How the AnimatorListener events work.
/*
* 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 app.test;
// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.widget.CheckBox;
import android.widget.TextView;
import java.util.ArrayList;
import android.animation.ValueAnimator;
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.AccelerateInterpolator;
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 demo shows how the AnimatorListener events work.
*/
public class Test extends Activity {
TextView startText, repeatText, cancelText, endText;
TextView startTextAnimator, repeatTextAnimator, cancelTextAnimator, endTextAnimator;
@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);
startText = (TextView) findViewById(R.id.startText);
startText.setAlpha(.5f);
repeatText = (TextView) findViewById(R.id.repeatText);
repeatText.setAlpha(.5f);
cancelText = (TextView) findViewById(R.id.cancelText);
cancelText.setAlpha(.5f);
endText = (TextView) findViewById(R.id.endText);
endText.setAlpha(.5f);
startTextAnimator = (TextView) findViewById(R.id.startTextAnimator);
startTextAnimator.setAlpha(.5f);
repeatTextAnimator = (TextView) findViewById(R.id.repeatTextAnimator);
repeatTextAnimator.setAlpha(.5f);
cancelTextAnimator = (TextView) findViewById(R.id.cancelTextAnimator);
cancelTextAnimator.setAlpha(.5f);
endTextAnimator = (TextView) findViewById(R.id.endTextAnimator);
endTextAnimator.setAlpha(.5f);
final CheckBox endCB = (CheckBox) findViewById(R.id.endCB);
Button starter = (Button) findViewById(R.id.startButton);
starter.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
animView.startAnimation(endCB.isChecked());
}
});
Button canceler = (Button) findViewById(R.id.cancelButton);
canceler.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
animView.cancelAnimation();
}
});
Button ender = (Button) findViewById(R.id.endButton);
ender.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
animView.endAnimation();
}
});
}
public class MyAnimationView extends View implements Animator.AnimatorListener,
ValueAnimator.AnimatorUpdateListener {
public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
Animator animation;
ShapeHolder ball = null;
boolean endImmediately = false;
public MyAnimationView(Context context) {
super(context);
ball = createBall(25, 25);
}
private void createAnimation() {
if (animation == null) {
ObjectAnimator yAnim = ObjectAnimator.ofFloat(ball, "y",
ball.getY(), getHeight() - 50f).setDuration(1500);
yAnim.setRepeatCount(0);
yAnim.setRepeatMode(ValueAnimator.REVERSE);
yAnim.setInterpolator(new AccelerateInterpolator(2f));
yAnim.addUpdateListener(this);
yAnim.addListener(this);
ObjectAnimator xAnim = ObjectAnimator.ofFloat(ball, "x",
ball.getX(), ball.getX() + 300).setDuration(1000);
xAnim.setStartDelay(0);
xAnim.setRepeatCount(0);
xAnim.setRepeatMode(ValueAnimator.REVERSE);
xAnim.setInterpolator(new AccelerateInterpolator(2f));
ObjectAnimator alphaAnim = ObjectAnimator.ofFloat(ball, "alpha", 1f, .5f).
setDuration(1000);
AnimatorSet alphaSeq = new AnimatorSet();
alphaSeq.play(alphaAnim);
animation = new AnimatorSet();
((AnimatorSet) animation).playTogether(yAnim, xAnim);
animation.addListener(this);
}
}
public void startAnimation(boolean endImmediately) {
this.endImmediately = endImmediately;
startText.setAlpha(.5f);
repeatText.setAlpha(.5f);
cancelText.setAlpha(.5f);
endText.setAlpha(.5f);
startTextAnimator.setAlpha(.5f);
repeatTextAnimator.setAlpha(.5f);
cancelTextAnimator.setAlpha(.5f);
endTextAnimator.setAlpha(.5f);
createAnimation();
animation.start();
}
public void cancelAnimation() {
createAnimation();
animation.cancel();
}
public void endAnimation() {
createAnimation();
animation.end();
}
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();
}
public void onAnimationStart(Animator animation) {
if (animation instanceof AnimatorSet) {
startText.setAlpha(1f);
} else {
startTextAnimator.setAlpha(1f);
}
if (endImmediately) {
animation.end();
}
}
public void onAnimationEnd(Animator animation) {
if (animation instanceof AnimatorSet) {
endText.setAlpha(1f);
} else {
endTextAnimator.setAlpha(1f);
}
}
public void onAnimationCancel(Animator animation) {
if (animation instanceof AnimatorSet) {
cancelText.setAlpha(1f);
} else {
cancelTextAnimator.setAlpha(1f);
}
}
public void onAnimationRepeat(Animator animation) {
if (animation instanceof AnimatorSet) {
repeatText.setAlpha(1f);
} else {
repeatTextAnimator.setAlpha(1f);
}
}
}
}
//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"
>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Play"
android:id="@+id/startButton"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel"
android:id="@+id/cancelButton"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End"
android:id="@+id/endButton"
/>
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End Immediately"
android:id="@+id/endCB"
/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Sequencer Events: "
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start "
android:id="@+id/startText"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Repeat "
android:id="@+id/repeatText"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel "
android:id="@+id/cancelText"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End"
android:id="@+id/endText"
/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Animator Events: "
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start "
android:id="@+id/startTextAnimator"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Repeat "
android:id="@+id/repeatTextAnimator"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel "
android:id="@+id/cancelTextAnimator"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End"
android:id="@+id/endTextAnimator"
/>
</LinearLayout>
</LinearLayout>
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