BasicTransitionFragment.java

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/*
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 * Copyright (C) 2013 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.basictransition;
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import android.os.Bundle;
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import android.support.v4.app.Fragment;
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import android.transition.Scene;
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import android.transition.TransitionInflater;
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import android.transition.TransitionManager;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.RadioGroup;
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public class BasicTransitionFragment extends Fragment
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        implements RadioGroup.OnCheckedChangeListener {
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    // We transition between these Scenes
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    private Scene mScene1;
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    private Scene mScene2;
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    private Scene mScene3;
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    /** A custom TransitionManager */
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    private TransitionManager mTransitionManagerForScene3;
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    /** Transitions take place in this ViewGroup. We retain this for the dynamic transition on scene 4. */
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    private ViewGroup mSceneRoot;
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    public static BasicTransitionFragment newInstance() {
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        return new BasicTransitionFragment();
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    }
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    public BasicTransitionFragment() {
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    }
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    @Override
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    public View onCreateView(LayoutInflater inflater, ViewGroup container,
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                             Bundle savedInstanceState) {
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        View view = inflater.inflate(R.layout.fragment_basic_transition, container, false);
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        assert view != null;
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        RadioGroup radioGroup = (RadioGroup) view.findViewById(R.id.select_scene);
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        radioGroup.setOnCheckedChangeListener(this);
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        mSceneRoot = (ViewGroup) view.findViewById(R.id.scene_root);
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        // A Scene can be instantiated from a live view hierarchy.
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        mScene1 = new Scene(mSceneRoot, (ViewGroup) mSceneRoot.findViewById(R.id.container));
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        // You can also inflate a generate a Scene from a layout resource file.
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        mScene2 = Scene.getSceneForLayout(mSceneRoot, R.layout.scene2, getActivity());
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        // Another scene from a layout resource file.
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        mScene3 = Scene.getSceneForLayout(mSceneRoot, R.layout.scene3, getActivity());
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        // We create a custom TransitionManager for Scene 3, in which ChangeBounds and Fade
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        // take place at the same time.
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        mTransitionManagerForScene3 = TransitionInflater.from(getActivity())
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                .inflateTransitionManager(R.transition.scene3_transition_manager, mSceneRoot);
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        return view;
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    }
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    @Override
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    public void onCheckedChanged(RadioGroup group, int checkedId) {
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        switch (checkedId) {
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            case R.id.select_scene_1: {
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                // You can start an automatic transition with TransitionManager.go().
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                TransitionManager.go(mScene1);
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                break;
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            }
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            case R.id.select_scene_2: {
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                TransitionManager.go(mScene2);
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                break;
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            }
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            case R.id.select_scene_3: {
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                // You can also start a transition with a custom TransitionManager.
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                mTransitionManagerForScene3.transitionTo(mScene3);
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                break;
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            }
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            case R.id.select_scene_4: {
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                // Alternatively, transition can be invoked dynamically without a Scene.
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                // For this, we first call TransitionManager.beginDelayedTransition().
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                TransitionManager.beginDelayedTransition(mSceneRoot);
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                // Then, we can just change view properties as usual.
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                View square = mSceneRoot.findViewById(R.id.transition_square);
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                ViewGroup.LayoutParams params = square.getLayoutParams();
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                int newSize = getResources().getDimensionPixelSize(R.dimen.square_size_expanded);
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                params.width = newSize;
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                params.height = newSize;
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                square.setLayoutParams(params);
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                break;
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            }
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        }
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    }
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}