android - IllegalStateException - ViewPager 中的 removeView()

Question

我正在尝试使用 ViewPager 处理我的 Fragment，但出现此错误:

LogCat:

12-19 14:16:25.180: I/mFragment(5866): onCreate() LogicAnalizerActivity
12-19 14:16:25.235: I/mFragment(5866): FragmentAdapter Constructor
12-19 14:16:25.235: I/mFragment(5866): onResume() LogicAnalizerActivity
12-19 14:16:25.310: I/mFragment(5866): Page item 0
12-19 14:16:25.320: I/onCreate()(5866): onCreate LogicAnalizerView
12-19 14:16:25.350: D/AndroidRuntime(5866): Shutting down VM
12-19 14:16:25.355: W/dalvikvm(5866): threadid=1: thread exiting with uncaught exception (group=0x40d77300)
12-19 14:16:25.690: E/AndroidRuntime(5866): FATAL EXCEPTION: main
12-19 14:16:25.690: E/AndroidRuntime(5866): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewGroup.addViewInner(ViewGroup.java:3378)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewGroup.addView(ViewGroup.java:3249)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewGroup.addView(ViewGroup.java:3194)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewGroup.addView(ViewGroup.java:3170)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:874)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1080)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:622)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:139)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.view.ViewPager.populate(ViewPager.java:804)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1016)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.View.measure(View.java:15172)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.View.measure(View.java:15172)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.View.measure(View.java:15172)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:833)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.View.measure(View.java:15172)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2432)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.View.measure(View.java:15172)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.Choreographer.doCallbacks(Choreographer.java:555)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.Choreographer.doFrame(Choreographer.java:525)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.os.Handler.handleCallback(Handler.java:615)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.os.Looper.loop(Looper.java:137)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at android.app.ActivityThread.main(ActivityThread.java:4978)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at java.lang.reflect.Method.invokeNative(Native Method)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at java.lang.reflect.Method.invoke(Method.java:511)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
12-19 14:16:25.690: E/AndroidRuntime(5866):     at dalvik.system.NativeStart.main(Native Method)

---

Activity fragment :

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;

public class LogicAnalizerActivity extends SherlockFragmentActivity {

    private static final boolean DEBUG = true;
    /** Numero de paginas del ViewPager */
    private static final int pageCount = 1;

    private static ActionBar actionBar;
    private static ViewPager mViewPager;
    private static MyFragmentAdapter mAdapter;


    @Override
    protected void onCreate(Bundle arg0) {
        super.onCreate(arg0);
        if(DEBUG) Log.i("mFragment","onCreate() LogicAnalizerActivity");

        actionBar = getSupportActionBar();
        setContentView(R.layout.fragment);

        mAdapter = new MyFragmentAdapter(getSupportFragmentManager());
        mViewPager = (ViewPager) findViewById(R.id.pagerLogicAnalizer);
        mViewPager.setAdapter(mAdapter);

        mViewPager.setCurrentItem(0);
        mViewPager.setOffscreenPageLimit(1);

    }

    @Override
    protected void onResume() {
        if(DEBUG) Log.i("mFragment","onResume() LogicAnalizerActivity");
        super.onResume();
    }

    /**
     * Crea el ActionBar desde el XML actionbarlogic que define los iconos en el mismo
     */
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if(DEBUG) Log.i("onCreateOptionsMenu()", "onCreateOptionsMenu() -> LogicAnalizerView");
        MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.actionbarlogic, menu);
        return true;
    }

    public static class MyFragmentAdapter extends FragmentPagerAdapter{

        public MyFragmentAdapter(FragmentManager fm) {
            super(fm);
            if(DEBUG) Log.i("mFragment","FragmentAdapter Constructor");
        }

        @Override
        public Fragment getItem(int arg0) {
            if(DEBUG) Log.i("mFragment","Page item " + arg0);
            switch(arg0){
                case 0:
                    return new LogicAnalizerFragment();
                case 1:
                    return new LogicAnalizerFragment();
            }
            return new LogicAnalizerFragment();
        }

        @Override
        public int getCount() {
            return pageCount;
        }

        @Override
        public void destroyItem(View collection, int position, Object view) {
            if(DEBUG) Log.i("mFragment","Destroy item " + position);
            ((ViewPager) collection).removeView((LinearLayout) view);
        }

    }
}

---

逻辑分析器 fragment :太长了，可以看看here

---

fragment .xml:

<?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" >

    <android.support.v4.view.ViewPager
        android:id="@+id/pagerLogicAnalizer"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

Fragment 正常工作，但是当我尝试将它与 ViewPager 一起使用时出现此错误，我搜索了很多 ViewPager 示例，结果都是一样的。我已经添加:

            @Override
            public void destroyItem(View collection, int position, Object view) {
                if(DEBUG) Log.i("mFragment","Destroy item " + position);
                ((ViewPager) collection).removeView((LinearLayout) view);
            }

尝试解决问题，但问题仍然存在。

Answer 1

第 250 行，

return inflater.inflate(R.layout.logicanalizer, container);

添加假；

 return inflater.inflate(R.layout.logicanalizer, container,false);

第三个参数决定是否应该附加到“容器”，文档:

@3rd param attachToRoot Whether the inflated hierarchy should be attached to the root parameter? If false, root is only used to create the correct subclass of LayoutParams for the root view in the XML.

@return The root View of the inflated hierarchy. If root was supplied and attachToRoot is true, this is root; otherwise it is the root of the inflated XML file.