android - 如何将全高清图像设置为 ImageView

Question

我想将全高清 (1080x1920) 图像设置到 ImageView。我已经搜索过但没有有效的方法。

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 options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    Log.d("DUE","Options height: " + height + " - width: " + width);
    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;
}

或者:

private Bitmap resize(int resId, int width, int height){

    BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
    bmpFactoryOptions.inJustDecodeBounds = true;
    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), resId, bmpFactoryOptions);

    int heightRatio = (int)Math.ceil(bmpFactoryOptions.outHeight/(float)height);
    int widthRatio = (int)Math.ceil(bmpFactoryOptions.outWidth/(float)width);

    if (heightRatio > 1 || widthRatio > 1)
    {
        if (heightRatio > widthRatio)
        {
            bmpFactoryOptions.inSampleSize = heightRatio;
        } else {
            bmpFactoryOptions.inSampleSize = widthRatio;
        }
    }else{
    }

    bmpFactoryOptions.inJustDecodeBounds = false;
    bitmap = BitmapFactory.decodeResource(getResources(), resId, bmpFactoryOptions);
    return bitmap;
}

我想显示原始图像大小，而不缩小图像大小

你能帮帮我吗？

谢谢大家!

Answer 1

You can use image loading libraries like Universal Image Loader, Fresco.
1) https://github.com/nostra13/Android-Universal-Image-Loader
2) https://github.com/facebook/fresco
3) https://guides.codepath.com/android/Displaying-Images-with-the-Fresco-Library