我有我想旋转的圆。我正在使用SimpleOnGestureListener来处理手势,尤其是onScroll方法。使用SimpleOnGestureListener进行Android平滑旋转
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
float lWidth = e1.getX() - centeralPointX;
float lHeight = e1.getY() - centeralPointY;
float lRadius = FloatMath.sqrt(lWidth * lWidth + lHeight * lHeight);
if ((lRadius <= bigCircleRadius) && (lRadius >= smallCircleRadius)) {
mLastAngle = (float) (Math.atan(lHeight/lWidth) * 180/Math.PI)
+ step/2;
float currWidth = e2.getX() - centeralPointX;
float currHeight = e2.getY() - centeralPointY;
mCurrentAngle = (float) (Math.atan(currHeight/currWidth) * 180/Math.PI)
+ step/2;
mAngle = mLastAngle - mCurrentAngle;
mLastAngle = mCurrentAngle;
// show angles
TextView lastANGLE, endANGLE, ANGLE;
lastANGLE = (TextView) findViewById(R.id.currentAngle);
lastANGLE.setText("last " + mLastAngle);
endANGLE = (TextView) findViewById(R.id.endAngle);
ANGLE = (TextView) findViewById(R.id.angle);
endANGLE.setText("current " + mCurrentAngle);
ANGLE.setText("ANGLE " + mAngle);
rotation = (float) (-mAngle - step/2);
if (rotate != null && !rotate.hasEnded()) {
rotate.cancel();
rotate.reset();
}
rotate = RotateCircle(radius, radius);
words_layout.startAnimation(rotate);
return true;
} else
return false;
}
但它无法正常工作。我希望那个圈子可以顺利旋转,但不会。 我该怎么做?我试图使用onFling方法,但它在运动结束后旋转我的圆。但我需要在移动过程中旋转它。