Multi Property Animation : Animation « Animation « Android

1. Android
2. Animation
3. Animation

Multi Property Animation

    
/*
 * 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.*;
import android.view.animation.AccelerateInterpolator;
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.BounceInterpolator;
import android.widget.Button;
import android.widget.LinearLayout;

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;
    }
}

/**
 * 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 MultiPropertyAnimation extends Activity {

    private static final int DURATION = 1500;

    @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 {

        private static final float BALL_SIZE = 100f;

        public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
        AnimatorSet animation = null;
        Animator bounceAnim = null;
        ShapeHolder ball = null;

        public MyAnimationView(Context context) {
            super(context);
            addBall(50, 0);
            addBall(150, 0);
            addBall(250, 0);
            addBall(350, 0);
        }

        private void createAnimation() {
            if (bounceAnim == null) {
                ShapeHolder ball;
                ball = balls.get(0);
                ObjectAnimator yBouncer = ObjectAnimator.ofFloat(ball, "y",
                        ball.getY(), getHeight() - BALL_SIZE).setDuration(DURATION);
                yBouncer.setInterpolator(new BounceInterpolator());
                yBouncer.addUpdateListener(this);

                ball = balls.get(1);
                PropertyValuesHolder pvhY = PropertyValuesHolder.ofFloat("y", ball.getY(),
                        getHeight() - BALL_SIZE);
                PropertyValuesHolder pvhAlpha = PropertyValuesHolder.ofFloat("alpha", 1.0f, 0f);
                ObjectAnimator yAlphaBouncer = ObjectAnimator.ofPropertyValuesHolder(ball,
                        pvhY, pvhAlpha).setDuration(DURATION/2);
                yAlphaBouncer.setInterpolator(new AccelerateInterpolator());
                yAlphaBouncer.setRepeatCount(1);
                yAlphaBouncer.setRepeatMode(ValueAnimator.REVERSE);


                ball = balls.get(2);
                PropertyValuesHolder pvhW = PropertyValuesHolder.ofFloat("width", ball.getWidth(),
                        ball.getWidth() * 2);
                PropertyValuesHolder pvhH = PropertyValuesHolder.ofFloat("height", ball.getHeight(),
                        ball.getHeight() * 2);
                PropertyValuesHolder pvTX = PropertyValuesHolder.ofFloat("x", ball.getX(),
                        ball.getX() - BALL_SIZE/2f);
                PropertyValuesHolder pvTY = PropertyValuesHolder.ofFloat("y", ball.getY(),
                        ball.getY() - BALL_SIZE/2f);
                ObjectAnimator whxyBouncer = ObjectAnimator.ofPropertyValuesHolder(ball, pvhW, pvhH,
                        pvTX, pvTY).setDuration(DURATION/2);
                whxyBouncer.setRepeatCount(1);
                whxyBouncer.setRepeatMode(ValueAnimator.REVERSE);

                ball = balls.get(3);
                pvhY = PropertyValuesHolder.ofFloat("y", ball.getY(), getHeight() - BALL_SIZE);
                float ballX = ball.getX();
                Keyframe kf0 = Keyframe.ofFloat(0f, ballX);
                Keyframe kf1 = Keyframe.ofFloat(.5f, ballX + 100f);
                Keyframe kf2 = Keyframe.ofFloat(1f, ballX + 50f);
                PropertyValuesHolder pvhX = PropertyValuesHolder.ofKeyframe("x", kf0, kf1, kf2);
                ObjectAnimator yxBouncer = ObjectAnimator.ofPropertyValuesHolder(ball, pvhY,
                        pvhX).setDuration(DURATION/2);
                yxBouncer.setRepeatCount(1);
                yxBouncer.setRepeatMode(ValueAnimator.REVERSE);


                bounceAnim = new AnimatorSet();
                ((AnimatorSet)bounceAnim).playTogether(yBouncer, yAlphaBouncer, whxyBouncer,
                        yxBouncer);
            }
        }

        public void startAnimation() {
            createAnimation();
            bounceAnim.start();
        }

        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) {
            for (ShapeHolder ball : balls) {
                canvas.translate(ball.getX(), ball.getY());
                ball.getShape().draw(canvas);
                canvas.translate(-ball.getX(), -ball.getY());
            }
        }

        public void onAnimationUpdate(ValueAnimator animation) {
            invalidate();
        }

    }
}

//main.xml


<?xml version="1.0" encoding="utf-8"?>
<!-- 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.
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/container"
    >
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Run"
        android:id="@+id/startButton"
        />
</LinearLayout>

   
    
    
    
  

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