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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 
     17 package com.example.android.bouncer;
     18 
     19 import android.animation.ValueAnimator;
     20 import android.animation.ValueAnimator.AnimatorUpdateListener;
     21 import android.app.Activity;
     22 import android.content.Context;
     23 import android.graphics.Bitmap;
     24 import android.graphics.BitmapFactory;
     25 import android.graphics.Canvas;
     26 import android.graphics.Paint;
     27 import android.os.Bundle;
     28 import android.util.AttributeSet;
     29 import 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  */
     35 public 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