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      1 /*
      2  * Copyright (C) 2013 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 package com.example.android.apis.animation;
     17 
     18 import android.app.Activity;
     19 import android.os.Bundle;
     20 import android.view.View;
     21 import android.view.ViewGroup;
     22 import android.transition.Scene;
     23 import android.transition.TransitionInflater;
     24 import android.transition.TransitionManager;
     25 import com.example.android.apis.R;
     26 
     27 /**
     28  * This application demonstrates some of the capabilities and uses of the
     29  * {@link android.transition transitions} APIs. Scenes and a TransitionManager
     30  * are loaded from resource files and transitions are run between those scenes
     31  * as well as a dynamically-configured scene.
     32  */
     33 public class Transitions extends Activity {
     34 
     35     Scene mScene1, mScene2, mScene3;
     36     ViewGroup mSceneRoot;
     37     TransitionManager mTransitionManager;
     38 
     39     @Override
     40     protected void onCreate(Bundle savedInstanceState) {
     41         super.onCreate(savedInstanceState);
     42         setContentView(R.layout.transition);
     43 
     44         mSceneRoot = (ViewGroup) findViewById(R.id.sceneRoot);
     45 
     46         TransitionInflater inflater = TransitionInflater.from(this);
     47 
     48         // Note that this is not the only way to create a Scene object, but that
     49         // loading them from layout resources cooperates with the
     50         // TransitionManager that we are also loading from resources, and which
     51         // uses the same layout resource files to determine the scenes to transition
     52         // from/to.
     53         mScene1 = Scene.getSceneForLayout(mSceneRoot, R.layout.transition_scene1, this);
     54         mScene2 = Scene.getSceneForLayout(mSceneRoot, R.layout.transition_scene2, this);
     55         mScene3 = Scene.getSceneForLayout(mSceneRoot, R.layout.transition_scene3, this);
     56         mTransitionManager = inflater.inflateTransitionManager(R.transition.transitions_mgr,
     57                 mSceneRoot);
     58     }
     59 
     60     public void selectScene(View view) {
     61         switch (view.getId()) {
     62             case R.id.scene1:
     63                 mTransitionManager.transitionTo(mScene1);
     64                 break;
     65             case R.id.scene2:
     66                 mTransitionManager.transitionTo(mScene2);
     67                 break;
     68             case R.id.scene3:
     69                 mTransitionManager.transitionTo(mScene3);
     70                 break;
     71             case R.id.scene4:
     72                 // scene4 is not an actual 'Scene', but rather a dynamic change in the UI,
     73                 // transitioned to using beginDelayedTransition() to tell the TransitionManager
     74                 // to get ready to run a transition at the next frame
     75                 TransitionManager.beginDelayedTransition(mSceneRoot);
     76                 setNewSize(R.id.view1, 150, 25);
     77                 setNewSize(R.id.view2, 150, 25);
     78                 setNewSize(R.id.view3, 150, 25);
     79                 setNewSize(R.id.view4, 150, 25);
     80                 break;
     81         }
     82     }
     83 
     84     private void setNewSize(int id, int width, int height) {
     85         View view = findViewById(id);
     86         ViewGroup.LayoutParams params = view.getLayoutParams();
     87         params.width = width;
     88         params.height = height;
     89         view.setLayoutParams(params);
     90     }
     91 }
     92