android 在activity之间传递复杂数据类型

在Activity传送复杂数据时，（这里用ArrayList<T>）为例，可以使用Serializable序列化或者Parcelable序列化来操作。

首先建立两个javabean，一个实现Serializable接口，一个实现Parcelable接口：

package org.example.passdata;

import java.io.Serializable;

public class Student implements Serializable {

private static final long serialVersionUID = 6130446011020753806L;

private String id;

private String name;

public Student(String id, String name) {
this.id = id;
this.name = name;
}

public String getId() {
return this.id;
}

public void setId(String id) {
this.id = id;
}

public String getName() {
return this.name;
}

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

@Override
public String toString() {
return "id:" + this.id + " name:" + this.name;
}
}

package org.example.passdata;

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

public class Teacher implements Parcelable {

private String id;

private String name;

public Teacher(String id, String name) {
this.id = id;
this.name = name;
}

public String getId() {
return this.id;
}

public void setId(String id) {
this.id = id;
}

public String getName() {
return this.name;
}

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

@Override
public int describeContents() {
return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(id);
dest.writeString(name);
}

@Override
public String toString() {
return "id:" + this.id + " name:" + this.name;
}

public static final Parcelable.Creator<Teacher> CREATOR = new Parcelable.Creator<Teacher>() {

@Override
public Teacher createFromParcel(Parcel source) {
Teacher teacher = new Teacher(source.readString(), source.readString());
return teacher;
}

@Override
public Teacher[] newArray(int size) {
return null;
}
};

}

然后在MainActrivity中发送数据：

package org.example.passdata;

import java.util.ArrayList;

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

public class PassDataActivity extends Activity implements OnClickListener {

private Button normalBtn, serializableBtn, parcelBtn;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

normalBtn = (Button) findViewById(R.id.normalbtn);
serializableBtn = (Button) findViewById(R.id.serializablebtn);
parcelBtn = (Button) findViewById(R.id.parcelbtn);

normalBtn.setOnClickListener(this);
serializableBtn.setOnClickListener(this);
parcelBtn.setOnClickListener(this);
}

@Override
public void onClick(View v) {
if (v.getId() == normalBtn.getId()) {
// 普通传送
} else if (v.getId() == serializableBtn.getId()) {
// Serializable序列化传送
ArrayList<Student> list = new ArrayList<Student>();
Student student = new Student("001", "naki");
list.add(student);
Intent intent = new Intent(this, SecondActivity.class);
intent.putExtra("STUDENT_INFO", list);
startActivity(intent);
} else if (v.getId() == parcelBtn.getId()) {
// parcel序列化传送
ArrayList<Teacher> list = new ArrayList<Teacher>();
Teacher teacher1 = new Teacher("001", "techaer1");
list.add(teacher1);
Intent intent = new Intent(this, SecondActivity.class);
intent.putExtra("TEACHER_INFO", list);
startActivity(intent);
}

}

}

在接收的Activity中接收数据：

package org.example.passdata;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

Intent intent = getIntent();
// serializable
// ArrayList<Student> list = (ArrayList<Student>) intent.getSerializableExtra("STUDENT_INFO");
// TextView textView = new TextView(this);
// textView.setText(list.get(0).toString());
// setContentView(textView);

// parcelble
ArrayList<Teacher> list = intent.getParcelableArrayListExtra("TEACHER_INFO");
TextView textView = new TextView(this);
textView.setText(list.get(0).toString());
setContentView(textView);
}
}

主页面三个按钮：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:id="@+id/normalbtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="普通传送" />

<Button
android:id="@+id/serializablebtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="serialized传送" />

<Button
android:id="@+id/parcelbtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="parcel传送" />

</LinearLayout>