Let Volley's NetworkImageView show local image files

Question

I am using NetworkImageView to show some covers downloaded from a remote URL and I successfully manage to cache and show them, but I want to let users set their

Answer 1

Thank you for your answer. I wrote some code based on your help.

usage: just use LocalImageCache.class as Cache. No more code to change.

private ImageLoader mLocalImageLoader;

mLocalImageLoader = new ImageLoader(mRequestQueue,
            new LocalImageCache(mCtx));

NetworkImageView test = (NetworkImageView) findViewById(R.id.iv_test);  

test.setImageUrl("/storage/emulated/0/DCIM/Philm/2017_03_24_01_.png", MySingleton.getInstance(this.getApplicationContext()).getLocalImageLoader());

---

public class LocalImageCache extends LruCache implements ImageLoader.ImageCache {

public LocalImageCache(int maxSize) {
    super(maxSize);
}

public LocalImageCache(Context ctx) {
    this(getCacheSize(ctx));
}

@Override
public Bitmap getBitmap(String key) {
    key = key.substring(key.indexOf("/"));
    Bitmap result = get(key);
    Log.d("TAG", key);
    if (result == null) {
        Bitmap temp =  BitmapFactory.decodeFile(key);
        put(key, temp);
        return temp;
    } else {
        return result;
    }
}

@Override
public void putBitmap(String key, Bitmap bitmap) {
    // Here you can add an actual cache
    // Never touch here
}

// 默认屏幕5倍的图片缓存
// Returns a cache size equal to approximately three screens worth of images.
public static int getCacheSize(Context ctx) {
    final DisplayMetrics displayMetrics = ctx.getResources().
            getDisplayMetrics();
    final int screenWidth = displayMetrics.widthPixels;
    final int screenHeight = displayMetrics.heightPixels;
    // 4 bytes per pixel
    final int screenBytes = screenWidth * screenHeight * 4;

    return screenBytes * 5;
}

@Override
protected int sizeOf(String key, Bitmap value) {
    return value.getRowBytes() * value.getHeight();
}

}