画布：尝试在Android2.3上使用回收的位图RuntimeException

Question

06-27 10:57:48.420: E/AndroidRuntime(14255): FATAL EXCEPTION: main
06-27 10:57:48.420: E/AndroidRuntime(14255): java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@407fc6b8
06-27 10:57:48.420: E/AndroidRuntime(14255):    at android.graphics.Canvas.throwIfRecycled(Canvas.java:955)
06-27 10:57:48.420: E/AndroidRuntime(14255):    at android.graphics.Canvas.drawBitmap(Canvas.java:1044)
06-27 10:57:48.420: E/AndroidRuntime(14255):    at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:325)
06-27 10:57:48.420: E/AndroidRuntime(14255):    at android.widget.ImageView.onDraw(ImageView.java:872)
etc etc

这是我的缓存：

 sLruCache =    new LinkedHashMap(capacity / 2, 0.75f, true) {
      private static final long serialVersionUID = -7282875042976381535L;

      @Override
      protected boolean removeEldestEntry(LinkedHashMap.Entry eldest) {
        if (size() > mCapacity) {
          return true;
        } else
          return false;
      }

      public Bitmap remove(Object key) {
        Bitmap bitmap = super.remove(key);
        if (bitmap != NULL_BITMAP) {
          bitmap.recycle();
        }
        return bitmap;
      };

      @Override
      public void clear() { 
        Set keys = new HashSet(keySet());
        for (String key : keys) {
          Bitmap map = get(key);
          if (map != NULL_BITMAP) {
            map.recycle();
          }
        }
        super.clear();
      }
    };

有什么想法为什么这会失败在Android2.3而不是4.0？

Answer 1

我也有同样的问题。

我必须删除所有bitmap.recycle（）调用。有时会导致OutOfMemoryException。

因此，我做了一个这样的黑客：

// when I need to remove bitmap from cache
if (Build.VERSION.SDK_INT < 9 || Build.VERSION.SDK_INT > 10) {
    bmp.recycle();
}