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
17package com.example.android.bouncer;
18
19import android.animation.ValueAnimator;
20import android.animation.ValueAnimator.AnimatorUpdateListener;
21import android.app.Activity;
22import android.content.Context;
23import android.graphics.Bitmap;
24import android.graphics.BitmapFactory;
25import android.graphics.Canvas;
26import android.graphics.Paint;
27import android.os.Bundle;
28import android.util.AttributeSet;
29import android.view.View;
30
31/**
32 * See the comments in Bouncer for the overall functionality of this app. Changes for this
33 * variation are down in the animation setup code.
34 */
35public class Bouncer1 extends Activity {
36
37    @Override
38    public void onCreate(Bundle savedInstanceState) {
39        super.onCreate(savedInstanceState);
40        setContentView(R.layout.activity_bouncer1);
41    }
42
43    static class MyView extends View {
44
45        Bitmap mBitmap;
46        Paint paint = new Paint();
47        int mShapeX, mShapeY;
48        int mShapeW, mShapeH;
49
50        public MyView(Context context, AttributeSet attrs, int defStyle) {
51            super(context, attrs, defStyle);
52            setupShape();
53        }
54
55        public MyView(Context context, AttributeSet attrs) {
56            super(context, attrs);
57            setupShape();
58        }
59
60        public MyView(Context context) {
61            super(context);
62            setupShape();
63        }
64
65        public void setShapeX(int shapeX) {
66            int minX = mShapeX;
67            int maxX = mShapeX + mShapeW;
68            mShapeX = shapeX;
69            minX = Math.min(mShapeX, minX);
70            maxX = Math.max(mShapeX + mShapeW, maxX);
71            invalidate(minX, mShapeY, maxX, mShapeY + mShapeH);
72        }
73
74        public void setShapeY(int shapeY) {
75            int minY = mShapeY;
76            int maxY = mShapeY + mShapeH;
77            mShapeY = shapeY;
78            minY = Math.min(mShapeY, minY);
79            maxY = Math.max(mShapeY + mShapeH, maxY);
80            invalidate(mShapeX, minY, mShapeX + mShapeW, maxY);
81        }
82
83        private void setupShape() {
84            mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.electricsheep);
85            mShapeW = mBitmap.getWidth();
86            mShapeH = mBitmap.getHeight();
87            setOnClickListener(new View.OnClickListener() {
88                @Override
89                public void onClick(View v) {
90                    startAnimation();
91                }
92            });
93        }
94
95        @Override
96        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
97            mShapeX = (w - mBitmap.getWidth()) / 2;
98            mShapeY = 0;
99        }
100
101        @Override
102        protected void onDraw(Canvas canvas) {
103            canvas.drawBitmap(mBitmap, mShapeX, mShapeY, paint);
104        }
105
106        void startAnimation() {
107            ValueAnimator anim = getValueAnimator();
108            // In this variation, we put the shape into an infinite bounce, where it keeps moving
109            // up and down. Note that it's still not actually "bouncing" because it just uses
110            // default time interpolation.
111            anim.setRepeatCount(ValueAnimator.INFINITE);
112            anim.setRepeatMode(ValueAnimator.REVERSE);
113            anim.start();
114        }
115
116        ValueAnimator getValueAnimator() {
117            ValueAnimator anim = ValueAnimator.ofFloat(0, 1);
118            anim.addUpdateListener(new AnimatorUpdateListener() {
119                @Override
120                public void onAnimationUpdate(ValueAnimator animation) {
121                    setShapeY((int) (animation.getAnimatedFraction() * (getHeight() - mShapeH)));
122                }
123            });
124            return anim;
125        }
126
127    }
128}
129