Question

我有一个列表适配器

adapter = new SimpleCardStackAdapter(this);

       // System.gc(); i should call this function here or just before set adapter calling
        int i=0;
        if(cardModels.size() > VISIBLE_NUMBER_OF_CARDS){
            i = cardModels.size()-VISIBLE_NUMBER_OF_CARDS;
        }
        for ( ;i < cardModels.size(); i++) {
            //if(i<VISIBLE_NUMBER_OF_CARDS){
            adapter.add(cardModels.get(i));
            //}else{
            //    break;
            //}
        }

 // System.gc(); i should call this function or here 
        mCardContainer.setAdapter(adapter);

我的问题是适配器消耗内存在setadapter期间或创建适配器期间

我面临内存不足错误...适配器项目有一些大的位图我必须在内存消耗操作发生之前手动调用垃圾收集器谢谢。

Answer 1

您可以使用以下函数来获取与您想要加载它们的imageview大小相对应的位图...这有助于防止为较小的图像视图创建大位图甚至..

public static Bitmap decodeSampledBitmapFromResource(String filepath,
        int reqWidth, int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(filepath, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeFile(filepath, options);
}

public static int calculateInSampleSize(
        BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;

if (height > reqHeight || width > reqWidth) {

    final int halfHeight = height / 2;
    final int halfWidth = width / 2;

    // Calculate the largest inSampleSize value that is a power of 2 and keeps both
    // height and width larger than the requested height and width.
    while ((halfHeight / inSampleSize) > reqHeight
            && (halfWidth / inSampleSize) > reqWidth) {
        inSampleSize *= 2;
    }
}

return inSampleSize;

}

当适配器在列表视图中使用内存时，将适配器设置为listview或将值设置为适配器

1 个答案: