Android navigation Fragment 共享元素动画

依赖 项目级别build.gradle

buildscript {
    dependencies {
        classpath("androidx.navigation:navigation-safe-args-gradle-plugin:2.4.2")
    }
}

 app级别

    implementation 'androidx.navigation:navigation-fragment-ktx:2.5.1'
    implementation 'androidx.navigation:navigation-ui:2.5.1'
}

 顶部添加插件saferargs

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'androidx.navigation.safeargs.kotlin'
}

mainActivity里面没有代码 布局如此

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.fragment.app.FragmentContainerView
            android:id="@+id/navHostFragment"
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:defaultNavHost="true"
            app:navGraph="@navigation/nav_graph" />
    </FrameLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

mav_graph.xml

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nav_graph"
    app:startDestination="@id/mainFragment">

    <fragment
        android:id="@+id/mainFragment"
        android:name="com.example.share_element_anim.MainFragment"
        android:label="MainFragment" >
        <action
            android:id="@+id/action_mainFragment_to_imageFragment"
            app:destination="@id/imageFragment" />
    </fragment>
    <fragment
        android:id="@+id/imageFragment"
        android:name="com.example.share_element_anim.ImageFragment"
        android:label="ImageFragment" />
</navigation>

MainFragment

package com.example.share_element_anim

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.navigation.fragment.FragmentNavigatorExtras
import androidx.navigation.fragment.findNavController
import com.example.share_element_anim.databinding.FragmentMainBinding

class MainFragment : Fragment(R.layout.fragment_main) {
    private lateinit var binding: FragmentMainBinding
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding = FragmentMainBinding.bind(view)
        binding.ivImage.setOnClickListener {
            val extras = FragmentNavigatorExtras(binding.ivImage to "image_big")
            findNavController().navigate(
                R.id.action_mainFragment_to_imageFragment,
                null,
                null,
                extras
            )

        }
    }


    override fun onDestroy() {
        super.onDestroy()

    }
}

布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/ivImage"
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:transitionName="image_small"
        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_launcher_background" />

</androidx.constraintlayout.widget.ConstraintLayout>

ImageFragment

package com.example.share_element_anim

import android.os.Bundle
import android.transition.TransitionInflater
import androidx.fragment.app.Fragment

class ImageFragment : Fragment(R.layout.fragment_image) {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val animation = TransitionInflater.from(requireContext()).inflateTransition(
            android.R.transition.move
        )
        sharedElementEnterTransition = animation
        sharedElementReturnTransition = animation
    }
}

布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/ivImage"
        android:layout_width="0dp"
        android:layout_height="500dp"
        android:scaleType="centerCrop"
        android:transitionName="image_big"
        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_launcher_background" />

</androidx.constraintlayout.widget.ConstraintLayout>