在Android中使用ViewPager时出现java.lang.IllegalStateException
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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,但是当我第二次用相同的数据打开它时,我有一个IllegalStateException错误.
这是一个堆栈跟踪：
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);
}
}
有任何想法吗？
解决方法:
问题是在您的适配器方法instantiateItem中
你调用container.addView(v);
但是每个View只能有一个父级,
所以它只能通过addView(…)添加到容器一次.
当你第一次打开弹出窗口时,一切正常,因为v
那个时间没有父母.但是当你第二次打开你的popupwinow时,
它再次将视图添加到容器中.这可以解决错误.
如果关闭弹出视图或从中删除所有子视图,请尝试销毁视图
container.removeAllViews()
它应该工作.
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