Android软件更新的问题

正在做一款软件，要求是检测到有更新之后自动下载并且安装，不弹出安装界面，网上找了好多都不能实现。求解
PS：不是流氓软件，类似于银行叫号机的软件

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 org.json.JSONObject;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.graphics.AvoidXfermode.Mode;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.golfor.api.RequstClient;
import com.golfor.api.UIHelper;
import com.golfor.app.AppContext;
import com.golfor.constants.Iconstants;
import com.golfor.http.AsyncHttpResponseHandler;
import com.golfor.ui.common.DownloadDialog;
import com.golfor.ui.common.DownloadDialog.MyCancelClickListener;
import com.golfor.ui.common.UpdateConfirmDialog;
import com.golfor.ui.common.UpdateConfirmDialog.DialogClickListener;

/**

• @author coolszy
• @date 2012-4-26
• @blog http://blog.92coding.com */

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;
private String mAppName;
private String versionName;
/ 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 TextView tv_pro;
/*用来保存版本号*/
private SharedPreferences mSaveVersionCode,mSaveName;
private Editor mEt,mSn;

private DownloadDialog downloadProgress;
private final String tag = "_TEST";
private DownloadDialog mDialog;
//上一个版本名
String beforName = "1.0";
private Handler mHandler = new Handler() {
    public void handleMessage(Message msg) {
        switch (msg.what) {
        // 正在下载
        case DOWNLOAD:
            String pro = msg.obj.toString();
            tv_pro.setText("正在下载（" + pro + "）");
            // 设置进度条位置
            mProgress.setProgress(progress);
            break;
        case DOWNLOAD_FINISH:
            // 安装文件
            installApk();
            break;
        default:
            break;
        }
    };
};

private String downUrl;

// public UpdateManager(Context context, String appName, String downUrl) {
// this.mContext = context;
// mAppName = appName;
// this.downUrl = downUrl;
// }
public UpdateManager(Context context) {
this.mContext = context;
}
/**
* 从服务器上获取版本信息
/
public void getVersionDataFromWeb(final String str){
RequstClient.getVersionCode(new AsyncHttpResponseHandler(){
@Override
public void onFailure(Throwable error, String content) {
// TODO Auto-generated method stub
super.onFailure(error, content);
UIHelper.cloesLoadDialog();
}
@Override
public void onSuccess(int statusCode, String content) {
// TODO Auto-generated method stub
super.onSuccess(statusCode, content);
UIHelper.cloesLoadDialog();
Log.e("TEST", " 从服务器上获取版本信息");
try {
JSONObject obj = new JSONObject(content);
JSONObject data = obj.getJSONObject("data");
String apkUrl = data.getString("apkPath");
String serviceVersion = data.getString("apkVersion");
String apkMessage = data.getString("apkMessage");
String apkName = data.getString("apkName");
versionName = data.getString("apkVersionName");
AppContext.getInstance().setAppVersion(versionName);
mAppName = apkName;
Log.e(tag, apkUrl+">>>"+apkMessage+"//"+Integer.parseInt(serviceVersion)+"/"+apkName+"/"+versionName);
downUrl = apkUrl;
checkUpdate(versionName,apkMessage,str);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
UIHelper.cloesLoadDialog();
}
}
});
}
/*
* 检测软件更新
/
public void checkUpdate(String versionName, String content,String flag) {
if (isUpdate(versionName)) {
// 显示提示对话框
showNoticeDialog(content);
} else{
if(flag.equals(Iconstants.MINE_FRAGMENT)){
UIHelper.showToasts("处于最新版本");
}
return ;
}
}
/*
* 检查软件是否有更新版本
* @return
/
private boolean isUpdate(String versionName) {
mSaveVersionCode = mContext.getSharedPreferences("version", mContext.MODE_PRIVATE);
mSaveName = mContext.getSharedPreferences("beforename", mContext.MODE_PRIVATE);
mEt = mSaveVersionCode.edit();
mSn = mSaveName.edit();
beforName = mSaveName.getString("beforename", "1.0");
// 获取当前软件版本
String currentVersionName = getVersionCode(mContext,beforName);
Log.e(tag, "当前软件版本:"+currentVersionName+""+"下载的版本："+versionName);
if (versionName.equals(currentVersionName)) {
// mEt.putInt("versionCode", serviceCode);
return false;
}else{
return true;
}
}
/*
* 获取软件版本号
*
* @param context
* @return
*/
public String getVersionCode(Context context,String beforeName) {
String version = mSaveVersionCode.getString("versionName",null);
if(version == null){
// String pkg = context.getPackageName();
// 获取软件版本号，对应AndroidManifest.xml下android:versionCode
PackageManager manager = context.getPackageManager();
PackageInfo info;
try {
info = manager.getPackageInfo(context.getPackageName(), 0);
version = info.versionName;
Log.e(tag, "上一个版本版本:"+beforeName+""+"保存的版本："+version);
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else{
//更新后的版本号
version = mSaveVersionCode.getString("versionName", null);
mSn.putString("name", version);
mSn.commit();
Log.e(tag, "更新后保存的版本:"+beforName);
}
return version;
}

/**
 * 显示软件更新对话框
 */
public void showNoticeDialog(String content) {
    // 构造对话框
    UpdateConfirmDialog dialog = new UpdateConfirmDialog(mContext);
    dialog.setCustomTitle("发现新版本");
    dialog.setUpdateContent(content);
    dialog.setConfirm("立即下载");
    dialog.setCancel("稍后更新");
    dialog.setCanceledOnTouchOutside(false);
    dialog.setClickListener(new DialogClickListener() {
        @Override
        public void onConfirmClickListener() {
            mEt.putString("versionName", versionName);
            mEt.commit();
            // 显示下载对话框
            showDownloadDialog();
        }

        @Override
        public void onCancelClickListener() {

        }
    });
    dialog.show();
}

/**
 * 显示软件下载对话框
 */
private void showDownloadDialog() {
    // 构造软件下载对话框
    mDialog = new DownloadDialog(mContext);
    mDialog.setTitle("下载更新");
    mProgress = mDialog.getProgressBar();
    tv_pro = mDialog.getMessage();
    //取消

// dialog.setMyClickListener(new MyCancelClickListener() {
// public void onCancelClickListener() {
// cancelUpdate = true;
// }
// });
mDialog.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(downUrl);
                // 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, mAppName);
                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);
                    Message msg = new Message();
                    msg.obj = progress + "%";
                    msg.what = DOWNLOAD;
                    // 更新进度
                    mHandler.sendMessage(msg);
                    if (numread <= 0) {
                        // 下载完成
                        mDialog.cancel();
                        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
        if (downloadProgress != null ) {
            downloadProgress.dismiss();
        }
    }
};

/**
 * 安装APK文件
 */
private void installApk() {
    File apkfile = new File(mSavePath, mAppName);
    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);
}
/**
 * 
 */

}

http://www.php100.com/html/it/biancheng/2015/0319/8815.html

不弹出安装界面，静默安装吗