I have just begun writing some code for my Chat app after days of planning but the problem is that keeps on crashing right after the Gradle Build has finished and the app is installed on my device. I have created a button that is expected to open a new activity but instead of doing so it crashes. Everything works before I have written any code, the app opens and logcat doesn't show any errors. Here is the error:
2022-08-10 19:26:48.372 15348-15348/? E/e.myapplicatio: Unknown bits set in runtime_flags: 0x40000000
2022-08-10 19:26:48.391 15348-15348/? E/RefClass: java.lang.reflect.InvocationTargetException
2022-08-10 19:26:48.474 15348-15348/com.example.myapplication E/Perf: perftest packageName : com.example.myapplication App is allowed to use Hide APIs
2022-08-10 19:26:48.515 15348-15374/com.example.myapplication E/libEGL: Invalid file path for libcolorx-loader.so
2022-08-10 19:26:48.528 15348-15348/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 15348
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3628)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3887)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:140)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:100)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2317)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:263)
at android.app.ActivityThread.main(ActivityThread.java:8292)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:183)
at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:174)
at android.content.Context.obtainStyledAttributes(Context.java:744)
at androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor(AppCompatDelegateImpl.java:848)
at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:815)
at androidx.appcompat.app.AppCompatDelegateImpl.findViewById(AppCompatDelegateImpl.java:640)
at androidx.appcompat.app.AppCompatActivity.findViewById(AppCompatActivity.java:259)
at com.example.myapplication.MainActivity.<init>(MainActivity.java:12)
at java.lang.Class.newInstance(Native Method)
at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45)
at android.app.Instrumentation.newActivity(Instrumentation.java:1254)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3616)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3887)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:140)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:100)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2317)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:263)
at android.app.ActivityThread.main(ActivityThread.java:8292)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006)
I tried following some other suggestions but they didn't work. Here's the snippet of my code:
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
public Button signUp = findViewById(R.id.signUpBtn);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
signUp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
openActivity();
}
});
}
public void openActivity(){
Intent intent = new Intent(this, LoginActivity.class);
startActivity(intent);
}
}
You can not use findViewById() outside of onCreate() like this and if you really wanna do that, do it by creating a new method for setting up IDs and then add that method in onCreate().
this code will do the work now:
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
public Button signUp;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
signUp = findViewById(R.id.signUpBtn);
signUp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
openActivity();
}
});
}
public void openActivity(){
Intent intent = new Intent(this, LoginActivity.class);
startActivity(intent);
}
}
Below i have pasted the code of MainActivity
package com.example.tunifi;
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import com.karumi.dexter.Dexter;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionDeniedResponse;
import com.karumi.dexter.listener.PermissionGrantedResponse;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.single.PermissionListener;
import java.io.File;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
ListView listView;
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.listView);
Dexter.withContext(this)
.withPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
.withListener(new PermissionListener() {
#Override
public void onPermissionGranted(PermissionGrantedResponse permissionGrantedResponse) {
//Toast.makeText(MainActivity.this, "Runtime permission given !", Toast.LENGTH_SHORT).show();
ArrayList<File> mySongs = fetchSongs(Environment.getExternalStorageDirectory());
String [] items = new String[mySongs.size()];
for (int i=0;i<mySongs.size();i++){
items[i] = mySongs.get(i).getName().replace(".mp3","");
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_expandable_list_item_1,items);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this, PlaySong.class);
String currentSong = listView.getItemAtPosition(position).toString();
intent.putExtra("SongList",mySongs);
intent.putExtra("CurrentSong",currentSong);
intent.putExtra("Position",position);
startActivity(intent);
}
});
}
#Override
public void onPermissionDenied(PermissionDeniedResponse permissionDeniedResponse) {
}
#Override
public void onPermissionRationaleShouldBeShown(PermissionRequest permissionRequest, PermissionToken permissionToken) {
permissionToken.continuePermissionRequest();
}
})
.check();
}
public ArrayList<File> fetchSongs(File file){
ArrayList arrayList = new ArrayList();
File [] songs = file.listFiles();
if (songs != null){
for (File myFile : songs){
if (!myFile.isHidden() && myFile.isDirectory()){
arrayList.addAll(fetchSongs(myFile));
}
else{
if (myFile.getName().endsWith(".mp3") && !myFile.getName().startsWith(".")){
arrayList.add(myFile);
}
}
}
}
return arrayList;
}
}
Below i have pasted the code of PlaySong
package com.example.tunifi;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;
import java.io.File;
import java.util.ArrayList;
public class PlaySong extends AppCompatActivity {
TextView textView;
ImageView previous, play, next;
ArrayList<File> songs;
MediaPlayer mediaPlayer;
String textContent;
int position;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_play_song);
textView = findViewById(R.id.textView);
previous = findViewById(R.id.previous);
play = findViewById(R.id.play);
next = findViewById(R.id.next);
Intent intent = getIntent();
Bundle bundle = intent.getExtras();
songs = (ArrayList) bundle.getParcelableArrayList("songs");
textContent = intent.getStringExtra("CurrentSong");
textView.setText(textContent);
position = intent.getIntExtra("Position",0);
Uri uri = Uri.parse(songs.get(position).toString());
mediaPlayer = MediaPlayer.create(this,uri);
mediaPlayer.start();
}
}
This is what my Logcat shows:
2021-08-13 13:05:25.898 23725-23725/? I/zygote: Not late-enabling -Xcheck:jni (already on)
2021-08-13 13:04:58.820 1538-23594/? I/AudioFlinger: AudioFlinger's thread 0xb1903c80 tid=23594 ready to run
2021-08-13 13:05:25.917 23725-23725/? W/zygote: Unexpected CPU variant for X86 using defaults: x86
2021-08-13 13:03:30.914 1697-2352/system_process W/ActivityManager: Slow operation: 566ms so far, now at getContentProviderImpl: done!
2021-08-13 13:05:25.898 23725-23725/? I/zygote: Not late-enabling -Xcheck:jni (already on)
2021-08-13 13:05:25.917 23725-23725/? W/zygote: Unexpected CPU variant for X86 using defaults: x86
2021-08-13 13:05:25.898 23725-23725/? I/zygote: Not late-enabling -Xcheck:jni (already on)
2021-08-13 13:05:25.917 23725-23725/? W/zygote: Unexpected CPU variant for X86 using defaults: x86
2021-08-13 13:05:26.244 23725-23749/com.example.tunifi D/OpenGLRenderer: HWUI GL Pipeline
2021-08-13 13:05:26.331 23725-23749/com.example.tunifi I/OpenGLRenderer: Initialized EGL, version 1.4
2021-08-13 13:05:26.332 23725-23749/com.example.tunifi D/OpenGLRenderer: Swap behavior 1
2021-08-13 13:05:26.334 23725-23749/com.example.tunifi W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
2021-08-13 13:05:26.334 23725-23749/com.example.tunifi D/OpenGLRenderer: Swap behavior 0
2021-08-13 13:05:26.382 23725-23749/com.example.tunifi D/EGL_emulation: eglCreateContext: 0xa0385120: maj 2 min 0 rcv 2
2021-08-13 13:05:26.405 23725-23749/com.example.tunifi D/EGL_emulation: eglMakeCurrent: 0xa0385120: ver 2 0 (tinfo 0xa0383280)
2021-08-13 13:05:26.544 23725-23749/com.example.tunifi D/EGL_emulation: eglMakeCurrent: 0xa0385120: ver 2 0 (tinfo 0xa0383280)
2021-08-13 13:05:28.347 23725-23725/com.example.tunifi D/AndroidRuntime: Shutting down VM
2021-08-13 13:05:28.351 23725-23725/com.example.tunifi E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.tunifi, PID: 23725
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tunifi/com.example.tunifi.PlaySong}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.util.ArrayList.get(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.util.ArrayList.get(int)' on a null object reference
at com.example.tunifi.PlaySong.onCreate(PlaySong.java:38)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Can someone please help me out in finding what is wrong and how to correct it, sice i am new to this android development world and i am really upset for this thing since i am trying from many days to correct it,but nothing is working. Thank You So Much in advance !
The trick is to read the stacktrace, it says :
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.util.ArrayList.get(int)' on a null object reference
So looks like songs is null when you try to get a value of that list, can you make sure that songs is initialized before calling the
Uri uri = Uri.parse(songs.get(position).toString());
Edit
Perhaps this is not the root cause of your bug but you are doing this
intent.putExtra("SongList",mySongs);
looks like you are sending your song list with this bundle name "SongList" but then you are trying to retrieve it with :
songs = (ArrayList) bundle.getParcelableArrayList("songs");
I guess it should be "SongList" instead of "songs"
change
songs = (ArrayList) bundle.getParcelableArrayList("songs");
to
songs = (ArrayList) bundle.getParcelableArrayList("SongList");
Uri uri = Uri.parse(songs.get(position).toString());
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.util.ArrayList.get(int)' on a null object reference
from this error,we can know the this arraylist is null,you should check it first
The problem is that, during transition from firstActivity to thisServiceActivity, the screen will freeze and then turn black. If service has performed it process and send the broadcast and receive by the broadcast receiver of thisServiceActivity, then it will finally show the layout of the thisServiceActivity and quickly transition to ResultActivity.
Is it because there is something I do wrong in its UI thread? I try to find similar discussion to this problem but can't find it.
firstActivity class will start a new activity which is thisServiceActivity class. thisServiceActivity have a layout that show a progressbar and textview. At the same time, it will start a service class name as myForegroundService with pending intent notification.
If the process in the service completed, the service will send a local broadcast that will be pickup by thisServiceActivity using broadcast receiver and it then stop the service and transition to resultActivity and finish its activity.
public class firstActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first_activity);
}
//using button onclick
public void startActivity(View view) {
Intent startService = new Intent(this, thisServiceActivity.class);
startActivity(startService);
}
}
package example.myapplication;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
public class thisServiceActivity extends AppCompatActivity {
Intent goToResult, stopMyService, startMyService;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_this_service);
LocalBroadcastManager.getInstance(this).registerReceiver(myForegroundReceiver,
new IntentFilter("end-of-process"));
startService();
}
public void startService() {
startMyService = new Intent(this, myForegroundService.class);
ContextCompat.startForegroundService(this, startMyService);
}
public void stopService() {
stopMyService = new Intent(this, myForegroundService.class);
stopService(stopMyService);
}
#Override
protected void onDestroy() {
LocalBroadcastManager.getInstance(this).unregisterReceiver(myForegroundReceiver);
super.onDestroy();
}
private BroadcastReceiver myForegroundReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
Log.i("onReceive", "Received");
stopService();
goToResult = new Intent(getApplication(), ResultActivity.class);
startActivity(goToResult);
finish();
}
};
}
package example.myapplication;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.IBinder;
import android.os.SystemClock;
import android.util.Log;
import androidx.annotation.Nullable;
import androidx.core.app.NotificationCompat;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import java.util.concurrent.ExecutionException;
import static example.myapplication.App.CHANNEL_ID;
public class myForegroundService extends Service {
Boolean process;
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("Service Running", "True");
Intent toThisServiceActivity = new Intent(this, thisServiceActivity.class);
PendingIntent servicePendingIntent = PendingIntent.getActivity(this, 0, toThisServiceActivity, 0);
Notification notify = new NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("Sit back and relax, process is in progress")
.setContentText("You look more charming if you have patient, please wait")
.setContentIntent(servicePendingIntent)
.build();
startForeground(1, notify);
try {
process = new MyLoop().execute().get();
} catch (ExecutionException | InterruptedException e) {
e.printStackTrace();
}
if (process) {
Intent killswitch = new Intent("end-of-process");
Log.i("Finish", "Service");
LocalBroadcastManager.getInstance(this).sendBroadcast(killswitch);
}
return START_NOT_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
}
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
private class MyLoop extends AsyncTask<Void, String, Boolean> {
#Override
protected Boolean doInBackground(Void... voids) {
for (int i = 0; i < 10; i++) {
publishProgress("i = " + i);
SystemClock.sleep(1000);
}
return true;
}
#Override
protected void onProgressUpdate(String... values) {
String value = values[0];
Log.i("Foreground Service", value);
}
}
}
Logcat output
02/25 17:41:41: Launching 'app' on Google.
$ adb shell am start -n "example.myapplication/example.myapplication.firstActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Waiting for process to come online...
Connected to process 5060 on device '-google-192.168.42.106:5555'.
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
I/Zygote: seccomp disabled by setenforce 0
I/e.myapplicatio: Late-enabling -Xcheck:jni
W/e.myapplicatio: Unexpected CPU variant for X86 using defaults: x86
D/libEGL: Emulator has host GPU support, qemu.gles is set to 1.
I/example.myapplication: type=1400 audit(0.0:1122): avc: denied { write } for comm=45474C20496E6974 name="property_service" dev="tmpfs" ino=9335 scontext=u:r:untrusted_app:s0:c96,c256,c512,c768 tcontext=u:object_r:property_socket:s0 tclass=sock_file permissive=1
type=1400 audit(0.0:1123): avc: denied { connectto } for comm=45474C20496E6974 path="/dev/socket/property_service" scontext=u:r:untrusted_app:s0:c96,c256,c512,c768 tcontext=u:r:init:s0 tclass=unix_stream_socket permissive=1
D/vndksupport: Loading /vendor/lib/egl/libGLES_emulation.so from current namespace instead of sphal namespace.
E/libEGL: load_driver(/vendor/lib/egl/libGLES_emulation.so): dlopen failed: library "/vendor/lib/egl/libGLES_emulation.so" not found
D/vndksupport: Loading /vendor/lib/egl/libEGL_emulation.so from current namespace instead of sphal namespace.
D/libEGL: loaded /vendor/lib/egl/libEGL_emulation.so
D/vndksupport: Loading /vendor/lib/egl/libGLESv1_CM_emulation.so from current namespace instead of sphal namespace.
D/libEGL: loaded /vendor/lib/egl/libGLESv1_CM_emulation.so
D/vndksupport: Loading /vendor/lib/egl/libGLESv2_emulation.so from current namespace instead of sphal namespace.
D/libEGL: loaded /vendor/lib/egl/libGLESv2_emulation.so
W/e.myapplicatio: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (light greylist, reflection)
W/e.myapplicatio: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (light greylist, reflection)
D/OpenGLRenderer: Skia GL Pipeline
D/: HostConnection::get() New Host Connection established 0xe7b6d5c0, tid 5087
I/RenderThread: type=1400 audit(0.0:1124): avc: denied { connectto } for path=006C6F63616C5F6F70656E676C scontext=u:r:untrusted_app:s0:c96,c256,c512,c768 tcontext=u:r:local_opengl:s0 tclass=unix_stream_socket permissive=1
W/: Unrecognized GLES max version string in extensions:
W/: Process pipe failed
I/ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasHDRDisplay retrieved: 0
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
D/EGL_emulation: eglCreateContext: 0xe1fc8e20: maj 2 min 0 rcv 2
D/vndksupport: Loading /vendor/lib/hw/android.hardware.graphics.mapper#2.0-impl.so from current namespace instead of sphal namespace.
D/vndksupport: Loading /vendor/lib/hw/gralloc.vbox86.so from current namespace instead of sphal namespace.
E/EGL_emulation: tid 5087: eglSurfaceAttrib(1354): error 0x3009 (EGL_BAD_MATCH)
W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xe1fc8d60, error=EGL_BAD_MATCH
I/Choreographer: Skipped 31 frames! The application may be doing too much work on its main thread.
W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy#112c025
E/EGL_emulation: tid 5087: eglSurfaceAttrib(1354): error 0x3009 (EGL_BAD_MATCH)
W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xe0846b60, error=EGL_BAD_MATCH
I/Service Running: True
I/Finish: Service
W/ViewRootImpl[thisServiceActivity]: Dropping event due to no window focus: KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_BACK, scanCode=0, metaState=0, flags=0x48, repeatCount=0, eventTime=7949110, downTime=7949110, deviceId=-1, source=0x101 }
W/ViewRootImpl[thisServiceActivity]: Cancelling event due to no window focus: KeyEvent { action=ACTION_UP, keyCode=KEYCODE_BACK, scanCode=0, metaState=0, flags=0x68, repeatCount=0, eventTime=7950511, downTime=7949110, deviceId=-1, source=0x101 }
I/Choreographer: Skipped 625 frames! The application may be doing too much work on its main thread.
I/chatty: uid=10096(example.myapplication) identical 7 lines
W/ViewRootImpl[thisServiceActivity]: Cancelling event due to no window focus: KeyEvent { action=ACTION_UP, keyCode=KEYCODE_BACK, scanCode=0, metaState=0, flags=0x68, repeatCount=0, eventTime=7950511, downTime=7949110, deviceId=-1, source=0x101 }
I/OpenGLRenderer: Davey! duration=10603ms; Flags=0, IntendedVsync=7941734767100, Vsync=7952151433350, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=7952160308707, AnimationStart=7952160414256, PerformTraversalsStart=7952161151710, DrawStart=7952165102838, SyncQueued=7952174190092, SyncStart=7952180127743, IssueDrawCommandsStart=7952180180543, SwapBuffers=7952293099225, FrameCompleted=7952343853615, DequeueBufferDuration=63000, QueueBufferDuration=161000,
I/Foreground Service: i = 0
i = 1
I/Foreground Service: i = 2
i = 3
I/OpenGLRenderer: Davey! duration=10618ms; Flags=0, IntendedVsync=7941734767100, Vsync=7952151433350, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=7952160308707, AnimationStart=7952160414256, PerformTraversalsStart=7952161151710, DrawStart=7952344526709, SyncQueued=7952345327938, SyncStart=7952355852722, IssueDrawCommandsStart=7952355900616, SwapBuffers=7952356170648, FrameCompleted=7952363877516, DequeueBufferDuration=148000, QueueBufferDuration=246000,
I/Foreground Service: i = 4
I/Foreground Service: i = 5
i = 6
i = 7
i = 8
I/Foreground Service: i = 9
I/onReceive: Received
Process 5060 terminated.
You're blocking the UI thread for 10 seconds by waiting for the result of your AsyncTask:
process = new MyLoop().execute().get();
The Javadoc for get() states:
Waits if necessary for the computation to complete, and then retrieves its result.
This is eliminating any advantage to running it on a background thread and causing your app to freeze. If you need to do something with the result, you should do it in AsyncTask.onPostExecute.
App crashes while clicking button I made a simple app which share its apk file while clicked the button.
I want to implement it in my primary app but don't know whats the error
package com.studenthelper.share;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.io.File;
public class MainActivity extends AppCompatActivity {
Button shr;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
shr = (Button) findViewById(R.id.but);
shr.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ApplicationInfo api = getApplicationContext().getApplicationInfo();
String filePath = api.sourceDir;
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("application/vnd.android.package-archive");
intent.putExtra(Intent.EXTRA_STREAM,
Uri.fromFile(new File(filePath)));
startActivity(Intent.createChooser(intent, "Share Using"));
}
});
}
}
log
2020-03-01 17:26:53.758 4741-4741/com.studenthelper.share E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.studenthelper.share, PID: 4741
android.os.FileUriExposedException: file:///data/app/com.studenthelper.share-s51_qOKFxmQ8bo6zuBgGow%3D%3D/base.apk exposed beyond app through ClipData.Item.getUri()
at android.os.StrictMode.onFileUriExposed(StrictMode.java:1978)
at android.net.Uri.checkFileUriExposed(Uri.java:2371)
at android.content.ClipData.prepareToLeaveProcess(ClipData.java:963)
at android.content.Intent.prepareToLeaveProcess(Intent.java:10228)
at android.content.Intent.prepareToLeaveProcess(Intent.java:10234)
at android.content.Intent.prepareToLeaveProcess(Intent.java:10213)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1669)
at android.app.Activity.startActivityForResult(Activity.java:4590)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:676)
at android.app.Activity.startActivityForResult(Activity.java:4548)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:663)
at android.app.Activity.startActivity(Activity.java:4909)
at android.app.Activity.startActivity(Activity.java:4877)
at com.studenthelper.share.MainActivity$1.onClick(MainActivity.java:33)
at android.view.View.performClick(View.java:6605)
at android.view.View.performClickInternal(View.java:6582)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25897)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6692)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
2020-03-01 17:26:53.787 4741-4741/com.studenthelper.share I/Process: Sending signal. PID: 4741 SIG: 9
android.os.FileUriExposedException is raised for newer APIs because the file URI scheme of newer APIs is different than that of old APIs.
To solve this replace the below line of code:
intent.putExtra(Intent.EXTRA_STREAM,
Uri.fromFile(new File(filePath)));
With:
intent.putExtra(Intent.EXTRA_STREAM,
Uri.parse(filePath));
This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 4 years ago.
Hello my question is about my app is crash after I am trying to hit next fragment.
Code is compiling but i don't know how to solve this problem.
Something with onclicklistner.
I tried some solutions but didn't succeed.
This is my code:
ProfileFragment.java
package com.statusionew.statusio.fragments;
import android.app.ProgressDialog; import android.content.Intent; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v7.widget.Toolbar; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button;
import com.google.firebase.auth.FirebaseAuth; import com.google.firebase.auth.FirebaseUser; import com.statusionew.statusio.ForgetchangePasswordActivity; import com.statusionew.statusio.LoginActivity; import com.statusionew.statusio.R; import com.statusionew.statusio.MainActivity;
import butterknife.BindView; import butterknife.ButterKnife; import butterknife.OnClick;
public class ProfileFragment extends BaseFragment implements View.OnClickListener{
FirebaseAuth auth;
FirebaseUser user;
ProgressDialog PD;
#BindView(R.id.sign_out_button) Button btnSignOut;
#BindView(R.id.change_password_button) Button btnChangePass;
#BindView(R.id.change_email_button) Button btnChangeEmail;
#BindView(R.id.delete_user_button) Button btnDeleteUser;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.activity_setting, container, false);
ButterKnife.bind(getActivity(), view);
((MainActivity) getActivity()).updateToolbarTitle("Profile");
return view;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
auth = FirebaseAuth.getInstance();
user = auth.getCurrentUser();
PD = new ProgressDialog(getActivity());
PD.setMessage("Loading...");
PD.setCancelable(true);
PD.setCanceledOnTouchOutside(false);
btnSignOut.setOnClickListener(new View.OnClickListener() {
#Override
#OnClick(R.id.sign_out_button)
public void onClick(View view) {
auth.signOut();
FirebaseAuth.AuthStateListener authListener = new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user == null) {
Intent intent = new Intent(getActivity(), LoginActivity.class);
startActivity(intent);
}
}
};
}
});
btnChangePass.setOnClickListener(new View.OnClickListener() {
#Override
#OnClick(R.id.change_password_button)
public void onClick(View view) {
startActivity(new Intent(getActivity().getApplicationContext(), ForgetchangePasswordActivity.class).putExtra("Mode", 1));
}
});
btnChangeEmail.setOnClickListener(new View.OnClickListener() {
#Override
#OnClick(R.id.change_email_button)
public void onClick(View view) {
startActivity(new Intent(getActivity().getApplicationContext(), ForgetchangePasswordActivity.class).putExtra("Mode", 2));
}
});
btnDeleteUser.setOnClickListener(new View.OnClickListener() {
#Override
#OnClick(R.id.delete_user_button)
public void onClick(View view) {
startActivity(new Intent(getActivity().getApplicationContext(), ForgetchangePasswordActivity.class).putExtra("Mode", 3));
}
});
}
#Override
public void onClick(View v) {
if (auth.getCurrentUser() == null) {
startActivity(new Intent(getActivity(), LoginActivity.class));
getActivity().finish();
}
super.onResume();
} }
this the log that say 'Attempt to invoke virtual method'-
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.statusionew.statusio, PID: 9206
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.statusionew.statusio.fragments.ProfileFragment.onCreate(ProfileFragment.java:65)
at android.support.v4.app.Fragment.performCreate(Fragment.java:2339)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1377)
at android.support.v4.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1109)
at android.support.v4.app.FragmentTransition.calculateFragments(FragmentTransition.java:996)
at android.support.v4.app.FragmentTransition.startTransitions(FragmentTransition.java:99)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2364)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:781)
at com.statusionew.statusio.views.FragNavController.executePendingTransactions(FragNavController.java:631)
at com.statusionew.statusio.views.FragNavController.switchTab(FragNavController.java:142)
at com.statusionew.statusio.views.FragNavController.switchTab(FragNavController.java:158)
at com.statusionew.statusio.MainActivity.switchTab(MainActivity.java:149)
at com.statusionew.statusio.MainActivity.access$100(MainActivity.java:30)
at com.statusionew.statusio.MainActivity$1.onTabSelected(MainActivity.java:87)
at android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:1165)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1158)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1128)
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1427)
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1537)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Connected to process 10580 on device emulator-5554
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
I/art: Not late-enabling -Xcheck:jni (already on)
W/art: Unexpected CPU variant for X86 using defaults: x86
W/System: ClassLoader referenced unknown path: /data/app/com.statusionew.statusio-1/lib/x86
D/FirebaseApp: com.google.firebase.crash.FirebaseCrash is not linked. Skipping initialization.
V/FA: Registered activity lifecycle callback
I/FirebaseInitProvider: FirebaseApp initialization successful
I/InstantRun: starting instant run server: is main process
E/InstantRun: IO Error creating local socket at com.statusionew.statusio
java.io.IOException: Address already in use
at android.net.LocalSocketImpl.bindLocal(Native Method)
at android.net.LocalSocketImpl.bind(LocalSocketImpl.java:308)
at android.net.LocalServerSocket.<init>(LocalServerSocket.java:48)
at com.android.tools.ir.server.Server.<init>(Server.java:91)
at com.android.tools.ir.server.Server.create(Server.java:85)
at com.android.tools.ir.server.InstantRunContentProvider.onCreate(InstantRunContentProvider.java:49)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1751)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1726)
at android.app.ActivityThread.installProvider(ActivityThread.java:5853)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:5445)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5384)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1545)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
It seems like you've got some misunderstandings about how Fragments and ButterKnife work.
OnCreate is called BEFORE onCreateView in a Fragment. So all your views are null when you're trying to access them in onCreate.
See Fragment Lifecycle:
https://www.tutorialspoint.com/android/images/fragment.jpg
OnCreate is not used that much in Fragments, onCreateView is used more.
Your ButterKnife bind code is also wrong. You're trying to bind the Activity to the views in the Fragment.
See ButterKnife documentation for correct usage: http://jakewharton.github.io/butterknife/