第一步：在MainActivity.xml中添加 interNet 权限

     第二步：在gradle中导入依赖包

compile 'com.mcxiaoke.volley:library:1.0.19' 第三步：创建Java和XML文件

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1 package homepage.yhm.com.voellydemo;  2   3 import android.app.Activity;  4 import android.app.DownloadManager;  5 import android.content.Intent;  6 import android.os.Handler;  7 import android.os.Bundle;  8 import android.os.Message;  9 import android.util.Log; 10 import android.view.View; 11 import android.widget.Button; 12 import android.widget.TextView; 13  14 import com.android.volley.Request; 15 import com.android.volley.Response; 16 import com.android.volley.VolleyError; 17 import com.android.volley.toolbox.StringRequest; 18 import com.android.volley.toolbox.Volley; 19  20  21 public class MainActivity extends Activity { 22  23     private TextView text_view = null; 24     private Button start = null; 25     private Button end = null; 26     private Button clear = null; 27     private Button jump = null; 28  29     //使用handler时首先要创建一个handler 30     Handler handler = new Handler(){ 31         @Override 32         public void handleMessage(Message msg) { 33             text_view.setText(msg.obj.toString()); 34 //            switch (msg.what){ 35 //                case 1: 36 //                    text_view.setText(msg.obj.toString()); 37 //                    break; 38 //                case 2: 39 //                    text_view.setText(msg.obj.toString()); 40 //                    break; 41 //            } 42         } 43     }; 44     //要用handler来处理多线程可以使用runnable接口，这里先定义该接口 45     //线程中运行该接口的run函数 46     Runnable update_thread = new Runnable() { 47         public void run() { 48             //线程每次执行时输出"UpdateThread..."文字,且自动换行 49             //textview的append功能和Qt中的append类似，不会覆盖前面 50             //的内容，只是Qt中的append默认是自动换行模式 51 //            text_view.append("\nUpdateThread..."); 52             //延时1s后又将线程加入到线程队列中 53 //            handler.postDelayed(update_thread, 1000); 54             // 55  56 //            StringRequest stringRequest = new StringRequest(Request.Method.GET,"http://www.baidu.com", new Response.Listener
     
       (){ 57 //                public void onResponse(String response){ 58 //                    Message message = handler.obtainMessage(); 59 //                    message.obj = response; 60 //                    message.what = 1; 61 //                    handler.sendMessage(message); 62 //                    Log.d("baidu",response); 63 //                }; 64 //            }, new Response.ErrorListener() { 65 //                @Override 66 //                public void onErrorResponse(VolleyError error) { 67 //                    Message message = handler.obtainMessage(); 68 //                    message.obj = error.getMessage(); 69 //                    message.what = 2; 70 //                    handler.sendMessage(message); 71 //                } 72 //            }); 73             Volley.newRequestQueue(MainActivity.this).add(new StringRequest(Request.Method.GET,"http://www.baidu.com", new Response.Listener
      
        (){ 74                 public void onResponse(String response){ 75                     Message message = handler.obtainMessage(); 76                     message.obj = response; 77                     message.what = 1; 78                     handler.sendMessage(message); 79                     Log.d("baidu",response); 80                 }; 81             }, new Response.ErrorListener() { 82                 @Override 83                 public void onErrorResponse(VolleyError error) { 84                     Message message = handler.obtainMessage(); 85                     message.obj = error.getMessage(); 86                     message.what = 2; 87                     handler.sendMessage(message); 88                 } 89             })); 90  91  92  93         } 94     }; 95  96     @Override 97     public void onCreate(Bundle savedInstanceState) { 98         super.onCreate(savedInstanceState); 99         setContentView(R.layout.activity_main);100 101         text_view = (TextView) findViewById(R.id.text_view);102         start = (Button) findViewById(R.id.start);103         start.setOnClickListener(new StartClickListener());104         end = (Button) findViewById(R.id.end);105         end.setOnClickListener(new EndClickListener());106 107         clear = (Button) findViewById(R.id.clear);108         clear.setOnClickListener(new View.OnClickListener() {109             @Override110             public void onClick(View v) {111                 text_view.setText(null);112             }113         });114 115 //116         jump = (Button) findViewById(R.id.jump);117         jump.setOnClickListener(new View.OnClickListener() {118             @Override119             public void onClick(View v) {120                 Intent i = new Intent();121                 i.setClass(MainActivity.this, Login.class);122                 startActivity(i);123             }124         });125 126     }127 128     private class StartClickListener implements View.OnClickListener {129         public void onClick(View v) {130             // TODO Auto-generated method stub131             //将线程接口立刻送到线程队列中132             handler.post(update_thread);133         }134     }135 136     private class EndClickListener implements View.OnClickListener {137         public void onClick(View v) {138             // TODO Auto-generated method stub139             //将接口从线程队列中移除140             handler.removeCallbacks(update_thread);141         }142 143     }144 145 }