我有一个 ViewPager，它是弹出窗口的一部分。当我第一次打开弹出窗口时，一切正常，但是当我用相同的数据第二次打开它时，出现 IllegalStateException 错误。

这是堆栈跟踪:

04-08 15:17:48.370: E/AndroidRuntime(10929): FATAL EXCEPTION: main 04-08 15:17:48.370: E/AndroidRuntime(10929): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.addViewInner(ViewGroup.java:3337) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.addView(ViewGroup.java:3208) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.support.v4.view.ViewPager.addView(ViewPager.java:920) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.addView(ViewGroup.java:3165) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.addView(ViewGroup.java:3145) 04-08 15:17:48.370: E/AndroidRuntime(10929): at com.componentix.imwizard.SamplePagerAdapter.instantiateItem(SamplePagerAdapter.java:22) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:649) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.support.v4.view.ViewPager.populate(ViewPager.java:783) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1280) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.support.v4.view.ViewPager.computeScroll(ViewPager.java:1176) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.drawChild(ViewGroup.java:2729) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.View.buildDrawingCache(View.java:10693) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.drawChild(ViewGroup.java:2747) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.View.draw(View.java:10981) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.View.getDisplayList(View.java:10417) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:2597) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.View.getDisplayList(View.java:10380) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:842) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewRootImpl.draw(ViewRootImpl.java:1910) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1634) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.os.Handler.dispatchMessage(Handler.java:99) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.os.Looper.loop(Looper.java:137) 04-08 15:17:48.370: E/AndroidRuntime(10929): at android.app.ActivityThread.main(ActivityThread.java:4430) 04-08 15:17:48.370: E/AndroidRuntime(10929): at java.lang.reflect.Method.invokeNative(Native Method) 04-08 15:17:48.370: E/AndroidRuntime(10929): at java.lang.reflect.Method.invoke(Method.java:511) 04-08 15:17:48.370: E/AndroidRuntime(10929): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792) 04-08 15:17:48.370: E/AndroidRuntime(10929): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:559) 04-08 15:17:48.370: E/AndroidRuntime(10929): at dalvik.system.NativeStart.main(Native Method)

这是我的代码:

public void showPopupWindow(Drawable picture)
{
    int imageResource = R.drawable.background;
    Drawable image = getResources().getDrawable(imageResource);
    popupLayout = new LinearLayout(context);
    popupLayout.setOrientation(LinearLayout.VERTICAL);
    popupLayout.setBackgroundResource(R.drawable.background);
    LayoutInflater ltInflater = getLayoutInflater();
    RelativeLayout rl = (RelativeLayout)ltInflater.inflate(R.layout.viewpager_layout, null);
    PagerContainer pagerContainer = (PagerContainer)(rl.getChildAt(0));
    CirclePageIndicator circlePageIndicator = (CirclePageIndicator)(rl.getChildAt(1));
    Button button = (Button)(rl.getChildAt(2));

    int maxWidth = 1;
    int maxHeight = 1;
    for (Drawable drawable: bigImages) {
        Bitmap bmp = drawableToBitmap(drawable);
        maxWidth = Math.max(maxWidth, bmp.getWidth());
        maxHeight = Math.max(maxHeight, bmp.getHeight());
    }

    ViewPager viewPager = pagerContainer.getViewPager();
    //viewPager.setBackgroundDrawable(image);

    ArrayList<ImageView> tmpImageViewsWithScreenshots = (ArrayList<ImageView>) imageViewsWithScreenshots.clone();
    SamplePagerAdapter pagerAdapter = new SamplePagerAdapter(tmpImageViewsWithScreenshots);
    viewPager.setAdapter(pagerAdapter);
    viewPager.setCurrentItem(imageIndex);
    circlePageIndicator.setViewPager(viewPager);
    circlePageIndicator.setCurrentItem(imageIndex);

    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            int childCount = checkboxLayout.getChildCount();
            for (int i = 0; i < childCount; ++i) {
                RelativeLayout currentLayout = (RelativeLayout) checkboxLayout
                        .getChildAt(i);
                int innerChildCount = currentLayout
                        .getChildCount();
                for (int j = 0; j < innerChildCount; ++j) {
                    View view = currentLayout.getChildAt(j);
                    view.setEnabled(true);
                }
            }
            imageViewLayout.setEnabled(true);
            lockableScrollView.setmScrollable(true);
            back.setEnabled(true);
            next.setEnabled(true);
            popupWindow.dismiss();
        }
    });
    popupLayout.addView(rl);
    LinearLayout.LayoutParams nlp= new LinearLayout.LayoutParams(450, 600);
    rl.setLayoutParams(nlp);
    popupWindow = new PopupWindow(popupLayout,
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT);
    int childCount = checkboxLayout.getChildCount();
    for (int i = 0; i < childCount; ++i) {
        RelativeLayout currentLayout = (RelativeLayout) checkboxLayout
                .getChildAt(i);
        int innerChildCount = currentLayout.getChildCount();
        for (int j = 0; j < innerChildCount; ++j) {
            View view = currentLayout.getChildAt(j);
            view.setEnabled(false);
        }
    }
    next.setEnabled(false);
    back.setEnabled(false);
    imageViewLayout.setEnabled(false);
    lockableScrollView.setmScrollable(false);
    popupWindow
            .showAtLocation(mainLayout, Gravity.CENTER, 0, 0);
    }

这是我的适配器的代码:

public class SamplePagerAdapter extends PagerAdapter{

    List<ImageView> pages = null;

    public SamplePagerAdapter(List<ImageView> pages){
        this.pages = pages;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position){
        View v = pages.get(position);
        //((ViewPager) collection).addView(v, 0);
        container.addView(v);
        return v;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object){
        container.removeView((View)object);
    }

    @Override
    public int getCount(){
        return pages.size();
    }

    @Override
    public boolean isViewFromObject(View view, Object object){
        return view.equals(object);
    }

}

有什么想法吗？

最佳答案

问题是在你的适配器方法 instantiateItem
你调用 container.addView(v);

但是每个View只能有一个父 View ，
因此它只能通过 addView(...) 添加到容器中一次。

当你第一次打开弹出窗口时，一切正常，因为v
那时没有 parent 。但是当你第二次打开你的弹出窗口时，
它再次将 View 添加到容器中。这会导致错误。

如果您关闭弹出 View 或从中删除所有 subview ，请尝试销毁 View
container.removeAllViews()

它应该可以工作了。

关于在 Android 中使用 ViewPager 时出现 java.lang.IllegalStateException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22936886/