Question

我一直在开发相机应用程序，我希望它是当我按下“捕获”按钮时拍摄照片并将其保存到SD卡中，以便可以在库中查看。

然而目前它无法保存我想要的方式。目前，当我按下捕获时，它会拍照，但是在完全重新启动手机后，图片才显示在图库中。

这个问题一直困扰着我好几个星期，我大部分时间都遵循了android给出的教程。

这是我处理图片的主类的代码。

 private PictureCallback mPicture = new PictureCallback() 
   {

    @Override
    public void onPictureTaken(byte[] data, Camera camera)
      {
        File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
        if (pictureFile == null){
           Log.d(TAG, "Error creating media file, check storage permissions: ");
            return;
        }

        try {
            FileOutputStream fos = new FileOutputStream(pictureFile);
            fos.write(data);
            fos.close();
        } catch (FileNotFoundException e) {
          //  Log.d(TAG, "File not found: " + e.getMessage());
        } catch (IOException e) {
        //    Log.d(TAG, "Error accessing file: " + e.getMessage());
        }
    }
};


private static File getOutputMediaFile(int type){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this.

    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
              Environment.DIRECTORY_PICTURES), "MyCameraApp");
    // This location works best if you want the created images to be shared
    // between applications and persist after your app has been uninstalled.

    // Create the storage directory if it does not exist
    if (! mediaStorageDir.exists()){
        if (! mediaStorageDir.mkdirs()){
            Log.d("MyCameraApp", "failed to create directory");
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE){
        mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "IMG_"+ timeStamp + ".jpg");
    } else if(type == MEDIA_TYPE_VIDEO) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "VID_"+ timeStamp + ".mp4");
    } else {
        return null;
    }

    return mediaFile;
}

public void onClick(View v) {

    mCamera.takePicture(null, null, mPicture);
    Context context = getApplicationContext();
    CharSequence text = "Click Detected";
    int duration = Toast.LENGTH_SHORT;

    Toast toast = Toast.makeText(context, text, duration);
    toast.show();

  }

单击捕获时，我的日志cat显示以下内容

等级：E 标签：相机文本：在CAMERA_MSG_RAW_IMAGE的handlemessage中

我的权限是

uses-permission android:name="android.permission.CAMERA"
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"

非常感谢任何帮助。感谢

Answer 1

此问题与Image, saved to sdcard, doesn't appear in Android's Gallery app重复（特别是ShadowGod的答案）

要修复代码，请在fos.close（）

之后将以下内容添加到onPictureTaken

File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
    Environment.DIRECTORY_PICTURES), "MyCameraApp");
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, 
    Uri.parse("file://"+ mediaStorageDir)));

Answer 2

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

似乎不适用于KITKAT。它会抛出权限拒绝异常并导致应用程序崩溃。所以为此，我做了以下工作，

String path = mediaStorageDir.getPath() + File.separator
                + "IMG_Some_name.jpg";
CameraActivity.this.sendBroadcast(new Intent(
                         Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri
                        .parse("file://" + path)));

希望它有所帮助。

Answer 3

MediaScannerConnection适用于使用KitKat中的视频或图像更新图库，示例和代码列于：

Image, saved to sdcard, doesn't appear in Android's Gallery app

Android MediaStore insertVideo

http://developer.android.com/reference/android/media/MediaScannerConnection.html

在重新启动手机之前，Android自定义相机应用图片不会显示在图库中

3 个答案: