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:


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    private static     AsyncHttpClient client =new AsyncHttpClient();    //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    public static 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    public static void get(String urlString,RequestParams params,AsyncHttpResponseHandler res)   //url里面带参数
19    {
20        client.get(urlString, params,res);
21    }
22    public static 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    public static 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    public static 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    public static AsyncHttpClient getClient()
35    {
36        return client;
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:

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 extends Activity {
024    private TextView textView; // 顶部textview
025    private ProgressDialog pDialog;
026    private TextView textView2; // 下面textview,显示获取的所有数据
027    @Override
028    protected void 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    public void 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            public void 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            public void onFailure(Throwable arg0) { // 失败,调用
045                Toast.makeText(MainActivity.this, "onFailure",
046                        Toast.LENGTH_LONG).show();
047            };
048            public void onFinish() { // 完成后调用,失败,成功,都要掉
049            };
050        });
051    }
052    public void 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            public void 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            public void onFailure(Throwable arg0) {
069                Log.e("hck", " onFailure" + arg0.toString());
070            };
071            public void onFinish() {
072                Log.i("hck", "onFinish");
073            };
074            public void 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    public void 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            public void 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    public void method4(View view) {
101        String urlString = "http://client.azrj.cn/json/cook/cook_list.jsp?";
102        final RequestParams params = new RequestParams();
103        params.put("type", "1");
104        params.put("p", "2");
105        params.put("size", "10");
106        HttpUtil.get(urlString, params, new AsyncHttpResponseHandler() {
107            public void 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    public void 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            public void 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:


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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