android取得json数据

步骤一：页面返回JSON数据。 

对本空间日志“php和AJAX的简单实现”的json.php代码做一些简单修改，代码如下：将代码 echo $_GET['jsoncallback'].'('.custom_json::encode($big_test).')'; 

改为 echo $_GET['jsoncallback'].custom_json::encode($big_test); 

将文件另存为jsondata.php。 

步骤二：编写Android代码。 

1.编写Contact类，设置set和get方法。 

package com.domain; 

public class Contact { 
private String name; 
private int age; 
private int sex; 
private Double height; 
private boolean is_human; 
private String string; 

public Contact() { } 

public Contact(String name, int age, int sex, Double height, 
   boolean is_human, String string) { 
  this.name = name; 
  this.age = age; 
  this.sex = sex; 
  this.height = height; 
  this.is_human = is_human; 
  this.string = string; 
} 
public String getName() { 
return name; 
} 

public void setName(String name) { 
this.name = name; 
} 

public int getAge() { 
return age; 
} 

public void setAge(int age) { 
this.age = age; 
} 

public int getSex() { 
return sex; 
} 

public void setSex(int sex) { 
this.sex = sex; 
} 

public Double getHeight() { 
return height; 
} 

public void setHeight(Double height) { 
this.height = height; 
} 

public boolean isIs_human() { 
return is_human; 
} 

public void setIs_human(boolean is_human) { 
this.is_human = is_human; 
} 

public String getString() { 
return string; 
} 

public void setString(String string) { 
this.string = string; 
} 

} 

2.编写输入流处理工具类StreamTools。 

package com.shao.utils; 

import java.io.ByteArrayOutputStream; 
import java.io.InputStream; 

public class StreamTools { 
public static byte[] readInputStream(InputStream instream) throws Exception{ 
  ByteArrayOutputStream outstream = new ByteArrayOutputStream(); 
  byte[] buf = new byte[1024]; 
  int len = 0 ; 
  while(( len = instream.read(buf)) != -1) 
  { 
   outstream.write(buf, 0, len); 
  } 
  byte[] data = outstream.toByteArray();//网页的二进制数据 
  outstream.close(); 
  instream.close(); 
  return data; 
  
} 

} 

3.编写android布局文件main.xml。 

 
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
> 
    android:id="@+id/name"
android:layout_width="100dip"
android:layout_height="wrap_content"
/> 

android:id="@+id/listview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/> 
 

新建布局文件item.xml。 

 
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
> 
    android:id="@+id/name"
android:layout_width="100dip"
android:layout_height="wrap_content"
/> 
  android:id="@+id/sex"
android:layout_width="100dip"
android:layout_height="wrap_content"
/> 

  android:id="@+id/age"
android:layout_width="100dip"
android:layout_height="wrap_content"
/> 
  android:id="@+id/height"
android:layout_width="100dip"
android:layout_height="wrap_content"
/> 
  android:id="@+id/is_human"
android:layout_width="100dip"
android:layout_height="wrap_content"
/> 
  android:id="@+id/string"
android:layout_width="100dip"
android:layout_height="wrap_content"
/> 

 

在string.xml添加如下一行： 

net error 

4.编写业务实现类。 

package com.shao; 

import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.util.ArrayList; 
import java.util.List; 

import org.json.JSONArray; 
import org.json.JSONObject; 

import com.domain.Contact; 
import com.shao.utils.StreamTools; 

public class MyService { 

public static List getLastContact() throws Throwable 
{ 
  String path = "http://192.168.1.100:8080/WebContent/testjson/jsondata.php"; 
  List contacts = new ArrayList(); 
  URL url = new URL(path); 
  HttpURLConnection conn = (HttpURLConnection)url.openConnection(); 
  conn.setConnectTimeout(5*1000); 
  conn.setRequestMethod("GET"); 
  InputStream instream = conn.getInputStream(); 
  byte[] data = StreamTools.readInputStream(instream); 
  String json = new String(data); 
  JSONArray array = new JSONArray(json); 
  for(int i=0;i  { 
   JSONObject item = array.getJSONObject(i); 
   Contact contact = new Contact(item.getString("name"),item.getInt("age"),item.getInt("sex"),item.getDouble("height"),item.getBoolean("is_human"),item.getString("string"));
   contacts.add(contact); 
  } 
  
  return contacts; 
} 


} 

5.编写主Activity类。 

package com.shao; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

import com.domain.Contact; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.Toast; 

public class TestXML extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        try { 
   List contacts = MyService.getLastContact(); 
   List> data = new ArrayList>(); 
   
   ListView  listview = (ListView)findViewById(R.id.listview); 
   for(Contact contact : contacts) 
   { 
    HashMap item = new HashMap(); 
    item.put("name", contact.getName()); 
    item.put("sex",contact.getSex()); 
    item.put("age", contact.getAge()); 
    item.put("height", contact.getHeight()); 
    item.put("is_human", contact.isIs_human()); 
    item.put("string", contact.getString()); 
    data.add(item); 
    
   } 
   
   
   
   
   
   SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item, 
     new String[]{"name","sex","age","height","is_human","string"}, 
     new int[]{R.id.name, R.id.sex, R.id.age, R.id.height, R.id.is_human, R.id.string}); 
   
   listview.setAdapter(adapter); 
   
   
   
  } catch (Throwable e) { 
   Log.e("shao",e.toString()); 
   Toast.makeText(this, R.string.error, 1).show(); 
  } 
    } 
} 



6.开启访问网络功能 。 

 

步骤三 测试。