如何在照片后更新Android图库？

Question

对于大学,我将在面部检测器上开发一个Android应用程序.为此,我要在我的画廊中保存各种照片.问题是保存照片后,图库不会更新.更确切地说,如果我删除了我要保存图像的目录,我打开应用程序并拍摄照片,然后进入图库,在"更新"后我看到了照片.但是一旦我有了目录,如果我拍了一张新照片,就不会覆盖旧照片了.

在线我发现了这个:

    sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://" + Environment.getExternalStorageDirectory())));

......但它不起作用!

这是我的代码:

    .
    .
    .
      ImageButton buttonPicture = (ImageButton) findViewById(R.id.camera_surface_button);
                        buttonPicture.setOnClickListener(new OnClickListener(){
                                public void onClick(View v) {
                                        mCamera.takePicture(null, null, jpegCallback); 
                                        //File file = new File(savedPath, "ing.jpg");
                                        sendBroadcast(new         Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://" +     Environment.getExternalStorageDirectory())));

                                }
                        });
     .
     .
     .
     .

    PictureCallback jpegCallback = new PictureCallback() {
                public void onPictureTaken(byte[] _data, Camera _camera) {
                        imagesFolder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "/TTRprova");
                        imagesFolder.mkdirs();
                        String fileName = "image3.jpg";

                        File output = new File(imagesFolder, fileName);

                        textView1.setText("-----Sono nella callback-----");

                        Uri outputFileUri = Uri.fromFile(output);
                        String filePath = outputFileUri.getPath();
                        File file= new File(filePath);

                        try {
                            FileOutputStream fos = new FileOutputStream(file, true);
                            fos.write(_data);
                            fos.close();

                        } catch (FileNotFoundException e) {
                            // TODO Auto-generated catch block
                            textView1.setText("-----FileNotFoundException-----");
                            e.printStackTrace();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            textView1.setText("-----IOException-----");
                            e.printStackTrace();
                        }

                        //riparte la preview della camera
                        //mCamera.startPreview();



                }
    };

希望在你的帮助下.再见

Answer 1

您可以强制MediaScanner添加特定文件(或让它知道它已被删除或修改)

sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(myNewFile)));