<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".Main" >
 
  <Button
    android:id="@+id/btn"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="next" />
 
</RelativeLayout>

package com.app.main;
 
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 Main extends Activity {
 
  Button btn = null;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
 
    setContentView(R.layout.main);
 
    btn = (Button) this.findViewById(R.id.btn);
 
    btn.setOnClickListener(new OnClickListener() {
 
      @Override
      public void onClick(View arg0) {
 
        Intent intent = new Intent();
 
        Person p = new Person();
 
        p.setName("wx");
 
        p.setGender("boy");
 
        p.setAge(25);
 
        intent.putExtra("person", p);
 
        intent.setClass(Main.this, NextMain.class);
 
        Main.this.startActivity(intent);
         
         
       
      }
 
    });
 
  }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" >
 
  <TextView
    android:id="@+id/textview1"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
 
</LinearLayout>

package com.app.main;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
 
public class NextMain extends Activity {
 
  @Override
  public void onCreate(Bundle savedInstanceState) {
 
    super.onCreate(savedInstanceState);
 
    this.setContentView(R.layout.nextmain);
 
    TextView tv = (TextView) this.findViewById(R.id.textview1);
 
    Intent intent = this.getIntent();
 
    if (intent.getExtras().get("person") != null) {
 
      Person p = (Person) intent.getExtras().get("person");
 
      tv.setText("name:" + p.getName() + ",age:" + p.getAge()
          + ",gender:" + p.getGender());
 
    }
  }
}