Android学习笔记25

Android TV
首先要先在gradle中加入

implementation 'androidx.leanback:leanback:1.1.0-alpha05'
implementation 'androidx.leanback:leanback-tab:1.1.0-alpha05'

这样才能使用browsefragment
一开始先新增一个MainFragment然後继承browserfragment然後复写一onViewCreate
然後初始化页面，程序码如下

class MainFragment : BrowseSupportFragment() {
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        init()
        super.onViewCreated(view, savedInstanceState)
    }
    fun init(){
        val mRowsAdapter = ArrayObjectAdapter(ListRowPresenter())
        adapter = mRowsAdapter
        if(context!=null){
            //左侧 HeaderSupportFragment 的背景
            brandColor = ContextCompat.getColor(context!!, android.R.color.holo_blue_light)
            //右侧右上方 icon
            badgeDrawable = ContextCompat.getDrawable(context!!, android.R.drawable.ic_media_play)
        }
    }
}

然後activity_main.xml的code

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <fragment
        android:id="@+id/browse_fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:name="com.example.androidtv.MainFragment"/>
</androidx.constraintlayout.widget.ConstraintLayout>

这条一定要加他会把mainfragment绑上去
android:name="com.example.androidtv.MainFragment
成果如下``