How to add toolbar to PreferenceActivity

Question

I created application settings with settings. But I noticed that in my PreferenceActivity there is no toolbar. How can I add a toolbar to my PreferenceActivity?

My code is:

my pref_xml:

<?xml version="1.0" encoding="utf-8"?> <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> <ListPreference android:key="select_class" android:title="@string/select_class" android:defaultValue="0" android:entries="@array/classy" android:entryValues="@array/classy" android:dialogTitle="@string/select_class" /> </PreferenceScreen> 

my PrefActivity.java:

 package ***.***.***; import android.os.Bundle; import android.preference.PreferenceActivity; import android.preference.PreferenceFragment; public class PrefActivity extends PreferenceActivity { @Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); getFragmentManager().beginTransaction().replace(android.R.id.content, new PrefFragment()).commit(); } public static class PrefFragment extends PreferenceFragment { @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.pref); } } } 

PS Gautam, in your .java code there is an error in the line:

 setSupportActionBar(toolbar); : java.lang.RuntimeException: Unable to start activity ComponentInfo{xxx/xxx.PrefActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5349) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703) Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. at android.support.v7.app.AppCompatDelegateImplV7.setSupportActionBar(AppCompatDelegateImplV7.java:198) at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:130) at com.smartfon_apps.timetable_sch32.PrefActivity.onCreate(PrefActivity.java:21) at android.app.Activity.performCreate(Activity.java:6020) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2284) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5349) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703) 

Answer 1

Use the action that extends AppCompatActivity, which contains your toolbar that references the layout file, as shown below.

 public class UserSettingPreference extends AppCompatActivity { Toolbar toolbar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.toolbar); toolbar = (Toolbar) findViewById(R.id.toolbar); toolbar.setTitle("Settings"); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); toolbar.setNavigationOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { onBackPressed(); } }); getFragmentManager().beginTransaction().replace(R.id.fragment_container, new UserPreferenceFragment()).commit(); } } 

Define your layout containing the toolbar and framemute to hold the fragment

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Toolbar xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#80000000" android:minHeight="?android:attr/actionBarSize" app:contentInsetEnd="0dp" app:contentInsetLeft="0dp" app:contentInsetRight="0dp" app:contentInsetStart="0dp"/> <FrameLayout android:id="@+id/fragment_container" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> 

Then define the fragment fragment fragment as shown below -

 public class UserPreferenceFragment extends PreferenceFragment 

To reference your preference.xml override the onCreate fragment as shown below -

  @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.fragment_preference); } 

To reference individual elements within your .xml preference method, use the getPreferenceScreen method

 switchPreference = (SwitchPreference) getPreferenceScreen().findPreference("floating_widget");