1：使用Intent（意圖）的方式實現Activity跳轉

(1)MainActivity.java:

public class MainActivity extends Activity {
	private Button startOther;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		startOther=(Button) findViewById(R.id.button);
		startOther.setOnClickListener(new StartListener());
	}

	class StartListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// 當點選事件觸發後執行，啟動OtherActivity
			//建立一個Intent物件
			Intent intent=new Intent();
			//呼叫setClass方法指定啟動某一個Activity
			intent.setClass(MainActivity.this, OtherActivity.class);
			//呼叫startActivity
			startActivity(intent);
			
		}
		
	}
}

(2)OtherActivity.java
//建立一個類繼承自Activity
public class OtherActivity extends Activity {
	
	@Override
	//重寫onCreate方法，當前Activity的入口
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_other);
	}
}

(3)activity_main.xml
<LinearLayout 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" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第一個Activity" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="啟動OtherActivity"/>

</LinearLayout>

(4)activity_other.xml
<?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:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="這是第二個Activity"/>

</LinearLayout>
 

2:BackStack回退棧（先進後出）