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android - 插入内部存储后如何使图库中的图像可见？

问题描述

我刚刚在我的内部存储中插入了一些图片，但它们在画廊中不可见。

有人可以解释我为什么吗？

这是我的代码：


    File photosFolder = new File(getContext().getExternalFilesDir(null),"myPictures");
            photosFolder.mkdirs();
            String[] pictures = null;
            try {
                pictures = assetManager.list("photos");
            } catch (IOException e) {
                Log.e("tag", "Failed to get asset file list.", e);
            }
            for(String filename : pictures) {
                InputStream in = null;
                OutputStream out = null;
                try {
                    in = assetManager.open("photos/"+filename);
                    File outFile = new File(photosFolder, filename);
                    out = new FileOutputStream(outFile);
                    copyFile(in, out);
                    in.close();
                    in = null;
                    out.flush();
                    out.close();
                    out = null;
                    MediaScannerConnection.scanFile(getContext(), new String[]{outFile.toString()}, null, new MediaScannerConnection.OnScanCompletedListener() {
                        @Override
                        public void onScanCompleted(String path, Uri uri) {
                            Log.i("External Storage", "Scanned"+ path +":");
                            Log.i("External Storage", "uri "+uri);
                        }
                    });
                } catch(IOException e) {
                    Log.e("tag", "Failed to copy asset file: " + filename, e);
                }
            }

我对此没有任何结果，有什么帮助吗？

标签： androidassetsinternal-storage

解决方案

试试这个：

File photosFolder = null;
if(Build.VERSION_CODES.R>Build.VERSION.SDK_INT) {
    photosFolder = new File(Environment.getExternalStorageDirectory(), "myPictures");//this will create a seperate directory in your external storage if you are using android 10 device
}
else
{
    photosFolder=new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath(),"myPictures");//though depreciated it still works.In android 11 you can create your directory inside public directories using this method.
}
if (!file.exists()) {
    file.mkdir();
}

String[] pictures = null;

try {
    pictures = assetManager.list("photos");
} catch (IOException e) {
    Log.e("tag", "Failed to get asset file list.", e);
}
for(String filename : pictures) {
    InputStream in = null;
    OutputStream out = null;
    try {
        in = assetManager.open("photos/"+filename);
        File outFile = new File(photosFolder, filename);
        out = new FileOutputStream(outFile);
        copyFile(in, out);
        in.close();
        in = null;
        out.flush();
        out.close();
        out = null;
        MediaScannerConnection.scanFile(this,
                new String[] { outFile.toString() }, null,
                new MediaScannerConnection.OnScanCompletedListener() {
                    public void onScanCompleted(String path, Uri uri) {
                        Log.i("ExternalStorage", "Scanned " + path + ":");
                        Log.i("ExternalStorage", "-> uri=" + uri);
                    } catch(IOException e) {
                        Log.e("tag", "Failed to copy asset file: " + filename, e);
                    }
                }
    }

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