Android网络请求练习

implementation 'com.lzy.net:okgo:3.0.4'
    implementation 'com.google.code.gson:gson:2.8.5'
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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);                           
    }
}
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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.<LoginBean>post("http://***.do")
                .params("account", "***")
                .params("password", "***")
                .execute(new JsonCallback<LoginBean>() {
                    @Override
                    public void onSuccess(Response<LoginBean> 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<LoginBean> response) {
                        super.onError(response);
                    }
                });

    }

}
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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<T> extends AbsCallback<T> {
    private Type type;
    private Class<T> 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;
    }
}

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