Android网络请求练习-白红宇

简单记录使用OkGo进行网络请求

1.添加依赖

implementation 'com.lzy.net:okgo:3.0.4'    implementation 'com.google.code.gson:gson:2.8.5'复制代码

2.新建java类

public class App extends Application {    @Override    public void onCreate() {        super.onCreate();        initOkGo();    }    private void initOkGo() {        OkHttpClient.Builder builder = new OkHttpClient.Builder();        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor("result");//这里是添加日志拦截，可在logcat中输入result查看请求到的json数据        loggingInterceptor.setPrintLevel(HttpLoggingInterceptor.Level.BODY);        loggingInterceptor.setColorLevel(Level.INFO);        builder.addInterceptor(loggingInterceptor);        builder.readTimeout(10000, TimeUnit.MILLISECONDS);      //全局的读取超时时间        builder.writeTimeout(10000, TimeUnit.MILLISECONDS);     //全局的写入超时时间        builder.connectTimeout(20000, TimeUnit.MILLISECONDS);   //全局的连接超时时间        // 其他统一的配置        OkGo.getInstance().init(this)                           //必须调用初始化                .setOkHttpClient(builder.build())               //建议设置OkHttpClient，不设置会使用默认的                .setRetryCount(0);                               }}复制代码

3.AndroidManifest.xml中添加android:name=".App"，添加网络权限

4.MainActivity添加请求简单写法

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        OkGo.
    
     post("http://***.do")                .params("account", "***")                .params("password", "***")                .execute(new JsonCallback
     
      () {                    @Override                    public void onSuccess(Response
      
        response) {                        if (response.body().getErrcode() == 0) {//                          注意这里的toString，想显示全部内容需要重写toString方法                            Toast.makeText(MainActivity.this, "成功了"+response.body().getData().toString(),                        } else {                        }                    }                    @Override                    public void onError(Response
       
         response) {                        super.onError(response);                    }                });    }}复制代码

5.测试接口，复制返回的json数据再用gsonformat生成LoginBean类

6.自定义JsonCallback

public abstract class JsonCallback
    
      extends AbsCallback
     
       {    private Type type;    private Class
      
        clz;    public JsonCallback(Type type) {        this.type = type;    }    public JsonCallback() {        this.clz = clz;    }    @Override    public T convertResponse(okhttp3.Response response) throws Throwable {        ResponseBody body = response.body();        if (body == null) return null;        T data = null;        Gson gson = new Gson();        JsonReader jsonReader = new JsonReader(body.charStream());        if (type != null) {            data = gson.fromJson(jsonReader, type);        } else if (clz != null) {            clz = gson.fromJson(jsonReader, clz);        } else {            Type genType = getClass().getGenericSuperclass();            Type type = ((ParameterizedType) genType).getActualTypeArguments()[0];            data = gson.fromJson(jsonReader, type);        }        return data;    }}复制代码

注意（网络权限适配）

测试接口中的端口号不要写错，

AndroidManifest.xml记得添加网络权限，记得打开网络

9.0及以上手机记得加适配