解析：一次检索来自不同表的所有数据

Question

我正在尝试使用不同表中的所有数据，因此我尝试使用此方法。但是，我理解for循环是同步的，因此循环在解析数据时不会停止。有没有人知道如何解决它？是否有任何解析方法或某些意图服务可以帮助解决这种情况？

private void getAllInformation(){
    String controlName;
    for(int i=0; i<3;i++){
        if(i==0){
            controlName = AppConfiguration.strEvent;
        }
        else if(i==1){
            controlName = AppConfiguration.strStore;
        }
        else if (i==2){
            controlName = AppConfiguration.strPromotion;
        }
        else{
            return;
        }

        ParseQuery<ParseObject> query = ParseQuery.getQuery(controlName);
        query.findInBackground(new FindCallback<ParseObject>() {
            public void done(List<ParseObject> objectList, ParseException e) {
                if(e!=null){
                    Toast.makeText(getApplicationContext(),"Error Loading.Please Try Again",Toast.LENGTH_LONG ).show();
                    return;
                }
                if (objectList!= null) {
                    Toast.makeText(getApplicationContext(),"Success",Toast.LENGTH_LONG ).show();
                    ParseObject.pinAllInBackground(objectList);
                }
                else{
                    Toast.makeText(getApplicationContext(),"Some Data is null!",Toast.LENGTH_LONG ).show();
                }


            }

        });

     }


//        getAllOfflineInformation();
}

Answer 1

你可以使用锁：

Object lock = new Object();

ParseQuery<ParseObject> query = ParseQuery.getQuery(controlName);
        query.findInBackground(new FindCallback<ParseObject>() {
            public void done(List<ParseObject> objectList, ParseException e) {
  synchronized (lock) {
            lock.notifyAll();
        }
                if(e!=null){
                    Toast.makeText(getApplicationContext(),"Error Loading.Please Try Again",Toast.LENGTH_LONG ).show();
                    return;
                }
                if (objectList!= null) {
                    Toast.makeText(getApplicationContext(),"Success",Toast.LENGTH_LONG ).show();
                    ParseObject.pinAllInBackground(objectList);
                }
                else{
                    Toast.makeText(getApplicationContext(),"Some Data is null!",Toast.LENGTH_LONG ).show();
                }


            }

        });

 synchronized (lock) {
    lock.wait();
}