android自动更新软件版本

根据网上的然后小改
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;

public class UpdateManager {
private Context mContext;
private final String updateMsg = "亲，有新版本，要更新吗！"; //下载消息提示
private Dialog noticeDialog; //下载提示对话框
private Dialog downloadDialog; //下载进度对话框
private ProgressBar mProgressBar; //进度条
private Boolean interceptFlag = false; //标记用户是否在下载过程中取消下载
private Thread downloadApkThread = null; //下载线程
private final String apkUrl = "http://www.xxx/xxx.apk"; //apk的URL地址
private final String savePath = "/sdcard/UpdateDemo/"; //下载的apk存放的路径
private final String saveFileName = savePath + "xxx.apk"; //下载的apk文件
private int progress = 0; //下载进度
private final int DOWNLOAD_ING = 1; //标记正在下载
private final int DOWNLOAD_OVER = 2; //标记下载完成
private final String TAG="版本更新";
//日志打印标签
private Handler mhandler = new Handler() { //更新UI的handler

@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case DOWNLOAD_ING:
// 更新进度条
mProgressBar.setProgress(progress);
break;
case DOWNLOAD_OVER:
downloadDialog.dismiss();
installApk();
//安装
break;
default:
break;
}
}

};

/*
* 构造方法
*/
public UpdateManager(Context context) {
this.mContext = context;
}

/*
* 检查是否有需要更新，具体比较版本xml
*/
public void checkUpdate() {
// 到服务器检查软件是否有新版本
//如果有则
showNoticeDialog();
}

/*
* 显示版本更新对话框
*/
private void showNoticeDialog() {
AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle("版本更新");
builder.setMessage(updateMsg);
builder.setPositiveButton("更新", new OnClickListener() {

public void onClick(DialogInterface dialog, int which) {
noticeDialog.dismiss();
showDownloadDialog();
}
});
builder.setNegativeButton("以后再说", new OnClickListener() {

public void onClick(DialogInterface dialog, int which) {
noticeDialog.dismiss();
}
});
noticeDialog = builder.create();
noticeDialog.show();

}

/*
* 弹出下载进度对话框
*/
private void showDownloadDialog() {
AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle("软件更新");
final LayoutInflater inflater = LayoutInflater.from(mContext);
View v = inflater.inflate(R.layout.progress, null);
mProgressBar = (ProgressBar) v.findViewById(R.id.updateProgress);
builder.setView(v);
builder.setNegativeButton("取消", new OnClickListener() {

public void onClick(DialogInterface dialog, int which) {
downloadDialog.dismiss();
interceptFlag = true;
}
});
downloadDialog = builder.create();
downloadDialog.show();
downloadLatestVersionApk();

}

/*
* 下载最新的apk文件
*/
private void downloadLatestVersionApk() {
downloadApkThread = new Thread(downloadApkRunnable);
downloadApkThread.start();
}

//匿名内部类，apk文件下载线程
private Runnable downloadApkRunnable = new Runnable() {

public void run() {
try {
URL url = new URL(apkUrl);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setConnectTimeout(5*1000);
conn.connect();
int length = conn.getContentLength();
Log.e(TAG, "总字节数:"+length);
InputStream is = conn.getInputStream();
File file = new File(savePath);
if (!file.exists()) {
file.mkdir();
}
File apkFile = new File(saveFileName);
FileOutputStream out = new FileOutputStream(apkFile);
int count = 0;
int readnum = 0;
byte[] buffer = new byte[1024];
do {
readnum = is.read(buffer);
count += readnum;
progress = (int) (((float) count / length) * 100);
Log.e(TAG, "下载进度"+progress);
mhandler.sendEmptyMessage(DOWNLOAD_ING);
if (readnum <= 0) {
// 下载结束
mhandler.sendEmptyMessage(DOWNLOAD_OVER);
break;
}
out.write(buffer,0,readnum);
} while (!interceptFlag);
is.close();
out.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}
};
/*
* 安装下载的apk文件
*/
private void installApk() {
File file= new File(saveFileName);
if(!file.exists()){
return;
}
Intent intent= new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://"+file.toString()), "application/vnd.android.package-archive");
mContext.startActivity(intent);
}
}

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