Question

我想以编程方式在ImageView中添加一些linearLayout。但应用程序崩溃超过2个图像。它的错误是 OutOfMemoryError。

String[] titleImages={"a","b","c","d","e","f","g"};
for (String title : titleImages){

        InputStream inputStream = context.getAssets()
                .open("titles"+"/"+title);
        Drawable drawable = Drawable.createFromStream(inputStream, null);
        inputStream.close();

        ImageView imageView = new ImageView(_context);
        imageView.setScaleType(ScaleType.FIT_XY);
            imageView.setImageDrawable(drawable);
        //more imageView set properties
        LinearLayout shelf=findViewById(R.id.shelf);
        //shelf is a LinearLayout
        shelf.addView(imageView);
    }

Answer 1

使用较小的图像。

或者，使用BitmapFactory.Options，特别是其inSampleSize选项，将图片缩减为适合您屏幕尺寸的内容。

或者，使用可以为您处理inSampleSize的第三方图片加载库，例如Picasso。

Answer 2

通过使用这些方法，您可以根据使用情况调整图像大小。

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);

}

public static int calculateInSampleSize（ BitmapFactory.Options选项，int reqWidth，int reqHeight）{ //图像的原始高度和宽度 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;

}

以编程方式添加imageView时出现OutOfMemoryError

2 个答案: