OKHttp访问网络

build.gradle文件设置

 compile 'com.squareup.okhttp3:okhttp:3.4.1'

判断获取数据的途径

 private String mResult;
 String cacheData=getDataFromLocal();
        if (!TextUtils.isEmpty(cacheData)) {
            mResult = cacheData;
            System.out.println("从本地加载数据"+mResult);
        }else {
            mResult=getDataFromNet();
            System.out.println("从网络获取数据" );
        }
        tv.setText(mResult);//装载数据

从网络获取数据

OkHttpClient client = new OkHttpClient();
String url = "http://www.oschina.net";
//构建一个请求
Request request = new Request.Builder().url(url).build();
//请求执行
Response response = client.newCall(request).execute();
String result = response.body().string();

把数据缓存到本地

File file=new File(getCacheDir(),"/xxx");
//读文件
BufferedWriter writer=null;
writer= new BufferedWriter(new FileWriter(file));
writer.write(result);

从本地读取数据

File file = new File(getCacheDir(),"/xxx");
if (file.exists()) {
    BufferedReader reader =null;
    reader=new BufferedReader(new FileReader(file));
    String tempLine = null;
    StringBuffer sb = new StringBuffer();
    while ((tempLine = reader.readLine()) != null) {
    sb.append(tempLine);
    }
    return sb.tostring;
}