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

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 android.graphics.Bitmap@XXXXX 	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

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

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又相应在找到GLES20Canvas.java:599的问题：

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：

	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		try{
			super.onDraw(canvas);
		}catch(Exception e){
		}
	}

2、在使用BitmapDrawable对象的时候能够，进行先将传递的bitmap对象推断。并在显示图片之前不要进行回收，直到使用完在回收。这样的不建议，由于图片多会出现OOM