Android java.lang.NullPointerException getActionBar()

Question

I tried to implement an Setting Activity class but it give's me back an error:

Caused by: java.lang.NullPointerException
            at com.example.andrei.sunshine.SettingsActivity.setupActionBar(SettingsActivity.java:58)
            at com.example.andrei.sunshine.SettingsActivity.onCreate(SettingsActivity.java:48)
            at android.app.Activity.performCreate(Activity.java:5264)

This is the line : getActionBar().setDisplayHomeAsUpEnabled(true);

And the AndroidManifest is :

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.INTERNET" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".DetailActivity"
        android:label="@string/title_activity_detail"
        android:parentActivityName=".MainActivity" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.example.andrei.sunshine.MainActivity" />
    </activity>
    <activity
        android:name=".SettingsActivity"
        android:label="@string/title_activity_settings"
        android:parentActivityName=".MainActivity" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.example.andrei.sunshine.MainActivity" />
    </activity>
</application>

Please help me

possible duplicate of [getActionBar() returns null](http://stackoverflow.com/questions/6867076/getactionbar-returns-null) — ArchiFloyd, Feb 09 '15 at 09:54
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setupActionBar(); } — Andrei Bernic, Feb 09 '15 at 10:32
@TargetApi(Build.VERSION_CODES.HONEYCOMB) private void setupActionBar() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { // Show the Up button in the action bar. getActionBar().setDisplayHomeAsUpEnabled(true); } } — Andrei Bernic, Feb 09 '15 at 10:32

Marcus · Answer 1 · 2015-02-09T10:03:14.097

If your SettingsActivity extend ActionBarActivity, your getActionBar(); will be available.

public class SettingsActivity extends ActionBarActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.yourLayout);
        //If you use support library
        //getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
        getActionBar().setDisplayHomeAsUpEnabled(true);
    }
}

See the documentation for more info.

score 0 · Answer 2 · answered Feb 09 '15 at 10:02

You should check this reference http://developer.android.com/intl/es/guide/topics/ui/actionbar.html

If you are supporting API levels lower than 11:

import android.support.v7.app.ActionBar

If supporting only API level 11 and higher:

import android.app.ActionBar

Instead of using getActionBar, use getSupportActionBar

score 0 · Answer 3 · answered Feb 09 '15 at 10:05

0

It can happen if your theme is NoTitleBar or NoActionBar, or if you call getActionBar() before setContentView(R.layout.layout);

answered Feb 09 '15 at 10:05

nbaroz

1,795
13
14

score 0 · Answer 4 · answered Feb 09 '15 at 10:08

0

Try to change it getSupportActionBar() if you are using appcompact ActionbarActivity

answered Feb 09 '15 at 10:08

Jitty Aandyan

1,994
1
13
12

Android java.lang.NullPointerException getActionBar()

4 Answers4