apk在线升级

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 com.google.gson.Gson;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;
import com.szy.update.untity.VerEntity;




import android.app.AlertDialog;
import android.app.Dialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;




import android.content.DialogInterface.OnClickListener;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;




/**
 *@author coolszy
 *@date 2012-4-26
 *@blog http://blog.92coding.com
 *此页面为逻辑实现页面，需Activity中调用checkUpdate()方法为此类逻辑入口
 */




public class UpdateManager
{
    /* 下载中 */
    private static final int DOWNLOAD = 1;
    /* 下载结束 */
    private static final int DOWNLOAD_FINISH = 2;
    /* 下载保存路径 */
    private String mSavePath;
    /* 记录进度条数量 */
    private int progress;
    /* 是否取消更新 */
    private boolean cancelUpdate = false;
    private Context mContext;
    /* 更新进度条 */
    private ProgressBar mProgress;
    private Dialog mDownloadDialog;
    private Handler mHandler = new Handler()
    {
        public void handleMessage(Message msg)
        {
            switch (msg.what)
            {
                // 正在下载
                case DOWNLOAD:
                    // 设置进度条位置
                    mProgress.setProgress(progress);
                    break;
                case DOWNLOAD_FINISH:
                    // 安装文件
                    installApk();
                    break;
                default:
                    break;
            }
        };
    };




    public UpdateManager(Context context)
    {
        this.mContext = context;
    }




    /**
     * 检测软件更新，
     */
    public void checkUpdate()
    {
        if (isUpdate())
        {
            // 显示提示对话框
            showNoticeDialog();
        } else
        {
            Toast.makeText(mContext, "已经是最新版本", Toast.LENGTH_LONG).show();
        }
    }




    /**
     * 检查软件是否有更新版本
     *
     * @return
     */
    private boolean isUpdate(){




        String url = "http://172.16.16.21:8080/postTest/index.jsp";//服务端地址
        HttpUtils httpUtils=new HttpUtils();
        httpUtils.send(HttpMethod.POST,url, null, new RequestCallBack() {




            @Override
            public void onFailure(HttpException arg0, String arg1) {
                Toast.makeText(mContext, "服务器请求失败，发生未知异常错误", 1).show();
            }
            @Override
            public void onSuccess(ResponseInfo arg0) {
                String jsonData = arg0.result+"";
                //解析服务端返回数据，这里用户可自行设置，我这里返回的是json
                Gson gson = new Gson();
                VerEntity en = gson.fromJson(jsonData, VerEntity.class);


                MyApp.setCode( en.getVersion());
                MyApp.setUrl(en.getUrl());
                MyApp.setName(en.getName());
            }
        });
        // 获取当前软件版本
        int versionCode = getVersionCode(mContext);
      /*
       * MyApp.code为服务端apk文件版本，此处也可写为不等于
       */
        if (MyApp.getCode() <= versionCode)
        {
            return false;
        }else {
            return true;
        }


    }




    /**
     * 获取软件版本号
     *
     * @param context
     * @return
     */
    private int getVersionCode(Context context)
    {
        int versionCode = 0;
        try
        {
            // 获取软件版本号，对应AndroidManifest.xml下android:versionCode
            versionCode = context.getPackageManager().getPackageInfo("com.szy.update", 0).versionCode;
        } catch (NameNotFoundException e)
        {
            e.printStackTrace();
        }
        return versionCode;
    }




    /**
     * 显示软件更新对话框
     */
    private void showNoticeDialog()
    {
        // 构造对话框
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.soft_update_title);
        builder.setMessage(R.string.soft_update_info);
        // 更新
        builder.setPositiveButton(R.string.soft_update_updatebtn, new OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                dialog.dismiss();
                // 显示下载对话框
                showDownloadDialog();
            }
        });
        // 稍后更新
        builder.setNegativeButton(R.string.soft_update_later, new OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                dialog.dismiss();
            }
        });
        Dialog noticeDialog = builder.create();
        noticeDialog.show();
    }




    /**
     * 显示软件下载对话框
     */
    private void showDownloadDialog()
    {
        // 构造软件下载对话框
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.soft_updating);
        // 给下载对话框增加进度条
        final LayoutInflater inflater = LayoutInflater.from(mContext);
        View v = inflater.inflate(R.layout.softupdate_progress, null);
        mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
        builder.setView(v);
        // 取消更新
        builder.setNegativeButton(R.string.soft_update_cancel, new OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                dialog.dismiss();
                // 设置取消状态
                cancelUpdate = true;
            }
        });
        mDownloadDialog = builder.create();
        mDownloadDialog.show();
        // 现在文件
        downloadApk();
    }




    /**
     * 下载apk文件
     */
    private void downloadApk()
    {
        // 启动新线程下载软件
        new downloadApkThread().start();
    }




    /**
     * 下载文件线程
     *
     * @author coolszy
     *@date 2012-4-26
     *@blog http://blog.92coding.com
     */
    private class downloadApkThread extends Thread
    {
        @Override
        public void run()
        {
            try
            {
                // 判断SD卡是否存在，并且是否具有读写权限
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
                {
                    // 获得存储卡的路径
                    String sdpath = Environment.getExternalStorageDirectory() + "/";
                    mSavePath = sdpath + "download";
                    //URL url = new URL(list.get(0).getUrl());
                    URL url = new URL(MyApp.getUrl());
                    // 创建连接
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.connect();
                    // 获取文件大小
                    int length = conn.getContentLength();
                    // 创建输入流
                    InputStream is = conn.getInputStream();




                    File file = new File(mSavePath);
                    // 判断文件目录是否存在
                    if (!file.exists())
                    {
                        file.mkdir();
                    }
                    File apkFile = new File(mSavePath, MyApp.getName());
                    FileOutputStream fos = new FileOutputStream(apkFile);
                    int count = 0;
                    // 缓存
                    byte buf[] = new byte[1024];
                    // 写入到文件中
                    do
                    {
                        int numread = is.read(buf);
                        count += numread;
                        // 计算进度条位置
                        progress = (int) (((float) count / length) * 100);
                        // 更新进度
                        mHandler.sendEmptyMessage(DOWNLOAD);
                        if (numread <= 0)
                        {
                            // 下载完成
                            mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
                            break;
                        }
                        // 写入文件
                        fos.write(buf, 0, numread);
                    } while (!cancelUpdate);// 点击取消就停止下载.
                    fos.close();
                    is.close();
                }
            } catch (MalformedURLException e)
            {
                e.printStackTrace();
            } catch (IOException e)
            {
                e.printStackTrace();
            }
            // 取消下载对话框显示
            mDownloadDialog.dismiss();
        }
    };




    /**
     * 安装APK文件
     */
    private void installApk()
    {
        File apkfile = new File(mSavePath, MyApp.getName());
        if (!apkfile.exists())
        {
            return;
        }
        // 通过Intent安装APK文件
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");
        mContext.startActivity(i);
    }