0
如果我将RecyclerView与TextView一起放入LinearLayout中，会出现下面的错误，为什么？它工作正常，只有一个RecyclerView。如何在使用碎片时在LinearLayout中使用RecyclerView？
java.lang.IllegalStateException：指定的子项已经有父项。您必须先调用子对象的父对象的removeView（）。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Title ....."
android:id="@+id/textView" />
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment_beat_box_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
片段
public class SoundBoardFragment extends Fragment {
private static final String TAG = "SoundBoardFragment";
private BeatBox mBeatBox;
private static final String ARG_FOLDER_NAME = "soundboard_folder";
private static String mFolderName;
public static SoundBoardFragment newInstance(String folderName)
{
Log.i(TAG, "createFragment " + folderName);
mFolderName = "sounds/" + folderName;
Bundle args = new Bundle();
args.putSerializable(ARG_FOLDER_NAME, folderName);
SoundBoardFragment fragment = new SoundBoardFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
setRetainInstance(true);
Log.i(TAG, "onCreate " + mFolderName);
mBeatBox = new BeatBox(getActivity(),mFolderName);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.fragment_beat_box, container,false);
RecyclerView recyclerView = (RecyclerView)view.findViewById(R.id.fragment_beat_box_recycler_view);
recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 3));
recyclerView.setAdapter(new SoundAdapter(mBeatBox.getSounds()));
return recyclerView;
}
@Override
public void onDestroy()
{
super.onDestroy();
mBeatBox.release();
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
{
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.fragment_sound_board, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.menu_item_quit:
getActivity().onBackPressed();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private class SoundHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
private Button mButton;
private Sound mSound;
public SoundHolder (LayoutInflater inflater, ViewGroup container)
{
super(inflater.inflate(R.layout.list_item_sound, container, false));
mButton = (Button)itemView.findViewById(R.id.list_item_sound_button);
mButton.setOnClickListener(this);
}
public void bindSound(Sound sound)
{
mSound = sound;
mButton.setText(mSound.getName());
}
@Override
public void onClick(View v) {
mBeatBox.play(mSound);
}
}
private class SoundAdapter extends RecyclerView.Adapter<SoundHolder>{
private List<Sound> mSounds;
public SoundAdapter(List<Sound> sounds)
{
mSounds=sounds;
}
@Override
public SoundHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(getActivity());
return new SoundHolder(inflater,parent);
}
@Override
public void onBindViewHolder(SoundHolder holder, int position) {
Sound sound = mSounds.get(position);
holder.bindSound(sound);
}
@Override
public int getItemCount() {
return mSounds.size();
}
}
}
logcat的结果
03-25 21:56:05.258 25429-25429/com.example.blah.soundboard E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.blah.soundboard, PID: 25429
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.blah.soundboard/com.example.blah.soundboard.SoundBoardActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: 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:4309)
at android.view.ViewGroup.addView(ViewGroup.java:4145)
at android.view.ViewGroup.addView(ViewGroup.java:4086)
at android.view.ViewGroup.addView(ViewGroup.java:4059)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:330)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:547)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1237)
at android.app.Activity.performStart(Activity.java:6268)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
每个ItemView控件是内部的FrameLayout
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_margin="8dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/list_item_sound_button"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
tools:text="Sound name">
</Button>
</FrameLayout>
您可以显示logcat输出吗？ – chRyNaN
“itemView”来自SoundHolder（LayoutInflater inflater，ViewGroup容器）？ –
itemView是根视图 –