NullPointException与getActionBar [英] NullPointException with getActionBar
问题描述
我有我的平板电脑界面(安卓> 3)一个非常奇怪的现象。 当我启动它,它就像一个机器人2 *界面底部的称号。 当然,当我打电话的getActionBar()返回一个空。
I have a really strange behaviour with my tablet interface (Android > 3). When I launch it, it's like a Android 2* interface with the title at the bottom. And of course when I call the getActionBar() it returns a null.
我最小的SDK和放大器;目标SDK被设定好,我使用SDK的Android 3.0(11)。我在哪里错了?
My min-sdk & target-sdk are well set and I use the SDK Android 3.0 (11). Where am I wrong ?
public class MainScreenActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainlayout);
ActionBar bar = getActionBar();
bar.setBackgroundDrawable(getResources().getDrawable(R.drawable.actionbar));
随着最后一行我得到这个错误:
With the last line I get this error :
Caused by: java.lang.NullPointerException
E/AndroidRuntime( 9082): at com.shoppingscanner.tablet.MainScreenActivity.onCreate(MainScreenActivity.java:21)
E/AndroidRuntime( 9082): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1050)
E/AndroidRuntime( 9082): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1782)
E/AndroidRuntime( 9082): ... 11 more
我的清单(的Android 3.0中使用):
My Manifest (Android 3.0 used) :
<uses-sdk
android:minSdkVersion="5"
android:targetSdkVersion="11" />
即使minSdk是11,我有这种行为。
Even if the minSdk is 11, I have this behaviour.
谢谢!
推荐答案
您还需要你的活动的窗口,有肉眼可见的称号。您可以采取的帮助 这里
You also need your Activity's window to have the title visible. you can take help from here
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