private void deleteLatestPhoto() {

　　String[] projection = new String[] { MediaStore.Images.ImageColumns._ID,

　　MediaStore.Images.ImageColumns.DATE_TAKEN };

　　Cursor cursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection,

　　null, null, MediaStore.Images.ImageColumns.DATE_TAKEN + " DESC");

　　if (cursor != null) {

　　cursor.moveToFirst();

　　ContentResolver cr = mContext.getContentResolver();

　　cr.delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,

　　BaseColumns._ID + "=" + cursor.getString(0), null);

　　}

　　}