本文介绍了检查哪个方向在运动事件中的Android flinged的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
所以我想检测触摸屏幕时,哪个方向,用户移动他的手指
现在它的工作了3个方向,但涨运动不会被调用。
So i want to detect which direction the user moved his finger when touching the screenRight now its working for 3 directions but the "up" movement does not get called.
这是我的code:
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
// store the X value when the user's finger was pressed down
downXValue = event.getX();
downYValue = event.getY();
break;
}
case MotionEvent.ACTION_UP: {
// Get the X value when the user released his/her finger
float currentX = event.getX();
float currentY = event.getY();
//check if horizontal or vertical movement was bigger
if (Math.abs(downXValue - currentX) > Math.abs(downYValue)
- currentY) {
Log.e("motionevent", "x");
// going backwards: pushing stuff to the right
if (downXValue < currentX) {
Log.e("motionevent", "right");
}
// going forwards: pushing stuff to the left
if (downXValue > currentX) {
Log.e("motionevent", "left");
}
} else {
Log.e("motionevent", "y");
if (downYValue < currentY) {
Log.e("motionevent", "up");
}
if (downYValue > currentY) {
Log.e("motionevent", "down");
}
}
break;
}
}
return true;
}
是否与检查水平或垂直移动的问题吗?因为每当我做一个动作起来,左边或右边被调用。下正常工作。
Is there a Problem with checking for horizontal or vertical movement? because whenever i do an up movement, right or left gets called. down works fine.
推荐答案
您在您的移动计算有错误。我现在已经修好了,其确定。
You have error in your movement calculation. I have fixed it, its ok now.
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
// store the X value when the user's finger was pressed down
downXValue = event.getX();
downYValue = event.getY();
Log.v("", "= " + downYValue);
break;
}
case MotionEvent.ACTION_UP: {
// Get the X value when the user released his/her finger
float currentX = event.getX();
float currentY = event.getY();
// check if horizontal or vertical movement was bigger
if (Math.abs(downXValue - currentX) > Math.abs(downYValue
- currentY)) {
Log.v("", "x");
// going backwards: pushing stuff to the right
if (downXValue < currentX) {
Log.v("", "right");
}
// going forwards: pushing stuff to the left
if (downXValue > currentX) {
Log.v("", "left");
}
} else {
Log.v("", "y ");
if (downYValue < currentY) {
Log.v("", "down");
}
if (downYValue > currentY) {
Log.v("", "up");
}
}
break;
}
}
这篇关于检查哪个方向在运动事件中的Android flinged的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!