android 如何分析java.lang.IllegalArgumentException: Cannot draw recycled bitmaps异常

该类问题的分析,一般是需要找到bitmap对象在那个位置有被recyle，然后再检查代码。

如何定位到是在哪个代码位置有把bitmap 对象recyle，可以在 Bitmap.java的recycle方法中，加log打印出call stack来定位。



具体的修改参考如下：



public void recycle() {

if (!mRecycled) {

if (nativeRecycle(mNativeBitmap)) {

// return value indicates whether native pixel object was actually recycled.

// false indicates that it is still in use at the native level and these

// objects should not be collected now. They will be collected later when the

// Bitmap itself is collected.

mBuffer = null;

mNinePatchChunk = null;

}

mRecycled = true;



log.e("bitmap recyle! ", "this = " + this ,new Throwable("recycle"));

}

}



然后在抛 java.lang.IllegalArgumentException: Cannot draw recycled bitmaps 异常的地方，也将bitmap 对象打印出来。 抓取复现问题的mobile log 分析。



例如如下的log:



在main log中搜索“FATAL EXCEPTION”看到发生fatal error exception的 trace如下，对应的bitmap对象为 android.graphics.Bitmap@4218d0c8

01-01 08:03:23.841 2369 2369 D AndroidRuntime: Shutting down VM

01-01 08:03:23.841 2369 2369 W dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x40f979a8)

01-01 08:03:23.856 2369 2369 E AndroidRuntime: FATAL EXCEPTION: main

01-01 08:03:23.856 2369 2369 E AndroidRuntime: java.lang.IllegalArgumentException: Cannot draw recycled bitmapsandroid.graphics.Bitmap@4218d0c8

然后再在main log中搜索关键字 “@4218d0c8” ，就可以看到该对象被recyle的call stack



01-01 08:03:22.741 2369 2369 E bitmap recyle! : this = android.graphics.Bitmap@4218d0c8

01-01 08:03:22.741 2369 2369 E bitmap recyle! : java.lang.Throwable: recycle

01-01 08:03:22.741 2369 2369 E bitmap recyle! : at android.graphics.Bitmap.recycle(Bitmap.java:214)

01-01 08:03:22.741 2369 2369 E bitmap recyle! : at com.xxx.xxxx.xxxActivity.onDestroy(xxxActivity.java:190)

01-01 08:03:22.741 2369 2369 E bitmap recyle! : at android.app.Fragment.performDestroy(Fragment.java:1908)

......