class MyOnGestureListener extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onDoubleTap(MotionEvent e) {
addLoveView(e);
return super.onDoubleTap(e);
}
}
private int x1;
private int y1;
private void addLoveView(MotionEvent e) {
float x =e.getRawX();
float y =e.getRawY();
if (x <100) {
x1 =102;
}else {
x1 = (int)x;
}
if (y <100) {
y1 =102;
}else {
y1 = (int)y;
}
if (mLove !=null) {
mLove.addLoveView(x1, y1);
}
}
gestureDetector = new GestureDetector(getContext(), new MyOnGestureListener());
在onTouchEvent時候使用自定義的gestureDetector 記得要 return true
@Override
public boolean onTouchEvent(MotionEvent event) {
gestureDetector.onTouchEvent(event);
return true;
}
自定義RelativeLayout
public class Love extends RelativeLayout {
private Context context;
private LayoutParams params;
private Drawable[] icons = new Drawable[4];
private Interpolator[] interpolators = new Interpolator[4];
private int mWidth;
private int mHeight;
public Love(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
initView();
}
private void initView() {
// 圖片資源
icons[0] = getResources().getDrawable(R.drawable.heart_red);
icons[1] = getResources().getDrawable(R.drawable.heart_red);
icons[2] = getResources().getDrawable(R.drawable.heart_red);
icons[3] = getResources().getDrawable(R.drawable.heart_red);
// 插值器
interpolators[0] = new AccelerateDecelerateInterpolator(); // 在動畫開始與結束的地方速率改變比較慢，在中間的時候加速
interpolators[1] = new AccelerateInterpolator(); // 在動畫開始的地方速率改變比較慢，然後開始加速
interpolators[2] = new DecelerateInterpolator(); // 在動畫開始的地方快然後慢
interpolators[3] = new LinearInterpolator(); // 以常量速率改變
}
public void addLoveView(float x, float y) {
mWidth = (int) (x - 100);
mHeight = (int) (y - 100);
final ImageView iv = new ImageView(context);
params = new LayoutParams(200, 200);
iv.setLayoutParams(params);
iv.setImageDrawable(icons[new Random().nextInt(4)]);
addView(iv);
// 開啓動畫，並且用完銷燬
AnimatorSet set = getAnimatorSet(iv);
set.start();
set.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
// TODO Auto-generated method stub
super.onAnimationEnd(animation);
removeView(iv);
}
});
}
/**
* 獲取動畫集合
*
* @param iv
*/
private AnimatorSet getAnimatorSet(ImageView iv) {
// 1.alpha動畫
ObjectAnimator alpha = ObjectAnimator.ofFloat(iv, "alpha", 0.3f, 1f);
// 2.縮放動畫
ObjectAnimator scaleX = ObjectAnimator.ofFloat(iv, "scaleX", 0.5f, 1.5f);
ObjectAnimator scaleY = ObjectAnimator.ofFloat(iv, "scaleY", 0.5f, 1.5f);
// 動畫集合
AnimatorSet set = new AnimatorSet();
set.playTogether(alpha, scaleX, scaleY);
set.setDuration(2000);
// 貝塞爾曲線動畫
ValueAnimator bzier = getBzierAnimator(iv);
AnimatorSet set2 = new AnimatorSet();
set2.playTogether(set, bzier);
set2.setTarget(iv);
return set2;
}
/**
* 貝塞爾動畫
*/
private ValueAnimator getBzierAnimator(final ImageView iv) {
// TODO Auto-generated method stub
PointF[] PointFs = getPointFs(iv); // 4個點的座標
BasEvaluator evaluator = new BasEvaluator(PointFs[1], PointFs[2]);
ValueAnimator valueAnim = ValueAnimator.ofObject(evaluator, PointFs[0], PointFs[3]);
valueAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
// TODO Auto-generated method stub
PointF p = (PointF) animation.getAnimatedValue();
iv.setX(p.x);
iv.setY(p.y);
iv.setAlpha(1 - animation.getAnimatedFraction()); // 透明度
}
});
valueAnim.setTarget(iv);
valueAnim.setDuration(2000);
valueAnim.setInterpolator(interpolators[new Random().nextInt(4)]);
return valueAnim;
}
private PointF[] getPointFs(ImageView iv) {
// TODO Auto-generated method stub
PointF[] PointFs = new PointF[4];
PointFs[0] = new PointF(); // p0
PointFs[0].x = ((int) mWidth);
PointFs[0].y = mHeight;
PointFs[1] = new PointF(); // p1
PointFs[1].x = new Random().nextInt(mWidth);
PointFs[1].y = new Random().nextInt(mHeight / 2) + mHeight / 2 + params.height;
PointFs[2] = new PointF(); // p2
PointFs[2].x = new Random().nextInt(mWidth);
PointFs[2].y = new Random().nextInt(mHeight / 2);
PointFs[3] = new PointF(); // p3
PointFs[3].x = new Random().nextInt(mWidth);
PointFs[3].y = 0;
return PointFs;
}
}