android json相关-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_2164/article/details/82231180

本文介绍了一种在Android应用中实现对象与JSON格式数据互相转换的方法。通过定义接口和实体类，实现了AppInfo对象的序列化和反序列化过程，并在Activity中演示了对象到JSON及从JSON恢复对象的具体步骤。

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android 对象到json json到对象

接口类

package com.test.json;

import org.json.JSONException;
import org.json.JSONObject;

public interface JsonSerializable {

	abstract void deCode(JSONObject object) throws JSONException;
	
	abstract void enCode(JSONObject object) throws JSONException;
	
}

实体类

package com.test.json;

import java.io.Serializable;

import org.json.JSONException;
import org.json.JSONObject;

public class ItemInfo implements Serializable , JsonSerializable{
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	public int screen;

	public int cellX;
	
	public int cellY;
	
	public int mWidth;
	
	public int mHeight;
	
	public Object ObjectTag;

	public ItemInfo(){}
	
	public ItemInfo(int screen,int cellX, int cellY) {
		super();
		this.screen = screen;
		this.cellX = cellX;
		this.cellY = cellY;
	}

	public ItemInfo(int screen,int cellX, int cellY, int mWidth, int mHeight,
			Object objectTag) {
		super();
		this.screen = screen;
		this.cellX = cellX;
		this.cellY = cellY;
		this.mWidth = mWidth;
		this.mHeight = mHeight;
		ObjectTag = objectTag;
	}

	@Override
	public  void enCode(JSONObject object) throws JSONException {
		object.put("screen", screen);
		object.put("cellX", cellX);
		object.put("cellY", cellY);
	}

	@Override
	public void deCode(JSONObject object) throws JSONException {
		screen = object.getInt("screen");
		cellX = object.getInt("cellX");
		cellY = object.getInt("cellY");
	}

}

package com.test.json;

import org.json.JSONException;
import org.json.JSONObject;

import android.graphics.Bitmap;

public class AppInfo extends ItemInfo {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public Bitmap iconBitmap;

	public String title;

	public boolean isInstall = false;

	public boolean isUpdate = false;
	
	public AppInfo(){
		super();
	}

	public AppInfo(Bitmap iconBitmap, String title) {
		super();
		this.iconBitmap = iconBitmap;
		this.title = title;
	}

	public AppInfo(int screen, int cellX, int cellY, Bitmap iconBitmap,
			String title) {
		super(screen, cellX, cellY);
		this.iconBitmap = iconBitmap;
		this.title = title;
	}

	public boolean eqXY(AppInfo appInfo) {
		if (this.cellX == appInfo.cellX && this.cellY == appInfo.cellY)
			return true;
		return false;
	}

	@Override
	public void enCode(JSONObject object) throws JSONException {
		super.enCode(object);
		object.put("title", title);
		object.put("isInstall", isInstall);
		object.put("isUpdate", isUpdate);
	}

	@Override
	public void deCode(JSONObject object) throws JSONException {
		super.deCode(object);
		title = object.getString("title");
		isInstall = object.getBoolean("isInstall");
		isUpdate = object.getBoolean("isUpdate");
	}

	
	
}

activity

package com.test.json;

import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class JsonTestActivity extends Activity implements OnClickListener {
   
	private Button button;
	
	private AppInfo appInfo;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button = (Button) findViewById(R.id.button1);
        button.setOnClickListener(this);
        findViewById(R.id.button2).setOnClickListener(this);
        appInfo = new AppInfo(1, 1, 1, null, "1234");
    }

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.button1:
			objToJson();
			break;
		case R.id.button2:
			jsonToObj();
			break;
		default:
			break;
		}
		
	}
	
	private void objToJson(){
		JSONObject jsonObject = new JSONObject();
		try {
			appInfo.enCode(jsonObject);
			String data =  jsonObject.toString();
			getDataContainer().edit().putString("Appinfo",data).commit();
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	private void jsonToObj(){
		String jsonStr = getDataContainer().getString("Appinfo",null);
		if(null == jsonStr) return ;
		try {
			JSONObject object = (JSONObject) new JSONTokener(jsonStr).nextValue();
			appInfo = new AppInfo();
			appInfo.deCode(object);
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	private SharedPreferences getDataContainer(){
		return getSharedPreferences("JsonTestActivity", Context.MODE_WORLD_READABLE | Context.MODE_WORLD_WRITEABLE);
	}
}