How can i add ActionBar in Material Design?

Question

I am troubling to view an Action bar in my application?

I can view Toolbar into my Firstpage but i can not show in Second Page.

I have getting some error...

Here is my java code

public class ContentPage extends ActionBarActivity implements FragmentDrawer.FragmentDrawerListener {

private static String TAG = MainActivity.class.getSimpleName();

private Toolbar mToolbar;
private FragmentDrawer drawerFragment;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_content_page);

    mToolbar = (Toolbar) findViewById(R.id.toolbar);

   setSupportActionBar(mToolbar);
   getSupportActionBar().setDisplayShowHomeEnabled(true);

    drawerFragment = (FragmentDrawer)
            getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
    drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
    drawerFragment.setDrawerListener(this);

    // display the first navigation drawer view on app launch
    displayView(0);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }



    return super.onOptionsItemSelected(item);
}

@Override
public void onDrawerItemSelected(View view, int position) {
    displayView(position);
}

private void displayView(int position) {
    Fragment fragment = null;
    String title = getString(R.string.app_name);
    switch (position) {
        case 0:
            fragment = new HomeFragment();
            title = getString(R.string.title_home);
            break;
        default:
            break;
    }

    if (fragment != null) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container_body, fragment);
        fragmentTransaction.commit();

        // set the toolbar title
        getSupportActionBar().setTitle(title);
    }
}

}

& here is my error what i see...

12-22 16:34:22.022 12457-12457/nextappsbd.testapplicationforhamza E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                Process: nextappsbd.testapplicationforhamza, PID: 12457
                                                                                java.lang.RuntimeException: Unable to start activity ComponentInfo{nextappsbd.testapplicationforhamza/nextappsbd.testapplicationforhamza.ContentPage}: java.lang.NullPointerException
                                                                                    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2377)
                                                                                    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2440)
                                                                                    at android.app.ActivityThread.access$800(ActivityThread.java:151)
                                                                                    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
                                                                                    at android.os.Handler.dispatchMessage(Handler.java:110)
                                                                                    at android.os.Looper.loop(Looper.java:193)
                                                                                    at android.app.ActivityThread.main(ActivityThread.java:5344)
                                                                                    at java.lang.reflect.Method.invokeNative(Native Method)
                                                                                    at java.lang.reflect.Method.invoke(Method.java:515)
                                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:676)
                                                                                    at dalvik.system.NativeStart.main(Native Method)
                                                                                 Caused by: java.lang.NullPointerException
                                                                                    at android.support.v7.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:98)
                                                                                    at android.support.v7.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:91)
                                                                                    at android.support.v7.app.ToolbarActionBar.<init>(ToolbarActionBar.java:73)
                                                                                    at android.support.v7.app.AppCompatDelegateImplV7.setSupportActionBar(AppCompatDelegateImplV7.java:205)
                                                                                    at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:99)
                                                                                    at nextappsbd.testapplicationforhamza.ContentPage.onCreate(ContentPage.java:28)
                                                                                    at android.app.Activity.performCreate(Activity.java:5361)
                                                                                    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
                                                                                    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331)
                                                                                    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2440) 
                                                                                    at android.app.ActivityThread.access$800(ActivityThread.java:151) 
                                                                                    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342) 
                                                                                    at android.os.Handler.dispatchMessage(Handler.java:110) 
                                                                                    at android.os.Looper.loop(Looper.java:193) 
                                                                                    at android.app.ActivityThread.main(ActivityThread.java:5344) 
                                                                                    at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                                    at java.lang.reflect.Method.invoke(Method.java:515) 
                                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:676) 
                                                                                    at dalvik.system.NativeStart.main(Native Method)

here is my MainActivity..

public class MainActivity extends ActionBarActivity implements FragmentDrawer.FragmentDrawerListener {

private static String TAG = MainActivity.class.getSimpleName();

private Toolbar mToolbar;
private FragmentDrawer drawerFragment;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mToolbar = (Toolbar) findViewById(R.id.toolbar);

    setSupportActionBar(mToolbar);
    getSupportActionBar().setDisplayShowHomeEnabled(true);

    drawerFragment = (FragmentDrawer)
            getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
    drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
    drawerFragment.setDrawerListener(this);

    // display the first navigation drawer view on app launch
    displayView(0);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }



    return super.onOptionsItemSelected(item);
}

@Override
public void onDrawerItemSelected(View view, int position) {
    displayView(position);
}

private void displayView(int position) {
    Fragment fragment = null;
    String title = getString(R.string.app_name);
    switch (position) {
        case 0:
            fragment = new HomeFragment();
            title = getString(R.string.title_home);
            break;
        default:
            break;
    }

    if (fragment != null) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container_body, fragment);
        fragmentTransaction.commit();

        // set the toolbar title
        getSupportActionBar().setTitle(title);
    }
}

}

I show the toolbar in MainActivity but i can not show this toolbar in ContentPage Activity.

How can i solve this??

why using `ActionBarActivity` ? It's a deprecated . Use `AppcompatActivity` — IntelliJ Amiya, Dec 22 '15 at 10:50
I am getting Error setSupportActionBar(mToolbar); getSupportActionBar().setDisplayShowHomeEnabled(true); in those line when i use only Activity — Amit Saha, Dec 22 '15 at 10:52
use AppCompartActivty and if you are useing android studio then create new project with toolbar its add full code with sample. because actionbar is depricated in API 23 listed of that use toolBar — Dhaval Parmar, Dec 22 '15 at 10:53
Possible duplicate of [What is a Null Pointer Exception, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it) — yennsarah, Dec 22 '15 at 10:54

IntelliJ Amiya · Accepted Answer · 2015-12-22T10:58:13.700

2

Since version 22.1.0, the class ActionBarActivity is deprecated. You should use AppCompatActivity.

public class ContentPage extends AppCompatActivity

Then

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_content_page);
    mToolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(mToolbar);

edited Dec 22 '15 at 10:58

answered Dec 22 '15 at 10:55

IntelliJ Amiya

74,896
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score 0 · Answer 2 · answered Dec 22 '15 at 10:54

0

Check Android developer site

You can also go through this example

answered Dec 22 '15 at 10:54

a.r.

565
1
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How can i add ActionBar in Material Design?

2 Answers2