/*
* 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;
import java.util.ArrayList;
import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
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.graphics.drawable.shapes.Shape;
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 balls = new ArrayList();
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) {
}
}
}
/**
* A data structure that holds a Shape and various properties that can be used
* to define how the shape is drawn.
*/
class ShapeHolder {
private float x = 0, y = 0;
private ShapeDrawable shape;
private int color;
private RadialGradient gradient;
private float alpha = 1f;
private Paint paint;
public void setPaint(Paint value) {
paint = value;
}
public Paint getPaint() {
return paint;
}
public void setX(float value) {
x = value;
}
public float getX() {
return x;
}
public void setY(float value) {
y = value;
}
public float getY() {
return y;
}
public void setShape(ShapeDrawable value) {
shape = value;
}
public ShapeDrawable getShape() {
return shape;
}
public int getColor() {
return color;
}
public void setColor(int value) {
shape.getPaint().setColor(value);
color = value;
}
public void setGradient(RadialGradient value) {
gradient = value;
}
public RadialGradient getGradient() {
return gradient;
}
public void setAlpha(float alpha) {
this.alpha = alpha;
shape.setAlpha((int) ((alpha * 255f) + .5f));
}
public float getWidth() {
return shape.getShape().getWidth();
}
public void setWidth(float width) {
Shape s = shape.getShape();
s.resize(width, s.getHeight());
}
public float getHeight() {
return shape.getShape().getHeight();
}
public void setHeight(float height) {
Shape s = shape.getShape();
s.resize(s.getWidth(), height);
}
public ShapeHolder(ShapeDrawable s) {
shape = s;
}
}
//layout/animation_seeking.xml
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/container"
>
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Run"
android:id="@+id/startButton"
/>
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/seekBar"
/>