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      1 /*
      2  * Copyright (C) 2010 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 
     17 package com.example.android.apis.animation;
     18 
     19 // Need the following import to get access to the app resources, since this
     20 // class is in a sub-package.
     21 import android.animation.AnimatorInflater;
     22 import android.animation.AnimatorSet;
     23 import android.animation.ObjectAnimator;
     24 import android.graphics.Color;
     25 import com.example.android.apis.R;
     26 
     27 import java.util.ArrayList;
     28 
     29 import android.animation.Animator;
     30 import android.animation.ValueAnimator;
     31 import android.app.Activity;
     32 import android.content.Context;
     33 import android.graphics.Canvas;
     34 import android.graphics.Paint;
     35 import android.graphics.RadialGradient;
     36 import android.graphics.Shader;
     37 import android.graphics.drawable.ShapeDrawable;
     38 import android.graphics.drawable.shapes.OvalShape;
     39 import android.os.Bundle;
     40 import android.view.View;
     41 import android.widget.Button;
     42 import android.widget.LinearLayout;
     43 
     44 /**
     45  * This application demonstrates loading Animator objects from XML resources.
     46  */
     47 public class AnimationLoading extends Activity {
     48 
     49     private static final int DURATION = 1500;
     50 
     51     /** Called when the activity is first created. */
     52     @Override
     53     public void onCreate(Bundle savedInstanceState) {
     54         super.onCreate(savedInstanceState);
     55         setContentView(R.layout.animation_loading);
     56         LinearLayout container = (LinearLayout) findViewById(R.id.container);
     57         final MyAnimationView animView = new MyAnimationView(this);
     58         container.addView(animView);
     59 
     60         Button starter = (Button) findViewById(R.id.startButton);
     61         starter.setOnClickListener(new View.OnClickListener() {
     62             public void onClick(View v) {
     63                 animView.startAnimation();
     64             }
     65         });
     66     }
     67 
     68     public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener {
     69 
     70         private static final float BALL_SIZE = 100f;
     71 
     72         public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
     73         Animator animation = null;
     74 
     75         public MyAnimationView(Context context) {
     76             super(context);
     77             addBall(50, 50);
     78             addBall(200, 50);
     79             addBall(350, 50);
     80             addBall(500, 50, Color.GREEN);
     81         }
     82 
     83         private void createAnimation() {
     84             Context appContext = AnimationLoading.this;
     85 
     86             if (animation == null) {
     87                 ObjectAnimator anim = (ObjectAnimator) AnimatorInflater.
     88                         loadAnimator(appContext, R.anim.object_animator);
     89                 anim.addUpdateListener(this);
     90                 anim.setTarget(balls.get(0));
     91 
     92                 ValueAnimator fader = (ValueAnimator) AnimatorInflater.
     93                         loadAnimator(appContext, R.anim.animator);
     94                 fader.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
     95                     public void onAnimationUpdate(ValueAnimator animation) {
     96                         balls.get(1).setAlpha((Float) animation.getAnimatedValue());
     97                     }
     98                 });
     99 
    100                 AnimatorSet seq =
    101                         (AnimatorSet) AnimatorInflater.loadAnimator(appContext,
    102                         R.anim.animator_set);
    103                 seq.setTarget(balls.get(2));
    104 
    105                 ObjectAnimator colorizer = (ObjectAnimator) AnimatorInflater.
    106                         loadAnimator(appContext, R.anim.color_animator);
    107                 colorizer.setTarget(balls.get(3));
    108 
    109                 animation = new AnimatorSet();
    110                 ((AnimatorSet) animation).playTogether(anim, fader, seq, colorizer);
    111             }
    112         }
    113 
    114         public void startAnimation() {
    115             createAnimation();
    116             animation.start();
    117         }
    118 
    119         private ShapeHolder createBall(float x, float y) {
    120             OvalShape circle = new OvalShape();
    121             circle.resize(BALL_SIZE, BALL_SIZE);
    122             ShapeDrawable drawable = new ShapeDrawable(circle);
    123             ShapeHolder shapeHolder = new ShapeHolder(drawable);
    124             shapeHolder.setX(x);
    125             shapeHolder.setY(y);
    126             return shapeHolder;
    127         }
    128 
    129         private void addBall(float x, float y, int color) {
    130             ShapeHolder shapeHolder = createBall(x, y);
    131             shapeHolder.setColor(color);
    132             balls.add(shapeHolder);
    133         }
    134 
    135         private void addBall(float x, float y) {
    136             ShapeHolder shapeHolder = createBall(x, y);
    137             int red = (int)(100 + Math.random() * 155);
    138             int green = (int)(100 + Math.random() * 155);
    139             int blue = (int)(100 + Math.random() * 155);
    140             int color = 0xff000000 | red << 16 | green << 8 | blue;
    141             Paint paint = shapeHolder.getShape().getPaint();
    142             int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
    143             RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
    144                     50f, color, darkColor, Shader.TileMode.CLAMP);
    145             paint.setShader(gradient);
    146             balls.add(shapeHolder);
    147         }
    148 
    149         @Override
    150         protected void onDraw(Canvas canvas) {
    151             for (ShapeHolder ball : balls) {
    152                 canvas.translate(ball.getX(), ball.getY());
    153                 ball.getShape().draw(canvas);
    154                 canvas.translate(-ball.getX(), -ball.getY());
    155             }
    156         }
    157 
    158         public void onAnimationUpdate(ValueAnimator animation) {
    159 
    160             invalidate();
    161             ShapeHolder ball = balls.get(0);
    162             ball.setY((Float)animation.getAnimatedValue());
    163         }
    164     }
    165 }