Java 如何使圆在动画中仅显示一次
我有一个应用程序,可以显示多个圆,并设置半径从0到300的动画。我遇到的问题是,它显示多个圆,每个圆的半径缓慢增加。我只想画一个增加半径的圆。这是我的密码Java 如何使圆在动画中仅显示一次,java,android,animation,view,android-animation,Java,Android,Animation,View,Android Animation,我有一个应用程序,可以显示多个圆,并设置半径从0到300的动画。我遇到的问题是,它显示多个圆,每个圆的半径缓慢增加。我只想画一个增加半径的圆。这是我的密码 public class SplashLaunch extends View{ Handler cool = new Handler(); DrawingView v; Paint newPaint = new Paint(); int randomWidthOne = 0; int randomHei
public class SplashLaunch extends View{
Handler cool = new Handler();
DrawingView v;
Paint newPaint = new Paint();
int randomWidthOne = 0;
int randomHeightOne = 0;
private float radiusOne = 300;
final int redColorOne = Color.RED;
final int greenColorOne = Color.GREEN;
private static int lastColorOne;
ObjectAnimator radiusAnimator;
private final Random theRandom = new Random();
public SplashLaunch(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
private final Runnable circleUpdater = new Runnable() {
@Override
public void run() {
lastColorOne = theRandom.nextInt(2) == 1 ? redColorOne : greenColorOne;
newPaint.setColor(lastColorOne);
startAnimation(100);
cool.postDelayed(this, 1000);
invalidate();
}
};
@Override
protected void onAttachedToWindow(){
super.onAttachedToWindow();
cool.post(circleUpdater);
}
protected void onDetachedFromWindow(){
super.onDetachedFromWindow();
cool.removeCallbacks(circleUpdater);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
if(theRandom == null){
randomWidthOne =(int) (theRandom.nextInt((int) Math.abs(getWidth()-radiusOne/2)) + radiusOne/2f);
randomHeightOne = (theRandom.nextInt((int)Math.abs((getHeight()-radiusOne/2 + radiusOne/2f))));
}else {
randomWidthOne =(int) (theRandom.nextInt((int) Math.abs(getWidth()-radiusOne/2)) + radiusOne/2f);
randomHeightOne = (theRandom.nextInt((int)Math.abs((getHeight()-radiusOne/2 + radiusOne/2f))));
}
canvas.drawCircle(randomWidthOne, randomHeightOne, radiusOne, newPaint);
}
public void setRadiusOne(float value){
this.radiusOne = value;
invalidate();
}
public int startAnimation(int animationDuration) {
if (radiusAnimator == null || !radiusAnimator.isRunning()) {
// Define what value the radius is supposed to have at specific time values
Keyframe kf0 = Keyframe.ofFloat(0f, 0f);
Keyframe kf2 = Keyframe.ofFloat(0.5f, 180f);
Keyframe kf1 = Keyframe.ofFloat(1f, 360f);
// If you pass in the radius, it will be calling setRadius method, so make sure you have it!!!!!
PropertyValuesHolder pvhRotation = PropertyValuesHolder.ofKeyframe("radiusOne", kf0, kf1, kf2);
radiusAnimator = ObjectAnimator.ofPropertyValuesHolder(this, pvhRotation);
radiusAnimator.setInterpolator(new LinearInterpolator());
radiusAnimator.setDuration(animationDuration);
radiusAnimator.start();
}
else {
Log.d("Circle", "I am already running!");
}
return animationDuration;
}
public void stopAnimation() {
if (radiusAnimator != null) {
radiusAnimator.cancel();
radiusAnimator = null;
}
}
public boolean getAnimationRunning() {
return radiusAnimator != null && radiusAnimator.isRunning();
}
}
试用
canvas.drawColor(Color.WHITE);
用于清除super.onDraw(画布)后的整个视图显示 这些圆是在屏幕上的随机位置绘制的,因此这将在顶部绘制一个半径为x的圆,或者在屏幕底部绘制另一个半径大于x的圆,如果您的app min sdk版本>=Honeycouse use或其任何子类,那么这实际上不会做任何事情。不需要实现处理程序。如果您使用处理程序,可能会导致内存泄漏。我不明白。^这对我一点帮助都没有