publishProgress

来源：互联网发布：mac搜狗输入罗马数字编辑：程序博客网时间：2024/06/07 03:21
关于AsyncTask的publishProgress循环播放文字广告: activity_main.xml文件：<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:orientation="vertical"    app:layout_behavior="@string/appbar_scrolling_view_behavior"    tools:context="example.com.handler.MainActivity"    tools:showIn="@layout/activity_main">    <TextView        android:id="@+id/tv"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Hello World!"/>    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btn"        android:text="start"/>    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btn1"        android:text="stop"/></LinearLayout> 下面是MainActivity.java 文件package example.com.asynctaskdemo;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {    private TextView tv;    private Button btn;    private Button btn1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initListener();    }    private void initView() {        tv = (TextView) findViewById(R.id.tv);        btn = (Button) findViewById(R.id.btn);        btn1 = (Button) findViewById(R.id.btn1);    }    private class MyAsyncTask extends AsyncTask<String, Integer, Void> {        private TextView textView;        private String[] str = {"First advertisement", "Second advertisement"};        private int n = 0;        private boolean stop = false;        public MyAsyncTask(TextView textView) {            this.textView = textView;        }        public void setStop(boolean stop){            this.stop=stop;        }        @Override        protected Void doInBackground(String... params) {            Log.d("Tag","doInBackgroud");            while (!stop) {                try {                    Thread.sleep(1000);                } catch (InterruptedException e) {                    e.printStackTrace();                }                /**                 * n就是传入下面onProgressUpdate 的参数                 * publishProgress是跨线程的，                 */                publishProgress(n);                n++;                Log.i("Tag","publishProgress"+n);                Log.d("Tag", "publishProgress");            }            return null;        }        @Override        protected void onProgressUpdate(Integer... values) {            super.onProgressUpdate(values);            Log.d("Tag", "onProgressUpdate");            Log.i("Tag","n="+values[0]);            textView.setText(n+str[values[0]%2]);           // textView.setText("noThing");        }        @Override        protected void onPostExecute(Void aVoid) {            super.onPostExecute(aVoid);            textView.setText("广告结束");        }    }    private MyAsyncTask myTask;    private void initListener() {        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                myTask = new MyAsyncTask(tv);                myTask.execute();            }        });        btn1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                myTask.setStop(true);            }        });    }}
0 0