Question

我正在将记录插入到DB中，该记录在两个字段中具有唯一的构造 - 名称和DOB。我从Async任务的DoInBackground（）方法插入。我这样做：

try{
                        insertInDb(name.trim(),start_date.trim(),imagePath.trim(), String.valueOf(TYPE),String.valueOf(SELECTION), name_friend.trim(), isAdhoc);
                    }catch (Exception e){
                        System.out.println("Caught up here"+e);
                        return "Record Exists";
                    }

这是我的postExecute（）：

public void onPostExecute(String result){
            //TODO
            if(result.equalsIgnoreCase("Record Exists")){
                if(Asycdialog !=null && Asycdialog.isShowing())
                    Asycdialog.dismiss();
                Toast.makeText(getApplicationContext(), "Record Exists please try a different name and year", Toast.LENGTH_LONG).show(); 

            }else if(result.equalsIgnoreCase("Success")){
                if(Asycdialog !=null && Asycdialog.isShowing()){
                    Asycdialog.dismiss();

                    Intent mainIntent;
                    mainIntent = new Intent(AdhocCase.this,MainActivity.class); 
                    AdhocCase.this.startActivity(mainIntent);
                    AdhocCase.this.finish(); 
                }
            }

从doInBackground返回的“Record Exists”情况下的toast消息似乎永远不会执行。然而意图确实改变了。

这是我完整的doInBackground（）：

protected String doInBackground(Void... params) {
    // TODO Auto-generated method stub

    try{
        System.out.println("Type in async: "+type);
        System.out.println("Selection in async: "+String.valueOf(SELECTION));
        System.out.println("TYPE in async: "+String.valueOf(TYPE));
        dbHelper.open(); 

        Cursor checkCur = dbHelper.checkIfRecordExists(name.trim(), start_date.trim()); 
        System.out.println("Cursor count"+checkCur.getCount()); 
        if(checkCur != null && checkCur.moveToFirst()){
            System.out.println("Exists"); 
            return "Record Exists";
        }else{
            System.out.println("Image path: "+imagePath);
            insertAdhocCase(toTitleCase(name).trim(),start_date.trim(),imagePath, type, String.valueOf(SELECTION), toTitleCase(name_friend).trim());

            try{
                insertInDb(name.trim(),start_date.trim(),imagePath.trim(), String.valueOf(TYPE),String.valueOf(SELECTION), name_friend.trim(), isAdhoc);
            }catch (Exception e){
                System.out.println("Caught up here"+e);
                return "Record Exists";
            }   
        //  LC.writeToSDCard();
        }

    }catch(Exception e){
        //  System.out.println(e); 
    }

    return "Success";
}

}

Answer 1

我认为问题在于您的

 Toast.makeText(getApplicationContext(), "Record Exists please try a different name and year", Toast.LENGTH_LONG).show();

您必须显式提供来自调用Activity的上下文，例如

Toast.makeText(context.getApplicationContext(), "Record Exists please try a different name and year", Toast.LENGTH_LONG).show();

Check this供参考。

正确的方法来终止异步任务并通知用户：

1 个答案: