Android - 如何检测屏幕上的触摸是 "scroll" 触摸?

Android - how to detect a touch on screen is a "scroll" touch?

我正在 Java 中创建一个 android 应用程序,其中屏幕周围有很多 <TextView>,所有这些都定义了 onTouchListeners。它们被包裹在 <ScrollView> 中,因为它们占用的空间 space 多于屏幕上可用的空间。

我的问题是:当我滚动应用程序时,up/down,通过触摸屏幕并移动我的手指 up/down,滚动按预期工作,但触摸的 onTouchListener <TextView> 也被解雇了(这可能也是预料之中的)——不过我不希望这种情况发生。我希望在触摸屏幕滚动时忽略 onTouchListener。

我怎样才能做到这一点?当用户滚动并且 "accidentally" 在某个 <TextView>.

上触发 onTouchListener 时,我不希望我的函数 运行

你可以这样识别移动动作:

view.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {

            if(event.getAction() == MotionEvent.ACTION_MOVE)
            {

            }

            return false;
        }
    });

经过更多搜索,我找到了 Stimsoni 的 this solution。这个想法是检查 ACTION_DOWNACTION_UP 事件之间的时间是否低于或高于 ViewConfiguration.getTapTimeout().

给出的值

来自文档:

[Returns] the duration in milliseconds we will wait to see if a touch event is a tap or a scroll. If the user does not move within this interval, it is considered to be a tap.

代码:

view.setOnTouchListener(new OnTouchListener() {

    private long startClickTime;

    @Override
    public boolean onTouch(View view, MotionEvent event) {

        if (event.getAction() == MotionEvent.ACTION_DOWN) {

            startClickTime = System.currentTimeMillis();

        } else if (event.getAction() == MotionEvent.ACTION_UP) {

            if (System.currentTimeMillis() - startClickTime < ViewConfiguration.getTapTimeout()) {

                // Touch was a simple tap. Do whatever.

            } else {

                // Touch was a not a simple tap.

            }

        }

        return true;
    }

});

我遇到了和你一样的问题,我用ACTION_CANCEL解决了。

motionEvent.getActionMasked() 等于 ACTION_CANCEL 之前感知到的动作(如 ACTION_DOWN 在你的情况下)现在是 "canceled" 其他手势,如滚动等。你的代码可能是这样的:

view.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent e) {
        if (e.getActionMasked() == MotionEvent.ACTION_DOWN) {
            // perceive a touch action.
        } else if(e.getActionMasked() == MotionEvent.ACTION_UP ||
                e.getActionMasked() == MotionEvent.ACTION_CANCEL) {
            // ignore the perceived action.      
        }
    }

希望对您有所帮助。

我有一个类似的问题,但使用一个 TextView,搜索将我带到这里。文本内容可能会占用比屏幕上更多的 space。 简单的工作示例:bpmcounter-android (Kotlin)

class MainActivity : AppCompatActivity() {

    inner class GestureTap : GestureDetector.SimpleOnGestureListener() {
        override fun onSingleTapUp(e: MotionEvent?): Boolean {
            // Do your buttonClick stuff here. Any scrolling action will be ignored
            return true
        }
    }

    @SuppressLint("ClickableViewAccessibility")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val textView = findViewById<TextView>(R.id.textView)
        textView.movementMethod = ScrollingMovementMethod()
        val gestureDetector = GestureDetector(this, GestureTap())
        textView.setOnTouchListener { _, event -> gestureDetector.onTouchEvent(event) }
    }
}

1 方法:

我发现执行此操作的最佳方法是检测保存点 x 和 y 的第一次触摸,然后再进行第二次触摸。如果第一次点击和第二次点击之间的距离很近(我将 10% 作为近似值),那么只需点击一下即可触摸,否则就是滚动。

 /**
 * determine whether two numbers are "approximately equal" by seeing if they
 * are within a certain "tolerance percentage," with `tolerancePercentage` given
 * as a percentage (such as 10.0 meaning "10%").
 *
 * @param tolerancePercentage 1 = 1%, 2.5 = 2.5%, etc.
 */
fun approximatelyEqual(desiredValue: Float, actualValue: Float, tolerancePercentage: Float): Boolean {
    val diff = Math.abs(desiredValue - actualValue) //  1000 - 950  = 50
    val tolerance = tolerancePercentage / 100 * desiredValue //  20/100*1000 = 200
    return diff < tolerance //  50<200      = true
}

var xPoint = 0f
var yPoint = 0f
@SuppressLint("ClickableViewAccessibility")
override fun onTouchEvent(event: MotionEvent): Boolean {
    when(event.action) {

        MotionEvent.ACTION_DOWN -> {
            xPoint = event.x
            yPoint = event.y
            return true
        }

        MotionEvent.ACTION_UP -> {
            if (!approximatelyEqual(xPoint, event.x, 10f) || !approximatelyEqual(yPoint, event.y, 10f)) {
                //scrolling
            } else {
                //simple click
            }
        }
    }
    return false
}

2 方法:

做同样事情的另一种方法是使用 GestureDetector class:

   interface GestureInterface {
    fun setOnScroll(e1: MotionEvent, e2: MotionEvent, distanceX: Float, distanceY: Float)
    fun onClick(e: MotionEvent)
}

class MyGestureDetector(val gestureInterfacePar: GestureInterface) : SimpleOnGestureListener() {

    override fun onSingleTapUp(e: MotionEvent): Boolean { 
        gestureInterfacePar.onClick(e)
        return false
    }

    override fun onLongPress(e: MotionEvent) {}
    override fun onDoubleTap(e: MotionEvent): Boolean {
        return false
    }

    override fun onDoubleTapEvent(e: MotionEvent): Boolean {
        return false
    }

    override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
        return false
    }

    override fun onShowPress(e: MotionEvent) {
    }

    override fun onDown(e: MotionEvent): Boolean { 
        return true
    }

    override fun onScroll(e1: MotionEvent, e2: MotionEvent, distanceX: Float, distanceY: Float): Boolean {
        gestureInterfacePar.setOnScroll(e1, e2, distanceX, distanceY)
        return false
    }

    override fun onFling(e1: MotionEvent, e2: MotionEvent, velocityX: Float, velocityY: Float): Boolean { 
        return super.onFling(e1, e2, velocityX, velocityY)
    }
}

最后,将其与您的视图绑定:

val mGestureDetector = GestureDetector(context, MyGestureDetector(object : GestureInterface {
                override fun setOnScroll(e1: MotionEvent, e2: MotionEvent, distanceX: Float, distanceY: Float) {
                    //handle the scroll
                }

                override fun onClick(e: MotionEvent) {
                    //handle the single click
                }

            }))


            view.setOnTouchListener(OnTouchListener { v, event -> mGestureDetector.onTouchEvent(event) })

为我工作:

View.OnTouchListener() {

@Override

public boolean onTouch(View v,MotionEvent event)
{
        if(event.getAction()!=MotionEvent.ACTION_DOWN)
        {
                     // Before touch
        }
        else {
                      // When touched
             }

  return true
});

您无需采用如此复杂的方法来捕获“点击”事件。仅适用于此方法:-

//当然在触摸侦听器内部:-

科特林:-

if(event.action == MotionEvent.ACTION_UP && event.action != MotionEvent.ACTION_MOVE) {
// Click has been made...
// Some code
}

JAVA :- 只需将 event.action 替换为 event.getAction()

这对我有用