ANDROID_MARS学习笔记_S02_013_Gson解析json串

1.MainActivity.java

 package com.json;

 import java.io.IOException;
 import java.io.StringReader;

 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.os.Bundle;
 import android.util.JsonReader;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;

 public class MainActivity extends Activity {

     private String jsonData = "[{\"name\":\"Michael\",\"age\":20},{\"name\":\"Mike\",\"age\":21}]";
     private Button button ;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         button = (Button)findViewById(R.id.buttonId);
         button.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 JsonUtils jsonUtils = new JsonUtils();
                 jsonUtils.parseJson(jsonData);
             }
         });
     }

     class JsonUtils {
         @SuppressLint("NewApi")
         public void parseJson(String jsonData) {
             JsonReader reader = new JsonReader(new StringReader(jsonData));
             try {
                 reader.beginArray();//开始解析数组
                 while (reader.hasNext()) {
                     reader.beginObject();//开始解析对象
                     while (reader.hasNext()) {//开始解析键值对
                         String tagName = reader.nextName();
                         if(tagName.equals("name")) {
                             System.out.println("name-->" + reader.nextString());
                         }
                         else if(tagName.equals("age")) {
                             System.out.println("age--->" + reader.nextInt());
                         }
                     }
                     reader.endObject();
                 }
                 reader.endArray();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }
 }