android apk在线升级

[{"appname":"myapp","apkname":"myapp.apk","verName":1.0,"verCode":1}]

android:versionCode="1"
android:versionName="1.0"

//比较服务器版本//在 onCreate函数中调用
if (getServerVerCode()) {
    int vercode = Config.getVerCode(this);
    if (newVerCode > vercode) {
        doNewVersionUpdate();//发现新版本更新
    } else {
        Toast.makeText(getApplicationContext(),"目前是最新版本，感谢您的支持",Toast.LENGTH_LONG).show();//没有新版本
    }
}//子函数，获取版本号
 
private boolean getServerVerCode() {
    try {
        //取得服务器地址和接口文件名
        String verjson = NetworkTool.getContent(Config.UPDATE_SERVER
                + Config.UPDATE_VERJSON);
        JSONArray array = new JSONArray(verjson);
        if (array.length() > 0) {
            JSONObject obj = array.getJSONObject(0);
            try {
                newVerCode = Integer.parseInt(obj.getString("verCode"));
                newVerName = obj.getString("verName");
            } catch (Exception e) {
                newVerCode = -1;
                newVerName = "";
                return false;
            }
        }
    } catch (Exception e) {
        Log.e(TAG, e.getMessage());
        return false;
    }
    return true;
}
 
 
 
//子函数，若是有新版本，则
 
private void doNewVersionUpdate() {
    int verCode = Config.getVerCode(this);
    String verName = Config.getVerName(this);
    StringBuffer sb = new StringBuffer();
    sb.append("当前版本:");
    sb.append(verName);
    sb.append(" Code:");
    sb.append(verCode);
    sb.append(", 发现新版本");
    sb.append(newVerName);
    sb.append(" Code:");
    sb.append(newVerCode);
    sb.append(",是否更新?");
    Dialog dialog = new AlertDialog.Builder(UpdateActivity.this)
            .setTitle("软件更新")
            .setMessage(sb.toString())
            // 设置内容
            .setPositiveButton("更新",// 设置确定按钮
                    new DialogInterface.OnClickListener() { 
 
                        @Override
                        public void onClick(DialogInterface dialog,
                                int which) {
                            pBar = new ProgressDialog(UpdateActivity.this);
                            pBar.setTitle("正在下载");
                            pBar.setMessage("请稍候...");
                            pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
                            downFile(Config.UPDATE_SERVER
                                    + Config.UPDATE_APKNAME);
                        } 
 
                    })
            .setNegativeButton("暂不更新",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,
                                int whichButton) {
                            // 点击"取消"按钮之后退出程序
                            finish();
                        }
                    }).create();//创建
    // 显示对话框        
    dialog.show();
}

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void downFile(final String url) {
    pBar.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(),
                            Config.UPDATE_SAVENAME);
                    fileOutputStream = new FileOutputStream(file);
 
                    byte[] buf = new byte[1024];
                    int ch = -1;
                    int count = 0;
                    while ((ch = is.read(buf)) != -1) {
                        fileOutputStream.write(buf, 0, ch);
                        count += ch;
                        if (length > 0) {
                        }
                    }
 
                }
                fileOutputStream.flush();
                if (fileOutputStream != null) {
                    fileOutputStream.close();
                }
                down();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
 
    }.start();
 
}
 
void down() {
    handler.post(new Runnable() {
        public void run() {
            pBar.cancel();
            update();
        }
    });
 
}
 
void update() {
 
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(Uri.fromFile(new File(Environment
            .getExternalStorageDirectory(), Config.UPDATE_SAVENAME)),
            "application/vnd.android.package-archive");
    startActivity(intent);
}