如何在android中获取触摸位置？
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How to get the Touch position in android?
提问by Alex
I need to get the touch begin position (X, Y) , touch move position and touch end position of the screen in android.
我需要在android中获取屏幕的触摸开始位置（X，Y），触摸移动位置和触摸结束位置。
回答by dbrettschneider
@Override
public boolean onTouchEvent(MotionEvent event)
{
int x = (int)event.getX();
int y = (int)event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
}
return false;
}
The three cases are so that you can react to different types of events, in this example tapping or dragging or lifting the finger again.
这三种情况使您可以对不同类型的事件做出反应，在此示例中再次点击或拖动或抬起手指。
回答by Suragch
Supplemental answer
补充答案
Given an OnTouchListener
给定一个 OnTouchListener
private View.OnTouchListener handleTouch = new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Log.i("TAG", "touched down");
break;
case MotionEvent.ACTION_MOVE:
Log.i("TAG", "moving: (" + x + ", " + y + ")");
break;
case MotionEvent.ACTION_UP:
Log.i("TAG", "touched up");
break;
}
return true;
}
};
set on some view:
在某些视图上设置：
myView.setOnTouchListener(handleTouch);
This gives you the touch event coordinates relative to the view that has the touch listener assigned to it. The top left corner of the view is (0, 0). If you move your finger above the view, then ywill be negative. If you move your finger left of the view, then xwill be negative.
这为您提供了相对于分配有触摸侦听器的视图的触摸事件坐标。视图的左上角是(0, 0)。如果您将手指移到视图上方，则为y负值。如果您将手指移到视图左侧，则为x负值。
int x = (int)event.getX();
int y = (int)event.getY();
If you want the coordinates relative to the top left corner of the device screen, then use the raw values.
如果您想要相对于设备屏幕左上角的坐标，请使用原始值。
int x = (int)event.getRawX();
int y = (int)event.getRawY();
Related
有关的
回答by Sephy
@Override
public boolean onTouch(View v, MotionEvent event) {
float x = event.getX();
float y = event.getY();
return true;
}
回答by cjung
Here is the Koltin style, I use this in my project and it works very well:
这是 Koltin 风格，我在我的项目中使用它并且效果很好：
this.yourview.setOnTouchListener(View.OnTouchListener { _, event ->
val x = event.x
val y = event.y
when(event.action) {
MotionEvent.ACTION_DOWN -> {
Log.d(TAG, "ACTION_DOWN \nx: $x\ny: $y")
}
MotionEvent.ACTION_MOVE -> {
Log.d(TAG, "ACTION_MOVE \nx: $x\ny: $y")
}
MotionEvent.ACTION_UP -> {
Log.d(TAG, "ACTION_UP \nx: $x\ny: $y")
}
}
return@OnTouchListener true
})
