Canvas: trying to use a recycled bitmap android.graphics.Bitmap@XXX _graphics

听闻少年二字，当与平庸相斥。这篇文章主要讲述Canvas: trying to use a recycled bitmap android.graphics.Bitmap@XXX相关的知识，希望能为你提供帮助。
近期在做和图片相关显示的出现了一个问题，整理一下思路。分享出来给大家參考一下：

Exception Type:java.lang.RuntimeException java.lang.RuntimeException: Canvas: trying to use a recycled bitmap [email protected]at android.graphics.Canvas.throwIfCannotDraw(Canvas.java:1282) at android.view.GLES20Canvas.drawBitmap(GLES20Canvas.java:599) at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:538) at android.widget.ImageView.onDraw(ImageView.java:1176) at android.view.View.draw(View.java:15285) at android.view.View.updateDisplayListIfDirty(View.java:14208) at android.view.View.getDisplayList(View.java:14230) at android.view.View.draw(View.java:15013) at android.view.ViewGroup.drawChild(ViewGroup.java:3409) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3202) at android.view.View.draw(View.java:15288) at android.widget.FrameLayout.draw(FrameLayout.java:598) at android.view.View.updateDisplayListIfDirty(View.java:14208) at android.view.View.getDisplayList(View.java:14230) at android.view.View.draw(View.java:15013) at android.view.ViewGroup.drawChild(ViewGroup.java:3409) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3202) at android.view.View.updateDisplayListIfDirty(View.java:14203) at android.view.View.getDisplayList(View.java:14230) at android.view.View.draw(View.java:15013) at android.view.ViewGroup.drawChild(ViewGroup.java:3409) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3202) at android.view.View.updateDisplayListIfDirty(View.java:14203) at android.view.View.getDisplayList(View.java:14230) at android.view.View.draw(View.java:15013) at android.view.ViewGroup.drawChild(ViewGroup.java:3409) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3202) at android.view.View.updateDisplayListIfDirty(View.java:14203) at android.view.View.getDisplayList(View.java:14230) at android.view.View.draw(View.java:15013) at android.view.ViewGroup.drawChild(ViewGroup.java:3409) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3202) at android.view.View.updateDisplayListIfDirty(View.java:14203) at android.view.View.getDisplayList(View.java:14230) at android.view.View.draw(View.java:15013) at android.view.ViewGroup.drawChild(ViewGroup.java:3409) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3202) at android.view.View.updateDisplayListIfDirty(View.java:14203) at android.view.View.getDisplayList(View.java:14230) at android.view.View.draw(View.java:15013) at android.view.ViewGroup.drawChild(ViewGroup.java:3409) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3202) at android.view.View.draw(View.java:15288) at android.widget.FrameLayout.draw(FrameLayout.java:598) at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2799) at android.view.View.updateDisplayListIfDirty(View.java:14208) at android.view.View.getDisplayList(View.java:14230) at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:273) at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:279) at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:318) at android.view.ViewRootImpl.draw(ViewRootImpl.java:2552) at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2368) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1998) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1077) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5966) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:786) at android.view.Choreographer.doCallbacks(Choreographer.java:599) at android.view.Choreographer.doFrame(Choreographer.java:569) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:772) at android.os.Handler.handleCallback(Handler.java:743) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5299) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)

基本的跟踪方向

at android.view.GLES20Canvas.drawBitmap(GLES20Canvas.java:599) at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:538) at android.widget.ImageView.onDraw(ImageView.java:1176)

在这ImageView和BitmapDrawable、GLES20Canvas三个类报出异常信息。在找到ImageView代码中，发现了OnDraw的方法的mDrawable.draw(canvas); 这一句出现了错

Canvas: trying to use a recycled bitmap android.graphics.Bitmap@XXX

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有接着在BitmapDrawable的OnDraw方法发现了错误行canvas.drawBitmap(bitmap, null, mDstRect, paint); ：

又相应在找到GLES20Canvas.java:599的问题：

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【Canvas: trying to use a recycled bitmap android.graphics.Bitmap@XXX】立即找到了问题所在：

protected static void throwIfCannotDraw(Bitmap bitmap) { if (bitmap.isRecycled()) { throw new RuntimeException(" Canvas: trying to use a recycled bitmap " + bitmap); } if (!bitmap.isPremultiplied() & & bitmap.getConfig() == Bitmap.Config.ARGB_8888 & & bitmap.hasAlpha()) { throw new RuntimeException(" Canvas: trying to use a non-premultiplied bitmap " + bitmap); } }

因此：能够说明：假设bitmap对象已经被回收了，可是BitmapDrawable的对象还在Canvas上绘制导致了跑出了该异常情况。
解决方式：
1、能够写一个集成ImageView的子类，单后复写onDraw（）方法捕获此异常：