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Android inApp immediate update

I'm about to launch my app.
I wrote a code for inApp immediate update since I want everyone who downloaded my app to update when I upload updated version.
I wonder if this code will work without causing any problem.
mAppUpdateManager = AppUpdateManagerFactory.create( this );
Task<AppUpdateInfo> appUpdateInfoTask = mAppUpdateManager.getAppUpdateInfo();
appUpdateInfoTask.addOnSuccessListener( new OnSuccessListener<AppUpdateInfo>() {
#Override
public void onSuccess(AppUpdateInfo result) {
if (result.updateAvailability() == UpdateAvailability.UPDATE_AVAILABLE
&& result.isUpdateTypeAllowed( AppUpdateType.IMMEDIATE )){
try {
mAppUpdateManager.startUpdateFlowForResult( result, AppUpdateType.IMMEDIATE, MainActivity.this, MY_REQUEST_CODE );
} catch (IntentSender.SendIntentException e) {
Log.e( "AppUpdater", "AppUpdateManager Error", e );
e.printStackTrace();}
}else {}
}
} );

Please mention the issue you're facing. Meanwhile you can use this library to introduce in-app updates in your app. It's pretty simple to use and tested properly.
https://github.com/sohanzz/Easy-InApp-Updater

Changing Flash setting of Android Camera 2 at runtime

Basically, what I am trying to do is change the CONTROL_AE_MODE by button click in the app. The user can use AUTO flash(ON_AUTO_FLASH), turn if ON(ON_ALWAYS_FLASH), or OFF(CONTROL_AE_MODE_OFF).
In this example: https://github.com/googlesamples/android-Camera2Basic/blob/master/Application/src/main/java/com/example/android/camera2basic/Camera2BasicFragment.java
Line 818, they set the flash once:
// Use the same AE and AF modes as the preview.
captureBuilder.set(CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
setAutoFlash(captureBuilder);
// Orientation
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
CameraCaptureSession.CaptureCallback CaptureCallback
= new CameraCaptureSession.CaptureCallback() {
#Override
public void onCaptureCompleted(#NonNull CameraCaptureSession session,
#NonNull CaptureRequest request,
#NonNull TotalCaptureResult result) {
showToast("Saved: " + mFile);
Log.d(TAG, mFile.toString());
unlockFocus();
}
};
mCaptureSession.stopRepeating();
mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);
And then builds the CaptureSession at line 840.
Is there a way to change the CONTROL_AE_MODE after the preview is made?
I have tried remaking the session, which kinda worked:
if(flashMode == CameraView.CAMERA_FLASH_ON){
Log.e("CAMERA 2", "FLASH ON");
mPreviewCaptureRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_ALWAYS_FLASH);
}else if(flashMode == CameraView.CAMERA_FLASH_OFF){
Log.e("CAMERA 2", "FLASH OFF");
mPreviewCaptureRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
}else if(flashMode == CameraView.CAMERA_FLASH_AUTO){
Log.e("CAMERA 2", "FLASH AUTO");
mPreviewCaptureRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
}
mFlashMode = flashMode;
if (mCameraCaptureSession != null) {
mCameraCaptureSession.close();
mCameraCaptureSession = null;
}
createCameraPreviewSession();
For some reason, CONTROL_AE_MODE_OFF would turn the whole preview black.
I tried looking in the docs for methods to update but haven't found anything.
Any tutorials or docs is much appreciated.

As mentioned by #cyborg86pl when switching flash modes you should not switch CONTROL_AE_MODE . Instead you can switch between FLASH_MODE´s. Here is a working example for my case:
when (currentFlashState) {
FlashState.AUTO -> {
previewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH)
}
FlashState.ON -> {
previewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON)
previewRequestBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_TORCH)
}
FlashState.OFF -> {
previewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON)
previewRequestBuilder.set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_OFF)
}
}
previewRequest = previewRequestBuilder.build()
captureSession.setRepeatingRequest(previewRequest, captureCallback, backgroundHandler)

I don't know why your preview turn black, but you don't need to close capture session manually. From .close() method's docs:
Using createCaptureSession(List , CameraCaptureSession.StateCallback,
Handler) directly without closing is the recommended approach for
quickly switching to a new session, since unchanged target outputs can
be reused more efficiently.
So you can reuse existing CaptureRequest.Builder, set your changed value, build new PreviewRequest and just start new session with this new request, like this:
try {
// Change some capture settings
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
// Build new request (we can't just edit existing one, as it is immutable)
mPreviewRequest = mPreviewRequestBuilder.build();
// Set new repeating request with our changed one
mCaptureSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
It will be much faster (almost without any visible freeze of preview).

What you want is disabling flash, not auto-exposure (AE), thus you want to use CONTROL_AE_MODE_ON rather than CONTROL_AE_MODE_OFF.
As mentioned in the documentation:
CONTROL_AE_MODE_ON
The camera device's autoexposure routine is active, with no flash control.

Google Drive for Android SDK Doesn't List Files

I've got a really odd problem with the Google Drive Android SDK. I've been using it for several months now, and until last week it performed perfectly. However, there is now a really odd error, which doesn't occur all the time but does 9 out of 10 times.
I'm trying to list the user's files and folders stored in a particular Google Drive folder. When I'm trying to use the method Drive.files().list().execute(), 9 out of 10 times literally nothing happens. The method just hangs, and even if I leave it for an hour, it just remains doing... nothing.
The code I'm using is below - all of this being run within the doInBackground of an AsyncTask. I've checked credentials - they are all fine, as is the app's certificate's SHA1 hash. No exceptions are thrown. Google searches have yielded nothing. Here is the particular bit of code that's bothering me:
try {
GoogleAccountCredential credential = GoogleAccountCredential.usingOAuth2(
SettingsActivity.this, Arrays.asList(DriveScopes.DRIVE));
if (googleAccountName != null && googleAccountName.length() > 0) {
credential.setSelectedAccountName(googleAccountName);
Drive service = new Drive.Builder(AndroidHttp.newCompatibleTransport(),
new GsonFactory(), credential).build();
service.files().list().execute(); // Google Drive fails here
} else {
// ...
}
} catch (final UserRecoverableAuthIOException e) {
// Authorisation Needed
runOnUiThread(new Runnable() {
#Override
public void run() {
try {
startActivityForResult(e.getIntent(), REQUEST_AUTHORISE_GDRIVE);
} catch (Exception e) {
Log.e("SettingsActivity: Google Drive", "Unable to add Google Drive account due to Exception after trying to show the Google Drive authroise request intent, as the UserRecoverableIOException was originally thrown. Error message:\n" + e.getMessage());
}
}
});
Log.d("SettingsActivity: Google Drive", "UserRecoverableAuthIOException when trying to add Google Drive account. This is normal if this is the first time the user has tried to use Google Drive. Error message:\n" + e.getMessage());
return;
} catch (Exception e) {
Log.e("SettingsActivity: Google Drive", "Unable to add Google Drive account. Error message:\n" + e.getMessage());
return;
}
I'm using Drive API v2. Thanks everyone!
Edit
Having played around a bit more, it turns out this isn't for just listing files. Trying to interact with any file on Google Drive behaves the same way - deleting, downloading, creating... Anything! I have also noticed that putting the device in aeroplane mode so it has not internet access makes no difference either: Google Drive doesn't throw an exception, or even return, it just freezes the thread it's on.
I've updated to the very latest Drive API lib but that hasn't helped. I remembered that the error happened soon after I added the JSch SSH library to the project, so I removed that, but it made no difference. Removing and re-adding the Drive API v2 has made no difference either, and nor has cleaning the project.
Edit 2
I've found something which may be significant. On the Google Developer console, I had some Drive errors recorded as follows:
TOP ERRORS:
Requests % Requests Methods Error codes
18 38.30% drive.files.list 400
14 29.79% drive.files.insert 500
11 23.40% drive.files.update 500
4 8.51% drive.files.get 400
Do you reckon these are the errors? How could I fix them? Thanks

This is my code and it's work
new AsyncTask<Void, Void, List<File>>() {
#Override
protected List<File> doInBackground(Void... params) {
List<File> result = new ArrayList<File>();
try {
com.google.api.services.drive.Drive.Files.List list = service.files().list();
list.setQ("'" + sourcePath + "' in parents");
FileList fileList = list.execute();
result = fileList.getItems();
if(result != null) {
return result;
}
} catch (UserRecoverableAuthIOException e) {
startActivityForResult(e.getIntent(), REQUEST_AUTHORIZATION);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(List<File> result) {
//This is List file from Google Drive
};
}.execute();

I've come up with a solution which does work, and thought I'd post it so others could see it if they happen to come across the problem.
Luckily, I had backed up all of the previous versions of the app. So I restored the whole project to how it was two weeks ago, copied and pasted all changes from the newer version which had been made since then, and it worked. I don't see why this should work, since the end result is the same project, but it does!

Google Drive List Files
This might help you.. Try to display it in ListView u will see all fetched folders
public void if_db_updated(Drive service)
{
try {
Files.List request = service.files().list().setQ("mimeType = 'application/vnd.google-apps.folder'");
FileList files = request.execute();
for(File file : files.getItems())
{
String title = file.getTitle();
showToast(title);
}
} catch (UserRecoverableAuthIOException e) {
startActivityForResult(e.getIntent(), REQUEST_AUTHORIZATION);
} catch (IOException e) {
e.printStackTrace();
}
}
public void showToast(final String toast) {
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(), toast, Toast.LENGTH_SHORT).show();
}
});

How to force app uninstall in order to update?

I did a mistake that apparently can be solved only by uninstalling and then installing my app again.
I delivered a message to the users, but no-one seems to uninstall it.
AFAIK, if I change the certificate file, the play store won't let me upload the application, and
obviously I don't want to upload a new app.
Is there a way to force uninstall in order to update?
Thanks!

There's no killswitch to remotely force uninstalls (that'd be a security nightmare). What you can do is publish a fixed version on Google Play, and wait for users to upgrade.

I don't know if this can help you but i had the same problem. The solution for me is that i check the app version every time the user opens it and compare it with a version code stored on apache server (in a checkversion.php file).
If versions doesn't match, i show a not cancelable dialog that ask the user to go to market and download the update.
Here is an example (keep in mind that i use Volley library to handle connections):
public class UpdateManager {
private Activity ac;
private HashMap<String,String> params;
public UpdateManager(Activity ac) {
this.ac = ac;
}
public void checkForUpdates() {
Log.d("UpdateManager","checkForUpdates() - Started...");
params = new HashMap<String,String>();
params.put("request","checkforupdates");
try {
params.put("versioncode", String.valueOf(ac.getPackageManager().getPackageInfo(ac.getPackageName(), 0).versionCode));
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (Helper.isInternetAvailable(ac)) { //this is a class i made to check internet connection availability
checkAppVersion();
} else { Log.d("UpdateManager","CheckForUpdates(): Impossible to update version due to lack of connection"); }
}
private void checkAppVersion() {
Log.d("UpdateManager","checkAppVersion() - Request started...");
JsonObjectRequest req = new JsonObjectRequest("http://yourserver/checkappversion.php", new JSONObject(params),
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
if (response != null && response.has("result")) {
try {
Log.d("UpdateManager","checkAppVersion() - Request finished - Response: "+response.getString("result"));
if (response.getString("result").matches("updaterequested")) { //Update requested. Show the relative dialog
Log.d("UpdateManager","Update requested");
askUserForUpdate();
}
else if (response.getString("result").matches("current")) { //Same version. Do nothing
Log.d("UpdateManager","Version is up to date");
}
else if (response.getString("result").matches("error")) { //You can return an error message if error occurred on server
Log.d("UpdateManager","checkappversion Error - "+response.getString("error"));
}
VolleyLog.v("Response:%n %s", response.toString(4));
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("UpdateManager","Volley Error - "+error.getMessage());
}
});
req.setRetryPolicy(new DefaultRetryPolicy(60000,0,DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
ConnectionController.getInstance().addToRequestQueue(req);
}
public void askUserForUpdate() {
final Dialog diag = new Dialog(ac);
diag.requestWindowFeature(Window.FEATURE_NO_TITLE);
diag.setContentView(R.layout.updatemanager_requestupdate_dialog);
diag.setCancelable(false);
diag.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
TextView t = (TextView)diag.findViewById(R.id.requestupdate_dialog_main_text);
ImageView im_ok = (ImageView)diag.findViewById(R.id.requestupdate_dialog_ok);
ImageView im_canc = (ImageView)diag.findViewById(R.id.requestupdate_dialog_canc);
t.setText(ac.getResources().getString(R.string.update_manager_askuserforupdate));
im_canc.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
diag.dismiss();
ac.finish();
}
});
im_ok.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id="+ac.getPackageName()));
diag.dismiss();
ac.startActivity(intent);
ac.finish();
}
});
diag.show();
}
}
You can then use it when your main activity (or maybe login activity) starts like this:
UpdateManager updateManager = new UpdateManager(MainActivity.this); //i assume MainActicity as the calling activity
updateManager.checkForUpdates();
Obviously this has to be implemented into the application code so, the first time, you have to rely only on the user to manually upgrade it. But this can help if you have the same problem in the future.
This is an extract from my personal code so you have to rearrange it to your needings. Hope this helps someone.

Users should be able to go to Settings > Applications > Manage Applications and select the application to be removed. I've never seen a case where the application can't be removed this way, except in the case of built-in applications which require a rooted device to remove.

How to Change Screen Resolution Programmatically?

Let me tell you my problem. I want to change my screen resolution.
I can change it in an application but it changes only application's
screen. I wanna set system's resolution so it won't be important which
application is running on front. My device's resolution is set as 1280
* 720 p. Can I make it 1260 * 680? If it requires to make changes in
Android source code, I can. Just tell me where to change. Waiting for
your help.

This thread on xda-developers should set you on the right track.

Searching too a valid answer to this, but I have a lead to the solution :
WARNING Experimental buggy stuff :
/*
Requires android.permission.WRITE_SETTINGS
and android.permission.WRITE_SECURE_SETTINGS, thus it requires the app to be a system app.
*/
public void changeResolution(int x, int y){
try { Class c = Class.forName("android.os.ServiceManager");
try { Method method = c.getDeclaredMethod("checkService", String.class);
try {
IWindowManager mWindowManager = IWindowManager.Stub.asInterface((IBinder) method.invoke(null,Context.WINDOW_SERVICE));
try { mWindowManager.setForcedDisplaySize(Display.DEFAULT_DISPLAY,x,y);
} catch (RemoteException e) {e.printStackTrace();}
} catch (IllegalAccessException e) {e.printStackTrace();}
catch (InvocationTargetException e) {e.printStackTrace();}
} catch (NoSuchMethodException e) {e.printStackTrace();}
} catch (ClassNotFoundException e) {e.printStackTrace();}
}
Add a reduced AIDL version of IWindowManager to your project :
/app/src/main/aidl/android/view/IWindowManager.aidl
package android.view;
interface IWindowManager
{
boolean startViewServer(int port); // Transaction #1
boolean stopViewServer(); // Transaction #2
boolean isViewServerRunning(); // Transaction #3
void setForcedDisplaySize(int displayId, int width, int height);
void clearForcedDisplaySize(int displayId);
void setForcedDisplayDensity(int displayId, int density);
void clearForcedDisplayDensity(int displayId);
}
The app will require to be in the system apps folder.
It does something for sure, but right now it also lead to severe bugs.
Rebooting seems to cancel changes.
Waiting for feedback on this.

If you are using Windows and know how to use JNI, Microsoft provides C++ Win32 function calls to do this: ChangeDisplaySettingsEx() and EnumDisplaySettings().