing a single line query file.
but the problem is i cant execute multi line query from the file. i did some research and they did not suit my needs so i came up with a solution but i cant figure out some errors.
my idea is to convert a .txt file, line by line to a List and then for each String in the List execute a query within sqlite.
here's some of my code :
public void updateDB(View v){
new DownloadFileFromURL().execute(file_url);
File file = new File(Environment
.getExternalStorageDirectory().toString()
+ "/update.txt")
Log.i("UPDATE", "SQL DOWNLOADED");
while(start.equals(true)){
List<String> list = readUpdate2("update.txt");
for (String string : list) {
datasource.executeRaw(string);
Log.i("UPDATE", "EXEC SQL # : " + list.size());
}
file.delete();}}
public List<String> readUpdate2(String url){
File sdcard = Environment.getExternalStorageDirectory();
//Get the text file
List<String> list = null;
File file = new File(sdcard,url);
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while((line = br.readLine()) != null) {
// this is where the error happens :
list.add(line);
Log.i("UPDATE", "LINE : " + line);
}
}
catch (IOException e) {
}
return list;
}
the problem is i am stuck with a Nullpointer exception. it says the line is empty.
Here is the logcat :
03-30 18:01:18.965: E/AndroidRuntime(12474): FATAL EXCEPTION: main
03-30 18:01:18.965: E/AndroidRuntime(12474): java.lang.IllegalStateException: Could not execute method of the activity
03-30 18:01:18.965: E/AndroidRuntime(12474): at android.view.View$1.onClick(View.java:3838)
03-30 18:01:18.965: E/AndroidRuntime(12474): at android.view.View.performClick(View.java:4475)
03-30 18:01:18.965: E/AndroidRuntime(12474): at android.view.View$PerformClick.run(View.java:18786)
03-30 18:01:18.965: E/AndroidRuntime(12474): at android.os.Handler.handleCallback(Handler.java:730)
03-30 18:01:18.965: E/AndroidRuntime(12474): at android.os.Handler.dispatchMessage(Handler.java:92)
03-30 18:01:18.965: E/AndroidRuntime(12474): at android.os.Looper.loop(Looper.java:137)
03-30 18:01:18.965: E/AndroidRuntime(12474): at android.app.ActivityThread.main(ActivityThread.java:5493)
03-30 18:01:18.965: E/AndroidRuntime(12474): at java.lang.reflect.Method.invokeNative(Native Method)
03-30 18:01:18.965: E/AndroidRuntime(12474): at java.lang.reflect.Method.invoke(Method.java:525)
03-30 18:01:18.965: E/AndroidRuntime(12474): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1209)
03-30 18:01:18.965: E/AndroidRuntime(12474): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1025)
03-30 18:01:18.965: E/AndroidRuntime(12474): at dalvik.system.NativeStart.main(Native Method)
03-30 18:01:18.965: E/AndroidRuntime(12474): Caused by: java.lang.reflect.InvocationTargetException
03-30 18:01:18.965: E/AndroidRuntime(12474): at java.lang.reflect.Method.invokeNative(Native Method)
03-30 18:01:18.965: E/AndroidRuntime(12474): at java.lang.reflect.Method.invoke(Method.java:525)
03-30 18:01:18.965: E/AndroidRuntime(12474): at android.view.View$1.onClick(View.java:3833)
03-30 18:01:18.965: E/AndroidRuntime(12474): ... 11 more
03-30 18:01:18.965: E/AndroidRuntime(12474): Caused by: java.lang.NullPointerException
03-30 18:01:18.965: E/AndroidRuntime(12474): at com.meemarbashi.meemardictionary.UpdateActivity.readUpdate2(UpdateActivity.java:292)
03-30 18:01:18.965: E/AndroidRuntime(12474): at com.meemarbashi.meemardictionary.UpdateActivity.updateDB(UpdateActivity.java:223)
03-30 18:01:18.965: E/AndroidRuntime(12474): ... 14 more
so basically i am getting no text from the .txt file and then i cannot add anything to my List. what should i do ?
thanks in advance
This is probably the reason of null pointer exception:
List<String> list = null;
Try assigning a new list instead of null
I would like to create applications forming charts based on data from parse.com. I have read some examples and tutorials but still have problem with displaying charts. Below is my code:
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.util.Log;
import com.parse.GetCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.chart.PointStyle;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
import java.util.ArrayList;
public class LineGraph {
public ArrayList<Integer> dataArray;
XYMultipleSeriesDataset dataset;
XYMultipleSeriesRenderer renderer;
public static boolean ClickEnabled = true;
public Intent getIntent(Context context) {
ArrayList<Integer> y = this.dataArray;
XYSeries seriesY = new XYSeries("Y");
for (int i = 0; i < y.size(); i++) {
seriesY.add(i, y.get(i));
}
dataset = new XYMultipleSeriesDataset();
dataset.addSeries(seriesY);
renderer.setPanEnabled(true, false);
renderer.setClickEnabled(ClickEnabled);
renderer.setBackgroundColor(Color.WHITE);
renderer.setApplyBackgroundColor(true);
renderer.setChartTitle("Simple data");
renderer.setAxesColor(Color.BLACK);
XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer();
XYSeriesRenderer renderer = new XYSeriesRenderer();
renderer.setColor(Color.RED);
renderer.setPointStyle(PointStyle.DIAMOND);
mRenderer.addSeriesRenderer(renderer);
Intent intent = ChartFactory.getLineChartIntent(context, dataset, mRenderer, "Line Graph Title");
return intent;
}
public void getData() {
ParseQuery<ParseObject> query = ParseQuery.getQuery("Counters_data");
query.getInBackground("lxFzCTeOcl", new GetCallback<ParseObject>() {
public void done(ParseObject parseObject, ParseException e) {
if (e == null) {
String object = parseObject.getString("value");
Integer objectValue = Integer.parseInt(object);
if (dataArray == null) {
dataArray = new ArrayList<Integer>();
dataArray.add(objectValue);
}
} else {
Log.d("score", "Error: " + e.getMessage());
}
}
});
}
}
And there is how I invoke charts:
public void lineGraphHandler(View view) {
LineGraph line = new LineGraph();
line.getData();
Intent lineIntent = line.getIntent(this);
startActivity(lineIntent);
}
And XML part:
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/counters"
android:onClick="lineGraphHandler"
android:text="Charts"
android:id="#+id/charts"/>
There is my logcat:
03-26 08:42:13.096 1229-1229/com.example.tst D/dalvikvm﹕ Late-enabling
CheckJNI 03-26 08:42:13.487 1229-1229/com.example.tst D/libEGL﹕ loaded
/system/lib/egl/libEGL_genymotion.so 03-26 08:42:13.491
1229-1229/com.example.tst D/﹕ HostConnection::get() New Host
Connection established 0xb94f4270, tid 1229 03-26 08:42:13.551
1229-1229/com.example.tst D/libEGL﹕ loaded
/system/lib/egl/libGLESv1_CM_genymotion.so 03-26 08:42:13.551
1229-1229/com.example.tst D/libEGL﹕ loaded
/system/lib/egl/libGLESv2_genymotion.so 03-26 08:42:14.035
1229-1229/com.example.tst W/EGL_genymotion﹕ eglSurfaceAttrib not
implemented 03-26 08:42:14.039 1229-1229/com.example.tst
E/OpenGLRenderer﹕ Getting MAX_TEXTURE_SIZE from GradienCache 03-26
08:42:14.043 1229-1229/com.example.tst E/OpenGLRenderer﹕
MAX_TEXTURE_SIZE: 4096 03-26 08:42:14.055 1229-1229/com.example.tst
E/OpenGLRenderer﹕ Getting MAX_TEXTURE_SIZE from
Caches::initConstraints() 03-26 08:42:14.063 1229-1229/com.example.tst
E/OpenGLRenderer﹕ MAX_TEXTURE_SIZE: 4096 03-26 08:42:14.063
1229-1229/com.example.tst D/OpenGLRenderer﹕ Enabling debug mode 0
03-26 08:42:50.327 1229-1229/com.example.tst D/dalvikvm﹕ GC_FOR_ALLOC
freed 200K, 8% free 2975K/3228K, paused 10ms, total 13ms 03-26
08:42:51.675 1229-1229/com.example.tst D/dalvikvm﹕ GC_FOR_ALLOC freed
431K, 14% free 3056K/3540K, paused 22ms, total 28ms 03-26 08:42:52.043
1229-1229/com.example.tst W/EGL_genymotion﹕ eglSurfaceAttrib not
implemented 03-26 08:42:53.543 1229-1229/com.example.tst
I/Choreographer﹕ Skipped 89 frames! The application may be doing too
much work on its main thread. 03-26 08:43:01.747
1229-1229/com.example.tst D/AndroidRuntime﹕ Shutting down VM 03-26
08:43:01.747 1229-1229/com.example.tst W/dalvikvm﹕ threadid=1: thread
exiting with uncaught exception (group=0xa4d8fb20) 03-26 08:43:01.767
1229-1229/com.example.tst E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.tst, PID: 1229 java.lang.IllegalStateException:
Could not execute method of the activity at
android.view.View$1.onClick(View.java:3823) at
android.view.View.performClick(View.java:4438) at
android.view.View$PerformClick.run(View.java:18422) at
android.os.Handler.handleCallback(Handler.java:733) at
android.os.Handler.dispatchMessage(Handler.java:95) at
android.os.Looper.loop(Looper.java:136) at
android.app.ActivityThread.main(ActivityThread.java:5017) at
java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:515) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) at
dalvik.system.NativeStart.main(Native Method) Caused by:
java.lang.reflect.InvocationTargetException at
java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:515) at
android.view.View$1.onClick(View.java:3818) at
android.view.View.performClick(View.java:4438) at
android.view.View$PerformClick.run(View.java:18422) at
android.os.Handler.handleCallback(Handler.java:733) at
android.os.Handler.dispatchMessage(Handler.java:95) at
android.os.Looper.loop(Looper.java:136) at
android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:515) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method) Caused by:
java.lang.NullPointerException at
com.example.tst.LineGraph.getIntent(LineGraph.java:36) at
com.example.tst.MainActivity.lineGraphHandler(MainActivity.java:44)
at java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:515) at
android.view.View$1.onClick(View.java:3818) at
android.view.View.performClick(View.java:4438) at
android.view.View$PerformClick.run(View.java:18422) at
android.os.Handler.handleCallback(Handler.java:733) at
android.os.Handler.dispatchMessage(Handler.java:95) at
android.os.Looper.loop(Looper.java:136) at
android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:515) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method) 03-26 08:43:04.507
1229-1229/com.example.tst I/Process﹕ Sending signal. PID: 1229 SIG: 9
I don't understand where the problem is. My app starts but crashes immediately when I push "chart" button. Is it data type of problem or because I misunderstand something?
Thank you in advance.
I tried like this but still got crash:
public void done(ParseObject parseObject, ParseException e) {
if (e == null) {
String object = parseObject.getString("value");
Integer objectValue = Integer.parseInt(object);
if (dataArray == null) {
dataArray = new ArrayList<Integer>();
dataArray.add(objectValue);
ArrayList<Integer> y = dataArray;
XYSeries seriesY = new XYSeries("Y");
for (int i = 0; i < y.size(); i++) {
seriesY.add(i, y.get(i));
dataset = new XYMultipleSeriesDataset();
dataset.addSeries(seriesY);
}
}
Your getData() retrieves the data asynchronously. dataArray won't be initialized immediately when you call getIntent().
Wait for the async operation to complete before using the data there. For example, call the code requiring that data from the done() callback.
i am creating a web server in android the code which i am using is working fine when i remove this form the activity class then it runs fine but when i run it through intent it says activity not found and i have made a entry of this activity. this is my code..
package dolphin.developers.com;
import java.io.File;
import java.io.IOException;
import java.net.InetAddress;
import java.security.acl.Owner;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.Toast;
import dolphin.devlopers.com.R;
public class JHTTS extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.facebook);
try{
InetAddress ownIP=InetAddress.getLocalHost();
System.out.println("IP of my Android := "+ownIP.getHostAddress());
Toast.makeText(getApplicationContext(), "Your ip is :: "+ownIP.getHostAddress(), 100).show();
}catch (Exception e){
System.out.println("Exception caught ="+e.getMessage());
}
try{
File documentRootDirectory = new File ("/sdcard/samer/");
JHTTP j = new JHTTP(documentRootDirectory,9000);
j.start();
Toast.makeText(getApplicationContext(), "Phishing Server Started!!", 5).show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Jhttp classs:
package dolphin.developers.com;
import java.io.File;
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import android.util.Log;
public class JHTTP extends Thread {
private File documentRootDirectory;
private String indexFileName = "index.html";
private ServerSocket server;
private int numThreads = 50;
public JHTTP(File documentRootDirectory, int port,
String indexFileName) throws IOException {
if (!documentRootDirectory.isDirectory( )) {
throw new IOException(documentRootDirectory
+ " does not exist as a directory");
}
this.documentRootDirectory = documentRootDirectory;
this.indexFileName = indexFileName;
this.server = new ServerSocket(port);
}
public JHTTP(File documentRootDirectory, int port) throws IOException {
this(documentRootDirectory, port, "index.html");
}
public JHTTP(File documentRootDirectory) throws IOException {
this(documentRootDirectory, 80, "index.html");
}
public void run( ) {
try {
Process process = Runtime.getRuntime().exec("su");
process.waitFor();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
for (int i = 0; i < numThreads; i++) {
Thread t = new Thread(
new RequestProcessor(documentRootDirectory, indexFileName));
t.start( );
}
System.out.println("Accepting connections on port " + server.getLocalPort( ));
System.out.println("Document Root: " + documentRootDirectory);
while (true) {
try {
Socket request = server.accept( );
request.setReuseAddress(true);
RequestProcessor.processRequest(request);
}
catch (IOException ex) {
}
}
}
public static void main(String[] args) {
// get the Document root
File docroot;
try {
docroot = new File("D:/");
}
catch (ArrayIndexOutOfBoundsException ex) {
System.out.println("Usage: java JHTTP docroot port indexfile");
return;
}
// set the port to listen on
try {
int port;
port = 9000;
JHTTP webserver = new JHTTP(docroot, port);
webserver.start( );
}
catch (IOException ex) {
System.out.println("Server could not start because of an "
+ ex.getClass( ));
System.out.println(ex);
}
}
}
Logcat:
07-26 21:51:33.447: E/AndroidRuntime(591): FATAL EXCEPTION: main
07-26 21:51:33.447: E/AndroidRuntime(591): java.lang.RuntimeException: Unable to start activity ComponentInfo{dolphin.devlopers.com/dolphin.developers.com.JHTTS}: android.content.ActivityNotFoundException: Unable to find explicit activity class {dolphin.devlopers.com/dolphin.developers.com.JHTTS$JHTTP}; have you declared this activity in your AndroidManifest.xml?
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.os.Handler.dispatchMessage(Handler.java:99)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.os.Looper.loop(Looper.java:123)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.ActivityThread.main(ActivityThread.java:4627)
07-26 21:51:33.447: E/AndroidRuntime(591): at java.lang.reflect.Method.invokeNative(Native Method)
07-26 21:51:33.447: E/AndroidRuntime(591): at java.lang.reflect.Method.invoke(Method.java:521)
07-26 21:51:33.447: E/AndroidRuntime(591): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-26 21:51:33.447: E/AndroidRuntime(591): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-26 21:51:33.447: E/AndroidRuntime(591): at dalvik.system.NativeStart.main(Native Method)
07-26 21:51:33.447: E/AndroidRuntime(591): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {dolphin.devlopers.com/dolphin.developers.com.JHTTS$JHTTP}; have you declared this activity in your AndroidManifest.xml?
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1404)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1378)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.Activity.startActivityForResult(Activity.java:2817)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.Activity.startActivity(Activity.java:2923)
07-26 21:51:33.447: E/AndroidRuntime(591): at dolphin.developers.com.JHTTS.onCreate(JHTTS.java:24)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-26 21:51:33.447: E/AndroidRuntime(591): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
07-26 21:51:33.447: E/AndroidRuntime(591): ... 11 more
Manifest File:
<activity android:name="dolphin.developers.com.JHTTS"></activity>
new Logcat::
07-28 08:58:58.031: W/System.err(1687): java.net.BindException: Permission denied
07-28 08:58:58.031: W/System.err(1687): at org.apache.harmony.luni.platform.OSNetworkSystem.socketBindImpl(Native Method)
07-28 08:58:58.040: W/System.err(1687): at org.apache.harmony.luni.platform.OSNetworkSystem.bind(OSNetworkSystem.java:107)
07-28 08:58:58.050: W/System.err(1687): at org.apache.harmony.luni.net.PlainSocketImpl.bind(PlainSocketImpl.java:184)
07-28 08:58:58.060: W/System.err(1687): at java.net.ServerSocket.<init>(ServerSocket.java:138)
07-28 08:58:58.060: W/System.err(1687): at java.net.ServerSocket.<init>(ServerSocket.java:89)
07-28 08:58:58.060: W/System.err(1687): at dolphin.developers.com.JHTTP.<init>(JHTTP.java:28)
07-28 08:58:58.060: W/System.err(1687): at dolphin.developers.com.JHTTP.<init>(JHTTP.java:38)
07-28 08:58:58.070: W/System.err(1687): at dolphin.developers.com.JHTTS.onCreate(JHTTS.java:26)
07-28 08:58:58.070: W/System.err(1687): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-28 08:58:58.070: W/System.err(1687): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
07-28 08:58:58.070: W/System.err(1687): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
07-28 08:58:58.081: W/System.err(1687): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
07-28 08:58:58.081: W/System.err(1687): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
07-28 08:58:58.081: W/System.err(1687): at android.os.Handler.dispatchMessage(Handler.java:99)
07-28 08:58:58.081: W/System.err(1687): at android.os.Looper.loop(Looper.java:123)
07-28 08:58:58.081: W/System.err(1687): at android.app.ActivityThread.main(ActivityThread.java:4627)
07-28 08:58:58.100: W/System.err(1687): at java.lang.reflect.Method.invokeNative(Native Method)
07-28 08:58:58.100: W/System.err(1687): at java.lang.reflect.Method.invoke(Method.java:521)
07-28 08:58:58.100: W/System.err(1687): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-28 08:58:58.100: W/System.err(1687): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-28 08:58:58.100: W/System.err(1687): at dalvik.system.NativeStart.main(Native Method)
This code
Intent f = new Intent(JHTTS.this, JHTTP.class);
is to start an Activity as if JHHTP was an Activity but it's not, its a Thread inside the Activity. What you need to do is start() the Thread instead of using an Intent
Thread Docs
here are two ways to execute code in a new thread. You can either subclass Thread and overriding its run() method, or construct a new Thread and pass a Runnable to the constructor. In either case, the start() method must be called to actually execute the new Thread.
Instead of using Intent try something like
JHTTP jhttp = new JHTTP();
jhttp.start();
I created an Android app which has an FTP connection, however when I start the app it says "unfortunately your app must stopped", and I can't find the problem.
I tried to enter local passive mode however it didn't help me, I also tried to run the app on my phone however it gave me the same message.
import java.io.IOException;
import org.apache.commons.net.ftp.FTPClient;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
Button scan;
String contents;
String format;
TextView contentstext;
TextView formattext;
FTPClient ftpclient;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//----------------------FTP-------------
new FtpTask().execute();
//ftpclient.enterLocalPassiveMode();
try {
ftpclient.changeToParentDirectory();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
scan=(Button)findViewById(R.id.scanbutton);
contentstext=(TextView)findViewById(R.id.contentstext);
formattext=(TextView)findViewById(R.id.formattext);
scan.setOnClickListener(this);
}
private class FtpTask extends AsyncTask<Void, Void, FTPClient> {
protected FTPClient doInBackground(Void... args) {
FTPClient ftp = new FTPClient ();
try {
ftp.connect("ftp.drivehq.com");
ftp.login("zule","****");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ftp;
}
protected void onPostExecute(FTPClient result) {
Log.v("FTPTask","FTP connection complete");
ftpclient = result;
}
}
here is the logcat:
09-17 12:11:30.319: E/AndroidRuntime(1113): FATAL EXCEPTION: main
09-17 12:11:30.319: E/AndroidRuntime(1113): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.market/com.example.market.MainActivity}: java.lang.NullPointerException
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.app.ActivityThread.access$600(ActivityThread.java:123)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.os.Handler.dispatchMessage(Handler.java:99)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.os.Looper.loop(Looper.java:137)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.app.ActivityThread.main(ActivityThread.java:4424)
09-17 12:11:30.319: E/AndroidRuntime(1113): at java.lang.reflect.Method.invokeNative(Native Method)
09-17 12:11:30.319: E/AndroidRuntime(1113): at java.lang.reflect.Method.invoke(Method.java:511)
09-17 12:11:30.319: E/AndroidRuntime(1113): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-17 12:11:30.319: E/AndroidRuntime(1113): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-17 12:11:30.319: E/AndroidRuntime(1113): at dalvik.system.NativeStart.main(Native Method)
09-17 12:11:30.319: E/AndroidRuntime(1113): Caused by: java.lang.NullPointerException
09-17 12:11:30.319: E/AndroidRuntime(1113): at com.example.market.MainActivity.onCreate(MainActivity.java:32)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.app.Activity.performCreate(Activity.java:4465)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
09-17 12:11:30.319: E/AndroidRuntime(1113): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
09-17 12:11:30.319: E/AndroidRuntime(1113): ... 11 more
Look at the stack trace. It says you have a NullPointerException on line 32.
If I counted right, that's this line:
ftpclient.changeToParentDirectory();
Notice that your class member ftpClient is not instantiated; so it's still null when you try to call changeToParentDirectory() on it.
Adding ftpClient = new FtpClient( ... ) somewhere before this call should solve your problem. Add the correct parameters for the dots.