Activity中bitmap的回收

最新推荐文章于 2024-09-05 16:27:11 发布

原创最新推荐文章于 2024-09-05 16:27:11 发布 · 1.4k 阅读

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#Android #bitmap #imageview

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本文探讨了在Activity中如何有效地回收Bitmap资源，包括通过`recycleAllImages`方法进行全局回收，以及针对View中Bitmap的特定回收策略，旨在解决内存泄漏问题，优化应用性能。

1.Activity中Bitmap的回收

public void recycleAllImages () {

         Logger.d("---------recycleView=====::" + getClass().getSimpleName());

         View decorView = getWindow().getDecorView();
         recycleViewImages(decorView);
        }

2.View中Bitmap的回收

        public void recycleViewImages(View view) {

         if (view == null) {
          return ;
         }

         Logger.d("---------recycleView=====:" + view.getClass().getSimpleName());


         Drawable bgDrawable = view.getBackground();
      if (bgDrawable != null && bgDrawable instanceof BitmapDrawable) {
       BitmapDrawable bd = (BitmapDrawable) bgDrawable;
       if (bd != null) {
        if (bd.getBitmap() != null) {
         bd.getBitmap().recycle();
        }
       }
      }


         if (view instanceof ViewGroup) {
          ViewGroup group = (ViewGroup) view;
          for (int i=0; i<group.getChildCount(); i++) {
           recycleViewImages(group.getChildAt(i));
          }


         } else {
          if (view instanceof ImageView || view instanceof ImageButton) {
           ImageView iv = (ImageView) view;
           Drawable drawable = iv.getDrawable();
           if (drawable != null && drawable instanceof BitmapDrawable) {
            BitmapDrawable bd = (BitmapDrawable) drawable;
            if (bd != null) {
             if (bd.getBitmap() != null) {
              bd.getBitmap().recycle();
             }
            }
           }
          }
         }
        }