为什么Android渐变启动画面仅在5.0上导致即时重启？

Question

我使用从这里的解决方案，使我的申请一个渐变背景闪屏： how to get android gradient center light effect?

我使用张贴Vadym解决方案：

<item > 
    <shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="rectangle"> 
    <gradient 
     android:startColor="@android:color/transparent" 
     android:endColor="@android:color/black" 
     android:centerX="50%" 
     android:centerY="50%" 
     android:gradientRadius="100%" 
     android:type="radial"/> 
    </shape> 
</item> 

不幸的是，这是造成整个电话重启只能在Android 5.0上开机！不是5.1或4.4或6.0或7.0 发生了什么？我甚至不能评论Vadyms解决方案，因为我的声誉还不够。有人可以在评论中添加警告吗？

logcat的说：

08-10 09:50:57.395 22267-22292/system_process E/AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: android.display 
                  java.lang.IllegalArgumentException: radius must be > 0 
                   at android.graphics.RadialGradient.<init>(RadialGradient.java:57) 
                   at android.graphics.drawable.GradientDrawable.ensureValidRect(GradientDrawable.java:938) 
                   at android.graphics.drawable.GradientDrawable.draw(GradientDrawable.java:509) 
                   at android.graphics.drawable.LayerDrawable.draw(LayerDrawable.java:537) 
                   at android.view.View.drawBackground(View.java:15352) 
                   at android.view.View.draw(View.java:15105) 
                   at android.widget.FrameLayout.draw(FrameLayout.java:592) 
                   at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2606) 
                   at android.view.ViewRootImpl.drawSoftware(ViewRootImpl.java:2613) 
                   at android.view.ViewRootImpl.draw(ViewRootImpl.java:2526) 
                   at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2337) 
                   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1968) 
                   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054) 
                   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5786) 
                   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) 
                   at android.view.Choreographer.doCallbacks(Choreographer.java:580) 
                   at android.view.Choreographer.doFrame(Choreographer.java:550) 
                   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) 
                   at android.os.Handler.handleCallback(Handler.java:739) 
                   at android.os.Handler.dispatchMessage(Handler.java:95) 
                   at android.os.Looper.loop(Looper.java:135) 
                   at android.os.HandlerThread.run(HandlerThread.java:61) 
                   at com.android.server.ServiceThread.run(ServiceThread.java:46) 

Answer 1

对API 不接受％值。要解决此问题，您可以使用%p（https://developer.android.com/reference/android/graphics/drawable/GradientDrawable.html#attr_android:gradientRadius）

android:gradientRadius="100%p" 

Answer 2

试试这个;

System.runFinalization(); 
Runtime.getRuntime().gc(); 
System.gc();