Android开发基础：怎么创建启动界面Splash Screen

启动界面Splash Screen在应用程序是很常用的，往往在启动界面中显示产品Logo、公司Logo或者开发者信息，如果应用程序启动时间比较长，那么启动界面就是一个很好的东西，可以让用户耐心等待这段枯燥的时间。

Android 应用程序创建一个启动界面Splash Screen非常简单。比如创建一个工程MySample，主Acitity就叫MySample，创建另一个Activity叫 SplashScreen，用于显示启动界面，资源文件为splash.xml。至于如何制作SplashSceen界面，这不是本文章要讨论的东西，就 此略过。

SplashScreen的代码如下：
package com.ctoof.android;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.MotionEvent;

public class SplashScreen extends Activity {
??? protected boolean _active = true;
??? protected int _splashTime = 5000;
???
??? @Override
??? public void onCreate(Bundle savedInstanceState) {
??????? super.onCreate(savedInstanceState);
??????? setContentView(R.layout.splash);
???????
??????? Thread splashTread = new Thread() {
??????????? @Override
??????????? public void run() {
??????????????? try {
??????????????????? int waited = 0;
??????????????????? while(_active && (waited < _splashTime)) {
??????????????????????? sleep(100);
??????????????????????? if(_active) {
??????????????????????????? waited += 100;
??????????????????????? }
??????????????????? }
??????????????? } catch(InterruptedException e) {
??????????????????? // do nothing
??????????????? } finally {
??????????????????? finish();
??????????????????? // 启动主应用
??????????????????? startActivity(new Intent("com.ctoof.android.MySample.MyApp"));
??????????????????? stop();
??????????????? }
??????????? }
??????? };
??????? splashTread.start();
??? }
???
??? @Override
??? public boolean onTouchEvent(MotionEvent event) {
??????? if (event.getAction() == MotionEvent.ACTION_DOWN) {
??????????? _active = false;
??????? }
??????? return true;
??? }
}
然后在AndroidMainfest.xml中修改代码如下：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
????? package="com.ctoof.android"
????? android:versionCode="1"
????? android:versionName="1.0">
??? <application android:icon="@drawable/icon" android:label="@string/app_name">
??????? <activity android:name=".SplashScreen"
????????????????? 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=".MyApp">
??????????? <intent-filter>
??????????????? <action android:name=" com.ctoof.android. MySample.MyApp " />
??????????????? <category android:name="android.intent.category.DEFAULT" />
??????????? </intent-filter>
??????? </activity>
??? </application>
??? <uses-sdk android:minSdkVersion="4" />
</manifest>

在这里负责注册两个活动。把负责管理启动界面Splash Screen的活动Activity作为应用程序的主活动，然后在SplashScreen中负责启动MyApp。