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App crash in Android Studio 4 emulator while testing recording and play

I've met with problems while testing a recording app on the emulator(Pixel 3a API 30)
Below is the Java code that I searched for in the tutorial on Youtube.
In the video it can be tested normally.
When it comes to me, it kept crashing when I hit on the stop recording button.
//Request Runtime Permission
if (!checkPermissionFromDevice())
requestPermission();
//Init view
pl_btn = (Button)findViewById(R.id.play_btn);
rcrd_btn = (Button)findViewById(R.id.record_button);
stp_rcrd_btn = (Button)findViewById(R.id.stop_record_btn);
ps_btn = (Button)findViewById(R.id.pause_btn);
//From Android M, need request Run-time permission
rcrd_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (checkPermissionFromDevice()) {
pathSave = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/"
+ UUID.randomUUID().toString() + "audio_record.3gp";
setupMediaRecorder();
try {
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IOException e) {
e.printStackTrace();
}
pl_btn.setEnabled(false);
ps_btn.setEnabled(false);
rcrd_btn.setEnabled(false);
stp_rcrd_btn.setEnabled(true);
Toast.makeText(recording_and_play_test.this, "Recording...", Toast.LENGTH_SHORT).show();
} else {
requestPermission();
}
}
});
stp_rcrd_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mediaRecorder.stop();
stp_rcrd_btn.setEnabled(false);
pl_btn.setEnabled(true);
rcrd_btn.setEnabled(true);
ps_btn.setEnabled(false);
}
});
pl_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ps_btn.setEnabled(true);
stp_rcrd_btn.setEnabled(false);
rcrd_btn.setEnabled(false);
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(pathSave);
mediaPlayer.prepare();
}catch (IOException e){
e.printStackTrace();
}
mediaPlayer.start();
Toast.makeText(recording_and_play_test.this, "Playing...", Toast.LENGTH_SHORT).show();
}
});
ps_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
stp_rcrd_btn.setEnabled(false);
rcrd_btn.setEnabled(true);
pl_btn.setEnabled(true);
ps_btn.setEnabled(false);
if (mediaPlayer != null){
mediaPlayer.stop();
mediaPlayer.release();
setupMediaRecorder();
}
}
});
}
private void setupMediaRecorder() {
mediaRecorder = new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
mediaRecorder.setOutputFile(pathSave);
}
private void requestPermission() {
ActivityCompat.requestPermissions(this, new String[]{
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.RECORD_AUDIO
},REQUEST_PERMISSION_CODE);
}
And here's what the activity looks like
While I hit the stop recording button while executing the recording function, the app then just crashed and restarts again.
Here's what the build log says
E/MediaRecorder: stop called in an invalid state: 4
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.adrsingingscope, PID: 7309
java.lang.IllegalStateException
at android.media.MediaRecorder.stop(Native Method)
at com.example.adrsingingscope.recording_and_play_test$2.onClick(recording_and_play_test.java:88)
at android.view.View.performClick(View.java:7448)
at android.view.View.performClickInternal(View.java:7425)
at android.view.View.access$3600(View.java:810)
at android.view.View$PerformClick.run(View.java:28305)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

This could be a problem with the path you created to save a file. These things can be easy to mess up. The media recorder has its own state and STATE 4 in which your app crashed in the state of recording. So it didn't stop and something happened in between that process so I assume it is related to saving your file to external storage.
You can find MEDIA_RECORDER_STATES here: https://android.googlesource.com/platform/frameworks/av/+/android-4.2.2_r1.2/include/media/mediarecorder.h#96
There are three things you can try.
Change your save file path
Try changing your path to a different directory. Sometimes you are trying to reach the directory you are not allowed to or it doesn't exist. More you can read in this answer: https://stackoverflow.com/a/33107120/14759470
Check your AndroidManifest.xml for permissions
Check if you wrote your permissions in AndroidManifest.xml as you should. You need WRITE_EXTERNAL_STORAGE and RECORD_AUDIO for this. In your code, it even says that from Android M (6.0) you need RUN_TIME permission. So just add them on top of your manifest file if you didn't.
Make your code better
Don't stop the recorder if it's already stopped. This will throw an exception. Don't release if already released, also an exception, and so on. So test your code for bugs, make breakpoints, and find your weak spots. It will be easier for you to find your errors. Also, check the log for more error messages since this one doesn't give us much.

I can't start torch in device with API <=22(Used Android Studio and Unity) .why?

Hi friends I'm trying to make torch application in unity.From documentation I have noticed that setTorchMode() is applicable only if we have API>22. It works fine for API>22.But for below API<23 I have followed this. But even though my application in not staring torch in API<23 . From Logcat I have traced that CameraService: Permission Denial: can't use the camera
Detail Error Report:
08-18 09:27:22.343 758-835/? I/ActivityManager: Killing
14121:com.google.android.partnersetup/u0a7 (adj 15): DHA:empty #19
08-18 09:27:22.343 196-2615/? W/ServiceManager: Permission failure:
android.permission.CAMERA from uid=10242 pid=14010
08-18 09:27:22.343 196-2615/? E/CameraService: Permission Denial: can't
use the camera pid=14010, uid=10242
08-18 09:27:22.343 14010-14051/? W/CameraBase: An error occurred while
connecting to camera: 0
08-18 09:27:22.353 14010-14051/? E/ContentValues: TorchMode:
java.lang.RuntimeException: Fail to connect to camera service
`enter code here`at android.hardware.Camera.<init>(Camera.java:568)
at android.hardware.Camera.open(Camera.java:426)
at
com.mugames.torchlibrary.AndroidTrochClass.TorchMode
(AndroidTrochClass.java:64)
at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
at com.unity3d.player.UnityPlayer.access$300(Unknown Source)
at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:145)
at com.unity3d.player.UnityPlayer$e.run(Unknown Source)
Here is my C# (Unity Code)
private void Awake()
{
if(!Permission.HasUserAuthorizedPermission(Permission.Camera))
{
Permission.RequestUserPermission(Permission.Camera);
}
}
void Start()
{
AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
AndroidJavaObject context = activity.Call<AndroidJavaObject>("getApplicationContext");
javaObject = new AndroidJavaObject("com.mugames.torchlibrary.AndroidTrochClass");
javaObject.Call("Init", context);
javaObject.Call("TorchMode", true);
}
Also Here is my Java code(Name of JAVA class is AndroidTrochClass) for API<23
try {
if(camera== null && parameters==null) {
camera = Camera.open();
parameters = camera.getParameters();
List<String> modesAvailable = parameters.getSupportedFlashModes();
if (modesAvailable.contains(Camera.Parameters.FLASH_MODE_TORCH)) {
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
} else if (modesAvailable.contains((Camera.Parameters.FLASH_MODE_ON))) {
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
} else {
Log.d("Unity", "No Flash Available");
}
camera.setParameters(parameters);
}
if (state) {
camera.startPreview();
} else {
camera.stopPreview();
}
}
catch (Exception e)
{
Log.e(TAG, "TorchMode: ",e);
e.printStackTrace();
}
NOTE: I'm using Java Class Just as Plugin So Java Class extend to nothing so I have passed current context to Java Methods

Found!! I need to add Camera permission in manifest file ;)

java.lang.IllegalStateException: AssetManager has been finalized

I went to sleep yesterday with my app working and today when I tried to run it won't start at all. As soon as I try to open it crashes with a java.lang.IllegalStateException. I've gone several commits back in my code just to rule out it was something I did recently and still. This makes no sense, how can an app just stop working over night? I've looked for the error in the internet and there is not a lot of useful information about it. Is this really an odd error?
Here's the complete stack trace:
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.IllegalStateException: AssetManager has been finalized!
at android.os.Parcel.readException(Parcel.java:1439)
at android.os.Parcel.readException(Parcel.java:1385)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1947)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1419)
at android.app.Activity.startActivityForResult(Activity.java:3390)
at android.app.Activity.startActivity(Activity.java:3583)
at com.android.launcher2.Launcher.startActivity(Launcher.java:2442)
at com.android.launcher2.Launcher.startActivitySafely(Launcher.java:2469)
at com.android.launcher2.AppsCustomizePagedView.onClick(AppsCustomizePagedView.java:584)
at android.view.View.performClick(View.java:4240)
at android.view.View$PerformClick.run(View.java:17721)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5136)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Since like I said it doesn't seem to be anything that I did I'm not sure what code to post. But given that the app crashes on start here's the code for the two main classes that are supposed to start first:
App
public class App extends Application {
private static App instance;
private static final String TAG = "Starter";
#Override
public void onCreate() {
super.onCreate();
instance = this;
// Enable Local Datastore.
Parse.enableLocalDatastore(this);
//TODO: Register subclasses
// ParseObject.registerSubclass(Challenge.class);
//Parse server
Log.d(TAG, "Initializing Parse");
Parse.initialize(new Parse.Configuration.Builder(this)
.applicationId(getString(R.string.parse_app_id))
.clientKey(getString(R.string.parse_client_key))
.server(getString(R.string.server_address)).build()
);
//Facebook
if (AccessToken.getCurrentAccessToken() == null)
ParseFacebookUtils.initialize(this);
ParseUser.enableAutomaticUser();
ParseACL defaultACL = new ParseACL();
// Optionally enable public read access.
defaultACL.setPublicReadAccess(true);
defaultACL.setPublicWriteAccess(true);
ParseACL.setDefaultACL(defaultACL, true);
Log.d(TAG, "Parse ready");
}
public static App getInstance(){
return instance;
}
}
SplashActivity
public class SplashActivity extends AppCompatActivity {
private static final String TAG = "Splash";
private boolean firstTime = true;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide title bar
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_splash);
firstTime = getSharedPreferences(Constants.GENERAL_SHARED_PREFS, MODE_PRIVATE)
.getBoolean(Constants.FIRSTTIME, true);
if (isLoggedIn())
if (firstTime)
startActivity(new Intent(SplashActivity.this, FirstTimeActivity.class));
else
startActivity(new Intent(SplashActivity.this, MenuActivity.class));
else {
Log.d(TAG, "Calling Home");
startActivity(new Intent(SplashActivity.this, WelcomeActivity.class));
finish();
}
}
#Override
protected void onResume() {
super.onResume();
}
#Override
protected void onPause() {
super.onPause();
}
#Override
protected void onDestroy() {
super.onDestroy();
}
public boolean isLoggedIn() {
AccessToken accessToken = AccessToken.getCurrentAccessToken();
String parseSession = ParseUser.getCurrentUser().getSessionToken();
return parseSession != null;
}
}

Your stacktrace links to this class in the AOSP.
I think this crash has nothing to do with your app, but as an error in the Launcher class. Try installing from USB debugging and see if that works.
But there are still some details that are blurry. These lines are (from bottom of the stacktrace to the top) the lines that cause problems in com.android.launcher2 package:
https://android.googlesource.com/platform/packages/apps/Launcher2/+/android-4.2.2_r1/src/com/android/launcher2/AppsCustomizePagedView.java#584
https://android.googlesource.com/platform/packages/apps/Launcher2/+/master/src/com/android/launcher2/Launcher.java#2469
https://android.googlesource.com/platform/packages/apps/Launcher2/+/master/src/com/android/launcher2/Launcher.java#2442
From this error, I assume you are using a Nexus or Pixel (or any device with the unaltered source code, meaning stock android.).
From what I can tell from this error, this is not an error related to your app. It appears to be an issue with the launcher you are using. Try installing from USB debugging, or change launcher, and see if that works. Try rebooting your device as well.
Further, from what I see of your code, there are no parcelable classes in use

This error can also be caused when Instant Run loses connection with the Android Emulator as a result of which new app changes are not persisted in the emulator.
Running the app again will solve the issue.

FATAL EXCEPTION: main on Android App

I'm getting this fatal exception: main error. It is only when I click on the 'Pick A Place' button on my app.
The logcat report when clicking on the 'Pick A Place' button is below:
04-13 13:52:19.418 10737-10737/cct.mad.lab E/AndroidRuntime: FATAL EXCEPTION: main
Process: cct.mad.lab, PID: 10737
java.lang.NoSuchMethodError: cct.mad.lab.SettingsActivity.checkSelfPermission
at cct.mad.lab.SettingsActivity.calculateCurrentCoordinates(SettingsActivity.java:679)
at cct.mad.lab.SettingsActivity.onPrepareDialog(SettingsActivity.java:581)
at android.app.Activity.onPrepareDialog(Activity.java:3061)
at android.app.Activity.showDialog(Activity.java:3124)
at android.app.Activity.showDialog(Activity.java:3075)
at cct.mad.lab.SettingsActivity$8.onClick(SettingsActivity.java:374)
at android.view.View.performClick(View.java:4438)
at android.view.View$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)
The logcat points to a 'NoSuchMethodError' when checking for 'self permission' to do with the method 'calculateCurrentCooridnates'. This method is below:
#TargetApi(Build.VERSION_CODES.M)
private void calculateCurrentCoordinates() {
float lat = 0, lon = 0;
try {
LocationManager locMgr = (LocationManager) getSystemService(LOCATION_SERVICE);
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// Activity#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for Activity#requestPermissions for more details.
return;
}
Location recentLoc = locMgr.getLastKnownLocation(LocationManager.GPS_PROVIDER);
lat = (float) recentLoc.getLatitude();
lon = (float) recentLoc.getLongitude();
} catch (Exception e) {
Log.e(DEBUG_TAG, "Location failed", e);
}
mFavPlaceCoords = new GPSCoords(lat, lon);
}
The ToDo was automatically generated when Android Studio automatically added the '#TargetAPI' bit. With this in mind I added the following to the manifest and as I got no more errors I thought this would be enough:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
However, the app just crashes.
Any help greatly appreciated.
Thanks

Extending AppCompatActivity will solve the issue.

Do like this
public class SettingsActivity extends AppCompatActivity {

Android Manifest Permissions issues

I followed a tutorial online about how to create a simple app that can switch on and off your phone's cam-light.
<manifest....>
<uses-permission android:name = "android.permission.CAMERA"/>
<uses-feature android:name = "android.hardware.camera"/>
</manifest>
This is in android manifest.
The problem: it crashes when I press the ON button (made by me, in application)
Stack Trace:
07-17 22:27:13.990: E/AndroidRuntime(1775): FATAL EXCEPTION: main
07-17 22:27:13.990: E/AndroidRuntime(1775): java.lang.NullPointerException
07-17 22:27:13.990: E/AndroidRuntime(1775): at com.example.salpa.MainActivity$1.onClick(MainActivity.java:33)
07-17 22:27:13.990: E/AndroidRuntime(1775): at android.view.View.performClick(View.java:4204)
07-17 22:27:13.990: E/AndroidRuntime(1775): at android.view.View$PerformClick.run(View.java:17355)
07-17 22:27:13.990: E/AndroidRuntime(1775): at android.os.Handler.handleCallback(Handler.java:725)
Another strange thing: when I install the app, there are no details about what permissions is requiring.
"The application can acces the following on your phone:" and there's nothing. (despite the permissions in tutorial where it shows that the application needs permision to Camera.)
Can someone please help me, thanks.
setContentView(R.layout.activity_main);
Button aprinde =(Button)findViewById(R.id.aprinde);
//Button sting = (Button)findViewById(R.id.sting);
cameraObj = Camera.open();
aprinde.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view){
Camera.Parameters cameraParams = cameraObj.getParameters();
cameraParams.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
cameraObj.setParameters(cameraParams);
cameraObj.startPreview();
}
} );

Your app is crashing because you are running it on an emulator, which doesn't have a back-facing camera.
The documentation for Camera#open():
Creates a new Camera object to access the first back-facing camera on the
device. If the device does not have a back-facing camera, this returns
null.
You can fix the crash by checking for null.
public void onClick(View v) {
if (cameraObj == null) {
return;
}
Camera.Parameters cameraParams = cameraObj.getParameters();
cameraParams.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
cameraObj.setParameters(cameraParams);
cameraObj.startPreview();
}
You should also look out for setParameters as this could crash too if the device doesn't have a flash.
public void onClick(View v) {
if (cameraObj == null) {
return;
}
Camera.Parameters cameraParams = cameraObj.getParameters();
if (cameraParams.getFlashMode() == null) {
return;
}
cameraParams.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
cameraObj.setParameters(cameraParams);
cameraObj.startPreview();
}