我创建了一个扩展 FrameLayout 的类:
public class EnhancedMapView extends FrameLayout
{
private CustomMapView mapViewComponent;
public EnhancedMapView(Context context,String apiKey)
{
super(context);
/*mapViewComponent=new CustomMapView(context,apiKey);
catch (Exception exception)
{
StackTraceElement[] stackTraceElements=exception.getStackTrace();
for (StackTraceElement stackTraceElement:stackTraceElements)
Log.i("Blabla",stackTraceElement.toString());
}
buildMapViewLayout();*/
}
}
这是我在以下课程中使用的活动:
public class TestMapViewActivity extends Activity
{
private EnhancedMapView enhancedMapView;
@Override protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
String apiKey=getResources().getString(R.string.google_maps_api_key);
enhancedMapView=new EnhancedMapView(this,apiKey);
setContentView(enhancedMapView);
}
}
我得到:
11-23 11:43:44.425: E/AndroidRuntime(440): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{shira.android.mapview/shira.android.mapview.EnhancedMapView}: java.lang.InstantiationException: shira.android.mapview.EnhancedMapView
11-23 11:43:44.425: E/AndroidRuntime(440): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
11-23 11:43:44.425: E/AndroidRuntime(440): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
11-23 11:43:44.425: E/AndroidRuntime(440): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
11-23 11:43:44.425: E/AndroidRuntime(440): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
11-23 11:43:44.425: E/AndroidRuntime(440): at android.os.Handler.dispatchMessage(Handler.java:99)
11-23 11:43:44.425: E/AndroidRuntime(440): at android.os.Looper.loop(Looper.java:130)
11-23 11:43:44.425: E/AndroidRuntime(440): at android.app.ActivityThread.main(ActivityThread.java:3683)
11-23 11:43:44.425: E/AndroidRuntime(440): at java.lang.reflect.Method.invokeNative(Native Method)
11-23 11:43:44.425: E/AndroidRuntime(440): at java.lang.reflect.Method.invoke(Method.java:507)
11-23 11:43:44.425: E/AndroidRuntime(440): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-23 11:43:44.425: E/AndroidRuntime(440): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-23 11:43:44.425: E/AndroidRuntime(440): at dalvik.system.NativeStart.main(Native Method)
11-23 11:43:44.425: E/AndroidRuntime(440): Caused by: java.lang.InstantiationException: shira.android.mapview.EnhancedMapView
11-23 11:43:44.425: E/AndroidRuntime(440): at java.lang.Class.newInstanceImpl(Native Method)
11-23 11:43:44.425: E/AndroidRuntime(440): at java.lang.Class.newInstance(Class.java:1409)
11-23 11:43:44.425: E/AndroidRuntime(440): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
11-23 11:43:44.425: E/AndroidRuntime(440): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
最初,我有一些使用谷歌地图的代码,但我把它全部注释掉了。似乎异常来自 FrameLayout 构造函数,我从自定义视图类(使用 super)调用它,我不知道是什么导致它发生......
有人可以帮我吗?谢谢。