This question already has answers here:
How can I fix 'android.os.NetworkOnMainThreadException'?
(66 answers)
Closed 8 years ago.
I am trying to create a function in an Android app that sends a message to a PHP file on a webserver (in my case, localhost) and have the PHP display the text. I am able to connect with the PHP file but only read JSON data from the file. I want to send data to the file and display it. Any ideas on how I can do this? I have tried a tutorial but my app is crashing.
Here is my code for this tutorial:
PHP code:
<?php
// get the "message" variable from the post request
// this is the data coming from the Android app
$message=$_POST["message"];
// specify the file where we will save the contents of the variable message
$filename="androidmessages.html";
// write (append) the data to the file
file_put_contents($filename,$message."<br />",FILE_APPEND);
// load the contents of the file to a variable
$androidmessages=file_get_contents($filename);
// display the contents of the variable (which has the contents of the file)
echo $androidmessages;
?>
Activity:
package com.yoursite.helloworld;
import java.io.IOException;
import org.apache.http.client.ClientProtocolException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.message.BasicNameValuePair;
// import everything you need
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class HelloWorldActivity extends Activity {
Button sendButton;
EditText msgTextField;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// load the layout
setContentView(R.layout.main);
// make message text field object
msgTextField = (EditText) findViewById(R.id.msgTextField);
// make send button object
sendButton = (Button) findViewById(R.id.sendButton);
}
// this is the function that gets called when you click the button
public void send(View v)
{
// get the message from the message text box
String msg = msgTextField.getText().toString();
// make sure the fields are not empty
if (msg.length()>0)
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.0.9/testPHP.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "12345"));
nameValuePairs.add(new BasicNameValuePair("message", msg));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
msgTextField.setText(""); // clear text box
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
else
{
// display message if text fields are empty
Toast.makeText(getBaseContext(),"All field are required",Toast.LENGTH_SHORT).show();
}
}
}
Logcat:
05-27 12:27:18.400: I/Process(9241): Sending signal. PID: 9241 SIG: 9
05-27 12:27:24.705: D/libEGL(9361): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so
05-27 12:27:24.705: D/libEGL(9361): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so
05-27 12:27:24.713: D/libEGL(9361): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
05-27 12:27:24.783: D/OpenGLRenderer(9361): Enabling debug mode 0
05-27 12:27:31.838: D/AndroidRuntime(9361): Shutting down VM
05-27 12:27:31.838: W/dalvikvm(9361): threadid=1: thread exiting with uncaught exception (group=0x416fe7c0)
05-27 12:27:31.845: E/AndroidRuntime(9361): FATAL EXCEPTION: main
05-27 12:27:31.845: E/AndroidRuntime(9361): java.lang.IllegalStateException: Could not execute method of the activity
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.view.View$1.onClick(View.java:3640)
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.view.View.performClick(View.java:4247)
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.view.View$PerformClick.run(View.java:17728)
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.os.Handler.handleCallback(Handler.java:730)
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.os.Handler.dispatchMessage(Handler.java:92)
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.os.Looper.loop(Looper.java:137)
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.app.ActivityThread.main(ActivityThread.java:5289)
05-27 12:27:31.845: E/AndroidRuntime(9361): at java.lang.reflect.Method.invokeNative(Native Method)
05-27 12:27:31.845: E/AndroidRuntime(9361): at java.lang.reflect.Method.invoke(Method.java:525)
05-27 12:27:31.845: E/AndroidRuntime(9361): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
05-27 12:27:31.845: E/AndroidRuntime(9361): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
05-27 12:27:31.845: E/AndroidRuntime(9361): at dalvik.system.NativeStart.main(Native Method)
05-27 12:27:31.845: E/AndroidRuntime(9361): Caused by: java.lang.reflect.InvocationTargetException
05-27 12:27:31.845: E/AndroidRuntime(9361): at java.lang.reflect.Method.invokeNative(Native Method)
05-27 12:27:31.845: E/AndroidRuntime(9361): at java.lang.reflect.Method.invoke(Method.java:525)
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.view.View$1.onClick(View.java:3635)
05-27 12:27:31.845: E/AndroidRuntime(9361): ... 11 more
05-27 12:27:31.845: E/AndroidRuntime(9361): Caused by: android.os.NetworkOnMainThreadException
05-27 12:27:31.845: E/AndroidRuntime(9361): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
05-27 12:27:31.845: E/AndroidRuntime(9361): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
05-27 12:27:31.845: E/AndroidRuntime(9361): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
05-27 12:27:31.845: E/AndroidRuntime(9361): at libcore.io.IoBridge.connect(IoBridge.java:112)
05-27 12:27:31.845: E/AndroidRuntime(9361): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
05-27 12:27:31.845: E/AndroidRuntime(9361): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:460)
05-27 12:27:31.845: E/AndroidRuntime(9361): at java.net.Socket.connect(Socket.java:832)
05-27 12:27:31.845: E/AndroidRuntime(9361): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
05-27 12:27:31.845: E/AndroidRuntime(9361): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
05-27 12:27:31.845: E/AndroidRuntime(9361): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
05-27 12:27:31.845: E/AndroidRuntime(9361): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
05-27 12:27:31.845: E/AndroidRuntime(9361): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
05-27 12:27:31.845: E/AndroidRuntime(9361): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-27 12:27:31.845: E/AndroidRuntime(9361): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-27 12:27:31.845: E/AndroidRuntime(9361): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-27 12:27:31.845: E/AndroidRuntime(9361): at com.example.testphp.MainActivity.send(MainActivity.java:63)
I have given permission to use the internet. Any ideas on why the app is crashing?
Make sure that you are running your Network stuff out of the mainUI. Example: Do it in a Thread or in an AsyncTask.
Example:
In your MainUI new MyAsyncTask().execute();
private class MyAsyncTask extends AsyncTask<String, Integer, Double>{
#Override
protected Double doInBackground(String... params) {
postData(params[0]);
return null;
}
protected void onPostExecute(Double result){}
protected void onProgressUpdate(Integer... progress){
pb.setProgress(progress[0]);
}
}
public void postData(String valueIWantToSend) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://somewebsite.com/receiver.php");
try {
List nameValuePairs = new ArrayList();
nameValuePairs.add(new BasicNameValuePair("myHttpData", valueIwantToSend));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
} catch (Exception e) {}
}
Related
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 have been working on an app to use a phone's/tablet's camera flash as a flashlight. Everything seemed to be working fine but when I tested it on my Droid Bionic running Android 4.1.2, the app failed to turn on the flash even though it said it did. Here is the java code I used:
package com.example.flash;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
private boolean isFlashOn = false;
private Camera camera;
private Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.buttonFlashlight);
Context context = this;
PackageManager pm = context.getPackageManager();
if(!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
Log.e("err", "Device has no camera!");
Toast.makeText(getApplicationContext(),
"Your device doesn't have camera!",Toast.LENGTH_SHORT).show();
return;
}
camera = Camera.open();
final Parameters p = camera.getParameters();
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
if (isFlashOn) {
Log.i("info", "torch is turned off!");
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
isFlashOn = false;
button.setText("Tap to turn flashlight on.");
}
else {
Log.i("info", "torch is turned on!");
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
isFlashOn = true;
button.setText("Tap to turn flashlight off.");
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
protected void onStop() {
super.onStop();
if (camera != null) {
camera.release();
}
}}
Is this code correct or did I miss something?
Logcat:
07-03 18:48:29.064: E/Trace(773): error opening trace file: No such file or directory (2)
07-03 18:48:30.535: D/Camera(773): app passed NULL surface
07-03 18:48:31.023: D/libEGL(773): loaded /system/lib/egl/libEGL_emulation.so
07-03 18:48:31.073: D/(773): HostConnection::get() New Host Connection established 0x2a13c3c0, tid 773
07-03 18:48:31.123: D/libEGL(773): loaded /system/lib/egl/libGLESv1_CM_emulation.so
07-03 18:48:31.173: D/libEGL(773): loaded /system/lib/egl/libGLESv2_emulation.so
07-03 18:48:31.406: W/EGL_emulation(773): eglSurfaceAttrib not implemented
07-03 18:48:31.433: D/OpenGLRenderer(773): Enabling debug mode 0
07-03 18:48:31.723: I/Choreographer(773): Skipped 58 frames! The application may be doing too much work on its main thread.
07-03 18:49:05.923: D/dalvikvm(773): GC_CONCURRENT freed 202K, 12% free 2623K/2956K, paused 74ms+25ms, total 234ms
07-03 18:49:06.216: W/EGL_emulation(773): eglSurfaceAttrib not implemented
07-03 18:49:09.584: D/Camera(773): app passed NULL surface
07-03 18:49:09.853: W/EGL_emulation(773): eglSurfaceAttrib not implemented
07-03 18:49:11.813: I/info(773): torch is turned on!
07-03 18:49:13.467: I/info(773): torch is turned off!
07-03 18:49:16.263: W/EGL_emulation(773): eglSurfaceAttrib not implemented
07-03 18:49:16.713: D/AndroidRuntime(773): Shutting down VM
07-03 18:49:16.713: W/dalvikvm(773): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
07-03 18:49:16.936: E/AndroidRuntime(773): FATAL EXCEPTION: main
07-03 18:49:16.936: E/AndroidRuntime(773): java.lang.RuntimeException: Method called after release()
07-03 18:49:16.936: E/AndroidRuntime(773): at android.hardware.Camera._stopPreview(Native Method)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.hardware.Camera.stopPreview(Camera.java:543)
07-03 18:49:16.936: E/AndroidRuntime(773): at com.example.flash.MainActivity.surfaceDestroyed(MainActivity.java:140)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.SurfaceView.updateWindow(SurfaceView.java:553)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:231)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.View.dispatchWindowVisibilityChanged(View.java:7544)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1039)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1039)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1039)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1039)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1211)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.Choreographer.doFrame(Choreographer.java:532)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.os.Handler.handleCallback(Handler.java:725)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.os.Handler.dispatchMessage(Handler.java:92)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.os.Looper.loop(Looper.java:137)
07-03 18:49:16.936: E/AndroidRuntime(773): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-03 18:49:16.936: E/AndroidRuntime(773): at java.lang.reflect.Method.invokeNative(Native Method)
07-03 18:49:16.936: E/AndroidRuntime(773): at java.lang.reflect.Method.invoke(Method.java:511)
07-03 18:49:16.936: E/AndroidRuntime(773): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-03 18:49:16.936: E/AndroidRuntime(773): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-03 18:49:16.936: E/AndroidRuntime(773): at dalvik.system.NativeStart.main(Native Method)
07-03 18:49:24.854: E/Trace(811): error opening trace file: No such file or directory (2)
07-03 18:49:25.413: D/libEGL(811): loaded /system/lib/egl/libEGL_emulation.so
07-03 18:49:25.567: D/(811): HostConnection::get() New Host Connection established 0x2a15f570, tid 811
07-03 18:49:25.643: D/libEGL(811): loaded /system/lib/egl/libGLESv1_CM_emulation.so
07-03 18:49:25.663: D/libEGL(811): loaded /system/lib/egl/libGLESv2_emulation.so
07-03 18:49:25.934: W/EGL_emulation(811): eglSurfaceAttrib not implemented
07-03 18:49:25.963: D/OpenGLRenderer(811): Enabling debug mode 0
07-03 18:53:12.298: D/Camera(811): app passed NULL surface
07-03 18:53:12.723: D/dalvikvm(811): GC_CONCURRENT freed 172K, 11% free 2600K/2904K, paused 9ms+165ms, total 421ms
07-03 18:53:12.934: E/EGL_emulation(811): rcCreateWindowSurface returned 0
07-03 18:53:12.934: E/EGL_emulation(811): tid 811: eglCreateWindowSurface(631): error 0x3003 (EGL_BAD_ALLOC)
07-03 18:53:12.943: D/AndroidRuntime(811): Shutting down VM
07-03 18:53:12.943: W/dalvikvm(811): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
07-03 18:53:13.033: E/AndroidRuntime(811): FATAL EXCEPTION: main
07-03 18:53:13.033: E/AndroidRuntime(811): java.lang.RuntimeException: createWindowSurface failed EGL_BAD_ALLOC
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.HardwareRenderer$GlRenderer.createSurface(HardwareRenderer.java:1064)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.HardwareRenderer$GlRenderer.createEglSurface(HardwareRenderer.java:961)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.HardwareRenderer$GlRenderer.initialize(HardwareRenderer.java:787)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1502)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.Choreographer.doFrame(Choreographer.java:532)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.os.Handler.handleCallback(Handler.java:725)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.os.Handler.dispatchMessage(Handler.java:92)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.os.Looper.loop(Looper.java:137)
07-03 18:53:13.033: E/AndroidRuntime(811): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-03 18:53:13.033: E/AndroidRuntime(811): at java.lang.reflect.Method.invokeNative(Native Method)
07-03 18:53:13.033: E/AndroidRuntime(811): at java.lang.reflect.Method.invoke(Method.java:511)
07-03 18:53:13.033: E/AndroidRuntime(811): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-03 18:53:13.033: E/AndroidRuntime(811): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-03 18:53:13.033: E/AndroidRuntime(811): at dalvik.system.NativeStart.main(Native Method)
UPDATE
I think the key is you are running Android 4.1.2. Since Android 4.0, if you want to use the Camera Device, even if you only want to use the flash, you are forced to use a SurfaceView.
In the previous answer (below), I gave you a link to a Torch app which uses SurfaceView. Try it or adapt it to your code.
PREVIOUS ANSWER:
As stated in many other cases (like this one), you may be facing a Device-Specific issue that is quite common in the Android world.
Although getSupportedFlashModes() may return FLASH_MODE_TORCH on nearly every device, many of them don't actually support it.
Anyway, you could try these:
Use camera.startPreview(); after camera = Camera.open();
Try setting FLASH_MODE_OFF initially (before camera.startPreview();).
Check if this Torch app works in your device. In case it does, you have the source code to compare it to yours.
Download a Torch app from the Play Store to test if it's a device issue or not.
Post the issue in a Droid Bionic support forum.
UPDATE: I would say the final keyword is a problem in your code. Try changing it to:
//camera = Camera.open();
//final Parameters p = camera.getParameters();
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
if (isFlashOn) {
Log.i("info", "torch is turned off!");
cam.stopPreview();
cam.release();
isFlashOn = false;
button.setText("Tap to turn flashlight on.");
}
else {
Log.i("info", "torch is turned on!");
camera = Camera.open();
Parameters p = camera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
camera.startPreview();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
isFlashOn = true;
button.setText("Tap to turn flashlight off.");
}
}
});
user the permission "android.permission.FLASHLIGHT" in the manifest
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.CAMERA" />
I have some problems with my simple app in Android with Java code. I'm trying to set a RadioGroup that works like settings for color of buttons. When I start my app in Settings activity (Settings.java), it crashes.
package com.app.testing;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class Settings extends Main implements OnCheckedChangeListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.ButtonSettingsView);
int checkedRadioButton = radioGroup.getCheckedRadioButtonId();
switch (checkedRadioButton) {
case R.id.redbtn :
add.setBackgroundColor(21);
break;
case R.id.blubtn :
add.setBackgroundColor(58);
break;
case R.id.grebtn :
add.setBackgroundColor(13);
break;
}
Button back = (Button) findViewById(R.id.back);
back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
}
#Override
public void onCheckedChanged(RadioGroup arg0, int arg1) {
// TODO Auto-generated method stub
}
}
Log:
05-27 16:27:49.611: E/AndroidRuntime(4970): FATAL EXCEPTION: main
05-27 16:27:49.611: E/AndroidRuntime(4970): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app.testing/com.app.testing.Settings}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.RadioGroup
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.os.Handler.dispatchMessage(Handler.java:99)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.os.Looper.loop(Looper.java:137)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-27 16:27:49.611: E/AndroidRuntime(4970): at java.lang.reflect.Method.invokeNative(Native Method)
05-27 16:27:49.611: E/AndroidRuntime(4970): at java.lang.reflect.Method.invoke(Method.java:511)
05-27 16:27:49.611: E/AndroidRuntime(4970): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-27 16:27:49.611: E/AndroidRuntime(4970): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-27 16:27:49.611: E/AndroidRuntime(4970): at dalvik.system.NativeStart.main(Native Method)
05-27 16:27:49.611: E/AndroidRuntime(4970): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.RadioGroup
05-27 16:27:49.611: E/AndroidRuntime(4970): at com.app.testing.Settings.onCreate(Settings.java:16)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.app.Activity.performCreate(Activity.java:5104)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-27 16:27:49.611: E/AndroidRuntime(4970): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
05-27 16:27:49.611: E/AndroidRuntime(4970): ... 11 more
Thanks
It seems the problem is in this line
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.ButtonSettingsView);
May be you are trying to cast a TextView to RadioGroup. Check your xml. I am afraid that your id ButtonSettingsView is a textView
I think the LogCat says it all:
Check your XML layout file: is ButtonSettingsView actually a RadioGroup?
I've been following the Android tutorials and created MyFirstApp (see http://developer.android.com/training/basics/firstapp/index.html) and I can launch the app ok on the emulator, but upon entering a message and hitting "send" I get an IllegalStateException caused by a NullPointerException at this line in the below code:
String message = editText.getText().toString();
Upon debugging, it is clear that editText is null at this point, but I cannot see why, or anything I've missed in the tutorial.
My MainActivity class:
package com.example.myfirstapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
/**
* <p>Main Activity class for the App</p>
*
* #author - thebloodguy
*/
public class MainActivity extends Activity {
//~ ----------------------------------------------------------------------------------------------------------------
//~ Static fields/initializers
//~ ----------------------------------------------------------------------------------------------------------------
/** Key to the extra message data in the sendMessage intent */
public static final String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";
//~ ----------------------------------------------------------------------------------------------------------------
//~ Methods
//~ ----------------------------------------------------------------------------------------------------------------
/**
* {#inheritDoc}
*/
#Override
public boolean onCreateOptionsMenu(Menu menu) {
/* Inflate the menu; this adds items to the action bar if it is present */
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
/**
* <p>Send a message using the data in the {#link View}</p>
*
* #param view - the {#link View} object representing the state of the view when the message is sent
*/
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) view.findViewById(R.id.edit_message);
String message = editText.getText().toString(); // This is the guilty line
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
/**
* {#inheritDoc}
*/
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
My activity_main.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="horizontal" >
<EditText android:id="#+id/edit_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="#string/edit_message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send"
android:onClick="sendMessage" />
</LinearLayout>
and the LogCat output:
12-21 10:02:32.210: E/Trace(621): error opening trace file: No such file or directory (2)
12-21 10:02:32.250: W/ActivityThread(621): Application com.example.myfirstapp is waiting for the debugger on port 8100...
12-21 10:02:32.270: I/System.out(621): Sending WAIT chunk
12-21 10:02:32.280: I/dalvikvm(621): Debugger is active
12-21 10:02:32.480: I/System.out(621): Debugger has connected
12-21 10:02:32.480: I/System.out(621): waiting for debugger to settle...
12-21 10:02:32.680: I/System.out(621): waiting for debugger to settle...
12-21 10:02:32.889: I/System.out(621): waiting for debugger to settle...
12-21 10:02:33.091: I/System.out(621): waiting for debugger to settle...
12-21 10:02:33.290: I/System.out(621): waiting for debugger to settle...
12-21 10:02:33.534: I/System.out(621): waiting for debugger to settle...
12-21 10:02:33.796: I/System.out(621): waiting for debugger to settle...
12-21 10:02:33.990: I/System.out(621): waiting for debugger to settle...
12-21 10:02:34.204: I/System.out(621): debugger has settled (1353)
12-21 10:02:35.429: D/gralloc_goldfish(621): Emulator without GPU emulation detected.
12-21 10:05:11.510: I/Choreographer(621): Skipped 94 frames! The application may be doing too much work on its main thread.
12-21 10:05:13.850: I/Choreographer(621): Skipped 35 frames! The application may be doing too much work on its main thread.
12-21 10:05:15.571: I/Choreographer(621): Skipped 38 frames! The application may be doing too much work on its main thread.
12-21 10:06:53.724: D/AndroidRuntime(621): Shutting down VM
12-21 10:06:53.724: W/dalvikvm(621): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
12-21 10:06:53.840: E/AndroidRuntime(621): FATAL EXCEPTION: main
12-21 10:06:53.840: E/AndroidRuntime(621): java.lang.IllegalStateException: Could not execute method of the activity
12-21 10:06:53.840: E/AndroidRuntime(621): at android.view.View$1.onClick(View.java:3591)
12-21 10:06:53.840: E/AndroidRuntime(621): at android.view.View.performClick(View.java:4084)
12-21 10:06:53.840: E/AndroidRuntime(621): at android.view.View$PerformClick.run(View.java:16966)
12-21 10:06:53.840: E/AndroidRuntime(621): at android.os.Handler.handleCallback(Handler.java:615)
12-21 10:06:53.840: E/AndroidRuntime(621): at android.os.Handler.dispatchMessage(Handler.java:92)
12-21 10:06:53.840: E/AndroidRuntime(621): at android.os.Looper.loop(Looper.java:137)
12-21 10:06:53.840: E/AndroidRuntime(621): at android.app.ActivityThread.main(ActivityThread.java:4745)
12-21 10:06:53.840: E/AndroidRuntime(621): at java.lang.reflect.Method.invokeNative(Native Method)
12-21 10:06:53.840: E/AndroidRuntime(621): at java.lang.reflect.Method.invoke(Method.java:511)
12-21 10:06:53.840: E/AndroidRuntime(621): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-21 10:06:53.840: E/AndroidRuntime(621): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-21 10:06:53.840: E/AndroidRuntime(621): at dalvik.system.NativeStart.main(Native Method)
12-21 10:06:53.840: E/AndroidRuntime(621): Caused by: java.lang.reflect.InvocationTargetException
12-21 10:06:53.840: E/AndroidRuntime(621): at java.lang.reflect.Method.invokeNative(Native Method)
12-21 10:06:53.840: E/AndroidRuntime(621): at java.lang.reflect.Method.invoke(Method.java:511)
12-21 10:06:53.840: E/AndroidRuntime(621): at android.view.View$1.onClick(View.java:3586)
12-21 10:06:53.840: E/AndroidRuntime(621): ... 11 more
12-21 10:06:53.840: E/AndroidRuntime(621): Caused by: java.lang.NullPointerException
12-21 10:06:53.840: E/AndroidRuntime(621): at com.example.myfirstapp.MainActivity.sendMessage(MainActivity.java:61)
12-21 10:06:53.840: E/AndroidRuntime(621): ... 14 more
Change this line
EditText editText = (EditText) view.findViewById(R.id.edit_message);
to
EditText editText = (EditText)findViewById(R.id.edit_message);
here in sendMessage method, view parameter is the Button being clicked, and EditText is not child of this view, so you need to call findViewById from the activity content view, which you call by
EditText editText = (EditText) findViewById(R.id.edit_message);
I have this code for an expandable list, I want to have a checkbox in the childgroups of the list view, and check if one of the checkboxes is checked.
The problem is that when I check if the checkbox is checked I get a NULL Pointer Exception.
Can you please tell me whats wrong?
here's my code - I've edited the code to inflate a view of the child_row.xml that holds that checkbox but I still get that null pointer, what am I doing wrong?!?!
package send.Shift;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.ExpandableListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;
public class Shifts extends ExpandableListActivity implements
OnCheckedChangeListener {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.list);
SimpleExpandableListAdapter expListAdapter = new SimpleExpandableListAdapter(
this, createGroupList(), R.layout.group_row,
new String[] { "Group Item" }, new int[] { R.id.row_name },
createChildList(), R.layout.child_row,
new String[] { "Sub Item" }, new int[] { R.id.grp_child });
getExpandableListView().setGroupIndicator(
getResources().getDrawable(R.drawable.expander_group));
ExpandableListView EX = (ExpandableListView) findViewById(android.R.id.list);
EX.setAdapter(expListAdapter);
final CheckBox childBox = (CheckBox) findViewById(R.id.childBOX);
final TextView choosenGroup = (TextView) findViewById(R.id.choosen);
LayoutInflater inflater = LayoutInflater.from(Shifts.this);
View view2 = inflater.inflate(R.layout.child_row, null);
childBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(childBox.isChecked() == true){
choosenGroup.setText("Shift Set");
}
}
});
}
Here is some of the Logcat log:
12-23 07:38:00.644: W/dalvikvm(880): threadid=1: thread exiting with uncaught exception (group=0x40015560)
12-23 07:38:00.654: E/AndroidRuntime(880): FATAL EXCEPTION: main
12-23 07:38:00.654: E/AndroidRuntime(880): java.lang.RuntimeException: Unable to start activity ComponentInfo{send.Shift/send.Shift.Shifts}: java.lang.NullPointerException
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.os.Handler.dispatchMessage(Handler.java:99)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.os.Looper.loop(Looper.java:123)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-23 07:38:00.654: E/AndroidRuntime(880): at java.lang.reflect.Method.invokeNative(Native Method)
12-23 07:38:00.654: E/AndroidRuntime(880): at java.lang.reflect.Method.invoke(Method.java:507)
12-23 07:38:00.654: E/AndroidRuntime(880): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-23 07:38:00.654: E/AndroidRuntime(880): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-23 07:38:00.654: E/AndroidRuntime(880): at dalvik.system.NativeStart.main(Native Method)
12-23 07:38:00.654: E/AndroidRuntime(880): Caused by: java.lang.NullPointerException
12-23 07:38:00.654: E/AndroidRuntime(880): at send.Shift.Shifts.onCreate(Shifts.java:41)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
12-23 07:38:00.654: E/AndroidRuntime(880): ... 11 more
If you get a nullpointer on a certain line, something on that line is null. If it is the if(childBox.isChecked() line, probably childBox is null. Hard to say without the stack, but most probable cause is the line where you retrieve that checkbox.
final CheckBox childBox = (CheckBox) findViewById(R.id.childBOX);
Might be returning null, and this could be for several reasons. It could be your id is childBox instead of childBOX. Or that it is not in R.layout.list.
The best thing you can do is start debugging. What line is the error. Find the object that is null. Find out why it is null and if that is expected or not.
Instead of checking the childBox.isChecked() you can use the isChecked value. So your code would look like this:
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked == true){
choosenGroup.setText("Shift Set");
}
}
Check your layout list.xml I think this layout may is missing android:id="#+id/childBOX" for Check Box or android:id="#+id/choosen" for TextView
Check the folowin sample
<CheckBox android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/childBOX"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/choosen"/>