数据库查询文件夹下的文件

Posted 2020-11-04 zCoderJoy

MediaProvider 操作。

1. 通过data查询出某个路径ID，然后查询其Parent未此ID的所有文件。

{
    Log.e("zcxpre","rowId = start ！！！22222222！");
    String where1 = MediaStore.Files.FileColumns._ID + ">?"+ " AND " + MediaStore.Files.FileColumns.DATA + "=?";
    String[] selectionArgs1 = null;
    selectionArgs1 = new String[] { "1","/storage/emulated/0/test" };
    try {
        Log.e("zcxpre","rowId = start ！！！！");
        c = mProvider.query(limitUri, FILES_PRESCAN_PROJECTION,
                where1, selectionArgs1, MediaStore.Files.FileColumns._ID, null);
        if (c == null) {
            Log.e("zcxpre","c == null) ");
            return;
        }

        int num = c.getCount();

        if (num == 0) {
            Log.e("zcxpre","num == 0");
            return;
        }
        long rowId = -1;
        while (c.moveToNext()) {

            rowId = c.getLong(0);
        }

        Log.e("zcxpre","rowId = "+rowId);
    } catch (Exception e) {

        Log.e("zcxpre","rowId = Exectpoiton e "+e);
    }
}

2.直接使用like查询所有文件。

String where1 = MediaStore.Files.FileColumns._ID + ">?"+ " AND " + MediaStore.Files.FileColumns.DATA + " like ?";
String[] selectionArgs1 = null;
selectionArgs1 = new String[] { "1","/storage/emulated/0/tencent%" };