AnimationSeeking 展示了 我们可以 自己设置动画播放的时间(也就是小球开始播放时候的状态 , 本案例是小球的y位置)
/*** 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 AnimationSeeking extends Activity {private static final int DURATION = 5000;private SeekBar mSeekBar;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.animation_seeking);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();}});mSeekBar = (SeekBar) findViewById(R.id.seekBar);mSeekBar.setMax(DURATION);mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {public void onStopTrackingTouch(SeekBar seekBar) {}public void onStartTrackingTouch(SeekBar seekBar) {}public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// prevent seeking on app creationif (animView.getHeight() != 0) {animView.seek(progress);}}});}public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener, Animator.AnimatorListener {private static final int RED = 0xffFF8080;private static final int BLUE = 0xff8080FF;private static final int CYAN = 0xff80ffff;private static final int GREEN = 0xff80ff80;private static final float BALL_SIZE = 100f;public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();AnimatorSet animation = null;ValueAnimator bounceAnim = null;ShapeHolder ball = null;public MyAnimationView(Context context) {super(context);ball = addBall(200, 0);}private void createAnimation() {if (bounceAnim == null) {bounceAnim = ObjectAnimator.ofFloat(ball, "y",ball.getY(), getHeight() - BALL_SIZE).setDuration(DURATION);bounceAnim.setInterpolator(new CycleInterpolator(2));//循环加速器,执行两次bounceAnim.addUpdateListener(this);}}public void startAnimation() {createAnimation();bounceAnim.start();}public void seek(long seekTime) {createAnimation();bounceAnim.setCurrentPlayTime(seekTime); //设置当前当前动画从什么时间开始播放}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;}@Overrideprotected void onDraw(Canvas canvas) {canvas.translate(ball.getX(), ball.getY());ball.getShape().draw(canvas);}public void onAnimationUpdate(ValueAnimator animation) {invalidate();long playtime = bounceAnim.getCurrentPlayTime();//可以获取当前的播放时间mSeekBar.setProgress((int)playtime);}public void onAnimationCancel(Animator animation) {}public void onAnimationEnd(Animator animation) {balls.remove(((ObjectAnimator)animation).getTarget());}public void onAnimationRepeat(Animator animation) {}public void onAnimationStart(Animator animation) {}}
}可以监听到 animator的 开始 结束 取消 重复 等事件
/*** This demo shows how the AnimatorListener events work.*/
public class AnimatorEvents extends Activity {private static final int OFF = 0x77FFFFFF;private static final int ON = 0xFFFFFFFF;TextView startText, repeatText, cancelText, endText;TextView startTextAnimator, repeatTextAnimator, cancelTextAnimator, endTextAnimator;@Overridepublic 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.setTextColor(OFF);repeatText = (TextView) findViewById(R.id.repeatText);repeatText.setTextColor(OFF);cancelText = (TextView) findViewById(R.id.cancelText);cancelText.setTextColor(OFF);endText = (TextView) findViewById(R.id.endText);endText.setTextColor(OFF);startTextAnimator = (TextView) findViewById(R.id.startTextAnimator);startTextAnimator.setTextColor(OFF);repeatTextAnimator = (TextView) findViewById(R.id.repeatTextAnimator);repeatTextAnimator.setTextColor(OFF);cancelTextAnimator = (TextView) findViewById(R.id.cancelTextAnimator);cancelTextAnimator.setTextColor(OFF);endTextAnimator = (TextView) findViewById(R.id.endTextAnimator);endTextAnimator.setTextColor(OFF);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 , alphaSeq);animation.addListener(this);}}public void startAnimation(boolean endImmediately) {this.endImmediately = endImmediately;startText.setTextColor(OFF);repeatText.setTextColor(OFF);cancelText.setTextColor(OFF);endText.setTextColor(OFF);startTextAnimator.setTextColor(OFF);repeatTextAnimator.setTextColor(OFF);cancelTextAnimator.setTextColor(OFF);endTextAnimator.setTextColor(OFF);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;}@Overrideprotected void onDraw(Canvas canvas) {canvas.save();canvas.translate(ball.getX(), ball.getY());ball.getShape().draw(canvas);canvas.restore();}public void onAnimationUpdate(ValueAnimator animation) {invalidate();}/*** 也可以监听到 animator的 开始 结束 取消 重复 等事件*/public void onAnimationStart(Animator animation) {if (animation instanceof AnimatorSet) {startText.setTextColor(ON);} else {startTextAnimator.setTextColor(ON);}if (endImmediately) {animation.end();}}public void onAnimationEnd(Animator animation) {if (animation instanceof AnimatorSet) {endText.setTextColor(ON);} else {endTextAnimator.setTextColor(ON);}}public void onAnimationCancel(Animator animation) {if (animation instanceof AnimatorSet) {cancelText.setTextColor(ON);} else {cancelTextAnimator.setTextColor(ON);}}public void onAnimationRepeat(Animator animation) {if (animation instanceof AnimatorSet) {repeatText.setTextColor(ON);} else {repeatTextAnimator.setTextColor(ON);}}}
}