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