我想在我的应用程序中使用 ActionBarSherlock。当我打电话时,getSupportActionBar()
我得到一个NullPointerException
;我已经将 ActionBarSherlock 库导入到我的项目中。
这是我的Java类:
public class ProfileActivity extends SherlockActivity {
@Override
public boolean onCreateOptionsMenu(com.actionbarsherlock.view.Menu menu) {
com.actionbarsherlock.view.MenuInflater inflater = this.getSupportMenuInflater();
inflater.inflate(R.menu.mainmenu, menu);
return true;
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.profile_page);
getSupportActionBar().setTitle("Example!"); //nullpointerException
}
}
}
还有我的清单文件:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sal"
android:versionCode="1"
android:versionName="1.0" >
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="10" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
<permission
android:name="com.vogella.android.locationapi.maps.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<!-- The following two permissions are not required to use
Google Maps Android API v2, but are recommended. -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="com.example.sal.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:name=".FriendPickerApplication">
<activity
android:name="com.example.sal.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>
<!-- Entry for RegisterActivity.class -->
<activity android:name=".RegisterActivity"
android:label="Register New Account"></activity>
<meta-data android:value="@string/app_id" android:name="com.facebook.sdk.ApplicationId"/>
<activity android:label="@string/app_name" android:name="com.facebook.LoginActivity"></activity>
<activity android:name=".ProfileActivity" android:label="Profile page"></activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyDTVRXMTmfe3jZyAlt-87kRgqM8y4TzIto"/>
<activity android:name="SaleMapActivity"></activity>
<activity android:name="GroupMapActivity"></activity>
<activity android:name="DeliverMapActivity"></activity>
<activity android:name="PickFriendsActivity"></activity>
<activity android:name="TabMainActivity"></activity>
<activity android:name="itemSaleActivity"></activity>
<activity android:name="FreindsActivity"></activity>
<activity android:name="ExitActivity"></activity>
<activity android:name="OneTimeDetailesScreen"></activity>
</application>
</manifest>
谢谢。
这是我的风格:
<style name="AppTheme" parent="Theme.Sherlock.Light">
<item name="android:windowActionBar">true</item>
</style>
这里是logcat:
03-24 16:20:24.325: E/AndroidRuntime(1927): Caused by: java.lang.NullPointerException
03-24 16:20:24.325: E/AndroidRuntime(1927): at com.example.sal.ProfileActivity.onCreate(ProfileActivity.java:349)
03-24 16:20:24.325: E/AndroidRuntime(1927): at android.app.Activity.performCreate(Activity.java:5104)
03-24 16:20:24.325: E/AndroidRuntime(1927): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
03-24 16:20:24.325: E/AndroidRuntime(1927): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
03-24 16:20:24.325: E/AndroidRuntime(1927): ... 23 more