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Code Issues Releases Wiki Activity

Lifecycle aware back listener

This commit is contained in:
M66B 2019-04-17 19:26:39 +02:00
parent 82dbd48e9c
commit 490c2b9a86
4 changed files with 20 additions and 17 deletions
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20
app/src/main/java/eu/faircode/email/ActivityBase.java
View File

@ -35,10 +35,15 @@ import java.util.List;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Lifecycle;
import androidx.lifecycle.LifecycleObserver;
import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.OnLifecycleEvent;
import androidx.preference.PreferenceManager;
abstract class ActivityBase extends AppCompatActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
private boolean contacts;
private List<IBackPressedListener> backPressedListeners = new ArrayList<>();
@Override
protected void attachBaseContext(Context base) {
@ -148,16 +153,19 @@ abstract class ActivityBase extends AppCompatActivity implements SharedPreferenc
return findViewById(android.R.id.content);
}
private List<IBackPressedListener> backPressedListeners = new ArrayList<>();
void addBackPressedListener(final IBackPressedListener listener, LifecycleOwner owner) {
owner.getLifecycle().addObserver(new LifecycleObserver() {
@OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
public void onDestroyed() {
Log.i("Removing back listener=" + listener);
backPressedListeners.remove(listener);
}
});
public void addBackPressedListener(IBackPressedListener listener) {
Log.i("Adding back listener=" + listener);
backPressedListeners.add(listener);
}
public void removeBackPressedListener(IBackPressedListener listener) {
backPressedListeners.remove(listener);
}
@Override
public void onBackPressed() {
for (IBackPressedListener listener : backPressedListeners)

4
app/src/main/java/eu/faircode/email/FragmentBase.java
View File

@ -148,4 +148,8 @@ public class FragmentBase extends Fragment {
return false;
return activity.hasPermission(name);
}
void addBackPressedListener(ActivityBase.IBackPressedListener listener) {
((ActivityBase) getActivity()).addBackPressedListener(listener, getViewLifecycleOwner());
}
}

5
app/src/main/java/eu/faircode/email/FragmentCompose.java
View File

@ -406,8 +406,7 @@ public class FragmentCompose extends FragmentBase {
}
});
((ActivityBase) getActivity()).addBackPressedListener(onBackPressedListener);
addBackPressedListener(onBackPressedListener);
// Initialize
setSubtitle(R.string.title_compose);
@ -613,8 +612,6 @@ public class FragmentCompose extends FragmentBase {
if (pgpService != null)
pgpService.unbindFromService();
((ActivityBase) getActivity()).removeBackPressedListener(onBackPressedListener);
super.onDestroyView();
}

8
app/src/main/java/eu/faircode/email/FragmentMessages.java
View File

@ -511,7 +511,7 @@ public class FragmentMessages extends FragmentBase {
}
});
((ActivityBase) getActivity()).addBackPressedListener(onBackPressedListener);
addBackPressedListener(onBackPressedListener);
// Initialize
swipeRefresh.setEnabled(false);
@ -1607,12 +1607,6 @@ public class FragmentMessages extends FragmentBase {
}.execute(FragmentMessages.this, args, "messages:move");
}
@Override
public void onDestroyView() {
((ActivityBase) getActivity()).removeBackPressedListener(onBackPressedListener);
super.onDestroyView();
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putString("fair:searching", searching);