1、Json的制作
package com.example.usingjson2; import org.json.JSONException; import org.json.JSONObject; import android.os.Bundle; import android.app.Activity; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); System.out.println("\"Hello World\""); JSONObject object = new JSONObject(); try { object.put("one", "yu"); object.put("two", "xi"); object.put("three", "kuo"); object.put("four", "hi"); System.out.println(object); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
2、Json的使用
(1)首先在当前包中创建新的class
package com.example.useingjson;public class Data { public static final String jsonStr = "{'arr':[1,2,3,4],'dat':[yu,xi,kuo]}"; }
(2)在Activity中调用
package com.example.useingjson;import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject;
import android.os.Bundle; import android.app.Activity;
public class MainActivity extends Activity {
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); System.out.println(Data.jsonStr); try { JSONObject jsonObject = new JSONObject(Data.jsonStr); JSONArray jsonArray = jsonObject.getJSONArray("arr"); System.out.println(jsonArray); for(int i = 0; i < jsonArray.length(); i++) { System.out.println(jsonArray.get(i)); } JSONArray jsonArray2 = jsonObject.getJSONArray("dat"); System.out.println(jsonArray2); for(int j = 0; j < jsonArray2.length(); j++) { System.out.println(jsonArray2.get(j)); } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
3、注意
Json的制作与使用分别是两个项目,由于刚接触Android,代码比较简单,重在理解原理。