1/* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.example.android.support.transition.widget; 18 19import android.os.Bundle; 20import android.view.LayoutInflater; 21import android.view.View; 22import android.view.ViewGroup; 23 24import androidx.annotation.Nullable; 25import androidx.core.view.ViewCompat; 26import androidx.fragment.app.Fragment; 27import androidx.fragment.app.FragmentManager; 28import androidx.interpolator.view.animation.FastOutSlowInInterpolator; 29import androidx.transition.AutoTransition; 30import androidx.transition.Fade; 31import androidx.transition.Transition; 32 33import com.example.android.support.transition.R; 34 35/** 36 * Demonstrates usage of shared element Transition between Fragments. 37 */ 38public class FragmentTransitionUsage extends TransitionUsageBase { 39 40 private static final String SHARED = "red"; 41 42 private static final Transition SHARED_TRANSITION = new AutoTransition(); 43 private static final Transition NON_SHARED_TRANSITION = new Fade(); 44 45 static { 46 SHARED_TRANSITION.setDuration(1000); 47 SHARED_TRANSITION.setInterpolator(new FastOutSlowInInterpolator()); 48 NON_SHARED_TRANSITION.setDuration(1000); 49 NON_SHARED_TRANSITION.setInterpolator(new FastOutSlowInInterpolator()); 50 } 51 52 private static final String FRAGMENT_FIRST = "first"; 53 private static final String FRAGMENT_SECOND = "second"; 54 55 @Override 56 int getLayoutResId() { 57 return R.layout.fragment_transition; 58 } 59 60 @Override 61 protected void onCreate(Bundle savedInstanceState) { 62 super.onCreate(savedInstanceState); 63 if (savedInstanceState == null) { 64 getSupportFragmentManager().beginTransaction() 65 .replace(R.id.container, new FirstFragment(), FRAGMENT_FIRST) 66 .setReorderingAllowed(true) 67 .commitNow(); 68 } 69 } 70 71 void showSecond(View sharedElement) { 72 FragmentManager fragmentManager = getSupportFragmentManager(); 73 final FirstFragment first = 74 (FirstFragment) fragmentManager.findFragmentByTag(FRAGMENT_FIRST); 75 if (first == null) { 76 return; 77 } 78 final SecondFragment second = new SecondFragment(); 79 80 fragmentManager.beginTransaction() 81 .replace(R.id.container, second, FRAGMENT_SECOND) 82 .addToBackStack(null) 83 .setReorderingAllowed(true) 84 .addSharedElement(sharedElement, SHARED) 85 .commit(); 86 } 87 88 private abstract static class TransitionFragment extends Fragment { 89 90 @Override 91 public void onActivityCreated(@Nullable Bundle savedInstanceState) { 92 super.onActivityCreated(savedInstanceState); 93 setSharedElementEnterTransition(SHARED_TRANSITION); 94 setSharedElementReturnTransition(SHARED_TRANSITION); 95 setExitTransition(NON_SHARED_TRANSITION); 96 setEnterTransition(NON_SHARED_TRANSITION); 97 setReenterTransition(NON_SHARED_TRANSITION); 98 setReturnTransition(NON_SHARED_TRANSITION); 99 setAllowEnterTransitionOverlap(true); 100 setAllowReturnTransitionOverlap(true); 101 } 102 103 } 104 105 /** 106 * A {@link Fragment} with red and yellow squares. 107 */ 108 public static class FirstFragment extends TransitionFragment { 109 110 @Nullable 111 @Override 112 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, 113 @Nullable Bundle savedInstanceState) { 114 return inflater.inflate(R.layout.fragment_transition_first, container, false); 115 } 116 117 @Override 118 public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 119 final View red = view.findViewById(R.id.red); 120 ViewCompat.setTransitionName(red, SHARED); 121 view.findViewById(R.id.move).setOnClickListener(new View.OnClickListener() { 122 @Override 123 public void onClick(View v) { 124 FragmentTransitionUsage activity = (FragmentTransitionUsage) getActivity(); 125 if (activity != null) { 126 activity.showSecond(red); 127 } 128 } 129 }); 130 } 131 132 } 133 134 /** 135 * A {@link Fragment} with red and blue squares. 136 */ 137 public static class SecondFragment extends TransitionFragment { 138 139 @Nullable 140 @Override 141 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, 142 @Nullable Bundle savedInstanceState) { 143 return inflater.inflate(R.layout.fragment_transition_second, container, false); 144 } 145 146 @Override 147 public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 148 ViewCompat.setTransitionName(view.findViewById(R.id.red), SHARED); 149 } 150 151 } 152 153} 154