KotlinFragment使用方法详解

<FrameLayout 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=".LeftFragment">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="这是左边" />
</FrameLayout>

<FrameLayout 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=".RightFragment">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="这是右边" />
</FrameLayout>

class LeftFragment : Fragment() {
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_left, container, false)
    }
}

class RightFragment : Fragment() {
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_right, container, false)
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <fragment
        android:id="@+id/leftFrag"
        android:name="com.hui.fragment.LeftFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"/>
    <fragment
        android:id="@+id/rightFrag"
        android:name="com.hui.fragment.RightFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"/>
</LinearLayout>

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
}

val fragmentManager=supportFragmentManager

val transaction=fragmentManager.beginTransaction()

transaction.replace(R.id.rightLayout,fragment)
//replace()方法需要传入容器的id和待添加的Fragment实例

transaction.commit()