在 Activity 之间传递参数————传递值对象

 传递值对象：第一个中方式 ：传递的Uuser类，user需要

public class User implements Serializable

FirstMainActivity：

package com.example.parameter;

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


public class FirstMainActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first_main);
Button button1=(Button) findViewById(R.id.button1);
   button1.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
Intent intent=new Intent(FirstMainActivity.this,SecondMainActivity.class);
//user实现Serializable
intent.putExtra("user", new User("极客学院",20));
startActivity(intent);
}
});

}

SecondMainActivity ：

package com.example.parameter;
import android.R.integer;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;


public class SecondMainActivity extends Activity {
private TextView textView1;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second_main);
Intent intent=getIntent();
textView1=(TextView) findViewById(R.id.textView1);
User user=(User) intent.getSerializableExtra("user");
textView1.setText(String.format("name=%s,age=%d",user.getName(),user.getAge()));
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second_main, menu);
return true;
}
}

第二种方式：public class User implements Parcelable

package com.example.parameter;


import java.io.Serializable;


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


public class User implements Parcelable{
private String name;
private int age;
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 User(String name, int age) {
super();
this.name = name;
this.age = age;
}
public User() {
super();
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
//Parcelable没用全自动的序列化机制
dest.writeString(getName());
dest.writeInt(getAge());
}
public static final Creator<User>CREATOR=new Creator<User>() {

@Override
public User[] newArray(int size) {
return new User[size];
}

@Override
public User createFromParcel(Parcel source) {
return new User(source.readString(),source.readInt());
}
};
}

SecondMainActivity：

package com.example.parameter;


import android.R.integer;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;


public class SecondMainActivity extends Activity {
private TextView textView1;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second_main);
Intent intent=getIntent();
textView1=(TextView) findViewById(R.id.textView1);
User user=(User) intent.getParcelableExtra("user");
textView1.setText(String.format("name=%s,age=%d",user.getName(),user.getAge()));
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second_main, menu);
return true;
}


}