Kotlin語言篇：

1、抽象類的定義

 1 abstract class Person(var name : String, var age : Int) : Any() {
 2 
 3     abstract var addr : String
 4     abstract val weight : Float
 5 
 6     abstract fun doSwim()
 7 
 8     fun doFly() {
 9         println("doFly")
10     }
11 
12     fun doEach() {
13         println("doEach")
 
14     }
15 }

2、去掉標題欄

 1     <application
 2         android:allowBackup="true"
 3         android:icon="@mipmap/ic_launcher"
 4         android:label="@string/app_name"
 5         android:roundIcon="@mipmap/ic_launcher_round"
 6         android:supportsRtl="true"
 7         android:theme="@style/Theme.AppCompat.Light.NoActionBar"
 
>
 8         <activity android:name=".activity.SplashActivity">
 9             <intent-filter>
10                 <action android:name="android.intent.action.MAIN" />
11 
12                 <category android:name="android.intent.category.LAUNCHER" />
13             </intent-filter
 
>
14         </activity>
15     </application>

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