安卓异步处理的使用AsyncTask

AsyncTask处理是安卓中处理多个线程之间通讯的最主要的方法。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/progressBar1"
        android:layout_alignParentTop="true"
        android:layout_marginTop="162dp"
        android:text="" />

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="54dp" />

</RelativeLayout>

主程序如下：

package com.example.ASyncTask;

import android.os.AsyncTask;
import android.os.Bundle;
import android.R.integer;
import android.app.Activity;
import android.view.Menu;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends Activity {
	private TextView info = null;
	private ProgressBar mybar = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		super.setContentView(R.layout.activity_main);
		this.info = (TextView) super.findViewById(R.id.textView1);
		this.mybar = (ProgressBar) super.findViewById(R.id.progressBar1);
new ChildUpdate().execute(100);//创建匿名对象执行程序
	}

	private class ChildUpdate extends AsyncTask<Integer, Integer, String> {

		@Override
		protected String doInBackground(Integer... params) {// 后台处理的程序
			for (int i = 0; i < 100; i++) {
				MainActivity.this.mybar.setProgress(i);// 执行传入操作
				this.publishProgress(i);// 更新每次的那内容，把值传给onProgressupdate()进行处理
				try {
					Thread.sleep(params[0]);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			return "执行完毕";
		}

		@Override
		protected void onPostExecute(String result) {// 执行完毕后的操作
			MainActivity.this.info.setText(result);
		}

		@Override
		protected void onProgressUpdate(Integer... values) {
			MainActivity.this.info.setText("当前进度为："
					+ String.valueOf(values[0]));
		}

	}

}

安卓异步处理的使用AsyncTask,,5-wow.com