OutOfMemoryError android bitmap listview

Question

在我的应用程序中，我使用SQLite数据库来存储大量图像的数据。某些图像可以达到600x600像素。我使用自定义列表来创建位图。我知道有一个方法bitmap.recycle（）;但我不知道如何在listview中使用它。

Answer 1

这里是处理位图在Android中

首先，你要计算出位的sampleBitmapSize的解决方案（加载相同的位图的较低版本）

public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, 
     int reqWidth, int reqHeight) { 

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

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

    // Decode bitmap with inSampleSize set 
    options.inJustDecodeBounds = false; 
    return BitmapFactory.decodeResource(res, resId, options); 
} 

下面是UTIL功能计算InSampleSize（一个定义位图质量值（评分）的整数）。

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; 
     } 
    } 

    Log.i("ImageUtil", "InSampleSize: "+inSampleSize); 
    return inSampleSize; 
}