/*
* 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.widget.Button;
import com.example.android.apis.R;
import android.animation.*;
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.view.animation.DecelerateInterpolator;
import android.widget.LinearLayout;
import java.util.ArrayList;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.Shape;
import android.view.View;
/**
* 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;
}
}
public class AnimationCloning extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
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();
}
});
}
public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener {
public final ArrayList balls = new ArrayList();
AnimatorSet animation = null;
private float mDensity;
public MyAnimationView(Context context) {
super(context);
mDensity = getContext().getResources().getDisplayMetrics().density;
ShapeHolder ball0 = addBall(50f, 25f);
ShapeHolder ball1 = addBall(150f, 25f);
ShapeHolder ball2 = addBall(250f, 25f);
ShapeHolder ball3 = addBall(350f, 25f);
}
private void createAnimation() {
if (animation == null) {
ObjectAnimator anim1 = ObjectAnimator.ofFloat(balls.get(0), "y",
0f, getHeight() - balls.get(0).getHeight()).setDuration(500);
ObjectAnimator anim2 = anim1.clone();
anim2.setTarget(balls.get(1));
anim1.addUpdateListener(this);
ShapeHolder ball2 = balls.get(2);
ObjectAnimator animDown = ObjectAnimator.ofFloat(ball2, "y",
0f, getHeight() - ball2.getHeight()).setDuration(500);
animDown.setInterpolator(new AccelerateInterpolator());
ObjectAnimator animUp = ObjectAnimator.ofFloat(ball2, "y",
getHeight() - ball2.getHeight(), 0f).setDuration(500);
animUp.setInterpolator(new DecelerateInterpolator());
AnimatorSet s1 = new AnimatorSet();
s1.playSequentially(animDown, animUp);
animDown.addUpdateListener(this);
animUp.addUpdateListener(this);
AnimatorSet s2 = (AnimatorSet) s1.clone();
s2.setTarget(balls.get(3));
animation = new AnimatorSet();
animation.playTogether(anim1, anim2, s1);
animation.playSequentially(s1, s2);
}
}
private ShapeHolder addBall(float x, float y) {
OvalShape circle = new OvalShape();
circle.resize(50f * mDensity, 50f * mDensity);
ShapeDrawable drawable = new ShapeDrawable(circle);
ShapeHolder shapeHolder = new ShapeHolder(drawable);
shapeHolder.setX(x - 25f);
shapeHolder.setY(y - 25f);
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(); //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);
balls.add(shapeHolder);
return shapeHolder;
}
@Override
protected void onDraw(Canvas canvas) {
for (int i = 0; i < balls.size(); ++i) {
ShapeHolder shapeHolder = balls.get(i);
canvas.save();
canvas.translate(shapeHolder.getX(), shapeHolder.getY());
shapeHolder.getShape().draw(canvas);
canvas.restore();
}
}
public void startAnimation() {
createAnimation();
animation.start();
}
public void onAnimationUpdate(ValueAnimator animation) {
invalidate();
}
}
}
//main.xml
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/container"
>
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Run"
android:id="@+id/startButton"
/>