OkHttp的基本使用

第一，先导入依赖包

compile 'com.squareup.okio:okio:1.5.0'
    compile 'com.squareup.okhttp3:okhttp:3.2.0'
    compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
    compile 'com.google.code.gson:gson:2.8.2'

第二，导入utils包

   五个类（GsonArrayCallback.java,GsonObjectCallback.java,NetWorkUtils.java,OkHttp3Utils.java,MyApp.java）

第三,添加权限

 

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>

MainActivity

public class MainActivity extends AppCompatActivity{

     String url = "http://www.93.gov.cn/93app/data.do?";

     @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView) findViewById(R.id.tv);
        tv_result = (TextView) findViewById(R.id.tv_result);
        boolean netWorkAvailable = NetWorkUtils.isNetWorkAvailable(this);
        if (!netWorkAvailable) {
            Toast.makeText(MainActivity.this, "联网：" + netWorkAvailable, Toast.LENGTH_SHORT).show();
        }
        getData();
      
    }

    private void getData() {
        OkHttp3Utils.getInstance().doGet(url, new GsonObjectCallback<User>() {

            @Override
            public void onUi(User user) {
                user.getData().get(0).getTITLE();


            }

            @Override
            public void onFailed(Call call, IOException e) {

            }
        });
        }

}