开发过程中，Activity之间传递数据是必不可少的，android中使用Intent和Bundle作为数据载体，在Activity之间传递，对于基础数据类型，Bundle已经提供相关的put,get方法，而作为自定义的类型则需要有特别的要求.
自定义类型，想要使用Bundle传递时，需要满足特定条件。即该类型需要实现Serializable接口或者Parcelable接口
(注意：如果目标对象中包含其他对象，则被包含的对象也需要实现Serializable接口或者Parcelable接口)
(关于Serializable接口和Parcelable接口就不在此做记录了)
步骤:
1.定义类，实现相关接口
2.使用Intent和Bundle对应的方法set数据
3.startActivity传递Intent对象
使用Serializable
一.传递对象
a).定义类,实现Serializable接口
public class Student implements Serializable
{
// members
private String name; private String age; private int id; // getter setter
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public String getAge()
{
return age;
}
public void setAge(String age)
{
this.age = age;
} /**
* Serializable
*/
private static final long serialVersionUID = 1L;
}
Student
b).使用Intent传递对象
// 使用Serializable
Button btnSerializable = (Button)findViewById(R.id.btnSerializable);
btnSerializable.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub // create data
Student student = new Student();
student.setName("stephen lee");
student.setAge("12");
student.setId(1); // bundle
Bundle bundle = new Bundle();
bundle.putSerializable(MainActivity.StudentKey,student); // intent
Intent intent = new Intent(arg0.getContext(),SecondActivity.class);
intent.putExtras(bundle); // navigate
startActivity(intent);
}
});
使用Serializable
c).获取传递的数据
Bundle bundle = this.getIntent().getExtras();
Student student = (Student)bundle.getSerializable(MainActivity.StudentKey);
if(student!=null)
textView.setText("name:" + student.getName() + "age:" + student.getAge() + "id:" + student.getId());
SecondActivity
二.传递对象集合
a).同上
b).同上(注意使用putSerializable()方法时，需要把List<>强转成为Serializable,并且集合中的成员都需要实现Serializable接口)
Button btnSerializableList = (Button)findViewById(R.id.btnSerializableList);
btnSerializableList.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub // create data
List<Student> students = new ArrayList<Student>(); Student student1 = new Student();
student1.setName("hellenism");
student1.setAge("12");
student1.setId(1); Student student2 = new Student();
student2.setName("stephen lee");
student2.setAge("12");
student2.setId(2); students.add(student1);
students.add(student2); // bundle , 注意:使用putSerializable()方法时，需要把List<>强转成为Serializable,并且集合中的成员都需要实现Serializable接口
Bundle bundle = new Bundle();
bundle.putSerializable(MainActivity.StudentsKey,(Serializable)students); // intent
Intent intent = new Intent(v.getContext(),SecondActivity.class);
intent.putExtras(bundle); // navigate
startActivity(intent);
}
});
使用Serializable
c).同上(不足之处在于，由于获取数据时候，需要把Serializable强转成为对应的List<>，此处会有警告)
Bundle bundle = this.getIntent().getExtras();
List<Student> students = (List<Student>)bundle.getSerializable(MainActivity.StudentsKey);
if(students!=null)
textView.setText("name:" + students.get(1).getName() + "age:" + students.get(1).getAge() + "id:" + students.get(1).getId());
SecondActivity
使用Parcelable
一.传递对象
a).定义类,实现Parcelable接口
public class Person implements Parcelable
{
// members
private String name;
private String age;
private int id; // getter setter
public int getId()
{
return id;
} public void setId(int id)
{
this.id = id;
} public String getName()
{
return name;
} public void setName(String name)
{
this.name = name;
} public String getAge()
{
return age;
} public void setAge(String age)
{
this.age = age;
} // Parcelable
@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.writeString(age);
dest.writeInt(id);
} public static final Parcelable.Creator<Person> CREATOR = new Creator<Person>() {
public Person createFromParcel(Parcel source) {
Person person = new Person();
person.age = source.readString();
person.name = source.readString();
person.id = source.readInt();
return person;
} public Person[] newArray(int size) {
return new Person[size];
}
};
}
Parcelable接口
b).使用Intent传递参数
// 使用Parcelable
Button btnParcelable = (Button)findViewById(R.id.btnParcelable);
btnParcelable.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub // create data
Person person = new Person();
person.setName("i am person");
person.setAge("12");
person.setId(1); // bundle
Bundle bundle = new Bundle();
bundle.putParcelable(MainActivity.PersonKey,person); // intent
Intent intent = new Intent(arg0.getContext(),SecondActivity.class);
intent.putExtras(bundle); // navigate
startActivity(intent);
}
});
使用Intent
c).获取传递的参数
Bundle bundle = this.getIntent().getExtras();
Person person = (Person)bundle.getParcelable(MainActivity.PersonKey);
if(person!=null)
textView.setText("name:" + person.getName() + "age:" + person.getAge() + "id:" + person.getId());
获取传递的参数
二.传递数据类型
a).同上
b).同上
Button btnParcelableList = (Button)findViewById(R.id.btnParcelableList);
btnParcelableList.setOnClickListener(new View.OnClickListener()
{ @Override
public void onClick(View v)
{
// TODO Auto-generated method stub // create data
List<Person> persons = new ArrayList<Person>(); Person person1 = new Person();
person1.setAge("12");
person1.setName("stephen lee");
person1.setId(1); Person person2 = new Person();
person2.setAge("12");
person2.setName("hellenism");
person2.setId(2); persons.add(person1);
persons.add(person2); // bundle
Bundle bundle = new Bundle();
bundle.putParcelableArrayList(MainActivity.PersonsKey, (ArrayList<? extends Parcelable>) persons); // intent
Intent intent = new Intent(v.getContext(),SecondActivity.class);
intent.putExtras(bundle); // navigate
startActivity(intent);
}
});
使用Intent传递参数
c).同上
Bundle bundle = this.getIntent().getExtras();
List<Person> persons = bundle.getParcelableArrayList(MainActivity.PersonsKey);
if(persons!=null)
textView.setText("name:" + persons.get(1).getName() + "age:" + persons.get(1).getAge() + "id:" + persons.get(1).getId());
获取参数
注意:
使用以上方法传递对象时，都是创建了新的实例，而非传递对象的引用，如果是传递引用，也就无需序列化了。
完整例子: