手机安全卫士开发系列（5）——自动更新

新建一个MainActivity

package com.meritit.mobiesafe.ui;

import com.meritit.mobiesafe.R;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.setContentView(R.layout.main);
	}
}

配置mainfest文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.meritit.mobiesafe"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <instrumentation
        android:name="android.test.InstrumentationTestRunner"
        android:targetPackage="com.meritit.mobiesafe" />
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" 
        >
        <uses-library android:name="android.test.runner" />
        <activity
            android:name=".ui.SplashActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity 
            android:name=".ui.MainActivity"
            android:label="@string/main_screen"></activity>
    </application>

</manifest>

新建一个DownLoadFileTask类用于下载文件

package com.meritit.mobiesafe.engine;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.app.ProgressDialog;

public class DownLoadFileTask {
	
	/**
	 * 
	 * @param path 服务器文件路径
	 * @param filepath 本地文件路径 
	 * @return 本地文件对象
	 * @throws Exception
	 */
	public static File getFile(String path,String filepath,ProgressDialog pd) throws Exception{
		URL url = new URL(path);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		conn.setRequestMethod("GET");
		conn.setConnectTimeout(5000);
		if(conn.getResponseCode() == 200){
			int total =  conn.getContentLength();
			pd.setMax(total);
			InputStream is = conn.getInputStream();
			File file = new File(filepath);
			FileOutputStream fos = new FileOutputStream(file);
			byte[] buffer = new byte[1024];
			int len = 0;
			int process = 0;
			while((len = is.read(buffer))!=-1){
				fos.write(buffer, 0, len);
				process +=len;
				pd.setProgress(process);
				Thread.sleep(50);
			}
			fos.flush();
			fos.close();
			is.close();
			
			return file;
		}
		return null;
	}
}

开启一个线程下载文件

	private class DownLoadFileThreadTask implements Runnable {
		private String path; // 服务器路径
		private String filepath; // 本地文件路径

		public DownLoadFileThreadTask(String path, String filepath) {
			this.path = path;
			this.filepath = filepath;
		}

		public void run() {
			try {
				File file = DownLoadFileTask.getFile(path, filepath,pd);
				Log.i(TAG,"下载成功");
				pd.dismiss();
				install(file);
			} catch (Exception e) {
				e.printStackTrace();
				Toast.makeText(getApplicationContext(), "下载文件失败", 0).show();
				pd.dismiss();
				loadMainUI();
				
			}

		}

	}

自动安装apk文件

	/**
	 * 安装apk
	 * @param file
	 */
	private void install(File file){
		Intent intent = new Intent();
		intent.setAction(Intent.ACTION_VIEW);
		intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
		finish();
		startActivity(intent);
	}

新启一个线程用来延时两秒中（这样就可以看到闪屏界面）

		new Thread(){
			public void run() {
				super.run();
				try {
					sleep(2000);
					handler.sendEmptyMessage(0);
				} catch (InterruptedException e) {
					
					e.printStackTrace();
				}
				
			};
		}.start();

延时后通知主线程开始下面的事

	private Handler handler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			super.handleMessage(msg);
			//判读服务器的版本号和客户端的版本号是否相同 
			if(isNeedUpdate(versiontext)){
				Log.i(TAG, "弹出升级对话框");
				showUpdateDialog();
			}
		};
	};

资源下载：http://download.csdn.net/detail/lxq_xsyu/5989881