@Override
protected void onCreate(Bundle savedInstanceState) {
    try{
        super.onCreate(savedInstanceState);
        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());
     }catch (Exception ex){    }
    guncelle();
}

private AppUpdateManager mAppUpdateManager;
private static final int RC_APP_UPDATE = 11;

public void guncelle() {
    try{
        mAppUpdateManager = AppUpdateManagerFactory.create(this);
        mAppUpdateManager.registerListener(installStateUpdatedListener);
        mAppUpdateManager.getAppUpdateInfo().addOnSuccessListener(appUpdateInfo -> {

            if (appUpdateInfo.updateAvailability() == UpdateAvailability.UPDATE_AVAILABLE
                    && appUpdateInfo.isUpdateTypeAllowed(AppUpdateType.FLEXIBLE /*AppUpdateType.IMMEDIATE*/)){
                try {
            mAppUpdateManager.startUpdateFlowForResult(
              appUpdateInfo, AppUpdateType.FLEXIBLE /*AppUpdateType.IMMEDIATE*/, MainActivity.this, RC_APP_UPDATE);

                } catch (IntentSender.SendIntentException e) {
                    e.printStackTrace();
                }

            } else if (appUpdateInfo.installStatus() == InstallStatus.DOWNLOADED){
                //CHECK THIS if AppUpdateType.FLEXIBLE, otherwise you can skip
                popupSnackbarForCompleteUpdate();
            } else {
                Log.e("TAG", "checkForAppUpdateAvailability: something else");
            }
        });

    }catch (Exception ex){    }}

@Override
protected void onStop() {
    if (mAppUpdateManager != null) {
        mAppUpdateManager.unregisterListener(installStateUpdatedListener);
    }
    super.onStop();
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RC_APP_UPDATE) {
        if (resultCode != RESULT_OK) {
            Toast.makeText(mainActivity, "İptal Edildi", Toast.LENGTH_SHORT).show();
        }
    }
}
private void popupSnackbarForCompleteUpdate() {

    Snackbar snackbar =
            Snackbar.make(findViewById(android.R.id.content),
                    "Yeni Güncelleme Hazır!",
                    Snackbar.LENGTH_INDEFINITE);

    snackbar.setAction("YÜKLE", view -> {
        if (mAppUpdateManager != null){
            mAppUpdateManager.completeUpdate();
        }
    });


    snackbar.setActionTextColor(getResources().getColor(R.color.acik_sari));
    snackbar.show();
}

InstallStateUpdatedListener installStateUpdatedListener = new
        InstallStateUpdatedListener() {
            @Override
            public void onStateUpdate(InstallState state) {
                if (state.installStatus() == InstallStatus.DOWNLOADED){
                    //CHECK THIS if AppUpdateType.FLEXIBLE, otherwise you can skip
                    popupSnackbarForCompleteUpdate();
                } else if (state.installStatus() == InstallStatus.INSTALLED){
                    if (mAppUpdateManager != null){
                        mAppUpdateManager.unregisterListener(installStateUpdatedListener);
                    }

                } else {
                    Log.i("TAG", "InstallStateUpdatedListener: state: " + state.installStatus());
                }
            }
        };