第一行代码-常见网络工具基本使用

1. webView

   settings = webview.getSettings();
   settings.setJavaScriptEnabled(true);
   webview.setWebViewClient(new WebViewClient() {
               @Override
               public void onPageStarted(WebView view, String url, Bitmap favicon) {
                   super.onPageStarted(view, url, favicon);
                   pb.setVisibility(View.VISIBLE);
               }
   
               @Override
               public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                   //所有跳转强制在当前页面跳转，不跳游览器
                   webview.loadUrl(url);
                   return true;
               }
   
               @Override
               public void onPageFinished(WebView view, String url) {
                   super.onPageFinished(view, url);
                   pb.setVisibility(View.INVISIBLE);
               }
           });
   
   webview.setWebChromeClient(new WebChromeClient() {
               @Override
               public void onReceivedTitle(WebView view, String title) {
                   super.onReceivedTitle(view, title);
               }
   
               @Override
               public void onProgressChanged(WebView view, int newProgress) {
                   super.onProgressChanged(view, newProgress);
               }
           });
   
           webview.loadUrl(url);
   
    @Override
       public void onBackPressed() {
           if (webview.canGoBack()) {
               webview.goBack();
           } else {
               finish();
           }
       }
   

    

2. HttpUrlConnection

   URL url = new URL(urlSpec);
       HttpURLConnection connection = (HttpURLConnection)url.openConnection();
   
       try {
           ByteArrayOutputStream out  = new ByteArrayOutputStream();
           InputStream in = connection.getInputStream();
   
           if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
               throw new IOException(connection.getResponseMessage()+":with" +urlSpec);
           }
           int bytesRead = 0;
           byte[] buffer = new byte[1024];
           while ((bytesRead = in.read(buffer))>0) {
               out.write(buffer, 0, bytesRead);
           }
           out.close();
           return out.toByteArray();
       } finally {
           connection.disconnect();
       }
   }

3. Okhttp

   implementation 'com.squareup.okhttp3:okhttp:3.11.0'
   
   public void Ok(){
       new Thread(new Runnable() {
           @Override
           public void run() {
               try {
                   //get
                   OkHttpClient client=new OkHttpClient();
                   Request request=new Request.Builder()
                           .url("http://www.baidu.com")
                           .build();
                   Response response=client.newCall(request).execute();
                   String responseData=response.body().string();
   
                   //post
                   RequestBody body=new FormBody.Builder()
                           .add("username","scy")
                           .add("password","123")
                           .build();
                   Request request1=new Request.Builder()
                           .post(body)
                           .url("http://wwww.baidu.com")
                           .build();
                   String responseData1=client.newCall(request).execute().body().string();
                   System.out.println(responseData);
                   System.out.println(responseData1);
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }).start();
    }

    

4. Retrofit

   implementation 'com.squareup.okhttp3:okhttp:3.12.1'
   implementation 'com.squareup.retrofit2:retrofit:2.5.0'
   
   public interface PhotoService {
   
       @GET("photos/photos_1.json")
       Call<ResponsePhotoData> getPhotoAnswers();
   
   }
   
   public class RetrofitClient {
   
       private static Retrofit retrofit = null;
   
       public static  Retrofit getClient(String baseUrl) {
           if (retrofit==null) {
               retrofit = new Retrofit.Builder()
                       .baseUrl(baseUrl)
                       .addConverterFactory(GsonConverterFactory.create())
                       .build();
           }
           return retrofit;
       }
   }
   
   public static PhotoService getPhotoService() {
           return RetrofitClient.getClient(BASE_URL).create(PhotoService.class);
   }
   
   ApiUtils.getPhotoService().getPhotoAnswers().enqueue(new Callback<ResponsePhotoData>() {
               @Override
               public void onResponse(Call<ResponsePhotoData> call, Response<ResponsePhotoData> response) {
                   mResponsePhotoData = response.body();
                   setData();
               }
   
               @Override
               public void onFailure(Call<ResponsePhotoData> call, Throwable t) {
   
               }
           });
   
   

   

5.