Android 版本自动更新

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);
}
}