我正在尝试实现一个GridViewPager,以便在两个独特的视图之间进行切换。到目前为止,我还没有能够添加任何视图。以下是我的代码。
在主视图 stub 的矩形子视图中,我有一个id为 pager 的 GridViewPager,就像我之前提到的那样:
这段代码会抛出一个非法状态异常并且会提示我的子视图已经有了父级对象。具体请看下方:
public class Gridder extends Activity {
private TextView mTextView;
GridViewPager gridViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gridder);
final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
final LayoutInflater inflater = getLayoutInflater();
stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
@Override
public void onLayoutInflated(WatchViewStub stub) {
gridViewPager = (GridViewPager) findViewById(R.id.pager);
gridViewPager.setAdapter(new MyGridViewPagerAdapter());
gridViewPager.addView(inflater.inflate(R.layout.selector_generic, stub));;
}
});
}
private class MyGridViewPagerAdapter extends GridPagerAdapter {
@Override
protected void destroyItem(ViewGroup arg0, int arg1, int arg2, Object arg3) {
}
@Override
public int getColumnCount(int arg0) {
return 1;
}
@Override
public int getRowCount() {
return 1;
}
@Override
protected Object instantiateItem(ViewGroup arg0, int arg1, int arg2) {
return null;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return false;
}
}
在主视图 stub 的矩形子视图中,我有一个id为 pager 的 GridViewPager,就像我之前提到的那样:
<android.support.wearable.view.GridViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:keepScreenOn="true" />
这段代码会抛出一个非法状态异常并且会提示我的子视图已经有了父级对象。具体请看下方:
...
07-16 14:44:40.847 12940-12940/com.larvalabs.weartest E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.larvalabs.weartest, PID: 12940
java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:3561)
at android.view.ViewGroup.addView(ViewGroup.java:3414)
at android.support.wearable.view.GridViewPager.addView(GridViewPager.java:1088)
at android.view.ViewGroup.addView(ViewGroup.java:3359)
at android.view.ViewGroup.addView(ViewGroup.java:3335)
at com.larvalabs.weartest.Gridder$1.onLayoutInflated(Gridder.java:30)
at android.support.wearable.view.WatchViewStub.inflate(WatchViewStub.java:133)
at android.support.wearable.view.WatchViewStub.onMeasure(WatchViewStub.java:141)
at android.view.View.measure(View.java:16648)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16648)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2321)
at android.view.View.measure(View.java:16648)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1959)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1145)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1340)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1032)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5657)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5026)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
at dalvik.system.NativeStart.main(Native Method)