一、引用
1、Android Activity间传值选择，Serializable Or Parcelable
2、Android开发艺术探索 第2章 IPC机制 读书笔记
3、Andriod Parcelable 读写 boolean（布尔值）的步骤
二、实例
1、活动一：FirstActivity传递数据，用Intent或者用Bundle，按照key-value键值对来存放待传递数据
FirstActivity.class
1.1、传递基本类型数据
1.2、传递自定义bean，实现Serializable接口
1.3、传递自定义ArrayList<bean>，实现Parcelable接口
1.4、数据传递：startActivity(intent);单纯传递数据startActivityForResult(intent,requestCode);传递数据+数据返回的code设置
1.5、onActivityResult复写用来接受回传的数据，判断resultCode和requestCode来获取数据
/**
* 传递数据
* 1、基本类型和基本类型list
* 2、各种bean类
* 3、各种list<bean>
* */
public void sendData(View v){
//cars
ArrayList<String> cars = new ArrayList<>();
cars.add("法拉利");
cars.add("奔驰");
cars.add("宾利");
//girl friend
GirlFriend girlFriend = new GirlFriend("小丽",21,"C",165,45);
//cards
Card card_0 = new Card("工商银行",200,true);
Card card_1 = new Card("建设银行",456,false);
ArrayList<Card> cards = new ArrayList<>();
cards.add(card_0);
cards.add(card_1);
Intent it = new Intent(this,SecondActivity.class);
//基本类型和基本类型array举例--用Bundle一样的
it.putExtra("name","帅哥");
it.putExtra("age",23);
it.putStringArrayListExtra("cars",cars); //String类型数组
it.putExtra("girlfriend",girlFriend);
it.putExtra("cards",cards);
this.startActivityForResult(it,1001);
}
/**
* 数据回传：
*
* resultCode：是否有回传的标识
* Activity.RESULT_OK = -1
* Activity.RESULT_CANCELED = 0
*
* requestCode：具体回传的code标识
* */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//super.onActivityResult(requestCode, resultCode, data);
if (resultCode != Activity.RESULT_OK)
return;
switch (requestCode){
case 1001:
String result = data.getExtras().getString("result");
LogUtil.i("从活动二回传过来的数据："+result);
tvResult.setText(result);
break;
}
}
GirlFriend.class
1、实现Serializable接口，并加long serialVersionUID = 1L;
2、静态成员或者方法、transient关键字的并不参加序列化
3、已经默认实现了Parcelable的writeObject和readObject的方法，用Serializable接口是因为这个写法比较简单...
public class GirlFriend implements Serializable{
private static final long serialVersionUID = 1L;
private String name;
private int age;
private String cup;
private int height;
private int weight;
public GirlFriend(String name,int age,String cup,int height,int weight){
this.name = name;
this.age = age;
this.cup = cup;
this.height = height;
this.weight = weight;
}
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;
}
public String getCup() {
return cup;
}
public void setCup(String cup) {
this.cup = cup;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
@Override
public String toString() {
return "女友信息 {" +
"姓名='" + name + '\'' +
", 年龄=" + age +
", 罩杯='" + cup + '\'' +
", 身高=" + height +
", 体重=" + weight +
'}';
}
}
Card.class
1、实现Parcelable接口，写法略微复杂但是可以实现传递ArrayList，但是速度更快
2、实现writeObject和readObject接口
3、注意boolean值的read和write
read : exist = in.readByte()!=0; //boolean的读
write : parcel.writeByte((byte)(exist ?1:0)); //boolean的写
public class Card implements Parcelable{
private String bank;
private int money;
private boolean exist;
public Card(String bank,int money,boolean exist){
this.bank = bank;
this.money = money;
this.exist = exist;
}
public String getBank() {
return bank;
}
public void setBank(String bank) {
this.bank = bank;
}
public int getMoney() {
return money;
}
public void setMoney(int money) {
this.money = money;
}
public boolean isExist() {
return exist;
}
public void setExist(boolean exist) {
this.exist = exist;
}
//============================================================
public static final Creator<Card> CREATOR = new Creator<Card>() {
@Override
public Card createFromParcel(Parcel in) {
return new Card(in);
}
@Override
public Card[] newArray(int size) {
return new Card[size];
}
};
/**
* 对应Creator中的构造器
* */
protected Card(Parcel in) {
bank = in.readString();
money = in.readInt();
exist = in.readByte()!=0; //boolean的读
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int i) {
parcel.writeString(bank);
parcel.writeInt(money);
parcel.writeByte((byte)(exist ?1:0)); //boolean的写
}
}
2、活动二：SecondActivity接受FirstActivity数据，getIntent获取意图，用key-value键值对形式获取数据
SecondActivity.class
1、获取数据：getIntent().getExtras().getXXX();
2、返回数据：setResult(resultCode , Data); resultCode=Activity.RESULT_OK 当然也可以随便设置，不一定非用这个参数，只要和接受地方一致就行了
private void getInfo(){
Intent it = getIntent();
if(it != null){
Bundle bd = it.getExtras();
String name = bd.getString("name");
int age = bd.getInt("age");
ArrayList<String> cars = bd.getStringArrayList("cars");
GirlFriend friend = (GirlFriend) bd.getSerializable("girlfriend");
ArrayList<Card> cards = bd.getParcelableArrayList("cards");
StringBuilder sb = new StringBuilder();
sb.append("姓名="+name+"，年龄="+age+"\n车子：");
for (String car : cars){
sb.append(car+"、");
}
sb.append(friend.toString()+"\n");
sb.append("\n银行卡：\n");
for(Card card : cards){
sb.append("开户行="+card.getBank()+",存款="+card.getMoney()+",是否拥有="+card.isExist()+"\n");
}
LogUtil.i("从活动一传过来的数据："+sb.toString());
tvResult.setText(sb.toString());
}
}
/**
* 返回数据到前一个activity
* */
public void returnData(View v){
Intent it = new Intent();
it.putExtra("result","活动二结果...");
setResult(Activity.RESULT_OK,it);
finish();
}
3、结果图
1.png
2.png
back1.png
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