| /* |
| * 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.ObjectAnimator; |
| import android.animation.ValueAnimator; |
| 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; |
| import android.view.animation.AccelerateInterpolator; |
| |
| /** |
| * See the comments in Bouncer for the overall functionality of this app. Changes for this |
| * variation are down in the animation setup code. |
| */ |
| public class Bouncer3 extends Activity { |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.activity_bouncer3); |
| } |
| |
| 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(); |
| } |
| |
| 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); |
| } |
| |
| 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); |
| } |
| |
| 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(); |
| } |
| }); |
| } |
| |
| @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 variation uses an ObjectAnimator. The functionality is exactly the same as |
| // in Bouncer2, but this time the boilerplate code is greatly reduced because we |
| // tell ObjectAnimator to automatically animate the target object for us, so we no |
| // longer need to listen for frame updates and do that work ourselves. |
| ObjectAnimator anim = getObjectAnimator(); |
| anim.setRepeatCount(ValueAnimator.INFINITE); |
| anim.setRepeatMode(ValueAnimator.REVERSE); |
| anim.setInterpolator(new AccelerateInterpolator()); |
| anim.start(); |
| } |
| |
| ObjectAnimator getObjectAnimator() { |
| return ObjectAnimator.ofInt(this, "shapeY", 0, (getHeight() - mShapeH)); |
| } |
| |
| } |
| } |