java - Androidstudio视图添加和删除问题
问题描述
我在 5 天前开始使用 AStudio，目前正在尝试制作 CardView 刷卡系统，我希望它是无限的。所以，有两张卡片 1 和 2，1 超过 2，当 1 被滑动时，我将其移除，并在 2 后面添加 3。
private void regenCard(View v) {
View cardToShow = (View)cardList.get((counter+2)%cardList.size());
cardToShow.setTranslationZ(400000-counter);
myLayout.removeViewAt(2);
myLayout.addView(cardToShow,3);
counter++;
}
注意：前两张卡在 MainActivity 中初始化（我知道这并不漂亮）我希望通过删除 1（在索引 2 处）2 会转到索引 2，这样我就可以在它们之后添加 3。MainActivity 的结构是这样的：
相对布局
0. ImageView
1. Relative Layout
2. Card 1
3. Card 2
但是当我运行应用程序时，我只能刷一张卡，第二张让我崩溃
E/InputEventReceiver: Exception dispatching input event.
E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
E/MessageQueue-JNI: 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:5235)
at android.view.ViewGroup.addView(ViewGroup.java:5064)
at android.view.ViewGroup.addView(ViewGroup.java:5004)
at com.isparks.project.MyOnTouchListener.regenCard(MyOnTouchListener.java:133)
at com.isparks.project.MyOnTouchListener.next(MyOnTouchListener.java:120)
at com.isparks.project.MyOnTouchListener.onTouch(MyOnTouchListener.java:76)
at android.view.View.dispatchTouchEvent(View.java:14305)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3112)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2785)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3140)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:488)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1871)
at android.app.Activity.dispatchTouchEvent(Activity.java:4125)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:446)
at android.view.View.dispatchPointerEvent(View.java:14568)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6016)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5819)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5310)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5485)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5542)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8080)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8031)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7992)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:8203)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:220)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:335)
at android.os.Looper.loop(Looper.java:183)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.isparks.project, PID: 17652
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:5235)
at android.view.ViewGroup.addView(ViewGroup.java:5064)
at android.view.ViewGroup.addView(ViewGroup.java:5004)
at com.isparks.project.MyOnTouchListener.regenCard(MyOnTouchListener.java:133)
at com.isparks.project.MyOnTouchListener.next(MyOnTouchListener.java:120)
at com.isparks.project.MyOnTouchListener.onTouch(MyOnTouchListener.java:76)
at android.view.View.dispatchTouchEvent(View.java:14305)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3112)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2785)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3140)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:488)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1871)
at android.app.Activity.dispatchTouchEvent(Activity.java:4125)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:446)
at android.view.View.dispatchPointerEvent(View.java:14568)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6016)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5819)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5310)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5485)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5542)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8080)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8031)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7992)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:8203)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:220)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:335)
at android.os.Looper.loop(Looper.java:183)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
I/Process: Sending signal. PID: 17652 SIG: 9E/InputEventReceiver: Exception dispatching input event.
E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
E/MessageQueue-JNI: 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:5235)
at android.view.ViewGroup.addView(ViewGroup.java:5064)
at android.view.ViewGroup.addView(ViewGroup.java:5004)
at com.isparks.project.MyOnTouchListener.regenCard(MyOnTouchListener.java:133)
at com.isparks.project.MyOnTouchListener.next(MyOnTouchListener.java:120)
at com.isparks.project.MyOnTouchListener.onTouch(MyOnTouchListener.java:76)
at android.view.View.dispatchTouchEvent(View.java:14305)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3112)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2785)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3140)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:488)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1871)
at android.app.Activity.dispatchTouchEvent(Activity.java:4125)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:446)
at android.view.View.dispatchPointerEvent(View.java:14568)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6016)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5819)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5310)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5485)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5542)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8080)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8031)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7992)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:8203)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:220)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:335)
at android.os.Looper.loop(Looper.java:183)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.isparks.project, PID: 17652
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:5235)
at android.view.ViewGroup.addView(ViewGroup.java:5064)
at android.view.ViewGroup.addView(ViewGroup.java:5004)
at com.isparks.project.MyOnTouchListener.regenCard(MyOnTouchListener.java:133)
at com.isparks.project.MyOnTouchListener.next(MyOnTouchListener.java:120)
at com.isparks.project.MyOnTouchListener.onTouch(MyOnTouchListener.java:76)
at android.view.View.dispatchTouchEvent(View.java:14305)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3112)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2785)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3140)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:488)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1871)
at android.app.Activity.dispatchTouchEvent(Activity.java:4125)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:446)
at android.view.View.dispatchPointerEvent(View.java:14568)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6016)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5819)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5310)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5485)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5542)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8080)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8031)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7992)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:8203)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:220)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:335)
at android.os.Looper.loop(Looper.java:183)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
I/Process: Sending signal. PID: 17652 SIG: 9
预先感谢您的帮助
解决方案
根据错误，需要调用removeView().
在您的代码中，在调用“ myLayout.addView”之前，添加以下行
if(cardToShow.getParent() != null) {
((ViewGroup)cardToShow.getParent()).removeView(cardToShow);
}
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