Reusing the bitmap variable after recycle

问题:

I have recycled the bitmap variable and when I again tried to use the same variable I have some strange errors with reference to recycle. Any solution to this issue ?

java code:

image1.recycle(); image1=null;

LogCat:

05-29 11:35:42.139: E/AndroidRuntime(695): java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@2bbad018
05-29 11:35:42.139: E/AndroidRuntime(695):  at android.graphics.Canvas.throwIfRecycled(Canvas.java:1038)
05-29 11:35:42.139: E/AndroidRuntime(695):  at android.graphics.Canvas.drawBitmap(Canvas.java:1078)

回答1:

You can have check before recycling the bitmap, as like :

if (img != null && !img.isRecycled()) 
            {
                img.recycle();
                img = null;
                System.gc(); 
            }

Here img is bitmap.

Try this type error is sloved.

回答2:

Returns an immutable bitmap from the specified subset of the source bitmap. The new bitmap may be the same object as source, or a copy may have been made.

It seems that the createBitmap functions have the potential to re-use the bitmap that you provided. If that is the case, then you shouldn't recycle the temporary bitmap since your final bitmap is using it. One thing you can do is

if(tempBitmap != finalBitmap) {
   tempBitmap.recycle();
}

That should only recycle the tempBitmap when it isn't the same as the finalBitmap. At least that seems to be what the documentation is implying.

回答3:

Once you recycle the bitmap its memory is freed. That's mean that bitmaps data are gone from the memory. If you want to use again the same variable you have to decode the Bitmap againg .

if (image1 == null || image1.isRecycled()) {
    image1 = BitmapFactory.decodeStream()
}