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安卓学习之网络技术(十)

發(fā)布時間：2024/2/28 编程问答 31 豆豆

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一. 顯示web頁面

添加布局。使用webView

添加權(quán)限<user-permission android:name = “android.permission.INTERNET”>

加載布局，webView，并作出對應(yīng)的設(shè)置。

WebView webView = (WebView)findViewById(R.id.web_view); webView.getSettings().setJavaScriptEnabled(true); webView.setWebViewClient(new WebViewClient()); webView.loadUrl("http://www.baidu.com");

二. 訪問網(wǎng)絡(luò)的方法

方法一：HttpURLConnection（不推薦）

URL url = new URL("https://www.qq.com/"); connection = (HttpURLConnection)url.openConnection(); connection.setRequestMethod("GET"); connection.setConnectTimeout(8000); connection.connect(); InputStream in = connection.getInputStream(); reader = new BufferedReader(new InputStreamReader(in)); StringBuffer respose = new StringBuffer(); String line ;while((line = reader.readLine()) != null) {respose.append(line); } showRespose(respose.toString());

方法二：OKHttp（推薦）

在 app/build.gradle 添加依賴

dependencies {implementation 'com.squareup.okhttp3:okhttp:3.14.1' }

發(fā)送請求

OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("http://www.baidu.com") .build(); Response response = client.newCall(request).execute(); String resposeDate = response.body().string();

三. 使用OKHttp和GSON解析JSON格式數(shù)據(jù)

準備Json格式的數(shù)據(jù)
1)sudo apachectl start打開mac自帶的apache服務(wù)器
2)在/Library/WebServer/Documents目錄下創(chuàng)建get_data.json文件，內(nèi)容為
[{"id":"5","version":"5.5","name":"Clash of CLans"},{"id":"6","version":"7.0","name":"Boom Beach"},{"id":"7","version":"3.5","name":"Clash Royal"}]
3)瀏覽器訪問localhost/get_data.json查看數(shù)據(jù)

添加GSON的依賴

dependencies {implementation 'com.squareup.okhttp3:okhttp:3.14.1'implementation 'com.google.code.gson:gson:2.8.5' }

使用OKHttp訪問網(wǎng)絡(luò)

OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder().url("http://192.168.1.155/get_data.json")//注意不要寫localhost或者127.0.0.1.build(); Response response = client.newCall(request).execute(); String resposeDate = response.body().string();

使用GSON解析數(shù)據(jù)

Gson gson = new Gson(); List<People> peoples = gson.fromJson(data , new TypeToken<List<People>>(){}.getType()); for(People p : peoples){Log.d("MainActivity","id is : "+p.getId()); Log.d("MainActivity","name is : "+p.getName());Log.d("MainActivity","version is : "+p.getVersion());

如果json格式不是一個數(shù)組的話

People peoples = gson.fromJson(data , People.class);