Android 版本自动更新

截图如下：

代码实现如下：

package com.update.apk;

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

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    String newVerName = "";//新版本名称
    int newVerCode = -1;//新版本号
    ProgressDialog pd = null;
    String UPDATE_SERVERAPK = "ApkUpdateAndroid.apk";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        if(getServerVer()){
            int verCode = this.getVerCode(this);
            if(newVerCode>verCode){
                doNewVersionUpdate();//更新版本
            }else{
                notNewVersionUpdate();//提示已是最新版本
            }
        }
    }

    /**
     * 获得版本号
     */
    public int getVerCode(Context context){
        int verCode = -1;
        try {
            verCode = context.getPackageManager().getPackageInfo("com.update.apk", 0).versionCode;
        } catch (NameNotFoundException e) {
            // TODO Auto-generated catch block
            Log.e("版本号获取异常", e.getMessage());
        }
        return verCode;
    }

    /**
     * 获得版本名称
     */
    public String getVerName(Context context){
        String verName = "";
        try {
            verName = context.getPackageManager().getPackageInfo("com.update.apk", 0).versionName;
        } catch (NameNotFoundException e) {
            Log.e("版本名称获取异常", e.getMessage());
        }
        return verName;
    }

    /**
     * 从服务器端获得版本号与版本名称
     * @return
     */
    public boolean getServerVer(){
        try {
            URL url = new URL("http://10.0.2.2:8080/ApkUpdateService/ver");
            HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
            httpConnection.setDoInput(true);
            httpConnection.setDoOutput(true);
            httpConnection.setRequestMethod("GET");
            httpConnection.connect();
            InputStreamReader reader = new InputStreamReader(httpConnection.getInputStream());
            BufferedReader bReader = new BufferedReader(reader);
            String json = bReader.readLine();
            JSONArray array = new JSONArray(json);
            JSONObject jsonObj = array.getJSONObject(0);
            newVerCode = Integer.parseInt(jsonObj.getString("verCode"));
            newVerName = jsonObj.getString("verName");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 不更新版本
     */
    public void notNewVersionUpdate(){
        int verCode = this.getVerCode(this);
        String verName = this.getVerName(this);
        StringBuffer sb = new StringBuffer();
        sb.append("当前版本：");
        sb.append(verName);
        sb.append(" Code:");
        sb.append(verCode);
        sb.append("\n已是最新版本，无需更新");
        Dialog dialog = new AlertDialog.Builder(this)
        .setTitle("软件更新")
        .setMessage(sb.toString())
        .setPositiveButton("确定", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                finish();
            }
        }).create();
        dialog.show();
    }

    /**
     * 更新版本
     */
    public void doNewVersionUpdate(){
        int verCode = this.getVerCode(this);
        String verName = this.getVerName(this);
        StringBuffer sb = new StringBuffer();
        sb.append("当前版本：");
        sb.append(verName);
        sb.append(" Code:");
        sb.append(verCode);
        sb.append(",发现版本：");
        sb.append(newVerName);
        sb.append(" Code:");
        sb.append(verCode);
        sb.append(",是否更新");
        Dialog dialog = new AlertDialog.Builder(this)
        .setTitle("软件更新")
        .setMessage(sb.toString())
        .setPositiveButton("更新", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                pd = new ProgressDialog(MainActivity.this);
                pd.setTitle("正在下载");
                pd.setMessage("请稍后。。。");
                pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);
                downFile("http://10.0.2.2:8080/ApkUpdateService/ApkUpdateAndroid.apk");
            }
        })
        .setNegativeButton("暂不更新", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                finish();
            }
        }).create();
        //显示更新框
        dialog.show();
    }

    /**
     * 下载apk
     */
    public void downFile(final String url){
        pd.show();
        new Thread(){
            public void run(){
                HttpClient client = new DefaultHttpClient();
                HttpGet get = new HttpGet(url);
                HttpResponse response;
                try {
                    response = client.execute(get);
                    HttpEntity entity = response.getEntity();
                    long length = entity.getContentLength();
                    InputStream is =  entity.getContent();
                    FileOutputStream fileOutputStream = null;
                    if(is != null){
                        File file = new File(Environment.getExternalStorageDirectory(),UPDATE_SERVERAPK);
                        fileOutputStream = new FileOutputStream(file);
                        byte[] b = new byte[1024];
                        int charb = -1;
                        int count = 0;
                        while((charb = is.read(b))!=-1){
                            fileOutputStream.write(b, 0, charb);
                            count += charb;
                        }
                    }
                    fileOutputStream.flush();
                    if(fileOutputStream!=null){
                        fileOutputStream.close();
                    }
                    down();
                }  catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }.start();
    }

    Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {

            super.handleMessage(msg);
            pd.cancel();
            update();
        }
    };

    /**
     * 下载完成，通过handler将下载对话框取消
     */
    public void down(){
        new Thread(){
            public void run(){
                Message message = handler.obtainMessage();
                handler.sendMessage(message);
            }
        }.start();
    }

    /**
     * 安装应用
     */
    public void update(){
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory(),UPDATE_SERVERAPK))
                , "application/vnd.android.package-archive");
        startActivity(intent);
    }
}  

from：http://www.cnblogs.com/shmily0703/archive/2012/04/19/shmily_apk_update.html