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androidx-compatible PreferenceActivity
package nl.nl2312.example;
import android.os.Bundle;
import androidx.annotation.XmlRes;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.app.AppCompatCallback;
import androidx.preference.Preference;
import androidx.preference.PreferenceFragmentCompat;
import androidx.preference.PreferenceManager;
import androidx.preference.PreferenceScreen;
public class PreferenceCompatActivity extends AppCompatActivity implements AppCompatCallback, PreferenceFragmentCompat.OnPreferenceStartScreenCallback {
private PreferenceFragmentCompat fragment;
public void addPreferencesFromResource(@XmlRes int preferencesResId) {
fragment = new RootPreferencesFragment(preferencesResId);
getSupportFragmentManager().beginTransaction().replace(android.R.id.content, fragment).commitNow();
}
public PreferenceManager getPreferenceManager() {
return fragment.getPreferenceManager();
}
public PreferenceScreen getPreferenceScreen() {
return fragment.getPreferenceScreen();
}
public Preference findPreference(CharSequence key) {
return fragment.findPreference(key);
}
@Override
public boolean onPreferenceStartScreen(PreferenceFragmentCompat caller, PreferenceScreen pref) {
LowerPreferencesFragment lowerFragment = new LowerPreferencesFragment(pref);
getSupportFragmentManager().beginTransaction().replace(android.R.id.content, lowerFragment).addToBackStack("lower").commit();
return true;
}
public static class RootPreferencesFragment extends PreferenceFragmentCompat {
private int preferencesResId;
public RootPreferencesFragment(int preferencesResId) {
this.preferencesResId = preferencesResId;
}
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
addPreferencesFromResource(preferencesResId);
}
}
public static class LowerPreferencesFragment extends PreferenceFragmentCompat {
private PreferenceScreen prefs;
public LowerPreferencesFragment() {
}
public LowerPreferencesFragment(PreferenceScreen prefs) {
this.prefs = prefs;
}
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
if (prefs != null) {
setPreferenceScreen(prefs);
prefs = null;
}
}
}
}
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