android - 下载图像并保存它们但不希望它们出现在图库中

Question

我有一个聊天应用程序，我需要保存用户发送接收的图像。对于用户发送的图像，我将其保存到像这样的图像文件夹中

private void imageDownload(final String url){

    Picasso.with(getContext())
            .load(url)
            .into(getTarget(url));

}

//target to save
private static Target getTarget(final String url){
    Target target = new Target(){

        @Override
        public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
            new Thread(new Runnable() {

                @Override
                public void run() {

                    File heyJudeFile = new File(Environment.getExternalStorageDirectory().getPath() + "/Hey Jude");
                    if (!heyJudeFile.exists()){
                        heyJudeFile.mkdirs();
                    }

                            localProfilePictureAdress = Environment.getExternalStorageDirectory().getPath() + "/Hey Jude" + "/" + url.substring(url.lastIndexOf("/")+1);

                    File file = new File(localProfilePictureAdress);
                    try {
                        file.createNewFile();
                        FileOutputStream ostream = new FileOutputStream(file);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 80, ostream);
                        ostream.flush();
                        ostream.close();
                    } catch (IOException e) {
                        Log.e("IOException", e.getLocalizedMessage());
                    }
                }
            }).start();

        }

        @Override
        public void onBitmapFailed(Drawable errorDrawable) {

        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {

        }
    };
    return target;
}

但是对于用户收到的图像，我想保存这些图像，但我不希望这些图像在画廊中可见，这是如何工作的？

谢谢

Answer 1

使用下面的方法从图库中隐藏媒体

/* To Hide media file in gallery  */ 
public void createNoMedia(String myDir){

    File noMediaFile = new File(myDir, ".nomedia");
    if (!noMediaFile.exists()) {
        try { 
            noMediaFile.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        } 
    } 
}

/* To use this */
dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "/MyImages/";
File newDir = new File(dir);
newDir.mkdirs();
createNoMedia(dir);

并在 manifest.xml 中您还需要 WRITE_EXTERNAL_STORAGE 权限。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />