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Ich brauche Hilfe, um ein Problem mit PreferenceFragmentCompat zu beheben, die einfach nicht angezeigt wird, kein Fehler in der Konsole, keine Nachricht, nichts, nur eine leere Seite.PreferenceFragmentCompat zeigt nicht
Das Fragment wird als Ergebnis der Auswahl eines Elements in einer Navigationsleiste angezeigt. Hier ist die XML-Aktivität:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="false">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/list_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_marginBottom="24dp"
android:layout_marginEnd="24dp"
app:elevation="12dp"
app:fabSize="normal"
app:rippleColor="@color/nowControlsNormal"
app:srcCompat="@android:drawable/ic_popup_sync" />
</FrameLayout>
<android.support.design.widget.NavigationView
android:id="@+id/drawer"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="@layout/drawer_top"
app:itemIconTint="@color/nowBlack"
app:itemTextColor="@color/nowBlack"
app:menu="@menu/drawer_menu" />
</android.support.v4.widget.DrawerLayout>
Hier ist die Aktivität Java:
public class HomeActivity extends AppCompatActivity {
SharedPreferences settings;
private DrawerLayout drawerLayout;
private ActionBarDrawerToggle drawerToggle;
NavigationView nav;
TextView drawerUsername;
FloatingActionButton fab;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
settings = getSharedPreferences("NowCLOUD", 0);
setContentView(R.layout.activity_home);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
nav = (NavigationView) findViewById(R.id.drawer);
fab = (FloatingActionButton) findViewById(R.id.fab);
View headerView = nav.getHeaderView(0);
drawerUsername = (TextView) headerView.findViewById(R.id.drawer_username);
fab.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//TODO: Gestire aggiornamento al click della FAB
}
});
getSupportActionBar().setTitle("Home");
drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.drawer_open, R.string.drawer_close) {
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
}
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
}
};
drawerLayout.setDrawerListener(drawerToggle);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportFragmentManager().beginTransaction()
.add(R.id.list_container, HomeFragment.newInstance())
.commit();
drawerUsername.setText(settings.getString("username", "Error"));
nav.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
drawerLayout.closeDrawers();
displayView(menuItem.getItemId());
return true;
}
});
}
public void displayView(int viewId) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (viewId) {
case R.id.drawer_home:
fragment = HomeFragment.newInstance();
title = "Home";
break;
case R.id.drawer_settings:
fragment = SettingsFragment.newInstance();
title = "Settings";
break;
}
if (fragment != null) {
getSupportFragmentManager().beginTransaction()
.replace(R.id.list_container, fragment)
.commit();
}
// set the toolbar title
if (getSupportActionBar() != null) {
getSupportActionBar().setTitle(title);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
}
Hier ist das XML fragment:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.preference.PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent">
<android.support.v7.preference.PreferenceCategory
android:title="@string/settings_synchronization">
<android.support.v7.preference.SwitchPreferenceCompat
android:key="auto_updates"
android:title="@string/settings_auto_sync" />
</android.support.v7.preference.PreferenceCategory>
</android.support.v7.preference.PreferenceScreen>
Hier ist das Java Fragment:
public class SettingsFragment extends PreferenceFragmentCompat {
View rootView;
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
addPreferencesFromResource(R.xml.fragment_settings);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
//rootView = inflater.inflate(R.xml.fragment_settings,container,false);
return rootView;
}
@Override
public PreferenceFragmentCompat getCallbackFragment() {
return this;
}
public static SettingsFragment newInstance() {
Bundle args = new Bundle();
SettingsFragment fragment = new SettingsFragment();
fragment.setArguments(args);
return fragment;
}
}
I‘ Ich habe den ganzen Code entfernt, der w so nutzlos für diesen Zweck. Entschuldigung für die riesige Menge an Code.