小编use*_*807的帖子

我正在尝试创建从我的表中检索最大ID的方法,但我有问题.

这是我的方法.它工作正常,但返回值为0,

public int getLastId() {
    openDB();
    int id = 0;
    final String MY_QUERY = "SELECT MAX(_id) AS _id FROM organize";
    Cursor mCursor = mDb.rawQuery(MY_QUERY, null);  
    try {
          if (mCursor.getCount() > 0) {
            mCursor.moveToFirst();
            id = mCursor.getInt(mCursor.getColumnIndex(MY_QUERY));
          }
        } catch (Exception e) {
          System.out.println(e.getMessage());
        } finally {
            closeDB();
        }
return id;

}

我能解决这个问题,非常感谢

我在AlarmManager中询问了cancel()

当我设置闹钟时,我使用AlarmManger,这是我的代码

        StringBuilder q = new StringBuilder()
        .append(time).append(".")
        .append(day);
        String action = q.toString();

        Intent AlarmIntent = new Intent(Edit_Contract.this, ReceiverContract.class);
        AlarmIntent.setAction(action);
        AlarmManager AlmMgr = (AlarmManager)getSystemService(ALARM_SERVICE);

        PendingIntent Sender = PendingIntent.getBroadcast(Edit_Contract.this, 0, AlarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);

然后,我想取消我设置的所有闹钟,我该怎么办