插入内部存储后如何使图库中的图像可见？

Question

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。

谁能解释一下为什么？

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？

Answer 1

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);
        }
    }
     
        }

您可以在这里查看文档：https://developer.android.com/reference/android/os/Environment.html#getExternalStoragePublicDirectory%28java.lang.String%29