android中一种欢迎界面方式

在android应用中，在进入主界面之前经常会有一段用于过渡的欢迎界面，下面介绍一种，代码如下：

WelcomeActivity：

package com.home.welcompage;import java.util.Random;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.widget.ImageView;import android.widget.LinearLayout;public class WelcomeActivity extends Activity {	private ImageView welcomeImage;	private Thread t1, t2;	private Handler handler;	private int rand = new Random().nextInt(4);;	private Animation animation;	private int pageNumber = 1;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.welcome);		welcomeImage = (ImageView) findViewById(R.id.welcome_iv);		animation = AnimationUtils.loadAnimation(this, R.anim.scal_anim);		LinearLayout layout = (LinearLayout) findViewById(R.id.welcome_layout);		layout.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				if (pageNumber == 2) {					t1.interrupt();					t2.interrupt();					turnPage();// 跳转界面				}			}		});		handler = new Handler() {			@Override			public void handleMessage(Message msg) {				super.handleMessage(msg);				if (msg.what == 0) {					switch (rand) {					case 0:						// 设置动画背景						startAnimation(R.drawable.back1);						break;					case 1:						startAnimation(R.drawable.back2);						break;					case 2:						startAnimation(R.drawable.back3);						break;					case 3:						startAnimation(R.drawable.back4);						break;					default:						break;					}				}			}		};		t1 = new Thread(new Runnable() {			@Override			public void run() {				try {					Thread.sleep(3000);					handler.sendEmptyMessage(0);				} catch (InterruptedException e) {					e.printStackTrace();				}			}		});		t1.start();		t2 = new Thread(new Runnable() {			@Override			public void run() {				try {					Thread.sleep(4000);					turnPage();// 跳转界面				} catch (InterruptedException e) {					e.printStackTrace();				}			}		});	}	/**	 * 跳转到主界面	 */	private void turnPage() {		Intent intent = new Intent(WelcomeActivity.this, MainActivity.class);		WelcomeActivity.this.startActivity(intent);		WelcomeActivity.this.finish();	}	/**	 * 设置动画背景	 * 	 * @param imageSource	 */	private void startAnimation(int imageSource) {		welcomeImage.setBackgroundDrawable(getResources().getDrawable(				imageSource));		welcomeImage.setAnimation(animation);		welcomeImage.startAnimation(animation);		t2.start();		pageNumber = 2;	}}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:id="@+id/welcome_layout">    <ImageView        android:id="@+id/welcome_iv"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@drawable/logo"/></LinearLayout>

动画：scal_anim.xml：

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <scale        android:duration="6000"        android:fromXScale="1.0"        android:fromYScale="1.0"        android:pivotX="50%"        android:pivotY="50%"        android:toXScale="1.2"        android:toYScale="1.2" /></set>