黎活明8天快速掌握android视频教程--24_网络通信之网页源码查看器

【黎活明8天快速掌握android视频教程--24_网络通信之网页源码查看器】少年意气强不羁,虎胁插翼白日飞。这篇文章主要讲述黎活明8天快速掌握android视频教程--24_网络通信之网页源码查看器相关的知识,希望能为你提供帮助。
1 该项目的主要功能就是从将后台的html网页在android的界面上显示出来
后台就是建立一个java web工程在工程尚建立一个html或者jsp文件就可以了,这里主要看Android客户端的程序
xml文件:

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="application.weiyuan.com.lihuoming_24.MainActivity"> < TextView android:textSize="25sp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="从网页获得html源码的显示" /> < Button android:id="@+id/btn_main_download" android:textSize="25sp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="点击下载"/> < ScrollView android:layout_width="wrap_content" android:layout_height="wrap_content"> < TextView android:id="@+id/tv_main_html" android:textSize="25sp" android:layout_width="wrap_content" android:layout_height="wrap_content" /> < /ScrollView> < /LinearLayout>

上面需要注意的是采用ScrollView包裹TextView,因为后台返回的html的内容很多,可以让TextView滚动起来
业务类的操作代码是:
public class HtmlBussiess { public static String getHtml(String path) throws Exception { URL url = new URL(path); HttpURLConnection openConnection = (HttpURLConnection) url.openConnection(); openConnection.setConnectTimeout(5000); openConnection.setRequestMethod("GET"); //采用get的请求方式 openConnection.connect(); ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); InputStream inputStream = null; if(openConnection.getResponseCode() == 200){ inputStream = openConnection.getInputStream(); byte[] buffer = new byte[1024]; int len = -1; while ((len = inputStream.read(buffer)) != -1){ outputStream.write(buffer,0,len); } } inputStream.close(); returnnew String(outputStream.toByteArray(),"utf-8"); //这里的编码方式必须和后台的html编码方式一样 } }

activity控制层的代码是:
public class MainActivity extends Activity {private TextView tv_main_html; private Button btn_main_download; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initListener(); }private void initListener() { btn_main_download.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { ExecutorService executorService = Executors.newCachedThreadPool(); executorService.execute(new Runnable() { @Override public void run() { String path = "http://192.168.1.103:8080/lihuoming_23/hello.jsp"; //myeclpise建立的工程 try { final String html = HtmlBussiess.getHtml(path); runOnUiThread(new Runnable() { @Override public void run() { tv_main_html.setText(html); } }); } catch (final Exception e) { e.printStackTrace(); runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(MainActivity.this, "图片下载失败" + e.toString(), Toast.LENGTH_LONG).show(); } }); ; } } }); } }); }private void initView() { tv_main_html = (TextView) findViewById(R.id.tv_main_html); btn_main_download = (Button) findViewById(R.id.btn_main_download); } }

 

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