成功完成doinbackground后，不会调用onPostExecute

Question

我多次使用过Async Task但我第一次面对这类问题。我搜索了Stack Overflow但找不到任何有用的解决方案。

我的问题是onPostExecute未在异步任务中调用，doinbackground中的所有操作都已完成，但控件未到达onPostExecute ...无法理解原因。

代码：

public class deletedaily extends AsyncTask<Void , Void, long[]>{

    ProgressDialog pd;
    long resultdelete;
    protected void onPreExecute(){

        pd=new ProgressDialog(StockDetail.this);
        if(pd!=null){

            pd.setMessage("Deleting data.....please wait");
            pd.show();
        }
    }

    protected long[] doInBackground(Void... params) {

        // TODO Auto-generated method stub
        try{

            Database.getInstance(getApplicationContext()).getWritableDatabase().beginTransaction();
            resultdelete = Database.getInstance(getApplicationContext()).getWritableDatabase().delete(st.tablename, st.column2 + "=? AND " + st.column3 + "=?", new String[] {getdailydate.toString(),stockname} );
            Database.getInstance(getApplicationContext()).getWritableDatabase().setTransactionSuccessful();

            new popdailydata().execute(); //here calling list view to populate after deletion
        }
        catch(Exception dailydeleteerror){}
        finally{
                Database.getInstance(getApplicationContext()).getWritableDatabase().endTransaction();
        }
        return new long[] {resultdelete};
    }   

    protected void onPostExecute(long result){

        System.out.println("postexecute entered");
        if(pd!=null){

            pd.dismiss();
        }

        if(result!=-1){

            Toast.makeText(getApplicationContext(),"Date deleted from your portfolio", Toast.LENGTH_LONG).show();
        }
        else{

            Toast.makeText(getApplicationContext(),"Failed to delete ....try again", Toast.LENGTH_LONG).show();
        }
    }
}

修改

我从图像按钮的onclick上打电话

deletedailydata.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub

                    new deletedaily().execute();
                }
            });

Answer 1

应为onPostExecute(long [] result)。

您将课程扩展为AsyncTask<Void , Void, long[]>。这意味着doInBackground的返回值为long[]，onPostExecute的参数也为。{1}}。你在onPostExecute中获得的是doInBackgroud返回的结果，类型应该是相同的。