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Code Issues Packages Projects Releases Wiki Activity

Lifecycle aware back listener

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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
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@@ -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)