android 网络获取字符串

获取网络数据 &1.0&vedi&http://192.168.1.105:5236/vedio/APK.apk

public class UpdateInfoService {
    public UpdateInfoService(Context context) {
    }

    public UpdateInfo getUpDateInfo() throws Exception {
        String path = GetServerUrl.getUrl() + "/update.txt";
        StringBuffer sb = new StringBuffer();
        String line = null;
        BufferedReader reader = null;
        try {
            // 创建一个url对象0
            URL url = new URL(path);
            // 通過url对象，创建一个HttpURLConnection对象（连接）
            HttpURLConnection urlConnection = (HttpURLConnection) url
                    .openConnection();
            // 通过HttpURLConnection对象，得到InputStream
            reader = new BufferedReader(new InputStreamReader(
                    urlConnection.getInputStream()));
            // 使用io流读取文件
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        String info = sb.toString();
        UpdateInfo updateInfo = new UpdateInfo();
        updateInfo.setVersion(info.split("&")[1]);
        updateInfo.setDescription(info.split("&")[2]);
        updateInfo.setUrl(info.split("&")[3]);
        //返回实体类
        return updateInfo;
    }
}

实体类

public class UpdateInfo {
     private String version;
     private String description;
     private String url;

     public String getVersion()
     {
             return version;
     }
     public void setVersion(String version)
     {
             this.version = version;
     }
     public String getDescription()
     {
             return description;
     }
     public void setDescription(String description)
     {
             this.description = description;
     }
     public String getUrl()
     {
             return url;
     }
     public void setUrl(String url)
     {
             this.url = url;
     }

}

获取网络访问的路径
GetServerUrl.getUrl()

public class GetServerUrl {
        public static String getUrl() {
            return application.getupdataurl;
        }
}

在activity 执行注意线程问题

new Thread() {
                public void run() {
                    try {
                        UpdateInfoService updateInfoService = new UpdateInfoService(
                                AdvertiselMainActivity.this);
                        info = updateInfoService.getUpDateInfo();
//                      当从服务器捞到的数据等于  “vedio” 更新视频
                        if(info.getDescription().equals("vedio")){
                              fileRW.deleteFile();
                         }
                        Message message = new Message();
                        message.what = 0;
                        handler.sendMessage(message);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                };
            }.start();

发送消息是要执行

public Handler handler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case 0:
                if (isNeedUpdate()) {
                    Handler handle=new Handler();
                    handle.postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            downFile(info.getUrl());
                        }
                    },1000*5);
                }
                break;
        }
    };

下面执行文件下载 downFile(info.getUrl()) 执行这个方法

    void downFile(final String url) { 
            pBar = new ProgressDialog(AdvertiselMainActivity.this);    //进度条，在下载的时候实时更新进度，提高用户友好度
            pBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            pBar.setTitle("正在下载");
            pBar.setMessage("请稍候...");
            pBar.setProgress(0);
            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();
                        int length = (int) entity.getContentLength();   //获取文件大小
                                            pBar.setMax(length);        //设置进度条的总长度
                        InputStream is = entity.getContent();
                        FileOutputStream fileOutputStream = null;
                        if (is != null) {
                            File file = new File(
                                    Environment.getExternalStorageDirectory(),
                                    "NICE.apk");
                            fileOutputStream = new FileOutputStream(file);

                            byte[] buf = new byte[1024];   
                            int ch = -1;
                            int process = 0;
                            while ((ch = is.read(buf)) != -1) {       
                                fileOutputStream.write(buf, 0, ch);
                                process += ch;
                                pBar.setProgress(process);       
                            }

                        }
                        fileOutputStream.flush();
                        if (fileOutputStream != null) {
                            fileOutputStream.close();
                        }
                        down();
                    } catch (ClientProtocolException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

            }.start();
        }

下面执行down()方法

void down() {
            handler.post(new Runnable() {
                public void run() {
                    pBar.cancel();
                    update();
                }
            });
        }
        void update() {
            Toast.makeText(AdvertiselMainActivity.this, "下载之后更新", Toast.LENGTH_LONG).show();
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "NICE.apk")),
                    "application/vnd.android.package-archive");
            startActivity(intent);
        }

整个流程记录一下，对于下次项目使用做更好的使用