Question

我的应用在活动中包含ListView和BroadcastReciever。我希望Broadcastreciever在触发时ListView刷新listview。我的接收器将内容放入sqlite数据库，我的lv=(ListView) findViewById(R.id.conversation); lv.setSelection(lv.getCount()-1); lv.setAdapter(new mAdapter(this, srsList, messagesList, timesList, numbersList, idList)); registerForContextMenu(lv);显示该数据库的内容。

使用ListView的活动：

SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
//values.put(Messages.KEY_ID, i1);
values.put(Messages.KEY_sr, "r");
values.put(Messages.KEY_message, message);
values.put(Messages.KEY_time, datetime);
values.put(Messages.KEY_number, sen);
// Inserting Row
long student_Id = db.insert(Messages.TABLE, null, values);
db.close(); // Closing database connection

BroadcastReciever：

   for bookerName,bookingId in zip(bookerNames,bookingIds):
        Person.update_one({'Name': bookerName}, {'$push': {'Bookings': bookingId}})

Answer 1

您可以在活动中创建一个BroadcastReciever，它包含适配器并通知应该刷新适配器：

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {

        // Extract data included in the Intent
        // String message = intent.getStringExtra("message");

        if (mAdapter!= null) {
            mAdapter.notifyDataSetChanged();
        }
    }
};

在onResume中重新启动此BroadcastReciever：

this.registerReceiver(mMessageReceiver, new IntentFilter("some_unique_name"));

和unregiester onPause：

this.unregisterReceiver(mMessageReceiver);

在您的BroadcastReciever中使用：

private void updateYourActivity(Context context) {

    Intent intent = new Intent("some_unique_name");

    // put whatever data you want to send, if any
    // intent.putExtra("message", message);

    // send broadcast
    context.sendBroadcast(intent);
}

来自broadcastreciever的android刷新列表视图

1 个答案: