实现Splash页面版本自动更新

获取应用程序版本号的代码：

//用PackageManager拿到PackageInfo，PackageInfo中的versionName

PackageInfo packinfo = context.getPackageManager().getPackageInfo(

                context.getPackageName(), 0);

String version = packinfo.versionName;

获取服务器版本号的代码：

//获取服务器地址

String path = getResources().getString(R.string.url);

URL url = new URL(path);

 

//创建网络连接

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("GET");

conn.setConnectTimeout(5000);

 

//发出请求，获得返回码

int code = conn.getResponseCode();

if(code ==200){

 

    //获取服务器返回的流并进行解析

    InputStream is = conn.getInputStream();

    String result = StreamTools.readStream(is);

 

    //转化为json并解析出版本号

    JSONObject json = new JSONObject(result);

    String serverVersion = json.getString("version");

    Log.i(TAG,"服务器版本:"+serverVersion);

}

将流转化为字符串的代码：

public static String readStream(InputStream is) throws IOException{

 

    //ByteArrayOutputStream类是在创建它的实例时，程序内部创建一个byte型数组的缓冲区，缓冲区会随着数据的不断写入而自动增长。可使用 toByteArray()和 toString()获取数据

    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    byte[] buffer = new byte[1024];

    int len = -1;

    while((len = is.read(buffer))!=-1){

        baos.write(buffer, 0, len);

    }

    is.close();

    return baos.toString();

}

弹出对话框的代码：

AlertDialog.Builder builder =new Builder(this);

builder.setCancelable(false);

builder.setTitle("升级提醒");

builder.setMessage(desc);

builder.setPositiveButton("立即升级",new DialogInterface.OnClickListener()

public void onClick(DialogInterface dialog,int which) {

                pd = new ProgressDialog(SplashActivity.this);

                pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

                pd.show();

                HttpUtils http = new HttpUtils();

                File sdDir = Environment.getExternalStorageDirectory();

                File file = new File(sdDir, SystemClock.uptimeMillis()+".apk");

                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

                    http.download(downloadpath, file.getAbsolutePath(),new RequestCallBack<File>(){

                        public void onFailure(HttpException arg0, String arg1) {

                            Toast.makeText(SplashActivity.this,"下载失败", 0).show();

                            pd.dismiss();

                            loadMainUI();

                        }

                        public void onLoading(long total,long current, boolean isUploading) {

                            pd.setMax((int) total);

                            pd.setProgress((int) current);

                        };

                        public void onSuccess(ResponseInfo<File> fileinfo) {

                            pd.dismiss();

                            Toast.makeText(SplashActivity.this,"下载成功", 0).show();

                            Intent intent = new Intent();

                            intent.setAction("android.intent.action.VIEW");

                            intent.addCategory("android.intent.category.DEFAULT");

                            intent.setDataAndType(Uri

                                    .fromFile(fileinfo.result),

                                    "application/vnd.android.package-archive");

                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                            startActivity(intent);

                        }

                    });

                }else {

                    Toast.makeText(SplashActivity.this,"SDcard不可用,不可以自动更新", 0).show();

                    loadMainUI();

                }

            }

        });

builder.setNegativeButton("稍后再说",new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog,int which) {

loadMainUI();

}

});

builder.show();

}

 

下载apk的操作：

1.使用开源框架xUtils

2.使用HttpUtils的download方法，填入三个参数：服务器下载地址，手机中的存储位置、回调事件

3.回调事件中有三个常用的方法：onSuccess下载成功、onFailure下载失败、onLoading更新下载进度

 

安装apk的代码：

1.调用系统的安装apk的界面，传入对应的参数

2.具体实现方式

Intent intent = new Intent();

intent.setAction("android.intent.action.VIEW");

intent.addCategory("android.intent.category.DEFAULT");

intent.setDataAndType(

        Uri.fromFile(fileinfo.result),

        "application/vnd.android.package-archive");

startActivity(intent);