安卓网络访问工具类

这个网络工具类，需要添加2个jar包。分别是okhttp和okio  jar包。获取直接gradle进行构建下载
implementation 'com.squareup.okhttp3:okhttp:3.10.0'
关于更加复杂的使用。请参考如下文章：https://www.jianshu.com/p/da4a806e599b

本类的使用方法如下：
初始化，需要传入handler。用于网络获取数据后，返回数据用于UI操作。基本使用方法如下

private Handler handler=new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message message) {
switch (message.what){
case 1:

Strubf result=httpUtils.getResult();
break;
}
return false;
}
});




HttpHelper httpUtils=new HttpHelper(handler);
httpUtils.post(url,json,1);






public class HttpHelper {
    private MediaType JSON=MediaType.parse("application/json;charset=utf-8");
    private OkHttpClient client=new OkHttpClient();
    private String result;
    private Handler handler;

    public HttpHelper(Handler handler) {
        this.handler = handler;
    }

    public String getResult() {
        return result;
    }
    public  void post(String url,String json,final  int code){
        RequestBody body=RequestBody.create(JSON,json);
    final Request request=new Request.Builder()
            .url(url)
            .post(body)
            .build();
    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Request request, IOException e) {

        }

        @Override
        public void onResponse(Response response) throws IOException {
                            result=response.body().string();
                            handler.sendEmptyMessage(code);
        }
    });
    }

    public void getPic(String url,final int code){
        OkHttpClient okHttpClient=new OkHttpClient();
        Request request=new Request.Builder()
                .url(url)
                .build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Request request, IOException e) {

            }

            @Override
            public void onResponse(Response response) throws IOException {
                InputStream inputStream=response.body().byteStream();
                Bitmap bitmap= BitmapFactory.decodeStream(inputStream);
                Message msg=new Message();
                msg.what=code;
                msg.obj=bitmap;
                handler.sendMessage(msg);
            }
        });
    }

}