| /* |
| * Copyright (C) 2010 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.apis.animation; |
| |
| // Need the following import to get access to the app resources, since this |
| // class is in a sub-package. |
| import android.animation.Animator; |
| import com.example.android.apis.R; |
| |
| import java.util.ArrayList; |
| |
| import android.animation.ValueAnimator; |
| import android.animation.ObjectAnimator; |
| import android.animation.AnimatorSet; |
| import android.app.Activity; |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| import android.graphics.RadialGradient; |
| import android.graphics.Shader; |
| import android.graphics.drawable.ShapeDrawable; |
| import android.graphics.drawable.shapes.OvalShape; |
| import android.os.Bundle; |
| import android.view.View; |
| import android.view.animation.BounceInterpolator; |
| import android.widget.Button; |
| import android.widget.LinearLayout; |
| import android.widget.SeekBar; |
| |
| /** |
| * This application demonstrates the seeking capability of ValueAnimator. The SeekBar in the |
| * UI allows you to set the position of the animation. Pressing the Run button will play from |
| * the current position of the animation. |
| */ |
| public class AnimationSeeking extends Activity { |
| |
| private static final int DURATION = 1500; |
| private SeekBar mSeekBar; |
| |
| /** Called when the activity is first created. */ |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.animation_seeking); |
| LinearLayout container = (LinearLayout) findViewById(R.id.container); |
| final MyAnimationView animView = new MyAnimationView(this); |
| container.addView(animView); |
| |
| Button starter = (Button) findViewById(R.id.startButton); |
| starter.setOnClickListener(new View.OnClickListener() { |
| public void onClick(View v) { |
| animView.startAnimation(); |
| } |
| }); |
| |
| mSeekBar = (SeekBar) findViewById(R.id.seekBar); |
| mSeekBar.setMax(DURATION); |
| mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { |
| public void onStopTrackingTouch(SeekBar seekBar) { |
| } |
| |
| public void onStartTrackingTouch(SeekBar seekBar) { |
| } |
| |
| public void onProgressChanged(SeekBar seekBar, int progress, |
| boolean fromUser) { |
| // prevent seeking on app creation |
| if (animView.getHeight() != 0) { |
| animView.seek(progress); |
| } |
| } |
| }); |
| } |
| |
| public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener, Animator.AnimatorListener { |
| |
| private static final int RED = 0xffFF8080; |
| private static final int BLUE = 0xff8080FF; |
| private static final int CYAN = 0xff80ffff; |
| private static final int GREEN = 0xff80ff80; |
| private static final float BALL_SIZE = 100f; |
| |
| public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>(); |
| AnimatorSet animation = null; |
| ValueAnimator bounceAnim = null; |
| ShapeHolder ball = null; |
| |
| public MyAnimationView(Context context) { |
| super(context); |
| ball = addBall(200, 0); |
| } |
| |
| private void createAnimation() { |
| if (bounceAnim == null) { |
| bounceAnim = ObjectAnimator.ofFloat(ball, "y", |
| ball.getY(), getHeight() - BALL_SIZE).setDuration(1500); |
| bounceAnim.setInterpolator(new BounceInterpolator()); |
| bounceAnim.addUpdateListener(this); |
| } |
| } |
| |
| public void startAnimation() { |
| createAnimation(); |
| bounceAnim.start(); |
| } |
| |
| public void seek(long seekTime) { |
| createAnimation(); |
| bounceAnim.setCurrentPlayTime(seekTime); |
| } |
| |
| private ShapeHolder addBall(float x, float y) { |
| OvalShape circle = new OvalShape(); |
| circle.resize(BALL_SIZE, BALL_SIZE); |
| ShapeDrawable drawable = new ShapeDrawable(circle); |
| ShapeHolder shapeHolder = new ShapeHolder(drawable); |
| shapeHolder.setX(x); |
| shapeHolder.setY(y); |
| int red = (int)(100 + Math.random() * 155); |
| int green = (int)(100 + Math.random() * 155); |
| int blue = (int)(100 + Math.random() * 155); |
| int color = 0xff000000 | red << 16 | green << 8 | blue; |
| Paint paint = drawable.getPaint(); |
| int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4; |
| RadialGradient gradient = new RadialGradient(37.5f, 12.5f, |
| 50f, color, darkColor, Shader.TileMode.CLAMP); |
| paint.setShader(gradient); |
| shapeHolder.setPaint(paint); |
| balls.add(shapeHolder); |
| return shapeHolder; |
| } |
| |
| @Override |
| protected void onDraw(Canvas canvas) { |
| canvas.translate(ball.getX(), ball.getY()); |
| ball.getShape().draw(canvas); |
| } |
| |
| public void onAnimationUpdate(ValueAnimator animation) { |
| invalidate(); |
| long playtime = bounceAnim.getCurrentPlayTime(); |
| //mSeekBar.setProgress((int)playtime); |
| } |
| |
| public void onAnimationCancel(Animator animation) { |
| } |
| |
| public void onAnimationEnd(Animator animation) { |
| balls.remove(((ObjectAnimator)animation).getTarget()); |
| |
| } |
| |
| public void onAnimationRepeat(Animator animation) { |
| } |
| |
| public void onAnimationStart(Animator animation) { |
| } |
| } |
| } |