我扩展了 LayoutGameActivity 以在 andengine 中创建一个列表视图。但是出现错误
E/AndroidRuntime(8719): java.lang.RuntimeException: 无法启动活动 ComponentInfo{com.example.jumper.game/com.ex.listview.ListViewTestActivity}: java.lang.NullPointerException
E/AndroidRuntime(8719): 在 android .app.ActivityThread.performLaunchActivity(ActivityThread.java:1968)
我的 activity_main.xml 看起来：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@+id/id_list_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</RelativeLayout>
我的活动看起来像：
public class ListViewTestActivity extends LayoutGameActivity {
public Camera camera;
private ResourcesManager resourcesManager;
public final static int CAMERA_WIDTH = 1280;
public final static int CAMERA_HEIGHT = 720;
public ListView aListView;
@Override
public EngineOptions onCreateEngineOptions() {
camera = new Camera(0, 0, 1280, 720);
EngineOptions engineOptions = new EngineOptions(true,
ScreenOrientation.LANDSCAPE_FIXED, new FillResolutionPolicy(),
this.camera);
engineOptions.getAudioOptions().setNeedsMusic(true).setNeedsSound(true);
engineOptions.setWakeLockOptions(WakeLockOptions.SCREEN_ON);
return engineOptions;
}
@Override
public void onCreateResources(
OnCreateResourcesCallback pOnCreateResourcesCallback)
throws Exception {
}
@Override
public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback)
throws Exception {
this.mEngine.registerUpdateHandler(new FPSLogger());
final Scene scene = new Scene();
aListView = (ListView) findViewById(R.id.list_view);
String[] items = new String[] { "Item 1", "Item 2", "Item 3" };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, items);
aListView.setAdapter(adapter);
pOnCreateSceneCallback.onCreateSceneFinished(scene);
}
@Override
public void onPopulateScene(Scene pScene,
OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception {
pOnPopulateSceneCallback.onPopulateSceneFinished();
}
@Override
protected int getLayoutID() {
// my xml layout
return R.layout.activity_main;
}
@Override
protected int getRenderSurfaceViewID() {
return 0;
}
}