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Code Issues Releases Wiki Activity

Improve (un)registering FragmentLifecycleCallbacks

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to avoid adding it multiple times and ensure proper cleanup
This commit is contained in:
devlearner 2022-12-02 09:25:06 +00:00 committed by Stypox
parent f860392ae9
commit 0f9c20c986
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1 changed files with 27 additions and 20 deletions
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47
app/src/main/java/org/schabi/newpipe/RouterActivity.java
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@ -32,6 +32,7 @@ import androidx.appcompat.content.res.AppCompatResources;
import androidx.core.app.NotificationCompat;
import androidx.core.app.ServiceCompat;
import androidx.core.math.MathUtils;
import androidx.fragment.app.DialogFragment;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.preference.PreferenceManager;
@ -113,6 +114,7 @@ public class RouterActivity extends AppCompatActivity {
private boolean selectionIsDownload = false;
private boolean selectionIsAddToPlaylist = false;
private AlertDialog alertDialogChoice = null;
private FragmentManager.FragmentLifecycleCallbacks dismissListener = null;
@Override
protected void onCreate(final Bundle savedInstanceState) {
@ -142,6 +144,27 @@ public class RouterActivity extends AppCompatActivity {
super.onCreate(savedInstanceState);
Icepick.restoreInstanceState(this, savedInstanceState);
// FragmentManager will take care to recreate (Playlist|Download)Dialog when screen rotates
// We used to .setOnDismissListener(dialog -> finish()); when creating these DialogFragments
// but those callbacks won't survive a config change
// Try an alternate approach to hook into FragmentManager instead, to that effect
// (ref: https://stackoverflow.com/a/44028453)
final FragmentManager fm = getSupportFragmentManager();
if (dismissListener == null) {
dismissListener = new FragmentManager.FragmentLifecycleCallbacks() {
@Override
public void onFragmentDestroyed(@NonNull final FragmentManager fm,
@NonNull final Fragment f) {
super.onFragmentDestroyed(fm, f);
if (f instanceof DialogFragment && fm.getFragments().isEmpty()) {
// No more DialogFragments, we're done
finish();
}
}
};
}
fm.registerFragmentLifecycleCallbacks(dismissListener, false);
if (TextUtils.isEmpty(currentUrl)) {
currentUrl = getUrl(getIntent());
@ -171,29 +194,10 @@ public class RouterActivity extends AppCompatActivity {
protected void onStart() {
super.onStart();
// FragmentManager will take care to recreate DialogFragments when screen rotates
// currently that's namely PlaylistDialog or DownloadDialog
// We used to .setOnDismissListener(dialog ->finish()); when creating those Dialogs
// but those callbacks won't survive a config change
// Try an alternate approach to hook into FragmentManager instead, to that effect
// (courtesy of https://stackoverflow.com/a/44028453)
final FragmentManager fm = getSupportFragmentManager();
fm.registerFragmentLifecycleCallbacks(new FragmentManager.FragmentLifecycleCallbacks() {
@Override
public void onFragmentViewDestroyed(@NonNull final FragmentManager fm,
@NonNull final Fragment f) {
super.onFragmentViewDestroyed(fm, f);
if (fm.getFragments().isEmpty()) {
// No more Dialog, we're done
finish();
}
}
}, false);
// Don't overlap the DialogFragment after rotating the screen
// If there's no DialogFragment, we're either starting afresh
// or we didn't make it to PlaylistDialog or DownloadDialog before the orientation change
if (fm.getFragments().isEmpty()) {
if (getSupportFragmentManager().getFragments().isEmpty()) {
// Start over from scratch
handleUrl(currentUrl);
}
@ -203,6 +207,9 @@ public class RouterActivity extends AppCompatActivity {
protected void onDestroy() {
super.onDestroy();
if (dismissListener != null) {
getSupportFragmentManager().unregisterFragmentLifecycleCallbacks(dismissListener);
}
disposables.clear();
}