Android App中读取XML与JSON格式数据的基本方法示例

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
<customer name="luopeng" age="21" gender="1"   emial="dylankeepmoving@163.com"/> 
<customer name="dylan" age="22" gender="2" emial="710097663@qq.com"/> 
<customer name="android" age="6" gender="2" emial="android@gmail.com"/> 
</resources>

public class TestXmlResourceParserActivity extends Activity { 
private EditText et; 
private Button myButton; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 

  // 变量在内部类中使用的前提是此变量必须是final修饰的 
  myButton = (Button) this.findViewById(R.id.btn01); 
  et = (EditText) this.findViewById(R.id.edittext01); 
  myButton.setOnClickListener(new OnClickListener() { 
    StringBuilder sb = new StringBuilder(""); 
    Resources res = getResources(); 
    XmlResourceParser xrp = res.getXml(R.xml.test); 

    @Override 
    public void onClick(View v) { 
      int counter = 0; 
      try { 
        // 判断是否到了文件的结尾 
        while (xrp.getEventType() != XmlResourceParser.END_DOCUMENT) { 
          //文件的内容的起始标签开始，注意这里的起始标签是test.xml文件里面<resources>标签下面的第一个标签 
          if (xrp.getEventType() == XmlResourceParser.START_TAG) { 
            String tagname = xrp.getName(); 
            if (tagname.endsWith("customer")) { 
              counter++; 
              sb.append("这是第" + counter + "客户"+"\n"); 
              sb.append("姓名："+xrp.getAttributeValue(0)+"\n"); 
              sb.append("年龄："+xrp.getAttributeValue(1)+"\n"); 
              sb.append("性别："+xrp.getAttributeValue(2)+"\n"); 
              sb.append("邮箱："+xrp.getAttributeValue(3)+"\n\n"); 
            } 
          } 
          xrp.next(); 
        } 
        et.setText(sb.toString()); 
      } catch (XmlPullParserException e) { 
      } catch (IOException e) { 
        e.printStackTrace(); 
      } 
    } 
  }); 
}

try {
    //首先创建对象中的一个单个键值对
    JSONObject root = new JSONObject();
    root.put("cat", "it");
    //另一个键值对的值是一个数组，数组里装了3个JSON对象，所以再分别搞3个JSONObject对象存放键值对
    JSONObject lan1 = new JSONObject();
    lan1.put("id", "1");
    lan1.put("ide", "Eclipse");
    lan1.put("name","Java");
    JSONObject lan2 = new JSONObject();
    lan2.put("id", "2");
    lan2.put("ide", "XCode");
    lan2.put("name","Swift");
    JSONObject lan3 = new JSONObject();
    lan3.put("id", "2");
    lan3.put("ide", "Visual Studio");
    lan3.put("name","C#");
    //在将这3个对象存入一个数组
    JSONArray array = new JSONArray();
    array.put(lan1);
    array.put(lan2);
    array.put(lan3);
    //再将数组作为键"languages"的值，构成一个对象
    root.put("languages", array);
    //本例中只将内容输出出来
    System.out.println(root.toString());

  } catch (JSONException e) {
    e.printStackTrace();
  }

{
  "languages":[
    {"id":1,"ide":"Eclipse","name":"Java"},
    {"id":2,"ide":"XCode","name":"Swift"},
    {"id":3,"ide":"Visual Studio","name":"C#"},
  ],
  "cat","it"
}
try {
    InputStream is = getResources().getAssets().open("test.json");
    InputStreamReader isr = new InputStreamReader(is, "UTF-8");
    BufferedReader br = new BufferedReader(isr);
    //将文本中的数据，都读取到一个StringBuilder当中
    String line;
    StringBuilder builder = new StringBuilder();
    while((line=br.readLine()) != null ){
      builder.append(line);
    }
    br.close();
    isr.close();

    JSONObject root = new JSONObject(builder.toString());
    //根据键，获得键对应的值，由于值是String类型，所以用getString
    System.out.println("cat="+root.getString("cat"));
    //根据键，获得键对应的数组，由于值是一个数组，所以用getJSONArray
    JSONArray array = root.getJSONArray("languages");
    //由于要遍历数组，所以创建一个for循环
    for(int i=0; i < array. length(); i++){
      //由于每一个数组当中的元素，也是一个新的JSON对象
      JSONObject lan = array.getJSONObject(i);
      System.out.println("-------------------");
      System.out.println("id="+lan.getInt("id"));
      System.out.println("ide="+lan.getString("name"));
      System.out.println("name="+lan.getString("name"));
      Log.i("tag","-------");
    }

  } catch (IOException e) {
    e.printStackTrace();
  } catch (JSONException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }