【轉】Android中intent傳遞對象和Bundle的用法

原文網址：http://blog.csdn.net/lixiang0522/article/details/8642202

android中的組件間傳遞的對象一般實現Parcelable接口，當然也可以使用java的Serializable接口，前者是android專門設計的，效率更高，下面我們就來實現一個Parcelabel。

 

1. 創建一個類實現Parcelable接口，具體實現如下：

package com.hebaijun.testparcelable;

import android.os.Parcel;
import android.os.Parcelable;

public class ParcelableData implements Parcelable{
    private String name;
    private int age;

    public ParcelableData(){
        name = "guest";
        age = 20;
    }

    public ParcelableData(Parcel in){
        //順序要和writeToParcel寫的順序一樣
        name = in.readString();
        age = in.readInt();
    }

    public String getName(){
        return name;
    }

    public void setName(String name){
        this.name = name;
    }

    public int getAge(){
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public int describeContents() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        // TODO Auto-generated method stub
        dest.writeString(name);
        dest.writeInt(age);
    }

    public static final Parcelable.Creator<ParcelableData> CREATOR = new Parcelable.Creator<ParcelableData>() {
        public ParcelableData createFromParcel(Parcel in) {
            return new ParcelableData(in);
        }

        public ParcelableData[] newArray(int size) {
            return new ParcelableData[size];
        }
    };

}

2. 通過下面的方法發送對象。Bundle類也實現了Parcelable接口，一般在android中我們是通過Bundle來封裝數據並進行傳送的。

Intent intent = new Intent();
intent.setClass(this, SubActivity.class);
// 直接添加
//intent.putExtra("MyData", new ParcelableData());

// 通過Bundle
Bundle bundle = new Bundle();
bundle.putString("MyString", "test bundle");
bundle.putParcelable("MyData", new ParcelableData());
intent.putExtras(bundle);
startActivity(intent);

3. 下面的接收對象的方法。

//ParcelableData parcelableData = getIntent().getParcelableExtra("MyData");
Bundle bundle = getIntent().getExtras();
ParcelableData parcelableData = bundle.getParcelable("MyData");
String testBundleString = bundle.getString("MyString");
Log.v("string=", testBundleString);
Log.v("name=", parcelableData.getName());
Log.v("age=", ""+parcelableData.getAge());
Person mPerson = new Person();
        mPerson.setName("frankie");
        mPerson.setAge(25);
        Intent mIntent = new Intent(this,ObjectTranDemo1.class);
        Bundle mBundle = new Bundle();
        mBundle.putSerializable(SER_KEY,mPerson);
        mIntent.putExtras(mBundle);
Intent mIntent = new Intent(this,ObjectTranDemo2.class);
        Bundle mBundle = new Bundle();
        mBundle.putParcelable(PAR_KEY, mBook);
        mIntent.putExtras(mBundle);
        Book mBook = (Book)getIntent().getParcelableExtra(ObjectTranDemo.PAR_KEY);