android开源框架android-async-http使用

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android-async-http开源框架可以是我们轻松的获取网络数据或者向服务器发送数据，使用起来也很简单，下面做简单介绍，具体详细使用看官网：https://github.com/loopj/android-async-http

1.新建项目，去官网下载zip包，解压，打开releases文件，把里面最新的jar包，考入项目工程libs目录下，引入包。

2.通过1，就可以使用了，很简单，下面是自己写的demo，用它提供的各种不同方法完成从服务器获取一个json数据：

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01package com.http; 
02import com.loopj.android.http.AsyncHttpClient; 
03import com.loopj.android.http.AsyncHttpResponseHandler; 
04import com.loopj.android.http.BinaryHttpResponseHandler; 
05import com.loopj.android.http.JsonHttpResponseHandler; 
06import com.loopj.android.http.RequestParams; 
07  
08public class HttpUtil { 
09    privatestatic     AsyncHttpClient client =newAsyncHttpClient();    //实例话对象
10    static
11    { 
12        client.setTimeout(11000);  //设置链接超时，如果不设置，默认为10s 
13    } 
14    publicstatic void get(String urlString,AsyncHttpResponseHandler res)    //用一个完整url获取一个string对象
15    { 
16        client.get(urlString, res);
17    } 
18    publicstatic void get(String urlString,RequestParams params,AsyncHttpResponseHandler res)   //url里面带参数 
19    { 
20        client.get(urlString, params,res);
21    } 
22    publicstatic void get(String urlString,JsonHttpResponseHandler res)   //不带参数，获取json对象或者数组
23    { 
24        client.get(urlString, res);
25    } 
26    publicstatic void get(String urlString,RequestParams params,JsonHttpResponseHandler res)   //带参数，获取json对象或者数组
27    { 
28        client.get(urlString, params,res);
29    } 
30    publicstatic void get(String uString, BinaryHttpResponseHandler bHandler)   //下载数据使用，会返回byte数据
31    { 
32        client.get(uString, bHandler);
33    } 
34    publicstatic AsyncHttpClient getClient()
35    { 
36        returnclient; 
37    } 
38}

这个类主要列出了我们常用的get方法，在要使用的地方，调用该类就行了。

具体使用的类：

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001package com.http; 
002  
003import java.io.File; 
004import java.io.FileOutputStream; 
005  
006import org.json.JSONArray; 
007import org.json.JSONObject; 
008  
009import android.app.Activity; 
010import android.app.ProgressDialog; 
011import android.os.Bundle; 
012import android.os.Environment; 
013import android.util.Log; 
014import android.view.View; 
015import android.widget.TextView; 
016import android.widget.Toast; 
017  
018import com.loopj.android.http.AsyncHttpResponseHandler; 
019import com.loopj.android.http.BinaryHttpResponseHandler; 
020import com.loopj.android.http.JsonHttpResponseHandler; 
021import com.loopj.android.http.RequestParams; 
022  
023public class MainActivity extendsActivity { 
024    privateTextView textView; // 顶部textview
025    privateProgressDialog pDialog; 
026    privateTextView textView2; // 下面textview，显示获取的所有数据
027    @Override
028    protectedvoid onCreate(Bundle savedInstanceState) {
029        super.onCreate(savedInstanceState);
030        setContentView(R.layout.activity_main);
031        textView = (TextView) findViewById(R.id.text);
032        textView2 = (TextView) findViewById(R.id.text2);
033    } 
034    publicvoid method1(View view) {
035        pDialog = ProgressDialog.show(this,"请稍等", "数据加载中");
036        String urlString ="http://client.azrj.cn/json/cook/cook_list.jsp?type=1&p=2&size=10"; // 一個獲取菜谱的url地址
037        HttpUtil.get(urlString,new AsyncHttpResponseHandler() {
038            publicvoid onSuccess(String arg0) {// 获取数据成功会调用这里 
039                pDialog.dismiss();
040                textView.setText("获取json数据成功，看下面");
041                textView2.setText(arg0);
042                Log.i("hck", arg0);
043            };
044            publicvoid onFailure(Throwable arg0) {// 失败，调用 
045                Toast.makeText(MainActivity.this,"onFailure", 
046                        Toast.LENGTH_LONG).show();
047            };
048            publicvoid onFinish() { // 完成后调用，失败，成功，都要掉 
049            };
050        });
051    } 
052    publicvoid method2(View view) {
053        String urlString ="http://client.azrj.cn/json/cook/cook_list.jsp?";
054        RequestParams params =new RequestParams();// 绑定参数 
055        params.put("type","1"); 
056        params.put("p","2"); 
057        params.put("size","10"); 
058        HttpUtil.get(urlString, params,new JsonHttpResponseHandler() {
059            publicvoid onSuccess(JSONArray arg0) {// 成功后返回一个JSONArray数据 
060                Log.i("hck", arg0.length() +""); 
061                try{ 
062                    textView.setText("菜谱名字："
063                            + arg0.getJSONObject(2).getString("name"));//返回的是JSONArray， 获取JSONArray数据里面的第2个JSONObject对象，然后获取名字为name的数据值
064                }catch (Exception e) {
065                    Log.e("hck", e.toString());
066                }
067            };
068            publicvoid onFailure(Throwable arg0) {
069                Log.e("hck"," onFailure" + arg0.toString());
070            };
071            publicvoid onFinish() { 
072                Log.i("hck","onFinish"); 
073            };
074            publicvoid onSuccess(JSONObject arg0) {  //返回的是JSONObject，会调用这里 
075                Log.i("hck","onSuccess "); 
076                try{ 
077                    textView.setText("菜谱名字："
078                            + arg0.getJSONArray("list").getJSONObject(0)
079                                    .getString("name"));
080                }catch (Exception e) {
081                    Log.e("hck", e.toString());
082                }
083            };
084        });
085    } 
086    publicvoid method3(View view) {
087        String urlString ="http://client.azrj.cn/json/cook/cook_list.jsp?type=1&p=2&size=10";
088        HttpUtil.get(urlString,new JsonHttpResponseHandler() {
089            publicvoid onSuccess(JSONObject arg0) {
090                try{ 
091                    textView.setText("菜谱名字："
092                            + arg0.getJSONArray("list").getJSONObject(1)
093                                    .getString("name"));
094                }catch (Exception e) {
095                    Log.e("hck", e.toString());
096                }
097            };
098        });
099    } 
100    publicvoid method4(View view) {
101        String urlString ="http://client.azrj.cn/json/cook/cook_list.jsp?";
102        finalRequestParams params = newRequestParams(); 
103        params.put("type","1"); 
104        params.put("p","2"); 
105        params.put("size","10"); 
106        HttpUtil.get(urlString, params,new AsyncHttpResponseHandler() {
107            publicvoid onSuccess(String arg0) {
108                try{ 
109                    JSONObject jObject =new JSONObject(arg0);
110                    textView.setText("菜谱名字："
111                            + jObject.getJSONArray("list").getJSONObject(2)
112                                    .getString("name"));
113                    Log.i("hck", params.getEntity().toString());
114                }catch (Exception e) {
115                }
116            };
117        });
118    } 
119    publicvoid method5(View view) {
120        String url ="http://f.hiphotos.baidu.com/album/w%3D2048/sign=38c43ff7902397ddd6799f046dbab3b7/9c16fdfaaf51f3dee973bf7495eef01f3b2979d8.jpg";
121        HttpUtil.get(url,new BinaryHttpResponseHandler() {
122            @Override
123            publicvoid onSuccess(byte[] arg0) {
124                super.onSuccess(arg0);
125                File file = Environment.getExternalStorageDirectory();
126                File file2 =new File(file, "cat"); 
127                file2.mkdir();
128                file2 =new File(file2,"cat.jpg"); 
129                try{ 
130                    FileOutputStream oStream =new FileOutputStream(file2);
131                    oStream.write(arg0);
132                    oStream.flush();
133                    oStream.close();
134                    textView.setText("可爱的猫咪已经保存在sdcard里面");
135                }catch (Exception e) {
136                    e.printStackTrace();
137                    Log.i("hck", e.toString());
138                }
139            }
140        });
141    } 
142}

布局文件：

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01<ScrollView
02    xmlns:android="http://schemas.android.com/apk/res/android"
03    xmlns:tools="http://schemas.android.com/tools"
04    android:layout_width="match_parent"
05    android:layout_height="match_parent"
06    android:orientation="vertical"
07      android:gravity="center_horizontal"
08    > 
09    <LinearLayout
10    android:layout_width="fill_parent"
11    android:layout_height="fill_parent"
12    android:orientation="vertical"
13      android:gravity="center_horizontal">
14    <TextView
15        android:textColor="#FF0000"
16        android:textSize="16sp"
17       android:layout_marginTop="20dp"
18     android:gravity="center_horizontal"
19        android:id="@+id/text"
20        android:layout_width="wrap_content"
21        android:layout_height="wrap_content"
22        android:text="获取数据完成后会显示在这里"/> 
23<Button
24    android:layout_marginTop="50dp"
25    android:id="@+id/bt1"
26    android:layout_width="wrap_content"
27    android:layout_height="wrap_content"
28    android:text="第一种"
29    android:onClick="method1"
30    /> 
31<Button
32    android:id="@+id/bt2"
33    android:layout_width="wrap_content"
34    android:layout_height="wrap_content"
35    android:text="第2种"
36    android:onClick="method2"
37    /> 
38<Button
39    android:id="@+id/bt3"
40    android:layout_width="wrap_content"
41    android:layout_height="wrap_content"
42    android:text="第3种"
43      android:onClick="method3"
44    /> 
45<Button
46    android:id="@+id/bt4"
47    android:layout_width="wrap_content"
48    android:layout_height="wrap_content"
49    android:text="第4种"
50      android:onClick="method4"
51    /> 
52<Button
53    android:id="@+id/bt5"
54    android:layout_width="wrap_content"
55    android:layout_height="wrap_content"
56    android:text="第5种"
57      android:onClick="method5"
58    /> 
59  <TextView
60        android:textColor="#FF0000"
61        android:textSize="16sp"
62       android:layout_marginTop="20dp"
63     android:gravity="center_horizontal"
64        android:id="@+id/text2"
65        android:layout_width="wrap_content"
66        android:layout_height="wrap_content"
67         />
68</LinearLayout>
69</ScrollView>

很简单很实用，上面只是get方法的，上传数据，和这个也差不多，大家自己建个服务器，试试。记得加入网文网络的权限和向sdcard的访问权限

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