setDisplayHomeAsUpEnabled() funktioniert nicht in PreferenceActivity

Ich habe eine SettingsActivity erstreckt PreferenceActivity zeigen die Einstellungen in meiner app.

Es ist ein zurück-Pfeil, aber es funktioniert nicht.

Hier SettingsActivity.java Datei ist code:

public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener{

    private AppCompatDelegate mDelegate;

    public static final String RESET_PASSWORD_KEY = "reset_password";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //TODO Auto-generated method stub
        getDelegate().installViewFactory();
        getDelegate().onCreate(savedInstanceState);
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);

        SharedPreferences sharedPreferencesCompat = PreferenceManager.getDefaultSharedPreferences(getBaseContext());

        Preference myPref = (Preference) findPreference(RESET_PASSWORD_KEY);
        myPref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
            public boolean onPreferenceClick(Preference preference) {
                //open browser or intent here
                Intent resetPasswordActivityIntent = new Intent(SettingsActivity.this, ResetPasswordActivity.class);
                startActivity(resetPasswordActivityIntent);
                return true;
            }
        });

    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        getDelegate().onPostCreate(savedInstanceState);
    }

    public ActionBar getSupportActionBar() {
        return getDelegate().getSupportActionBar();
    }

    public void setSupportActionBar(@Nullable Toolbar toolbar) {
        getDelegate().setSupportActionBar(toolbar);
        getDelegate().getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

    @Override
    public MenuInflater getMenuInflater() {
        return getDelegate().getMenuInflater();
    }

    @Override
    public void setContentView(@LayoutRes int layoutResID) {
        getDelegate().setContentView(layoutResID);
    }

    @Override
    public void setContentView(View view) {
        getDelegate().setContentView(view);
    }

    @Override
    public void setContentView(View view, ViewGroup.LayoutParams params) {
        getDelegate().setContentView(view, params);
    }

    @Override
    public void addContentView(View view, ViewGroup.LayoutParams params) {
        getDelegate().addContentView(view, params);
    }

    @Override
    protected void onPostResume() {
        super.onPostResume();
        getDelegate().onPostResume();
    }

    @Override
    protected void onTitleChanged(CharSequence title, int color) {
        super.onTitleChanged(title, color);
        getDelegate().setTitle(title);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        getDelegate().onConfigurationChanged(newConfig);
    }

    @Override
    protected void onStop() {
        super.onStop();
        getDelegate().onStop();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        getDelegate().onDestroy();
    }

    public void invalidateOptionsMenu() {
        getDelegate().invalidateOptionsMenu();
    }

    private AppCompatDelegate getDelegate() {
        if (mDelegate == null) {
            mDelegate = AppCompatDelegate.create(this, null);
        }
        return mDelegate;
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        if (key.equals(RESET_PASSWORD_KEY)) {

        }
    }
}

Hier preferences.xml Datei ist code:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <Preference
        android:title="xxx"
        android:summary="xxxxxx"
        android:key="reset_password" />
</PreferenceScreen>

Hier ist, wie "SettingsActivity' definiert ist, in AndroidManifest.xml:

<activity
    android:name=".SettingsActivity"
    android:label="@string/title_activity_settings"
    android:parentActivityName=".MainActivity">
</activity>

Wie kann ich machen, dass der Pfeil in Betrieb?

Bitte lassen Sie mich wissen.

Sorry, falls die Frage format scheint unangemessen. Ich bin noch Anfänger.

  • wo ist die Symbolleiste?
InformationsquelleAutor Hammad Nasir | 2016-04-05
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