动态创建Fragment

MainActivity.kt --->

package com.example.fredric.dynamicfragment

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.support.v4.app.Fragment

import android.view.View

import android.widget.Button

import android.widget.FrameLayout

class MainActivity : AppCompatActivity() , View.OnClickListener {

    override fun onClick(view: View?) {

        when(view?.id) {

            R.id.button ->{

                if(thisFragment) replaceFragment(RightFragment()) else replaceFragment(AnotherRightFragment())

            }

        }

    }

    var thisFragment = false

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        var button = findViewById<Button>(R.id.button)

        button.setOnClickListener(this)

        replaceFragment(RightFragment())

    }

    fun replaceFragment(fragment: Fragment) {

        var fragmentManager = supportFragmentManager

        var transaction = fragmentManager.beginTransaction()

        var rightLayout = findViewById<FrameLayout>(R.id.right_layout)

        if(rightLayout.getTag() == null || rightLayout.getTag().equals("this")) {

            rightLayout.setTag("another")

            thisFragment = false

        }else {

            rightLayout.setTag("this")

            thisFragment = true

        }

        transaction.replace(R.id.right_layout,fragment)

        transaction.commit()

    }

}

LeftFragment.kt ->

package com.example.fredric.dynamicfragment

import android.os.Bundle

import android.support.v4.app.Fragment

import android.view.LayoutInflater

import android.view.View

import android.view.ViewGroup

class LeftFragment : Fragment() {

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View {

        var view = inflater?.inflate(R.layout.left_fragment,container,false)

        return view!!

    }

}


RightFragment.kt -->

package com.example.fredric.dynamicfragment

import android.os.Bundle

import android.support.v4.app.Fragment

import android.view.LayoutInflater

import android.view.View

import android.view.ViewGroup

class RightFragment : Fragment() {

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View {

        var view = inflater?.inflate(R.layout.right_fragment,container,false)

        return view!!

    }

}


AnotherRightFragment.kt --->

package com.example.fredric.dynamicfragment

import android.os.Bundle

import android.support.v4.app.Fragment

import android.view.LayoutInflater

import android.view.View

import android.view.ViewGroup

class AnotherRightFragment : Fragment() {

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View {

        var view = inflater?.inflate(R.layout.another_right_fragment,container,false)

        return view!!

    }

}



activity_main.xml --->

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout 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/left_fragment"

        android:name="com.example.fredric.dynamicfragment.LeftFragment"

        android:layout_width="0dp"

        android:layout_height="match_parent"

        android:layout_weight="1" />

    

    <FrameLayout

        android:id="@+id/right_layout"

        android:layout_width="0dp"

        android:layout_height="match_parent"

        android:layout_weight="1"/>

</LinearLayout>

手机模式：

平板模式：