Gradient 在 Android M 上因 IllegalArgumentException 而崩溃

Question

在我的应用中，我使用渐变背景。我曾经用我的手机在 Lollipop 上调试它，一切正常。今天我将我的手机 (LG G4) 更新为 Marshmallow，现在当假设绘制渐变时，应用程序崩溃并显示以下堆栈跟踪：

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.max.lucas, PID: 28163
                  java.lang.IllegalArgumentException: color and position arrays must be of equal length
                      at android.graphics.LinearGradient.<init>(LinearGradient.java:58)
                      at android.graphics.drawable.GradientDrawable.ensureValidRect(GradientDrawable.java:942)
                      at android.graphics.drawable.GradientDrawable.draw(GradientDrawable.java:516)
                      at android.view.View.getDrawableRenderNode(View.java:16451)
                      at android.view.View.drawBackground(View.java:16387)
                      at android.view.View.draw(View.java:16197)
                      at android.view.View.updateDisplayListIfDirty(View.java:15202)
                      at android.view.View.draw(View.java:15976)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:3611)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3401)
                      at android.view.View.updateDisplayListIfDirty(View.java:15197)
                      at android.view.View.draw(View.java:15976)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:3611)
                      at android.support.v7.widget.RecyclerView.drawChild(RecyclerView.java:3588)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3401)
                      at android.view.View.draw(View.java:16209)
                      at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:3097)
                      at android.view.View.updateDisplayListIfDirty(View.java:15202)
                      at android.view.View.draw(View.java:15976)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:3611)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3401)
                      at android.view.View.draw(View.java:16209)
                      at android.support.design.internal.ScrimInsetsFrameLayout.draw(ScrimInsetsFrameLayout.java:82)
                      at android.view.View.updateDisplayListIfDirty(View.java:15202)
                      at android.view.View.draw(View.java:15976)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:3611)
                      at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1229)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3401)
                      at android.view.View.draw(View.java:16209)
                      at android.view.View.updateDisplayListIfDirty(View.java:15202)
                      at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3595)
                      at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3575)
                      at android.view.View.updateDisplayListIfDirty(View.java:15162)
                      at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3595)
                      at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3575)
                      at android.view.View.updateDisplayListIfDirty(View.java:15162)
                      at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3595)
                      at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3575)
                      at android.view.View.updateDisplayListIfDirty(View.java:15162)
                      at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3595)
                      at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3575)
                      at android.view.View.updateDisplayListIfDirty(View.java:15162)
                      at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3595)
                      at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3575)
                      at android.view.View.updateDisplayListIfDirty(View.java:15162)
                      at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:281)
                      at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:287)
                      at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:322)
                      at android.view.ViewRootImpl.draw(ViewRootImpl.java:2655)
                      at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2469)
                      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2098)
                      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1125)
                      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6100)
                      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
                      at android.view.Choreographer.doCallbacks(Choreographer.java:670)
                      at android.view.Choreographer.doFrame(Choreographer.java:606)
                      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
                      at android.os.Handler.handleCallback(Handler.java:739)
                      at android.os.Handler.dispatchMessage(Handler.java:95)
                      at android.os.Looper.loop(Looper.java:148)
                  at android.app.ActivityThread.main

我注意到只有在渐变的属性引用 AppTheme 值时才会发生崩溃，如下所示：

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <gradient
        android:startColor="?attr/colorPrimary"
        android:centerColor="#000066"
        android:endColor="?attr/colorPrimary"
        android:type="linear"
        android:angle="135"/>
</shape>

具有固定值的渐变效果很好：

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <gradient
        android:startColor="#3F51B5"
        android:centerColor="#4CAF50"
        android:endColor="#3F51B5"
        android:type="linear"
        android:angle="135"/>
</shape>

这是什么原因造成的，我该如何解决？

Answer 1

一个可能较晚的答案，但可能对未来的开发人员有所帮助。 对于那些类型的渐变文件，请始终努力使用相同的颜色格式。 例如，如果您使用的是 Hex 值，请全部使用

<gradient
    android:startColor="#3F51B5"
    android:centerColor="#4CAF50"
    android:endColor="#3F51B5"/>

你们中的一些人正在引用主题颜色，

<gradient
    android:startColor="?attr/colorPrimary"
    android:centerColor="?attr/colorAccent"
    android:endColor="?attr/colorPrimary"/>