The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
* Copyright (C) 2010 The Android开源工程
*
* 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.Animator;
import android.animation.ObjectAnimator;
import android.widget.CheckBox;
import android.widget.TextView;
import com.example.android.apis.R;
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;
/**
* This demo shows how the AnimatorListener events work.
*/
public class AnimatorEvents extends Activity {
TextView startText, repeatText, cancelText, endText;
TextView startTextAnimator, repeatTextAnimator, cancelTextAnimator, endTextAnimator;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.animator_events);
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);
}
}
}
}