samples/ApiDemos/src/com/example/android/apis/animation/Transitions.java

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.apis.animation;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.transition.Scene;
import android.transition.TransitionInflater;
import android.transition.TransitionManager;
import com.example.android.apis.R;

/**
 * This application demonstrates some of the capabilities and uses of the
 * {@link android.transition transitions} APIs. Scenes and a TransitionManager
 * are loaded from resource files and transitions are run between those scenes
 * as well as a dynamically-configured scene.
 */
public class Transitions extends Activity {

    Scene mScene1, mScene2, mScene3;
    ViewGroup mSceneRoot;
    TransitionManager mTransitionManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.transition);

        mSceneRoot = (ViewGroup) findViewById(R.id.sceneRoot);

        TransitionInflater inflater = TransitionInflater.from(this);

        // Note that this is not the only way to create a Scene object, but that
        // loading them from layout resources cooperates with the
        // TransitionManager that we are also loading from resources, and which
        // uses the same layout resource files to determine the scenes to transition
        // from/to.
        mScene1 = Scene.getSceneForLayout(mSceneRoot, R.layout.transition_scene1, this);
        mScene2 = Scene.getSceneForLayout(mSceneRoot, R.layout.transition_scene2, this);
        mScene3 = Scene.getSceneForLayout(mSceneRoot, R.layout.transition_scene3, this);
        mTransitionManager = inflater.inflateTransitionManager(R.transition.transitions_mgr,
                mSceneRoot);
    }

    public void selectScene(View view) {
        switch (view.getId()) {
            case R.id.scene1:
                mTransitionManager.transitionTo(mScene1);
                break;
            case R.id.scene2:
                mTransitionManager.transitionTo(mScene2);
                break;
            case R.id.scene3:
                mTransitionManager.transitionTo(mScene3);
                break;
            case R.id.scene4:
                // scene4 is not an actual 'Scene', but rather a dynamic change in the UI,
                // transitioned to using beginDelayedTransition() to tell the TransitionManager
                // to get ready to run a transition at the next frame
                TransitionManager.beginDelayedTransition(mSceneRoot);
                setNewSize(R.id.view1, 150, 25);
                setNewSize(R.id.view2, 150, 25);
                setNewSize(R.id.view3, 150, 25);
                setNewSize(R.id.view4, 150, 25);
                break;
        }
    }

    private void setNewSize(int id, int width, int height) {
        View view = findViewById(id);
        ViewGroup.LayoutParams params = view.getLayoutParams();
        params.width = width;
        params.height = height;
        view.setLayoutParams(params);
    }
}