在一個activity中，頂部和底部的兩個控制元件以動畫的形式相對出現，類似上下交錯的效果。首先自定義兩個佈局，繼承LinearLayout；其次在Activity需要載入佈局檔案中引用自定義佈局，並且在該佈局新增其他需要使用的元件，比如編輯框，文字框等。在自定義的佈局中定義一個方法，從上往下移動和從下網上移動。使用TranslateAnimation類，實現元件移動。這樣我們定義的佈局就具有了動畫的特徵，那麼在Activity載入Activiy對應的XML檔案時，首先要例項化自定義的佈局檔案，在呈現的時候，動畫效果也就隨之出現了。

請看程式碼；

三個java檔案，一個是自定義頂部佈局的java檔案，一個是自定義底部佈局的java檔案，他們都有一個動畫的方法；另一個是Activity。

頂部自定義佈局：

package com.king.helloword;

import android.annotation.SuppressLint;
import android.app.ActionBar.LayoutParams;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Typeface;
import android.graphics.drawable.GradientDrawable.Orientation;
import android.text.InputType;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

public class TopActivty extends LinearLayout{
	private Context context;

	public TopActivty(Context context) {
		super(context);
		topAnimation();
		// TODO Auto-generated constructor stub
	}
	public TopActivty(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.context=context;
		//addViewIn();
		setOrientation(LinearLayout.VERTICAL);
		topAnimation();
		
	}	
	private void topAnimation() {
		TranslateAnimation ta = new TranslateAnimation(0, 0, -200, 0);
		ta.setDuration(3000);
		this.setAnimation(ta);
	}

}
 

package com.king.helloword;

import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.view.Display;
import android.view.View;
import android.view.animation.TranslateAnimation;
import android.widget.LinearLayout;

public class BottomActivity extends LinearLayout{

	private Context context;
	public BottomActivity(Context context) {
		super(context);
		this.context=context;
		bottomAnimation();
		// TODO Auto-generated constructor stub
	}
	public BottomActivity(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.context=context;
		setOrientation(LinearLayout.VERTICAL);
		bottomAnimation();
		// TODO Auto-generated constructor stub
	}
	
	private void bottomAnimation() {
		
		Display d = ((Activity)context).getWindowManager().getDefaultDisplay();
		@SuppressWarnings("deprecation")
		int height = d.getHeight();
		TranslateAnimation ta = new TranslateAnimation(0, 0, 350, 0);
		ta.setDuration(3000);
		this.setAnimation(ta);
	}
}
 

package com.king.helloword;

import android.app.Activity;
import android.os.Bundle;
import android.view.Display;
import android.view.Window;

public class DefinedActivtiyAnimation extends Activity{
	private int height;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.defined_animation);
		
	}
}

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

    <com.king.helloword.TopActivty
        android:id="@+id/top_view"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_alignParentTop="true"
        android:background="#4ff" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="100dp"
            android:layout_marginTop="26dp"
            android:text="TextView" />

        <EditText
            android:id="@+id/editText1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_below="@+id/textView1"
            android:layout_marginLeft="74dp"
            android:layout_marginTop="22dp"
            android:ems="10"
            android:inputType="textPassword" >

            <requestFocus />
        </EditText>
    </com.king.helloword.TopActivty>

    <com.king.helloword.BottomActivity
        android:id="@+id/bottom_view"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:layout_alignParentBottom="true"
        android:background="#4ff" >

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_below="@+id/top_view"
            android:layout_marginLeft="61dp"
            android:layout_marginTop="62dp"
            android:text="Button" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/button1"
            android:layout_below="@+id/button1"
            android:layout_marginTop="36dp"
            android:text="Button" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/button2"
            android:layout_below="@+id/button2"
            android:text="Button" />
    </com.king.helloword.BottomActivity>

</RelativeLayout>