java - 我怎样才能清除不断增长的堆？

Question

我有一个项目，它通过单击来演示 ImageViews 和它们的动画。它被实现为带有 go_in 和 go_out 动画的 ViewFlipper。每个 ImageView 都以 XML 的形式显示在每张演示文稿的幻灯片中。应用程序是为 Android 3.0 及更高版本的标签制作的。堆的大小随着每次切换而增长，logcat 看起来像(在 dalvik 给出错误之前:oof)...

I/dalvikvm-heap(5313): Grow heap (frag case) to 205.584MB for 3850256-byte allocation
D/dalvikvm(5313): GC_CONCURRENT freed 0K, 1% free 210440K/210759K, paused 2ms+9ms
I/MediaPlayer(5313): prepareAsync called in state 4
D/dalvikvm(5313): GC_FOR_ALLOC freed 166K, 1% free 210478K/210887K, paused 29ms
I/dalvikvm-heap(5313): Grow heap (frag case) to 209.293MB for 3850256-byte allocation
D/dalvikvm(5313): GC_FOR_ALLOC freed <1K, 1% free 214238K/214663K, paused 33ms
D/dalvikvm(5313): GC_CONCURRENT freed <1K, 1% free 214238K/214663K, paused 3ms+10ms
D/dalvikvm(5313): GC_FOR_ALLOC freed 4K, 1% free 214838K/215303K, paused 32ms
I/dalvikvm-heap(5313): Grow heap (frag case) to 213.551MB for 3850256-byte allocation
D/dalvikvm(5313): GC_FOR_ALLOC freed 0K, 1% free 218598K/219079K, paused 33ms
D/dalvikvm(5313): GC_CONCURRENT freed <1K, 1% free 218598K/219079K, paused 1ms+10ms
I/MediaPlayer(5313): prepareAsync called in state 4
D/dalvikvm(5313): GC_FOR_ALLOC freed 7K, 1% free 220438K/220743K, paused 29ms
D/dalvikvm(5313): GC_FOR_ALLOC freed 2K, 1% free 222253K/222535K, paused 29ms
D/dalvikvm(5313): GC_FOR_ALLOC freed <1K, 1% free 222634K/222855K, paused 33ms
I/dalvikvm-heap(5313): Grow heap (frag case) to 221.165MB for 3850256-byte allocation 

那么，问题是——如何清空堆或重新启动应用程序？或者如何组织不给它增加堆的应用程序？

这是我使用的代码

ImageView buttonNext_13 = (ImageView)findViewById(R.id.Button_next_13);
buttonNext_13.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view131) {
        flipper.setInAnimation(AnimationUtils.loadAnimation(
            view131.getContext(), R.anim.go_next_in));
        flipper.setOutAnimation(AnimationUtils.loadAnimation(
            view131.getContext(), R.anim.go_next_out));
        flipper.showNext();
        mp_file.release();
        mp_file = MediaPlayer.create(getApplicationContext(), R.raw.theme);
        mp_file.start();
        return;
    }
});
ImageView buttonPrevious_13 = (ImageView)findViewById(R.id.button_preious13);
buttonPrevious_13.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view132) {
        flipper.setInAnimation(AnimationUtils.loadAnimation(
            view132.getContext(), R.anim.go_prev_in));
        flipper.setOutAnimation(AnimationUtils.loadAnimation(
            view132.getContext(), R.anim.go_prev_out));
        flipper.showPrevious();
        return;
    }
});

Answer 1

请使用以下代码，

BitmapFactory.Options bfOptions=new BitmapFactory.Options();
bfOptions.inDither=false;                     //Disable Dithering mode
bfOptions.inPurgeable=true;                   //Tell to gc that whether it needs free memory, the Bitmap can be cleared
bfOptions.inInputShareable=true;              //Which kind of reference will be used to recover the Bitmap data after being clear, when it will be used in the future
bfOptions.inTempStorage=new byte[32 * 1024]; 
CameraTricks.SdCardImage= BitmapFactory.decodeFile(CameraTricks.yu,bfOptions);

CameraTricks.yu 是我的位图之路