I have an android activity, but when the phone goes to sleep(meaning I leave the phone there for a few seconds and then the screen goes black) and I turn it back on, the activity/app disappears(it's still active but i have to press the overview button to come back to the activity/app). How do I get it to come back automatically?
What I want to do is when the phone goes to sleep, when I turn it back on, the app/activity is there as it was when it went to sleep. I've checked up onResume, BroadcastReceivers, WakeLock, KeepScreenOn, Services, but I know I'm not doing it right.
OnResume doesn't work, WakeLock doesn't work, KeepScreenOn, just keeps the screen on and doesn't allow the phone to sleep, I haven't tried Services and BroadcastReceivers, but I thought I should ask here first.
Please help. Thanks.
I have MainActivity.java which opens initially and then starts AdminAddMerchantActivity.java. AdminAddMerchantActivity.java is a navigationView that starts 4 fragments including TimeFragment.java which has a tab layout, a view pager and a pager adapter. TimeFragment.java starts 5 fragments including PriceFragment.java. Below is the activities lifecycle methods below.
MainActivity.java:
...
@Override
protected void onPause() {
super.onPause();
Log.d("state", "Pausing Main");
// Handle countdown stop here
}
@Override
protected void onResume() {
super.onResume();
Log.d("state", "Resuming Main");
currentActivity = sharedPreferences.getString(CURRENT_ACT, "main");
if(mAuth.getCurrentUser() != null)
{
if(currentActivity.equals("confirmFinalOrder"))
{
isResumed++;
Intent intent = new Intent(MainActivity.this, ConfirmFinalOrderActivity.class);
startActivity(intent);
finish();
}
else if(currentActivity.equals("merchantDetails"))
{
isResumed++;
Intent intent = new Intent(MainActivity.this, MerchantDetailsActivity.class);
intent.putExtra("mid", sharedPreferences.getString("merchantid", ""));
startActivity(intent);
finish();
}
else if(currentActivity.equals("navigation")) {
isResumed++;
Intent intent = new Intent(MainActivity.this, NavigationActivity.class);
fragment = sharedPreferences.getString("fragment", "Find Food");
intent.putExtra("activity", fragment);
startActivity(intent);
finish();
}
else if(currentActivity.equals("adminaddnewmerchant"))
{
isResumed++;
Intent intent = new Intent(MainActivity.this, AdminAddNewMerchantActivity.class);
startActivity(intent);
finish();
}
else if(currentActivity.equals("searchmerchants"))
{
isResumed++;
Intent intent = new Intent(MainActivity.this, SearchMerchantsActivity.class);
startActivity(intent);
finish();
}
else if(currentActivity.equals("settingsuser"))
{
isResumed++;
Intent intent = new Intent(MainActivity.this, SettingsActivity.class);
startActivity(intent);
finish();
}
else if(currentActivity.equals("settingsmerchant"))
{
isResumed++;
Intent intent = new Intent(this, SettingsMerchantActivity.class);
startActivity(intent);
finish();
}
else if(currentActivity.equals("sellerregistration"))
{
isResumed++;
Intent intent = new Intent(MainActivity.this, SellerRegistrationActivity.class);
startActivity(intent);
finish();
}
}
else{
if(currentActivity.equals("sellerregistration"))
{
isResumed++;
Intent intent = new Intent(MainActivity.this, SellerRegistrationActivity.class);
startActivity(intent);
finish();
}
else if(!sharedPreferences.getString("current activity", "main").equals("login user")
&& !sharedPreferences.getString("current activity", "main").equals("login merchant"))
{
currentActivity = "main";
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.putString(CURRENT_ACT,currentActivity);
editor.commit();
Paper.book().write(Prevalent.RememberMeMerchant, "false");
Paper.book().write(Prevalent.emailKey, "UserEmail");
Paper.book().write(Prevalent.passwordKey, "UserPassword");
}
}
// Handle countdown start here
}
@Override
protected void onStop() {
super.onStop();
Log.d("state","Stopping Main");
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.d("state", "Destroyed Main");
}
@Override
protected void onRestart() {
super.onRestart();
Log.d("state", "Restarted Main");
}
@Override
protected void onStart() {
super.onStart();
Log.d("state", "Started Main");
}
@Override
protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Log.d("state", "onRestoreInstanceState Main");
}
@Override
protected void onSaveInstanceState(@NonNull Bundle outState) {
super.onSaveInstanceState(outState);
Log.d("state", "onSaveInstanceState Main");
}
//if the user
@Override
public void onBackPressed() {
Log.d("state", "back login");
currentActivity = "main";
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(CURRENT_ACT,currentActivity);
editor.commit();
}
...
AdminAddNewMerchantActivity.java:
...
@Override
public void onBackPressed()
{
if(drawer.isDrawerOpen(GravityCompat.START))
{
drawer.closeDrawer(GravityCompat.START);
}
else{
super.onBackPressed();
}
}
@Override
public void onResume() {
super.onResume(); // Always call the superclass method first
// Get the Camera instance as the activity achieves full user focus
//if (mCamera == null) {
//initializeCamera(); // Local method to handle camera init
//}
}
...
PriceFragment.java:
...
@Override
public void onDestroy() {
super.onDestroy();
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt("scrollPrice", scrollView.getScrollY());
editor.commit();
}
@Override
public void onResume() {
Log.d("onResume", "Resumed");
super.onResume();
}
...
TimeFragment.java:
...
@Override
public void onResume() {
super.onResume();
}
...
The default Android behavior should do this automatically...
Are you doing something special on the onPause or onStop methods?
And if you're not, can you create a new project via Android Studio and test to see if this behavior persists on the new app?