| /* |
| * 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.bouncer; |
| |
| import android.animation.ValueAnimator; |
| import android.animation.ValueAnimator.AnimatorUpdateListener; |
| import android.app.Activity; |
| import android.content.Context; |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| import android.os.Bundle; |
| import android.util.AttributeSet; |
| import android.view.View; |
| |
| /** |
| * This example shows simple uses of ValueAnimator, ObjectAnimator, and interpolators |
| * to control how a shape is moved around on the screen. |
| * |
| * The Bouncer1, Bouncer2, and Vouncer3 files are exactly like this one except for variations |
| * in how the animation is set up and run. |
| * |
| * Watch the associated video for this demo on the DevBytes channel of developer.android.com |
| * or on YouTube at https://www.youtube.com/watch?v=vCTcmPIKgpM. |
| */ |
| public class Bouncer extends Activity { |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.activity_bouncer); |
| } |
| |
| /** |
| * A custom view is used to paint the green background and the shape. |
| */ |
| static class MyView extends View { |
| |
| Bitmap mBitmap; |
| Paint paint = new Paint(); |
| int mShapeX, mShapeY; |
| int mShapeW, mShapeH; |
| |
| public MyView(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| setupShape(); |
| } |
| |
| public MyView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| setupShape(); |
| } |
| |
| public MyView(Context context) { |
| super(context); |
| setupShape(); |
| } |
| |
| private void setupShape() { |
| mBitmap = BitmapFactory.decodeResource(getResources(), |
| R.drawable.electricsheep); |
| mShapeW = mBitmap.getWidth(); |
| mShapeH = mBitmap.getHeight(); |
| setOnClickListener(new View.OnClickListener() { |
| @Override |
| public void onClick(View v) { |
| startAnimation(); |
| } |
| }); |
| } |
| |
| /** |
| * Moving the shape in x or y causes an invalidation of the area it used to occupy |
| * plus the area it now occupies. |
| */ |
| public void setShapeX(int shapeX) { |
| int minX = mShapeX; |
| int maxX = mShapeX + mShapeW; |
| mShapeX = shapeX; |
| minX = Math.min(mShapeX, minX); |
| maxX = Math.max(mShapeX + mShapeW, maxX); |
| invalidate(minX, mShapeY, maxX, mShapeY + mShapeH); |
| } |
| |
| /** |
| * Moving the shape in x or y causes an invalidation of the area it used to occupy |
| * plus the area it now occupies. |
| */ |
| public void setShapeY(int shapeY) { |
| int minY = mShapeY; |
| int maxY = mShapeY + mShapeH; |
| mShapeY = shapeY; |
| minY = Math.min(mShapeY, minY); |
| maxY = Math.max(mShapeY + mShapeH, maxY); |
| invalidate(mShapeX, minY, mShapeX + mShapeW, maxY); |
| } |
| |
| @Override |
| protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| mShapeX = (w - mBitmap.getWidth()) / 2; |
| mShapeY = 0; |
| } |
| |
| @Override |
| protected void onDraw(Canvas canvas) { |
| canvas.drawBitmap(mBitmap, mShapeX, mShapeY, paint); |
| } |
| |
| void startAnimation() { |
| // This version uses ValueAnimator, which requires adding an update |
| // listener and manually updating the shape position on each frame. |
| ValueAnimator anim = getValueAnimator(); |
| anim.start(); |
| } |
| |
| ValueAnimator getValueAnimator() { |
| ValueAnimator anim = ValueAnimator.ofFloat(0, 1); |
| anim.addUpdateListener(new AnimatorUpdateListener() { |
| @Override |
| public void onAnimationUpdate(ValueAnimator animation) { |
| setShapeY((int) (animation.getAnimatedFraction() * |
| (getHeight() - mShapeH))); |
| } |
| }); |
| return anim; |
| } |
| |
| } |
| } |