将runOnUiThread转换为AsyncTask [英] Converting runOnUiThread to AsyncTask

问题描述

我阅读了一些将runOnUiThread转换为AsyncTask所需的链接: Android:RunOnUiThread与AsyncTask

I read in some links that i need to convert my runOnUiThread to AsyncTask: Android: RunOnUiThread vs AsyncTask

但是我无法完成它.我正在实现一个AutoCompleteText，它可以从数据库进行查询.

But I am unable to get it done. I am implementing an AutoCompleteText which takes query from a database.

我的runOnUiThread以及新线程(它会编译):

My runOnUiThread along with the new thread (it compiles):

new Thread(new Runnable() {
        public void run() {
            final DataBaseHelper dbHelper = new DataBaseHelper(ActivityName.this);
            dbHelper.openDataBase();
            item_list = dbHelper.getAllItemNames();

            ActivityName.this.runOnUiThread(new Runnable() {

                public void run() {
                    ArrayAdapter<String> sAdapter = new ArrayAdapter<String>(
                            ActivityName.this,
                            android.R.layout.simple_dropdown_item_1line,
                            item_list);
                    itemNameAct = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView_item_name);
                    itemNameAct.setAdapter(sAdapter);

                }
            });

        }
    }).start();

我将工作线程部分放在doInBackground中，将代码的runOnUiThread部分放在onPostExecute中，但是它在启动时崩溃.

I put the worker thread part in doInBackground and the runOnUiThread part of code in onPostExecute but it crashes on launch.

推荐答案

这很尴尬.我问了一个问题，并亲自回答了这个问题:/ 其实我在尝试AsyncTask(Object，Void，Cursor)，但对我没有任何好处.

This is awkward. I asked a question and am answering it myself :/ Actually I was trying AsyncTask(Object, Void, Cursor) and it was not doing me any good.

这是正在上课的班级

class autoComplete extends AsyncTask<Void, Void, Void> {
    final DataBaseHelper dbHelper = new DataBaseHelper(ActivityName.this);

    @Override
    protected Void doInBackground(Void... params) {

        dbHelper.openDataBase();
        item_list = dbHelper.getAllItemNames();
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        ArrayAdapter<String> sAdapter = new ArrayAdapter<String>(
                ClassName.this, android.R.layout.simple_dropdown_item_1line,
                item_list);
        itemNameAct= (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView_item_name);
        itemNameAct.setAdapter(sAdapter);
    }

}

然后在onCreate中将其初始化为:

and then in onCreate i initialize it as:

new autoComplete().execute();

这篇关于将runOnUiThread转换为AsyncTask的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！