Android erhält JSON-Daten

Schritt 1: Die Seite gibt JSON-Daten zurück.

Nehmen Sie einige einfache Änderungen am json.php-Code dieses Space-Blogs „Einfache Implementierung von PHP und AJAX“ vor. Der Code lautet wie folgt: echo den Code echo $_GET['jsoncallback'].'(' .custom_json::encode( $big_test).')';

Ändern Sie die Datei in echo $_GET['jsoncallback'].custom_json::encode($big_test); jsondata.php.

Schritt 2: Android-Code schreiben.

1. Schreiben Sie die Contact-Klasse und legen Sie die Set- und Get-Methoden fest.

Paket com.domain;
private String name;
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.sex = sex;
this.is_human = is_human ;
this.string = string;
}
public String getName() {
return name; this.name = name;
}

public int getAge() {
return age; .age = age;
}

public int getSex() {
return sex; this. sex = sex;

public Double getHeight() {
return height; .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. Schreiben Sie die Eingabestream-Verarbeitungstoolklasse StreamTools.

package com.shao.utils;

import java.io.ByteArrayOutputStream;

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); () ;//Binärdaten der Webseite
outstream.close();
instream.close();
Rückgabedaten

}

3. Schreiben Sie die Android-Layoutdatei 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"
/>


Neues Layoutdateielement .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; 
java.net.URL importieren; 
import java.util.ArrayList; 
java.util.List importieren; 

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

com.domain.Contact importieren; 
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"; 
  Liste Kontakte = new ArrayList(); 
  URL url = neue URL(Pfad); 
  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); 
   Kontakt 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); 
  } 
  
 Kontakte zurückgeben; 
} 


} 

5.编写主Aktivität类。 

Paket com.shao; 

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

com.domain.Contact importieren; 

android.app.Activity importieren; 
android.os.Bundle importieren; 
import android.util.Log; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.Toast;         setContentView(R.layout.main); 
        versuchen Sie es mit { 
   List Kontakte = MyService.getLastContact(); 
   List> data = new ArrayList>(); 
   
   ListView  listview = (ListView)findViewById(R.id.listview); 
   for(Kontaktkontakt: Kontakte) 
   { 
    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。