Android下载更新代码

其实是昨天反编译一个apk，给它添加一个自动更新的功能用到的。为了在smali下方便查看，代码写的不规范，反正到了smali都一个吊样~~~~

权限：
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
    <uses-permission android:name="android.permission.INTERNET"/>

    //Start===========
    public void updata(){
        new Thread(){
            @Override
            public void run() {
                request(apiUrl);
            }
        }.start();

    }
    String newapkName = "updata.apk";
    String apiUrl = "http://192.168.1.101:8080/udate.txt";
    //请求接口
    public void request(String Httpurl){
        URL url = null;
        try {
            url = new URL(Httpurl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            InputStream is = conn.getInputStream();
            String s = toString(is);
            JSONObject jsonObject = new JSONObject(s);
            Double versionCode = jsonObject.getDouble("versionCode"); //远程版本
            String versionName = getVersionName();
            double v = Double.parseDouble(versionName);
            if(versionCode > v){
                //更新下载
                downLoadFile(jsonObject.getString("updateurl"));

            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what){
                case 1:
                    ShowUpdataDilg();
                    break;

            }
        }
    };
    //版本提示对话框
    public void ShowUpdataDilg() {
        new AlertDialog.Builder(MainActivity.this)
                .setTitle("提示")
                .setMessage("是否安装最新版本？ ")
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Uodate();
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {

                    }
                })
                .show();
    }

    //获取版本
    private String getVersionName() throws Exception
    {
        PackageManager packageManager = getPackageManager();
        // getPackageName()是你当前类的包名，0代表是获取版本信息
        PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(),0);
        String version = packInfo.versionName;
        return version;
    }

    //安装apk
    public void Uodate(){
//        String str = "/" + newapkName;
//        String fileName = Environment.getExternalStorageDirectory() + str;
//        Intent intent = new Intent(Intent.ACTION_VIEW);
//        intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive");
//        startActivity(intent);

        String str = "/sdcard/update/" + newapkName;
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(new File(str)),
                "application/vnd.android.package-archive");
        startActivity(intent);

    }

//对话框确定
    public void isUpdate(){
        String str = "/" + newapkName;
        String fileNames = Environment.getExternalStorageDirectory() + str;
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(new File(fileNames)), "application/vnd.android.package-archive");
        startActivity(intent);

    }

    protected File downLoadFile(String httpUrl) {
        File tmpFile = new File("/sdcard/update");
        if (!tmpFile.exists()) {
            tmpFile.mkdir();
        }
        final File file = new File("/sdcard/update/" + newapkName);

        try {
            URL url = new URL(httpUrl);
            try {
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                InputStream is = conn.getInputStream();
                FileOutputStream fos = new FileOutputStream(file);
                byte[] buf = new byte[256];
                conn.connect();
                double count = 0;
                if (conn.getResponseCode() >= 400) {
                    Toast.makeText(MainActivity.this, "连接超时", Toast.LENGTH_SHORT).show();
                } else {
                    while (count <= 100) {
                        if (is != null) {
                            int numRead = is.read(buf);
                            if (numRead <= 0) {
                                break;
                            } else {
                                fos.write(buf, 0, numRead);
                            }
                        } else {
                            break;
                        }
                    }
                }
                fos.close();
                is.close();
                conn.disconnect();
                //下载成功
                handler.sendEmptyMessage(1);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        return file;
    }
    //输入流转换为String
    public String toString(InputStream is) {
        String result = null;
        try {
            //构造一个输出流(字节队列输出流)
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            //一个byte数组，用来存储得到的字节数据
            byte[] bys = new byte[1024];
            int len = 0;
            //循环读出完整字节数据
            while((len = is.read(bys)) != -1) {
                baos.write(bys,0,len);
            }
            //byte数据转换为字符串
            result = new String(baos.toByteArray());
            is.close();
            baos.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    //End===========