1.刪除啟動介面的xml佈局，刪除setContentView。註釋掉Activity中這行程式碼

    setContentView(R.layout.activity_accessories_welcome);

      2.在res/drawable裡寫一個這種玩意：background_splash.xml，back_welcome就是背景圖片

  <?xml version="1.0" encoding="utf-8"?>
  <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
     <item>
        <bitmap android:src="@drawable/back_welcome"/>
    </item> 
  </layer-list>
 

    3.在style裡配置主題，@drawable/background_splash就是上面建立的xml檔案

    <style name="SplashTheme" parent="android:Theme.Light.NoTitleBar">
        <item name="android:windowBackground">@drawable/background_splash</item>
    </style>

    4.在manifest中啟動頁的Activity標籤中配置主題：   

        <activity
            android:name=".activity.Welcome_Activity"
            android:label="@string/app_name"
            android:theme="@style/SplashTheme" 
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    5.在啟動頁Activity的onCreate()中寫上延時2秒的啟動方法

	Handler handler = new Handler();
		handler.postDelayed(new Runnable() {
			public void run() {
				 Intent intent = new Intent(Welcome_Activity.this,
				 MainActivity.class);
				 startActivity(intent );
				 finish();
			}
		}, 2000);