Volly Demo之StringRequest

第一步：在MainActivity.xml中添加 interNet 权限

<uses-permission android:name="android.permission.INTERNET" />

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

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5  >
 6
 7     <Button
 8         android:id="@+id/start"
 9         android:layout_width="match_parent"
10         android:layout_height="50dp"
11         android:text="start"
12         />
13
14     <Button
15     android:id="@+id/end"
16     android:layout_width="match_parent"
17     android:layout_height="50dp"
18     android:text="end"
19     android:layout_below="@+id/start"
20     />
21     <Button
22         android:layout_width="match_parent"
23         android:layout_height="50dp"
24         android:id="@+id/clear"
25         android:layout_below="@+id/end"
26         android:text="clear"
27         />
28     <Button
29         android:layout_width="match_parent"
30         android:layout_height="50dp"
31         android:id="@+id/jump"
32         android:layout_below="@+id/clear"
33         android:text="jump"
34         />
35     <TextView
36         android:id="@+id/text_view"
37         android:layout_width="match_parent"
38         android:layout_height="match_parent"
39         android:layout_below="@+id/jump"
40         />
41 </RelativeLayout>

  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<String> (){
 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<String> (){
 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             @Override
110             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             @Override
119             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 stub
131             //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 stub
139             //将接口从线程队列中移除
140             handler.removeCallbacks(update_thread);
141         }
142
143     }
144
145 }