Volley网络请求

第一步：导依赖

dependencies { compile 'eu.the4thfloor.volley:com.android.volley:2015.05.28' }

第二步代码实现

1. 创建一个RequestQueue对象。

2. 创建一个StringRequest对象。

3. 将StringRequest对象添加到RequestQueue里面。

package com.example.myvolley;

import android.graphics.Bitmap; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast;

import com.android.volley.AuthFailureError; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.ImageLoader; import com.android.volley.toolbox.ImageRequest; import com.android.volley.toolbox.StringRequest; import com.android.volley.toolbox.Volley;

import java.util.HashMap; import java.util.Map;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

1private Button but1;
2private Button but2;
3private ImageView img1;
4private Button but3;
5private ImageView img2;
6private Button but4;
7public static final String URLPOSTSTRING = "http://172.16.45.49:8080/day13/servlet/demo";
8public static final String URLIMG = "http://img.my.csdn.net/uploads/201403/03/1393854083\_6511.jpg";
9public static final String URLSTRING = "http://112.124.22.238:8081/course\_api/cniaoplay/featured2?p={%22page%22:0}";
10
11@Override
12protected void onCreate(Bundle savedInstanceState) {
13    super.onCreate(savedInstanceState);
14    setContentView(R.layout.activity\_main);
15    initView();
16}
17
18private void initView() {
19    but1 = (Button) findViewById(R.id.but1);
20    but2 = (Button) findViewById(R.id.but2);
21    img1 = (ImageView) findViewById(R.id.img1);
22    but3 = (Button) findViewById(R.id.but3);
23    img2 = (ImageView) findViewById(R.id.img2);
24    but4 = (Button) findViewById(R.id.but4);
25
26    but1.setOnClickListener(this);
27    but2.setOnClickListener(this);
28    but3.setOnClickListener(this);
29    but4.setOnClickListener(this);
30}
31
32@Override
33public void onClick(View v) {
34    switch (v.getId()) {
35        case R.id.but1:
36            requestStringGet();
37            break;
38        case R.id.but2:
39            requsetImgGet();
40            break;
41        case R.id.but3:
42            requsetImgLoaderGet();
43            break;
44        case R.id.but4:
45            requsetPost();
46            break;
47    }
48}

    //POST请求字符串 private void requsetPost() { RequestQueue requestQueue = Volley.newRequestQueue(this); StringRequest stringRequest = new StringRequest(Request.Method.POST, URLPOSTSTRING, new Response.Listener<String>() { @Override public void onResponse(String response) { Toast.makeText(MainActivity.this, response, Toast.LENGTH_SHORT).show(); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) {

1        }
2    }){
3        @Override
4        protected Map<String, String> getParams() throws AuthFailureError {
5            HashMap<String,String> map = new HashMap<>();
6            map.put("username", "abc");
7            map.put("password", "123");
8            return map;
9        }
10    };
11    requestQueue.add(stringRequest);
12}

    //Get请求图片--缩放模式 private void requsetImgLoaderGet() { RequestQueue requestQueue = Volley.newRequestQueue(this); ImageLoader imageLoader = new ImageLoader(requestQueue, new ImageLoader.ImageCache() { @Override public Bitmap getBitmap(String url) { return null; } @Override public void putBitmap(String url, Bitmap bitmap) { } }); ImageLoader.ImageListener imageListener = ImageLoader.getImageListener(img2,R.mipmap.ic_launcher, R.mipmap.ic_launcher); imageLoader.get(URLIMG,imageListener); }     //Get请求图片 private void requsetImgGet() { RequestQueue requestQueue =Volley.newRequestQueue(this); ImageRequest imageRequest = new ImageRequest(URLIMG, new Response.Listener<Bitmap>() { @Override public void onResponse(Bitmap response) { img1.setImageBitmap(response); } }, 0, 0, Bitmap.Config.RGB_565, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) {

1        }
2    });
3    requestQueue.add(imageRequest);
4}

    //Get请求字符串 private void requestStringGet() { RequestQueue requestqueue = Volley.newRequestQueue(this); StringRequest stringRequest = new StringRequest(Request.Method.GET,URLSTRING, new Response.Listener<String>() { @Override public void onResponse(String response) { Toast.makeText(MainActivity.this, response, Toast.LENGTH_SHORT).show(); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) {

1        }
2    });
3    requestqueue.add(stringRequest);
4}

}