I've been trying develop a custom camera application for my project. I have followed pretty much every steps on the android developers website for the deprecated android.hardware.Camera class, as I need to stay compatible for older devices. I have added the permission for the camera and the features for the camera and the autofocus. I am currently testing with the emulator provided by android studio, the Nexus 5 API 23 x86 with both front-facing and back-facing cameras set on emulated. When my code reaches the Camera.open() bit, I get the error -13: Fail to connect to camera service.
I moved my camera initialization at many places but it always throws that error and returns null. The built-in Camera app in the emulator does work properly for both camera and they are both detected in my code. I simply cannot find why it doesn't work.
Here's my code just in case:
CameraActivity.java
/**
* An example full-screen activity that shows and hides the system UI (i.e.
* status bar and navigation/system bar) with user interaction.
*/
public class CameraActivity extends AppCompatActivity {
private static final boolean AUTO_HIDE = true;
private static final int AUTO_HIDE_DELAY_MILLIS = 3000;
private static final int UI_ANIMATION_DELAY = 300;
private View mControlsView;
private boolean mVisible;
private CameraView mCameraView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
mVisible = true;
mControlsView = findViewById(R.id.fullscreen_content_controls);
mCameraView = new CameraView(this);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_view);
preview.addView(mCameraView);
// Set up the user interaction to manually show or hide the system UI.
mCameraView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
toggle();
}
});
// Upon interacting with UI controls, delay any scheduled hide()
// operations to prevent the jarring behavior of controls going away
// while interacting with the UI.
findViewById(R.id.capture_button).setOnTouchListener(mDelayHideTouchListener);
//// TODO: 2015-11-05 Create a preview class extending SurfaceView and implementing SurfaceHolder.callback and put camera code there
//// TODO: 2015-11-05 http://developer.android.com/guide/topics/media/camera.html#custom-camera
//// TODO: 2015-11-05 http://stackoverflow.com/questions/26305107/how-to-fix-fail-to-connect-to-camera-service-exception-in-android-emulator
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Trigger the initial hide() shortly after the activity has been
// created, to briefly hint to the user that UI controls
// are available.
delayedHide(100);
}
/**
* Touch listener to use for in-layout UI controls to delay hiding the
* system UI. This is to prevent the jarring behavior of controls going away
* while interacting with activity UI.
*/
private final View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (AUTO_HIDE) {
delayedHide(AUTO_HIDE_DELAY_MILLIS);
}
return false;
}
};
private void toggle() {
if (mVisible) {
hide();
} else {
show();
}
}
private void hide() {
// Hide UI first
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.hide();
}
mControlsView.setVisibility(View.GONE);
mVisible = false;
// Schedule a runnable to remove the status and navigation bar after a delay
mHideHandler.removeCallbacks(mShowPart2Runnable);
mHideHandler.postDelayed(mHidePart2Runnable, UI_ANIMATION_DELAY);
}
private final Runnable mHidePart2Runnable = new Runnable() {
#SuppressLint("InlinedApi")
#Override
public void run() {
// Delayed removal of status and navigation bar
// Note that some of these constants are new as of API 16 (Jelly Bean)
// and API 19 (KitKat). It is safe to use them, as they are inlined
// at compile-time and do nothing on earlier devices.
mCameraView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
}
};
#SuppressLint("InlinedApi")
private void show() {
// Show the system bar
mCameraView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
mVisible = true;
// Schedule a runnable to display UI elements after a delay
mHideHandler.removeCallbacks(mHidePart2Runnable);
mHideHandler.postDelayed(mShowPart2Runnable, UI_ANIMATION_DELAY);
}
private final Runnable mShowPart2Runnable = new Runnable() {
#Override
public void run() {
// Delayed display of UI elements
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.show();
}
mControlsView.setVisibility(View.VISIBLE);
}
};
private final Handler mHideHandler = new Handler();
private final Runnable mHideRunnable = new Runnable() {
#Override
public void run() {
hide();
}
};
/**
* Schedules a call to hide() in [delay] milliseconds, canceling any
* previously scheduled calls.
*/
private void delayedHide(int delayMillis) {
mHideHandler.removeCallbacks(mHideRunnable);
mHideHandler.postDelayed(mHideRunnable, delayMillis);
}
#Override
protected void onPause(){
super.onPause();
mCameraView.releaseCamera();
}
}
CameraView.java
import android.hardware.Camera; //This is the good import!
/**
* TODO: document your custom view class.
*/
#SuppressWarnings("deprecation")
public class CameraView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraView(Context context) {
super(context);
try{
mCamera = Camera.open();
} catch (Exception e){
Log.e("CameraView", "Error creating camera: " + e.getMessage());
}
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
try{
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (IOException e){
Log.d("surfaceCreated", "Error starting camera preview: " + e.getMessage());
}
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if(mHolder.getSurface() == null)
return;
try{
mCamera.stopPreview();
} catch (Exception e) {
//Non-existent o.O
}
//Resize, etc
try{
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (IOException e) {
Log.d("CameraView", "Error starting camera preview: " + e.getMessage());
}
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
if(mCamera != null)
mCamera.stopPreview();
}
public void releaseCamera(){
if(mCamera != null){
mCamera.release();
mCamera = null;
}
}
}
The logcat:
11-09 14:13:13.144 7791-7791/? I/art: Not late-enabling -Xcheck:jni (already on)
11-09 14:13:13.144 7791-7791/? I/art: Late-enabling JIT
11-09 14:13:13.146 7791-7791/? I/art: JIT created with code_cache_capacity=2MB compile_threshold=1000
11-09 14:13:13.212 7791-7791/com.weebly.olipro007.cameracontrol W/System: ClassLoader referenced unknown path: /data/app/com.weebly.olipro007.cameracontrol-1/lib/x86
11-09 14:13:13.427 7791-7791/com.weebly.olipro007.cameracontrol W/CameraBase: An error occurred while connecting to camera: 0
11-09 14:13:13.427 7791-7791/com.weebly.olipro007.cameracontrol E/CameraView: Error creating camera: Fail to connect to camera service
11-09 14:13:13.489 7791-7820/com.weebly.olipro007.cameracontrol D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
11-09 14:13:13.508 7791-7791/com.weebly.olipro007.cameracontrol D/: HostConnection::get() New Host Connection established 0xab645030, tid 7791
11-09 14:13:13.584 7791-7820/com.weebly.olipro007.cameracontrol D/: HostConnection::get() New Host Connection established 0xab6451c0, tid 7820
11-09 14:13:13.611 7791-7820/com.weebly.olipro007.cameracontrol I/OpenGLRenderer: Initialized EGL, version 1.4
11-09 14:13:13.693 7791-7820/com.weebly.olipro007.cameracontrol W/EGL_emulation: eglSurfaceAttrib not implemented
11-09 14:13:13.693 7791-7820/com.weebly.olipro007.cameracontrol W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xabdff9a0, error=EGL_SUCCESS
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol D/AndroidRuntime: Shutting down VM
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: FATAL EXCEPTION: main
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: Process: com.weebly.olipro007.cameracontrol, PID: 7791
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.hardware.Camera.setPreviewDisplay(android.view.SurfaceHolder)' on a null object reference
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at com.weebly.olipro007.cameracontrol.CameraView.surfaceCreated(CameraView.java:43)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.SurfaceView.updateWindow(SurfaceView.java:582)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:177)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2055)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.Choreographer.doCallbacks(Choreographer.java:670)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.Choreographer.doFrame(Choreographer.java:606)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.os.Looper.loop(Looper.java:148)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5417)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
11-09 14:13:13.699 7791-7791/com.weebly.olipro007.cameracontrol E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
11-09 14:13:16.909 7791-7791/? I/Process: Sending signal. PID: 7791 SIG: 9
Well it seems that the service was completely blocked for the old api in Marshmallow. I switched the emulator to lollipop and it loads...
Related
I theoretically have 2 related questions.
1) I tried to make a night mode for my app. That works so far pretty good. Then I wanted to put the setting the User chooses to SharedPreferences. In my first try, It just didn't work. All I did was getting red and causing errors. After a lot of research on the Internet, I found another idea. Now the app is starting but crashing immediately again. The error has to be in the SharedPreferences because as soon as I delete this part it is working again. I just can't find the error and it doesn't show me a red area or so either.
2) Just to check if my research are right. Is it true that it is not possible anymore to make a time-related Night mode? Means dark at night, light at day? I found out that MODE_NIGHT_AUTO_TIME was supposed to do that but is deprecated and they suggest to use MODE_NIGHT_AUTO_BATTERY which is kinda something really different.
btw. here is my code if it helps from the Setting:
public class Settings extends AppCompatActivity {
private static final String TAG = "SettingsActivity";
private RelativeLayout layout;
private SharedPreferences preferences;
private Bundle savedInstanceState;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
assert getSupportActionBar() != null;
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Spinner spinner = findViewById(DarkMode);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Log.e(TAG, "onItemSelected: " + position);
handleNightMode(position);
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
Log.e(TAG, "onNothingSelected: ");
}
});
}
private void handleNightMode(int position) {
switch (position) {
case 0:
Log.e(TAG, "Nothing Selected");
break;
case 1:
Log.e(TAG, "FOLLLOW_SYSTEM");
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
getDelegate().applyDayNight();
break;
case 2:
Log.e(TAG, "YES");
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
getDelegate().applyDayNight();
break;
case 3:
Log.e(TAG, "NO");
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
getDelegate().applyDayNight();
break;
case 4:
Log.e(TAG, "AUTO");
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY);
getDelegate().applyDayNight();
break;
default:
Log.e(TAG, "FOLLLOW_SYSTEM");
break;
}
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
String NightMode = preferences.getString("prefTheme", "NO");
if (NightMode.equals("YES"))
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
if (NightMode.equals("NO"))
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY);
else if (NightMode.equals("AUTO"))
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
the MainActivity:
public class MainActivity extends AppCompatActivity {
int currentDayNight;
private Button settings;
private RelativeLayout layout;
private SharedPreferences preferences;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
layout = findViewById(R.id.layout);
settings = findViewById(R.id.btn_settings);
currentDayNight = AppCompatDelegate.getDefaultNightMode();
settings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openSettings();
}
});
}
private void openSettings() {
Intent intent = new Intent(this, Settings.class);
startActivity(intent);
}
}
logcat:
04-16 21:31:59.861 11136-11136/? I/art: Not late-enabling -Xcheck:jni (already on)
04-16 21:32:00.033 11136-11136/com.goldenegg.darkmode W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter androidx.vectordrawable.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
04-16 21:32:00.086 11136-11136/com.goldenegg.darkmode I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$2>
04-16 21:32:00.087 11136-11136/com.goldenegg.darkmode I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$2>
04-16 21:32:00.168 11136-11149/com.goldenegg.darkmode I/art: Background partial concurrent mark sweep GC freed 523(79KB) AllocSpace objects, 0(0B) LOS objects, 50% free, 1007KB/2031KB, paused 6.320ms total 27.683ms
04-16 21:32:00.204 11136-11136/com.goldenegg.darkmode D/AndroidRuntime: Shutting down VM
--------- beginning of crash
04-16 21:32:00.205 11136-11136/com.goldenegg.darkmode E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.goldenegg.darkmode, PID: 11136
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.goldenegg.darkmode/com.goldenegg.darkmode.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.goldenegg.darkmode.MainActivity.onCreate(MainActivity.java:34)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Thanks for your Help.
have a great day
I am beginner and I had a test. I did all tasks, but I have a problem -
public class HttpTask extends AsyncTask<Integer, String, String> {####
ProgressDialog dialog;
Context context;
public HttpTask(Activity activity) {
//init progress dialog
dialog = new ProgressDialog(context);****
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
}
protected void onPreExecute() {
// show progress dialog
dialog.setMessage("Loading...");
dialog.setCancelable(false);
}
protected String doInBackground(Integer... params) {
//freeze system to 5 seconds
try {
int seconds = params[0]*5;####
TimeUnit.SECONDS.sleep(seconds);
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(final String success) {
// if there is progress dialog hide it
dialog.dismiss();
}
}
It crashes, when I try to compile it (I showed where are problems with * sign):
08-03 10:43:10.873 29441-29441/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:142)
at android.app.AlertDialog.<init>(AlertDialog.java:98)
at android.app.ProgressDialog.<init>(ProgressDialog.java:77)
at net.joerichard.androidtest.main.f.HttpTask.<init>(HttpTask.java:26)
at net.joerichard.androidtest.main.f.F_Networking_Activity$1.onClick(F_Networking_Activity.java:27)
at android.view.View.performClick(View.java:4107)
at android.view.View$PerformClick.run(View.java:17166)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5559)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1074)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:841)
at dalvik.system.NativeStart.main(Native Method)
08-03 10:43:10.913 754-877/? E/EmbeddedLogger﹕ App crashed! Process: net.joerichard.androidtest
08-03 10:43:10.913 754-877/? E/EmbeddedLogger﹕ App crashed! Package: net.joerichard.androidtest v1 (1.0)
08-03 10:43:10.913 754-877/? E/EmbeddedLogger﹕ Application Label: AndroidTest
This is class of main activity.
public class F_Networking_Activity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_f__networking_);
// bDownload: start HttpTask
Button bDownload = (Button) findViewById(R.id.bDownload);
bDownload.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
HttpTask task = new HttpTask(F_Networking_Activity.this);****
task.execute();
}
});
}
Thank you for your answers. Now I have another problem (I showed with # sign of second problems)
08-03 11:28:18.292 754-877/? E/EmbeddedLogger﹕ App crashed! Process: net.joerichard.androidtest'
08-03 11:28:18.292 754-877/? E/EmbeddedLogger﹕ App crashed! Package: net.joerichard.androidtest v1 (1.0)
08-03 11:28:18.292 754-877/? E/EmbeddedLogger﹕ Application Label: AndroidTest
08-03 11:28:18.292 30544-30726/? E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:864)
Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
at net.joerichard.androidtest.main.f.HttpTask.doInBackground(HttpTask.java:40)
at net.joerichard.androidtest.main.f.HttpTask.doInBackground(HttpTask.java:20)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:864)
Actually, your context is null because you didn't initialize it.
Add one extra line inside your HttpTask:
public HttpTask(Activity activity) {
this.context = activity;
dialog = new ProgressDialog(context);
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
}
and change Context to Activity like this:
Activity context;
Now call this context anywhere in your class.
Yes you must get NullPointer. Because your context is null.
Change this like
public HttpTask(Context _context) {
context = _context;
//init progress dialog
dialog = new ProgressDialog(context);****
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
}
I have been developing a weather app through Treehouse and unfortunately no one has been able to help me fix this perticular error.
For some reason no weather data is retrieved on the app. I signed up through forecast IO to get the weather data to the app but nothing appears and the app crashes.
I use my phone as an emulator but I receive no errors in the log. Only when I use the Android Studio emulator do I receive an error in the logcat. Any suggestions ?
Stormy app on gitHub
Github
MainActivity.java file
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.squareup.okhttp.Call;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import butterknife.ButterKnife;
import butterknife.InjectView;
public class MainActivity extends ActionBarActivity {
public static final String TAG = MainActivity.class.getSimpleName();
private CurrentWeather mCurrentWeather;
#InjectView(R.id.timeLabel) TextView mTimeLabel;
#InjectView(R.id.temperatureLabel) TextView mTemperatureLabel;
#InjectView(R.id.humidityValue) TextView mHumidityValue;
#InjectView(R.id.precipValue) TextView mPrecipValue;
#InjectView(R.id.summaryLabel) TextView mSummaryLabel;
#InjectView(R.id.iconImageView) ImageView mIconImageView;
#InjectView(R.id.refreshImageView) ImageView mRefreshImageView;
#InjectView(R.id.progressBar)ProgressBar mProgressBar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.inject(this);
mProgressBar.setVisibility(View.INVISIBLE);
final double latitude = 38.627;
final double longitude = -90.199;
mRefreshImageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getForecast(latitude, longitude);
}
});
getForecast(latitude, longitude);
Log.d(TAG, "Main UI code is running!");
}
private void getForecast(double latitude, double longitude) {
String apiKey = "8ec5f1674002ab5081cad28e9be10ced";
String forecastUrl = "https://api.forecast.io/forecast/" + apiKey +
"/" + latitude + "," + longitude;
if(isNetworkAvailable()) {
toggleRefresh();
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().
url(forecastUrl)
.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
#Override
public void onFailure(Request request, IOException e) {
toggleRefresh();
runOnUiThread(new Runnable() {
#Override
public void run() {
toggleRefresh();
}
});
alertUserAboutError();
}
#Override
public void onResponse(Response response) throws IOException {
runOnUiThread(new Runnable() {
#Override
public void run() {
toggleRefresh();
}
});
try {
String jsonData = response.body().string();
Log.v(TAG, response.body().string());
if (response.isSuccessful()) {
mCurrentWeather = getCurrentDetails(jsonData);
runOnUiThread(new Runnable() {
#Override
public void run() {
updateDisplay();
}
});
updateDisplay();
} else {
alertUserAboutError();
}
} catch (IOException e) {
Log.e(TAG, "Exception caught: ", e);
}
catch (JSONException e) {
Log.e(TAG, "Exception caught:", e);
}
}
});
}
else {
Toast.makeText(this, getString(R.string.network_unavailable_message),
Toast.LENGTH_LONG).show();
}
}
private void toggleRefresh() {
if (mProgressBar.getVisibility() == View.INVISIBLE) {
mProgressBar.setVisibility(View.VISIBLE);
mRefreshImageView.setVisibility(View.INVISIBLE);
} else {
mRefreshImageView.setVisibility(View.INVISIBLE);
mRefreshImageView.setVisibility(View.VISIBLE);
}
}
private void updateDisplay() {
mTemperatureLabel.setText(mCurrentWeather.getTemperature() + "");
mTimeLabel.setText("At" + mCurrentWeather.getFormattedTime() + " it will be");
mHumidityValue.setText(mCurrentWeather.getHumidity() + "");
mPrecipValue.setText(mCurrentWeather.getPrecipChance() + "%");
mSummaryLabel.setText(mCurrentWeather.getSummary());
Drawable drawable = getResources().getDrawable(mCurrentWeather.getIconId());
mIconImageView.setImageDrawable(drawable);
}
private CurrentWeather getCurrentDetails(String jsonData) throws JSONException {
JSONObject forecast = new JSONObject(jsonData);
String timezone = forecast.getString("timezone");
Log.i(TAG, "From JSON:" + timezone);
JSONObject currently = forecast.getJSONObject("currently");
CurrentWeather currentWeather = new CurrentWeather();
currentWeather.setHumidity(currently.getLong("time"));
currentWeather.setTime(currently.getLong("time"));
currentWeather.setIcon(currently.getString("icon"));
currentWeather.setPrecipChance(currently.getDouble("precipProbability"));
currentWeather.setTemperature(currently.getDouble("temperature"));
currentWeather.setTimeZone(timezone);
Log.d(TAG, currentWeather.getFormattedTime());
return new CurrentWeather();
}
private boolean isNetworkAvailable() {
ConnectivityManager manager = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
boolean isAvailable = false;
if(networkInfo != null && networkInfo.isConnected()) {
isAvailable = true;
}
return isAvailable;
}
private void alertUserAboutError() {
AlertDialogFragment dialog = new AlertDialogFragment();
dialog.show(getFragmentManager(), "error_dialog");
}
}
"PropertyFetcher: AdbCommandRejectedException getting properties for
device 0043d8b5c84ed1f5: device unauthorized.
Please check the confirmation dialog on your device."
Error log
02-10 14:17:31.130 52-52/? I/qemu-props﹕ received: qemu.hw.mainkeys=0
02-10 14:17:33.180 56-56/? I/SurfaceFlinger﹕ SurfaceFlinger's main thread ready to run. Initializing graphics H/W...
02-10 14:18:51.060 624-624/? D/AndroidRuntime﹕ Calling main entry com.android.commands.pm.Pm
02-10 14:19:01.630 548-548/com.android.launcher I/Choreographer﹕ Skipped 346 frames! The application may be doing too much work on its main thread.
02-10 14:19:02.750 437-437/? I/Choreographer﹕ Skipped 1210 frames! The application may be doing too much work on its main thread.
02-10 14:19:04.920 386-386/system_process W/BroadcastQueue﹕ Failure sending broadcast Intent { act=android.intent.action.TIME_TICK flg=0x50000014
(has extras) } android.os.TransactionTooLargeException
at android.os.BinderProxy.transact(Native Method)
at android.app.ApplicationThreadProxy.scheduleRegisteredReceiver(ApplicationThreadNative.java:1059)
at com.android.server.am.BroadcastQueue.performReceiveLocked(BroadcastQueue.java:421)
at com.android.server.am.BroadcastQueue.deliverToRegisteredReceiverLocked(BroadcastQueue.java:507)
at com.android.server.am.BroadcastQueue.processNextBroadcast(BroadcastQueue.java:714)
at com.android.server.am.ActivityManagerService.finishReceiver(ActivityManagerService.java:13807)
at android.content.BroadcastReceiver$PendingResult.sendFinished(BroadcastReceiver.java:419)
at android.content.BroadcastReceiver$PendingResult.finish(BroadcastReceiver.java:395)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:785)
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 com.android.server.ServerThread.initAndLoop(SystemServer.java:1093)
at com.android.server.SystemServer.main(SystemServer.java:1179)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
02-10 14:19:08.800 386-386/system_process I/Choreographer﹕ Skipped 34 frames! The application may be doing too much work on its main thread.
02-10 14:19:19.860 548-548/com.android.launcher I/Choreographer﹕ Skipped 1089 frames! The application may be doing too much work on its main thread.
02-10 14:19:23.320 718-718/com.android.systemui I/Choreographer﹕ Skipped 679 frames! The application may be doing too much work on its main thread.
02-10 14:19:25.100 718-718/com.android.systemui I/Choreographer﹕ Skipped 106 frames! The application may be doing too much work on its main thread.
02-10 14:19:27.700 718-718/com.android.systemui I/Choreographer﹕ Skipped 154 frames! The application may be doing too much work on its main thread.
02-10 14:19:30.720 548-548/com.android.launcher I/Choreographer﹕ Skipped 61 frames! The application may be doing too much work on its main thread.
02-10 14:19:57.300 893-893/? D/AndroidRuntime﹕ Calling main entry com.android.commands.am.Am
02-10 14:19:57.400 386-398/system_process I/ActivityManager﹕ START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=aurielvilaire.com.stormy/.MainActivity} from pid 893
02-10 14:19:57.890 386-714/system_process I/ActivityManager﹕ Start proc aurielvilaire.com.stormy for activity aurielvilaire.com.stormy/.MainActivity: pid=928 uid=10054 gids={50054, 3003}
02-10 14:20:00.640 928-928/aurielvilaire.com.stormy D/MainActivity﹕ Main UI code is running!
02-10 14:20:02.170 386-400/system_process I/ActivityManager﹕ Displayed aurielvilaire.com.stormy/.MainActivity: +4s339ms
02-10 14:20:05.540 928-943/aurielvilaire.com.stormy D/MainActivity﹕ 1:20 PM
02-10 14:20:05.600 928-943/aurielvilaire.com.stormy E/AndroidRuntime﹕ FATAL EXCEPTION: OkHttp Dispatcher Process: aurielvilaire.com.stormy, PID: 928 android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6094)
at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:824)
at android.view.View.requestLayout(View.java:16431)
at android.view.View.requestLayout(View.java:16431)
at android.view.View.requestLayout(View.java:16431)
at android.view.View.requestLayout(View.java:16431)
at android.view.View.requestLayout(View.java:16431)
at android.view.View.requestLayout(View.java:16431)
at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:352)
at android.view.View.requestLayout(View.java:16431)
at android.widget.TextView.checkForRelayout(TextView.java:6600)
at android.widget.TextView.setText(TextView.java:3813)
at android.widget.TextView.setText(TextView.java:3671)
at android.widget.TextView.setText(TextView.java:3646)
at aurielvilaire.com.stormy.MainActivity.updateDisplay(MainActivity.java:154)
at aurielvilaire.com.stormy.MainActivity.access$500(MainActivity.java:31)
at aurielvilaire.com.stormy.MainActivity$2.onResponse(MainActivity.java:122)
at com.squareup.okhttp.Call$AsyncCall.execute(Call.java:162)
at com.squareup.okhttp.internal.NamedRunnable.run(NamedRunnable.java:33)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
02-10 14:20:05.650 386-397/system_process W/ActivityManager﹕ Force finishing activity aurielvilaire.com.stormy/.MainActivity
02-10 14:20:05.710 386-414/system_process W/InputDispatcher﹕ channel 'b20c7078 aurielvilaire.com.stormy/aurielvilaire.com.stormy.MainActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x9
02-10 14:20:05.710 386-414/system_process E/InputDispatcher﹕ channel 'b20c7078 aurielvilaire.com.stormy/aurielvilaire.com.stormy.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
02-10 14:20:05.720 386-606/system_process W/InputDispatcher﹕ Attempted to unregister already unregistered input channel 'b20c7078 aurielvilaire.com.stormy/aurielvilaire.com.stormy.MainActivity (server)'
02-10 14:20:05.720 386-606/system_process I/WindowState﹕ WIN DEATH: Window{b20c7078 u0 aurielvilaire.com.stormy/aurielvilaire.com.stormy.MainActivity}
02-10 14:20:05.960 386-397/system_process I/WindowManager﹕ Screenshot max retries 4 of Token{b2051338 ActivityRecord{b207d380 u0 aurielvilaire.com.stormy/.MainActivity t2 f}} appWin=Window{b20c7078 u0 aurielvilaire.com.stormy/aurielvilaire.com.stormy.MainActivity EXITING} drawState=4
02-10 14:20:07.260 548-548/com.android.launcher I/Choreographer﹕ Skipped 59 frames! The application may be doing too much work on its main thread.
02-10 14:20:08.550 386-400/system_process W/WindowManager﹕ This window was lost: Window{b20c7078 u0 aurielvilaire.com.stormy/aurielvilaire.com.stormy.MainActivity}
02-10 14:20:08.550 386-400/system_process W/WindowManager﹕ mDisplayId=0 mSession=Session{b210e748 928:u0a10054}
mClient=android.os.BinderProxy#b2116298 mOwnerUid=10054
mShowToOwnerOnly=true package=aurielvilaire.com.stormy appop=NONE
mAttrs=WM.LayoutParams{(0,0)(fillxfill) sim=#120 ty=1 fl=#1810100
pfl=0x8 wanim=0x10302a1} Requested w=1080 h=1776 mLayoutSeq=71
mBaseLayer=21000 mSubLayer=0 mAnimLayer=21000+0=21000 mLastLayer=0
mToken=AppWindowToken{b208c460 token=Token{b2051338
ActivityRecord{b207d380 u0 aurielvilaire.com.stormy/.MainActivity
t2}}} mRootToken=AppWindowToken{b208c460 token=Token{b2051338
ActivityRecord{b207d380 u0 aurielvilaire.com.stormy/.MainActivity
t2}}} mAppToken=AppWindowToken{b208c460 token=Token{b2051338
ActivityRecord{b207d380 u0 aurielvilaire.com.stormy/.MainActivity
t2}}} mViewVisibility=0x0 mHaveFrame=true mObscured=true mSeq=0
mSystemUiVisibility=0x0 mPolicyVisibility=false
mPolicyVisibilityAfterAnim=false mAppOpVisibility=true
mAttachedHidden=false mGivenContentInsets=[0,0][0,0]
mGivenVisibleInsets=[0,0][0,0] mConfiguration={1.0 310mcc260mnc en_US
ldltr sw360dp w360dp h567dp 480dpi nrml port finger qwerty/v/v -nav/h
s.5} mHasSurface=true mShownFrame=[0.0,0.0][1080.0,1776.0]
isReadyForDisplay()=false mFrame=[0,0][1080,1776]
last=[0,0][1080,1776] mSystemDecorRect=[0,0][1080,1776]
last=[0,0][1080,1776] Frames: containing=[0,0][1080,1776]
parent=[0,0][1080,1776] display=[0,0][1080,1776]
overscan=[0,0][1080,1920] content=[0,75][1080,1776]
visible=[0,75][1080,1776] decor=[0,0][1080,1920] Cur insets:
overscan=[0,0][0,0] content=[0,75][0,0] visible=[0,75][0,0] Lst
insets: overscan=[0,0][0,0] content=[0,75][0,0] visible=[0,75][0,0]
WindowStateAnimator{b20db3d0
aurielvilaire.com.stormy/aurielvilaire.com.stormy.MainActivity}:
mSurface=Surface(name=aurielvilaire.com.stormy/aurielvilaire.com.stormy.MainActivity)
mDrawState=HAS_DRAWN mLastHidden=true Surface: shown=false layer=21005
alpha=0.0 rect=(0.0,0.0) 1080.0 x 1776.0 mShownAlpha=1.0 mAlpha=1.0
mLastAlpha=-1.0 mGlobalScale=1.0 mDsDx=1.0 mDtDx=0.0 mDsDy=0.0
mDtDy=1.0 mExiting=false mRemoveOnExit=false mDestroying=true
mRemoved=false
02-10 14:20:52.610 386-606/system_process I/ActivityManager﹕ Start proc com.android.email for broadcast com.android.email/.service.EmailBroadcastReceiver: pid=1049 uid=10024 gids={50024, 3003, 1028, 1015}
02-10 14:20:53.400 1049-1063/com.android.email D/ActivityThread﹕ Loading provider com.android.email.provider;com.android.email.notifier: com.android.email.provider.EmailProvider
02-10 14:20:58.452 386-583/system_process W/ActivityManager﹕ Unable to start service Intent { cmp=com.android.email/.service.AttachmentDownloadService } U=0: not found
02-10 14:20:58.522 1049-1103/com.android.email I/Email﹕Observing account changes for notifications
02-10 14:20:58.622 386-432/system_process I/ActivityManager﹕ Start proc com.android.exchange for service com.android.exchange/.service.EmailSyncAdapterService: pid=1104 uid=10025 gids={50025, 3003, 1028, 1015}
02-10 14:20:58.622 386-607/system_process W/ActivityManager﹕ Unable to start service Intent { cmp=com.android.email/.service.AttachmentDownloadService } U=0: not found
02-10 14:20:58.882 1049-1065/com.android.email D/dalvikvm﹕ GC_FOR_ALLOC freed 313K, 16% free 3359K/3960K, paused 231ms, total 254ms
02-10 14:21:49.352 718-718/com.android.systemui I/Choreographer﹕ Skipped 32 frames! The application may be doing too much work on its main thread.
After reading through that and looking at your code, I believe the main culprit here is that you are doing to much on the main thread. You should use the android AsyncTask to run especially network connections on a separate thread. For example you might use:
private class DownloadForecast extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... urls) {
getForecast(); //run all your network intensive methods
return response;
}
#Override
protected void onPostExecute(String result) {
//update all your UI stuff.
}
Can't seem to correctly intent the code. But thats what you should use. Good luck.
My problem is somewhat like these only... First and Second Question. I've tried everything given on these posts but to no relief.
So I am using android-simple-facebook library to create a facebook login. Here's my LoginActivity.java
public class LoginActivity extends Activity {
private Button mButtonLogin;
private SimpleFacebook mSimpleFacebook;
protected static final String TAG = LoginActivity.class.getName();
#Override
protected void onCreate(Bundle savedInstanceState) {
mSimpleFacebook = SimpleFacebook.getInstance();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
mButtonLogin = (Button) findViewById(R.id.button_login);
setLogin();
}
public void setLogin() {
final OnLoginListener onLoginListener = new OnLoginListener() {
#Override
public void onLogin() {
Log.i(TAG, "Logged in");
}
};
mButtonLogin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
mSimpleFacebook.login(onLoginListener);
}
});
}
#Override
public void onResume() {
super.onResume();
// mSimpleFacebook = SimpleFacebook.getInstance();
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
mSimpleFacebook.onActivityResult(this, requestCode, resultCode, data);
super.onActivityResult(requestCode, resultCode, data);
}
}
But as soon as i click the login button, the app crashes with NullPointerException. Here's the LogCat
09-21 15:54:40.109: E/AndroidRuntime(21895): FATAL EXCEPTION: main
09-21 15:54:40.109: E/AndroidRuntime(21895): Process: www.kb.com, PID: 21895
09-21 15:54:40.109: E/AndroidRuntime(21895): java.lang.NullPointerException
09-21 15:54:40.109: E/AndroidRuntime(21895): at www.kb.com.LoginActivity$2.onClick(LoginActivity.java:81)
09-21 15:54:40.109: E/AndroidRuntime(21895): at android.view.View.performClick(View.java:4438)
09-21 15:54:40.109: E/AndroidRuntime(21895): at android.view.View$PerformClick.run(View.java:18422)
09-21 15:54:40.109: E/AndroidRuntime(21895): at android.os.Handler.handleCallback(Handler.java:733)
09-21 15:54:40.109: E/AndroidRuntime(21895): at android.os.Handler.dispatchMessage(Handler.java:95)
09-21 15:54:40.109: E/AndroidRuntime(21895): at android.os.Looper.loop(Looper.java:136)
09-21 15:54:40.109: E/AndroidRuntime(21895): at android.app.ActivityThread.main(ActivityThread.java:5001)
09-21 15:54:40.109: E/AndroidRuntime(21895): at java.lang.reflect.Method.invokeNative(Native Method)
09-21 15:54:40.109: E/AndroidRuntime(21895): at java.lang.reflect.Method.invoke(Method.java:515)
09-21 15:54:40.109: E/AndroidRuntime(21895): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
09-21 15:54:40.109: E/AndroidRuntime(21895): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
09-21 15:54:40.109: E/AndroidRuntime(21895): at dalvik.system.NativeStart.main(Native Method)
Please check if you are using the correct API-call. The API documentation states for getInstance()
/**
* Get the instance of {#link SimpleFacebook}. <br>
* <br>
* <b>Important:</b> Use this method only after you initialized this library
* or by: {#link #initialize(Activity)} or by {#link #getInstance(Activity)}
*
* #return The {#link SimpleFacebook} instance
*/
public static SimpleFacebook getInstance() {
return mInstance;
}
I did not see a call like initialize(Activity) or getInstance(Activity) in your code snippet.
As it turns out there was nothing wrong with the code or the library, but was an issue with android support lib. I finally found the solution here
I know that the stop method has been deprecated and I am using destroy now, but I get this error:
11-09 11:42:28.740: E/AndroidRuntime(1538): FATAL EXCEPTION: main
11-09 11:42:28.740: E/AndroidRuntime(1538): java.lang.NoSuchMethodError: Thread.destroy()
11-09 11:42:28.740: E/AndroidRuntime(1538): at java.lang.Thread.destroy(Thread.java:600)
11-09 11:42:28.740: E/AndroidRuntime(1538): at com.rathbones.src.NewslettersActivity.onKeyDown(NewslettersActivity.java:144)
11-09 11:42:28.740: E/AndroidRuntime(1538): at android.view.KeyEvent.dispatch(KeyEvent.java:1037)
11-09 11:42:28.740: E/AndroidRuntime(1538): at android.app.Activity.dispatchKeyEvent(Activity.java:2068)
11-09 11:42:28.740: E/AndroidRuntime(1538): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1643)
11-09 11:42:28.740: E/AndroidRuntime(1538): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2471)
11-09 11:42:28.740: E/AndroidRuntime(1538): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2441)
11-09 11:42:28.740: E/AndroidRuntime(1538): at android.view.ViewRoot.handleMessage(ViewRoot.java:1735)
11-09 11:42:28.740: E/AndroidRuntime(1538): at android.os.Handler.dispatchMessage(Handler.java:99)
11-09 11:42:28.740: E/AndroidRuntime(1538): at android.os.Looper.loop(Looper.java:123)
11-09 11:42:28.740: E/AndroidRuntime(1538): at android.app.ActivityThread.main(ActivityThread.java:4627)
11-09 11:42:28.740: E/AndroidRuntime(1538): at java.lang.reflect.Method.invokeNative(Native Method)
11-09 11:42:28.740: E/AndroidRuntime(1538): at java.lang.reflect.Method.invoke(Method.java:521)
11-09 11:42:28.740: E/AndroidRuntime(1538): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-09 11:42:28.740: E/AndroidRuntime(1538): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-09 11:42:28.740: E/AndroidRuntime(1538): at dalvik.system.NativeStart.main(Native Method)
11-09 11:42:28.760: W/ActivityManager(59): Force finishing activity com.rathbones.src/.NewslettersActivity
The application is not crashing, it's just that I get this error in logcat.
Actually I have a newsletter module which enables users to view the PDF file. When they press the view button it opens up a progress bar and in the same time if someone presses the backbutton it should stop the thread and exit gracefully. It does that but in the log I get the above error.
Here is the code snippet causing this error:
private void viewOnline() {
if (currentNewsletter == null) {
Log.e(Constants.APP_NAME, "No newsletter selected");
return;
}
final ProgressDialog d = new ProgressDialog(this);
d.setMessage("Downloading...");
d.show();
final Context context = getApplicationContext();
t = new Thread(new Runnable() {
public void run() {
String fileName = currentNewsletter.mFilename;
Log.d(Constants.APP_NAME, "Downloading/showing: " + fileName);
final File file = Utilities.getFileFromURL(context, currentNewsletter.mUrl, currentNewsletter.mExpectedSizeInBytes, fileName, false);
d.dismiss();
// Now we can show the file
viewPDF(file);
}
});
t.start();
// Utilities.List(getApplicationContext().getFilesDir().getPath());
// Utilities.List(getApplicationContext().getDir("files", Context.MODE_WORLD_WRITEABLE).getAbsolutePath());
// Utilities.DeleteDirectory(getApplicationContext().getDir("files", Context.MODE_WORLD_WRITEABLE).getAbsolutePath());
}
private void viewPDF(File file) {
//DEBUG DEBUG DEBUG
//Log.d(Constants.APP_NAME, "ViewPDF: showing " + file.getName());
//Log.d(Constants.APP_NAME, "Path: " + file.getPath());
//Log.d(Constants.APP_NAME, "Exists: " + file.exists());
//Log.d(Constants.APP_NAME, "Length: " + file.length());
//DEBUG DEBUG DEBUG
// Now it's all safe and sound and local, open it
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/pdf");
try {
startActivity(intent);
} catch (Exception e) {
Toast.makeText(this, "No Application Available to View PDF", Toast.LENGTH_SHORT).show();
}
}
#Override
protected void onStop() {
finish();
super.onStop();
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
t.destroy();
Intent i = new Intent(NewslettersActivity.this,MainMenuActivity.class);
startActivity(i);
finish();
return true;
}
return super.onKeyDown(keyCode, event);
}
If you have a thread with a while loop inside, you can control this thread by a boolean flag for the while condition. When you set the flag to false the thread just finishes its task.
Here's a little example:
boolean flag = true;
Thread secondary = new Thread(new Runnable() {
#Override
public void run() {
while (flag) {
// do something
}
}
});
secondary.start(); //start the thread
flag = false; // this will force secondary to finish its execution
try {
secondary.join(); // wait for secondary to finish
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
I will found this code in SO and it also works for me.
Use interrupt() instead of destroy().
To the user370305 answer, maybe two changes could help:
Use AtomicBoolean instead boolean, if the Thread runs in another core, changes could not be visible for flag.
Remove the throw new RuntimeException(e) within the catch. It will crash as you are throwing an Exception.