Java和Kotlin中的ViewStub用法

Java和Kotlin中的ViewStub用法区别

XML布局如下:

    
<LinearLayout           
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:orientation="vertical">

    <ViewStub
        android:id="@+id/viewStub"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout="@layout/viewstub_test"/>
        
</LinearLayout>

ViewStub viewstub_test的布局:

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:gravity="center_horizontal">
    
    <TextView
        android:id="@+id/tv_title"
        android:text="HelloWorld"
        android:textSize="36sp"
        android:textColor="#fff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

在Java中ViewStub的用法如下:

//需要先找到ViewStub
ViewStub vs = (ViewStub)findViewById(R.id.viewStub)
//或者直接设置Visiable   vs.setVisibility(View.VISIBLE);
LinearLayout layout = (LinearLayout)vs.inflate()
//找到ViewStub里面的view
TextView tv = layout.findViewById(R.id.tv_title)
tv.setText("你好~")

在Kotlin中ViewStub的用法如下:

//viewStub.inflate()
viewStub.visibility = View.VISIBLE
//不需要再次findViewById 可以直接调用
//TextView tv = layout.findViewById<TextView>(R.id.tv_title)
tv_title.text = "你好"