我使用下面的代码来获取图像文件路径和它的缩略图。
String[] projection = {MediaStore.Images.Media._ID, MediaStore.Images.Media.DATA, MediaStore.Images.ImageColumns.DATA};
Cursor cursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, null, null, MediaStore.Images.Media._ID);
int count = cursor.getCount();
int image_column_index = cursor.getColumnIndex(MediaStore.Images.Media._ID);
int image_path_index = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
int i;
for(i = 0; i < count; i++) {
cursor.moveToPosition(i);
int id = cursor.getInt(image_column_index);
String p = cursor.getString(image_path_index);
Bitmap b = MediaStore.Images.Thumbnails.getThumbnail(getApplicationContext().getContentResolver(), id, MediaStore.Images.Thumbnails.MICRO_KIND, null);
}
在文件修改后,我使用下面的代码来刷新数据库。
Intent scanIntent = new Intent(Intent.ACTION_MEDIA_MOUNTED);
scanIntent.setData(Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath())));
sendBroadcast(scanIntent);
但是文件数量越多,花费时间越多。如何确认文件已经修改好了呢?