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

public class Activity01 extends Activity {
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);  /* 設定顯示main.xml佈局 */
        
      
        Button button = (Button)this.findViewById(R.id.button1);
        button.setOnClickListener(new Button.OnClickListener(){
        	public void onClick(View v){
        		//新建一個Intent
        		Intent intent = new Intent();
        		//制定intent要啟動的類
        		intent.setClass(Activity01.this, Activity02.class);
        		//啟動一個新的Activity
        		startActivity(intent);
        		//關閉當前的
        		Activity01.this.finish();
        		
        	}
        });
    }
    
    
}
 

Activity02

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

public class Activity02 extends Activity{			/*savedInstanceState 儲存當前Activity的狀態資訊。*/
	
	public void onCreate(Bundle savedInstanceState)   
	{	
		super.onCreate(savedInstanceState);			//呼叫父類的onCreate建構函式) 
													/* 設定顯示main2.xml佈局 */
		setContentView(R.layout.main2);
												 	/* findViewById(R.id.button2)取得佈局main.xml中的button2 */
		Button button = (Button) findViewById(R.id.button2);
													/* 監聽button的事件資訊 */
		button.setOnClickListener(new Button.OnClickListener(){
			public void onClick(View v){
													/* 新建一個Intent物件 */
				Intent intent = new Intent();
				/* 指定intent要啟動的類 */
				intent.setClass(Activity02.this, Activity01.class);
													/* 啟動一個新的Activity */
				startActivity(intent);
													/* 關閉當前的Activity */
				Activity02.this.finish();
			}
			
		});
	}
}
 

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">第一個Activity</string>
    <string name="hello2">第二個Activity</string>    
    <string name="app_name">Activity切換</string>

</resources>

main.xml

<?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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" 
    />
    <Button
        android:layout_width="100px"
        android:layout_height="wrap_content"
        android:layout_x = "120px"
        android:layout_y = "90px"
        android:text ="切換"
        android:id="@+id/button1"
        >
     </Button>   

</LinearLayout>
 

main2.xml

<?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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello2" 
    />
    <Button
        android:layout_width="100px"
        android:layout_height="wrap_content"
        android:layout_x = "120px"
        android:layout_y = "90px"
        android:text ="切換"
        android:id="@+id/button2"
        >
     </Button>   

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.lysine"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="7" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".Activity01"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <activity
            android:name="Activity02">
         </activity>
        
        
    </application>

</manifest>