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當切換回我已經看到的視圖時,活動崩潰並拋出IllegalStateException:指定的子項已經有父項。您必須先調用子對象的父對象的removeView()。IllegalStateException:指定的子項已經有父項
堆棧跟蹤:
02-23 23:59:22.685 9254-9254/ldellabella3.gatech.edu.sustainability_in_computer_science E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: ldellabella3.gatech.edu.sustainability_in_computer_science, PID: 9254
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:3770)
at android.view.ViewGroup.addView(ViewGroup.java:3623)
at android.view.ViewGroup.addView(ViewGroup.java:3568)
at android.view.ViewGroup.addView(ViewGroup.java:3544)
at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:951)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
at android.support.v4.view.ViewPager$3.run(ViewPager.java:249)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:812)
at android.view.Choreographer.doCallbacks(Choreographer.java:612)
at android.view.Choreographer.doFrame(Choreographer.java:581)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:798)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
02-24 00:02:57.133 9800-9800/ldellabella3.gatech.edu.sustainability_in_computer_science E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: ldellabella3.gatech.edu.sustainability_in_computer_science, PID: 9800
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:3770)
at android.view.ViewGroup.addView(ViewGroup.java:3623)
at android.view.ViewGroup.addView(ViewGroup.java:3568)
at android.view.ViewGroup.addView(ViewGroup.java:3544)
at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:951)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
at android.support.v4.view.ViewPager$3.run(ViewPager.java:249)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:812)
at android.view.Choreographer.doCallbacks(Choreographer.java:612)
at android.view.Choreographer.doFrame(Choreographer.java:581)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:798)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
,我傳遞給的setContentView()的XML僅僅是
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
這是一個不斷崩潰的活動:
public class LearnMoreSlidesActivity extends FragmentActivity {
private ViewPager viewPager;
private PagerAdapter pagerAdapter;
private ImageView[] slidesArray;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_learn_more);
viewPager = (ViewPager) findViewById(R.id.pager);
pagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(pagerAdapter);
slidesArray = new ImageView[]{
new ImageView(this),
new ImageView(this),
new ImageView(this)
};
slidesArray[0].setImageResource(R.drawable.earthzineimg);
slidesArray[1].setImageResource(R.drawable.computingsustainability);
slidesArray[2].setImageResource(R.drawable.computingandsustainability);
}
@Override
public void onBackPressed() {
if (viewPager.getCurrentItem() == 0) {
// If the user is currently looking at the first step, allow the system to handle the
// Back button. This calls finish() on this activity and pops the back stack.
super.onBackPressed();
} else {
// Otherwise, select the previous step.
viewPager.setCurrentItem(viewPager.getCurrentItem() - 1);
}
}
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
//this is where we "inflate" fragment_learn_more with our ldellabella3.gatech.edu.sustainability_in_computer_science.ScreenSlideFragment
@Override
public Fragment getItem(int position) {
ScreenSlideFragment slideFragment = new ScreenSlideFragment();
slideFragment.setMySlide(slidesArray[position]);
return slideFragment;
}
@Override
public int getCount() {
return 3;
}
}
}
我ScreenSlideFragmentClass
public class ScreenSlideFragment extends Fragment {
private ImageView myImg;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return myImg;
}
public void setMySlide(ImageView img) {
myImg = img;
}
}
你可以爲你的異常添加堆棧跟蹤(不只是異常的文本)?這通常包含有價值的信息。 – Michiyo 2015-02-24 04:09:40
它已被添加! – Lucas 2015-02-24 04:39:11
這是來自不同異常的堆棧跟蹤 - 您通常從未在您的「AndroidManifest.xml」中聲明活動獲取的異常。您目前遇到哪些異常? – Michiyo 2015-02-24 04:43:50