private static final File DIRECTORY_PICTURES = new File(Environment.getExternalStorageDirectory(), Environment.DIRECTORY_PICTURES); 
private static final File DIRECTORY_DCIM = new File(Environment.getExternalStorageDirectory(), Environment.DIRECTORY_DCIM); 
 
if (manufacturer.equalsIgnoreCase("xiaomi")) { 
  DIRECTORY_SCREENSHOT = new File(DIRECTORY_DCIM, "Screenshots"); 
} else { 
  DIRECTORY_SCREENSHOT = new File(DIRECTORY_PICTURES, "Screenshots"); 
} 
 
FILE_OBSERVER = new FileObserver(DIRECTORY_SCREENSHOT.getPath(), FileObserver.ALL_EVENTS) { 
  @Override 
  public void onEvent(int event, String path) { 
    if (event == FileObserver.CREATE) { 
      String newPath = new File(DIRECTORY_SCREENSHOT, path).getAbsolutePath(); 
      Log.d(TAG, "path: " + newPath); 
    } 
  } 
}; 

private static final ContentObserver CONTENT_OBSERVER = new ContentObserver(HANDLER) { 
  @Override 
  public void onChange(boolean selfChange, Uri uri) { 
    //记得先检查读文件的权限 
    ContentResolver resolver = GeneralInfoHelper.getContext().getContentResolver(); 
    if (uri.toString().matches(MediaStore.Images.Media.EXTERNAL_CONTENT_URI + "(/\\d+)?")) { 
      Cursor cursor = resolver.query(uri, PROJECTION, null, null, MediaStore.MediaColumns.DATE_ADDED + " DESC"); 
      if (cursor != null && cursor.moveToFirst()) { 
        //完整路径 
        String newPath = cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.DATA)); 
        File file = new File(newPath); 
        //file.exists() 判断文件是否存在 
      } 
      if (cursor != null) { 
        cursor.close(); 
      } 
    } 
  } 
}; 
 
getContentResolver().registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, CONTENT_OBSERVER); 

private static String sScreenshotPath; 

//仅靠文件名而不是全路径判断是否为同一个截图文件，因为有些系统对截图有move操作 
private static boolean isSameFile(String newPath) { 
  if (TextUtils.isEmpty(sScreenshotPath)) { 
    return false; 
  } 
 
  return TextUtils.equals(removePrefixDot(new File(sScreenshotPath).getName()), removePrefixDot(new File(newPath).getName())); 
} 
 
private static String removePrefixDot(@NonNull String filename) { 
  if (filename.startsWith(".")) { 
    return filename.substring(1); 
  } 
  return filename; 
}