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。 

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
    <textview 
android:id="@+id/name" 
  android:layout_width="100dip" 
    android:layout_height="wrap_content" 
/> 

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

新建布局文件item.xml。 

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
    <textview 
android:id="@+id/name" 
  android:layout_width="100dip" 
    android:layout_height="wrap_content" 
/> 
  <textview 
android:id="@+id/sex" 
  android:layout_width="100dip" 
    android:layout_height="wrap_content" 
/> 

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

</linearlayout> 

在string.xml添加如下一行： 

<string name="error">net error</string> 

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<contact> getlastcontact() throws throwable 
{ 
  string path = "http://192.168.1.100:8080/webcontent/testjson/jsondata.php"; 
  list<contact> contacts = new arraylist<contact>(); 
  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<array.length();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<contact> contacts = myservice.getlastcontact(); 
   list<hashmap<string,object>> data = new arraylist<hashmap<string,object>>(); 
   
   listview  listview = (listview)findviewbyid(r.id.listview); 
   for(contact contact : contacts) 
   { 
    hashmap<string,object> item = new hashmap<string,object>(); 
    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 。 

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

步骤三 测试。 

Find JSON Path Online

Easily find JSON paths within JSON objects using our intuitive Json Path Finder

30

查看详情