Question

我的异步任务调用在我的活动的onCreate（）方法中

my_random_task = new MyRandomTask();
my_random_task.setListener(this);

final Button post_btn = (Button) findViewById(R.id.post_btn);
post_btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        EditText post_text = (EditText) findViewById(R.id.post_text);

        if (!post_text.isEmpty()) {
            summoner_search_task.execute(summoner_name);
        }else{
            Toast.makeText(getApplicationContext(), "Please type a post text.", Toast.LENGTH_SHORT).show();
            post_text.requestFocus();
        }

    }
});

asynctask是空的，但当我尝试按下按钮时再次调用asynctask

java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)

有没有办法让asynctask重置并在按下按钮后再次运行？

Answer 1

我正在传递一个CallBackListener接口，该接口包含一个回调函数，该函数在异步任务结束时触发。

所以我所做的（感谢@TronicZomB和@stkent）是：

final CallBackListener cbl = this;

final Button post_btn = (Button) findViewById(R.id.post_btn);
post_btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        EditText post_text = (EditText) findViewById(R.id.post_text);

        if (!post_text.isEmpty()) {
            my_random_task = new MyRandomTask();
            my_random_task.setListener(cbl);
            summoner_search_task.execute(summoner_name);
        }else{
            Toast.makeText(getApplicationContext(), "Please type a post text.", Toast.LENGTH_SHORT).show();
            post_text.requestFocus();
        }

    }
});

Android - 无法执行任务：任务已执行

1 个答案: