不能在独立的视图上启动这个animation师！ 揭示效应

我试图在我的应用程序中创build显示效果，但没有成功。 当我打开一个片段时，我想要的是显示卡片视图。 我到目前为止尝试的是：

private void toggleInformationView(View view) { infoContainer = view.findViewById(R.id.contact_card); int cx = (view.getLeft() + view.getRight()) / 2; int cy = (view.getTop() + view.getBottom()) / 2; float radius = Math.max(infoContainer.getWidth(), infoContainer.getHeight()) * 2.0f; if (infoContainer.getVisibility() == View.INVISIBLE) { infoContainer.setVisibility(View.VISIBLE); ViewAnimationUtils.createCircularReveal(infoContainer, cx, cy, 0, radius).start(); } else { Animator reveal = ViewAnimationUtils.createCircularReveal( infoContainer, cx, cy, radius, 0); reveal.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { infoContainer.setVisibility(View.INVISIBLE); } }); reveal.start(); } } 

并在onCreateView我开始的方法：

 toggleInformationView(view); 

这是cardview：

 <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:id="@+id/contact_card" android:visibility="invisible" android:layout_height="wrap_content" android:layout_margin="5dp" android:elevation="4dp" android:foreground="?android:attr/selectableItemBackground" android:orientation="vertical" android:padding="10dp" card_view:cardCornerRadius="2dp" > <LinearLayout android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content" > <ImageView android:id="@+id/bg_contact" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_weight="0" android:adjustViewBounds="true" android:scaleType="centerCrop" android:src="@drawable/banner" /> </LinearLayout> </android.support.v7.widget.CardView> 

和logcat：

 11-08 17:25:48.541: E/AndroidRuntime(26925): java.lang.IllegalStateException: Cannot start this animator on a detached view! 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.view.RenderNode.addAnimator(RenderNode.java:817) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.view.RenderNodeAnimator.setTarget(RenderNodeAnimator.java:277) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.view.RenderNodeAnimator.setTarget(RenderNodeAnimator.java:261) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.animation.RevealAnimator.<init>(RevealAnimator.java:37) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.view.ViewAnimationUtils.createCircularReveal(ViewAnimationUtils.java:48) 11-08 17:25:48.541: E/AndroidRuntime(26925): at com.as.asapp.TFragment.toggleInformationView(TFragment.java:64) 11-08 17:25:48.541: E/AndroidRuntime(26925): at com.as.asapp.TFragmentshowInformation(TFragment.java:52) 11-08 17:25:48.541: E/AndroidRuntime(26925): at com.as.asapp.TFragment.onCreateView(TFragment.java:37) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:454) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.os.Handler.handleCallback(Handler.java:739) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.os.Handler.dispatchMessage(Handler.java:95) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.os.Looper.loop(Looper.java:135) 11-08 17:25:48.541: E/AndroidRuntime(26925): at android.app.ActivityThread.main(ActivityThread.java:5221) 11-08 17:25:48.541: E/AndroidRuntime(26925): at java.lang.reflect.Method.invoke(Native Method) 11-08 17:25:48.541: E/AndroidRuntime(26925): at java.lang.reflect.Method.invoke(Method.java:372) 11-08 17:25:48.541: E/AndroidRuntime(26925): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 11-08 17:25:48.541: E/AndroidRuntime(26925): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 

检查，似乎getWidth()和getHeight()返回0.但我不知道这是否是真正的问题。 谢谢

Answer 1

这是我解决它的方法，我在onCreateViewcallback中添加了一个onLayoutChange监听器，所以每当它连接到视图并准备绘制时，它就会显示

 @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment final View view = inflater.inflate(R.layout.fragment_map_list, container, false); if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { view.addOnLayoutChangeListener(new View.OnLayoutChangeListener() { @TargetApi(Build.VERSION_CODES.LOLLIPOP) @Override public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) { v.removeOnLayoutChangeListener(this); toggleInformationView(view); } }); } return view; } 

Answer 2

你可以使用runnable来完成animation。 可运行模式将在视图创build后运行。

 view.post(new Runnable() { @Override public void run() { //create your anim here } }); 

Answer 3

如何简单地将该方法放在onViewCreated（）方法中：

 @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); toggleInformationView(view); } 

有用

Answer 4

除了Hitesh的答案。 最好使用https://developer.android.com/reference/android/support/v4/view/ViewCompat.html#isAttachedToWindow(android.view.View）;

 android.support.v4.view.ViewCompat boolean isAttachedToWindow (View view) 

例：

 LinearLayout rootView = null; rootView = (LinearLayout) findViewById(R.id.rootView); boolean isAttachedToWindow = ViewCompat.isAttachedToWindow(rootView); 

Answer 5

尝试在onViewCreated方法上调用它

Answer 6

使用ViewTreeObserver。

  ViewTreeObserver viewTreeObserver = rootLayout.getViewTreeObserver(); if (viewTreeObserver.isAlive()) { viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { revealActivity(revealX, revealY); rootLayout.getViewTreeObserver().removeOnGlobalLayoutListener(this); } }); } 

Answer 7

我使用自定义视图，所以我用isAttachedToWindow()方法来检查是否附加视图，避免做透视，而视图没有附加。