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/*
* 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.ObjectAnimator;
import android.animation.ValueAnimator;
import com.example.android.apis.R;
import java.util.ArrayList;
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.AccelerateInterpolator;
import android.widget.Button;
import android.widget.LinearLayout;
public class ReversingAnimation extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.animation_reversing);
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();
}
});
Button reverser = (Button) findViewById(R.id.reverseButton);
reverser.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
animView.reverseAnimation();
}
});
}
public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener {
public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
ValueAnimator bounceAnim = null;
ShapeHolder ball = null;
public MyAnimationView(Context context) {
super(context);
ball = createBall(25, 25);
}
private void createAnimation() {
if (bounceAnim == null) {
bounceAnim = ObjectAnimator.ofFloat(ball, "y", ball.getY(), getHeight() - 50f).
setDuration(1500);
bounceAnim.setInterpolator(new AccelerateInterpolator(2f));
bounceAnim.addUpdateListener(this);
}
}
public void startAnimation() {
createAnimation();
bounceAnim.start();
}
public void reverseAnimation() {
createAnimation();
bounceAnim.reverse();
}
public void seek(long seekTime) {
createAnimation();
bounceAnim.setCurrentPlayTime(seekTime);
}
private ShapeHolder createBall(float x, float y) {
OvalShape circle = new OvalShape();
circle.resize(50f, 50f);
ShapeDrawable drawable = new ShapeDrawable(circle);
ShapeHolder shapeHolder = new ShapeHolder(drawable);
shapeHolder.setX(x - 25f);
shapeHolder.setY(y - 25f);
int red = (int)(Math.random() * 255);
int green = (int)(Math.random() * 255);
int blue = (int)(Math.random() * 255);
int color = 0xff000000 | red << 16 | green << 8 | blue;
Paint paint = drawable.getPaint(); //new Paint(Paint.ANTI_ALIAS_FLAG);
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);
return shapeHolder;
}
@Override
protected void onDraw(Canvas canvas) {
canvas.save();
canvas.translate(ball.getX(), ball.getY());
ball.getShape().draw(canvas);
canvas.restore();
}
public void onAnimationUpdate(ValueAnimator animation) {
invalidate();
}
}
}
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