使用Android检测长按

时间：2011-10-27 17:25:10

标签： java android touchscreen long-click

我目前正在使用

onTouchEvent(MotionEvent event){
}

检测用户何时按下我的glSurfaceView是否有办法检测何时进行长按。我猜我是否在开发文档中找不到多少，那么它将是某种方法的工作。类似于注册ACTION_DOWN并查看ACTION_UP之前的时间。

如何使用opengl-es检测Android上的长按？

11 个答案:

答案 0 :(得分：145)

GestureDetector 是最佳解决方案。

这是一个有趣的选择。在每个 ACTION_DOWN 上的 onTouchEvent 中安排Runnable在1秒内运行。在每个 ACTION_UP 或 ACTION_MOVE 上，取消预定的Runnable。如果从 ACTION_DOWN 事件中取消的次数少于1秒，则Runnable将无法运行。

final Handler handler = new Handler(); 
Runnable mLongPressed = new Runnable() { 
    public void run() { 
        Log.i("", "Long press!");
    }   
};

@Override
public boolean onTouchEvent(MotionEvent event, MapView mapView){
    if(event.getAction() == MotionEvent.ACTION_DOWN)
        handler.postDelayed(mLongPressed, ViewConfiguration.getLongPressTimeout());
    if((event.getAction() == MotionEvent.ACTION_MOVE)||(event.getAction() == MotionEvent.ACTION_UP))
        handler.removeCallbacks(mLongPressed);
    return super.onTouchEvent(event, mapView);
}

答案 1 :(得分：101)

试试这个：

final GestureDetector gestureDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener() {
    public void onLongPress(MotionEvent e) {
        Log.e("", "Longpress detected");
    }
});

public boolean onTouchEvent(MotionEvent event) {
    return gestureDetector.onTouchEvent(event);
};

答案 2 :(得分：5)

我有一个代码可以检测到点击，长按和移动。 它完全是上面给出的答案和我偷窥每个文档页面所做的更改的组合。 

//Declare this flag globally
boolean goneFlag = false;

//Put this into the class
final Handler handler = new Handler(); 
    Runnable mLongPressed = new Runnable() { 
        public void run() { 
            goneFlag = true;
            //Code for long click
        }   
    };

//onTouch code
@Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {    
        case MotionEvent.ACTION_DOWN:
            handler.postDelayed(mLongPressed, 1000);
            //This is where my code for movement is initialized to get original location.
            break;
        case MotionEvent.ACTION_UP:
            handler.removeCallbacks(mLongPressed);
            if(Math.abs(event.getRawX() - initialTouchX) <= 2 && !goneFlag) {
                //Code for single click
                return false;
            }
            break;
        case MotionEvent.ACTION_MOVE:
            handler.removeCallbacks(mLongPressed);
            //Code for movement here. This may include using a window manager to update the view
            break;
        }
        return true;
    }

我确认它在我自己的应用程序中使用它。

答案 3 :(得分：3)

当您的意思是用户按下时，您的意思是点击吗？点击是指用户按下然后立即抬起手指。因此它包含两个onTouch事件。你应该保存onTouchEvent用于初始触摸或发布后发生的事情。

因此，如果是单击，则应该使用onClickListener。

您的回答类似：使用onLongClickListener。

答案 4 :(得分：1)

MSquare的解决方案只有在您拥有特定像素时才有效，但这对最终用户来说是不合理的期望，除非他们使用鼠标（他们不会使用鼠标）。

所以我为DOWN和UP动作之间的距离添加了一点阈值，以防中间有MOVE动作。

final Handler longPressHandler = new Handler();
Runnable longPressedRunnable = new Runnable() {
    public void run() {
        Log.e(TAG, "Long press detected in long press Handler!");
        isLongPressHandlerActivated = true;
    }
};

private boolean isLongPressHandlerActivated = false;

private boolean isActionMoveEventStored = false;
private float lastActionMoveEventBeforeUpX;
private float lastActionMoveEventBeforeUpY;

@Override
public boolean dispatchTouchEvent(MotionEvent event) {
    if(event.getAction() == MotionEvent.ACTION_DOWN) {
        longPressHandler.postDelayed(longPressedRunnable, 1000);
    }
    if(event.getAction() == MotionEvent.ACTION_MOVE || event.getAction() == MotionEvent.ACTION_HOVER_MOVE) {
        if(!isActionMoveEventStored) {
            isActionMoveEventStored = true;
            lastActionMoveEventBeforeUpX = event.getX();
            lastActionMoveEventBeforeUpY = event.getY();
        } else {
            float currentX = event.getX();
            float currentY = event.getY();
            float firstX = lastActionMoveEventBeforeUpX;
            float firstY = lastActionMoveEventBeforeUpY;
            double distance = Math.sqrt(
                    (currentY - firstY) * (currentY - firstY) + ((currentX - firstX) * (currentX - firstX)));
            if(distance > 20) {
                longPressHandler.removeCallbacks(longPressedRunnable);
            }
        }
    }
    if(event.getAction() == MotionEvent.ACTION_UP) {
        isActionMoveEventStored = false;
        longPressHandler.removeCallbacks(longPressedRunnable);
        if(isLongPressHandlerActivated) {
            Log.d(TAG, "Long Press detected; halting propagation of motion event");
            isLongPressHandlerActivated = false;
            return false;
        }
    }
    return super.dispatchTouchEvent(event);
}

答案 5 :(得分：1)

我创建了一个snippet - 受到实际视图源的启发 - 可以通过自定义延迟可靠地检测长按/按下。但它在Kotlin：

val LONG_PRESS_DELAY = 500

val handler = Handler()
var boundaries: Rect? = null

var onTap = Runnable {
    handler.postDelayed(onLongPress, LONG_PRESS_DELAY - ViewConfiguration.getTapTimeout().toLong())
}

var onLongPress = Runnable {

    // Long Press
}

override fun onTouch(view: View, event: MotionEvent): Boolean {
    when (event.action) {
        MotionEvent.ACTION_DOWN -> {
            boundaries = Rect(view.left, view.top, view.right, view.bottom)
            handler.postDelayed(onTap, ViewConfiguration.getTapTimeout().toLong())
        }
        MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
            handler.removeCallbacks(onLongPress)
            handler.removeCallbacks(onTap)
        }
        MotionEvent.ACTION_MOVE -> {
            if (!boundaries!!.contains(view.left + event.x.toInt(), view.top + event.y.toInt())) {
                handler.removeCallbacks(onLongPress)
                handler.removeCallbacks(onTap)
            }
        }
    }
    return true
}

答案 6 :(得分：1)

这个想法是为将来执行长按一次创建Runnable，但是由于点击或移动，可以取消此执行。

您还需要知道，当长时间点击消耗时，以及因为手指移动太多而取消时。我们使用initialTouchX＆amp; initialTouchY用于检查用户是否退出10像素的正方形区域，每边5个。

以下是我的委托 Click＆amp; amp;的完整代码从Cell ListView Activity OnTouchListener ClickDelegate delegate; boolean goneFlag = false; float initialTouchX; float initialTouchY; final Handler handler = new Handler(); Runnable mLongPressed = new Runnable() { public void run() { Log.i("TOUCH_EVENT", "Long press!"); if (delegate != null) { goneFlag = delegate.onItemLongClick(index); } else { goneFlag = true; } } }; @OnTouch({R.id.layout}) public boolean onTouch (View view, MotionEvent motionEvent) { switch (motionEvent.getAction()) { case MotionEvent.ACTION_DOWN: handler.postDelayed(mLongPressed, ViewConfiguration.getLongPressTimeout()); initialTouchX = motionEvent.getRawX(); initialTouchY = motionEvent.getRawY(); return true; case MotionEvent.ACTION_MOVE: case MotionEvent.ACTION_CANCEL: if (Math.abs(motionEvent.getRawX() - initialTouchX) > 5 || Math.abs(motionEvent.getRawY() - initialTouchY) > 5) { handler.removeCallbacks(mLongPressed); return true; } return false; case MotionEvent.ACTION_UP: handler.removeCallbacks(mLongPressed); if (goneFlag || Math.abs(motionEvent.getRawX() - initialTouchX) > 5 || Math.abs(motionEvent.getRawY() - initialTouchY) > 5) { goneFlag = false; return true; } break; } Log.i("TOUCH_EVENT", "Short press!"); if (delegate != null) { if (delegate.onItemClick(index)) { return false; } } return false; } 点击： 

ClickDelegate

interface是Activity，用于将点击事件发送到处理程序类，如 public interface ClickDelegate { boolean onItemClick(int position); boolean onItemLongClick(int position); } 

Activity

如果您需要委派行为，那么您需要的是在View或父public class MyActivity extends Activity implements ClickDelegate { //code... //in some place of you code like onCreate, //you need to set the delegate like this: SomeArrayAdapter.delegate = this; //or: SomeViewHolder.delegate = this; //or: SomeCustomView.delegate = this; @Override public boolean onItemClick(int position) { Object obj = list.get(position); if (obj) { return true; //if you handle click } else { return false; //if not, it could be another event } } @Override public boolean onItemLongClick(int position) { Object obj = list.get(position); if (obj) { return true; //if you handle long click } else { return false; //if not, it's a click } } } 中实施它：

  log_level_per_component:
    type: object
    example:
      {
       "Component1": "Info",
       "Component2": "Debug",
       "Component3": "Fatal"
      }

答案 7 :(得分：0)

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

                int action = MotionEventCompat.getActionMasked(event);


                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        longClick = false;
                        x1 = event.getX();
                        break;

                    case MotionEvent.ACTION_MOVE:
                        if (event.getEventTime() - event.getDownTime() > 500 && Math.abs(event.getX() - x1) < MIN_DISTANCE) {
                            longClick = true;
                        }
                        break;

                    case MotionEvent.ACTION_UP:
                                if (longClick) {
                                    Toast.makeText(activity, "Long preess", Toast.LENGTH_SHORT).show();
                                } 
                }
                return true;
            }
        });

答案 8 :(得分：0)

这是一种基于MSquare的检测长按按钮的好主意的方法，它具有一个附加功能：不仅响应长按执行操作，而且还会重复操作，直到MotionEvent。收到ACTION_UP消息。在这种情况下，长按和短按动作相同，但是可以不同。

请注意，正如其他人所报告的那样，由于对MotionEvent.ACTION_MOVE消息的响应而删除了回调，因为我无法保持足够的静止感，从而阻止了回调的执行。我通过忽略该消息来解决该问题。 

private void setIncrementButton() {
    final Button btn = (Button) findViewById(R.id.btn);
    final Runnable repeater = new Runnable() {
        @Override
        public void run() {
            increment();
            final int milliseconds = 100;
            btn.postDelayed(this, milliseconds);
        }
    };
    btn.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == MotionEvent.ACTION_DOWN) {
                increment();
                v.postDelayed(repeater, ViewConfiguration.getLongPressTimeout());
            } else if (e.getAction() == MotionEvent.ACTION_UP) {
                v.removeCallbacks(repeater);
            }
            return true;
        }
    });
}

private void increment() {
    Log.v("Long Press Example", "TODO: implement increment operation");   
}

答案 9 :(得分：0)

我找到了一个解决方案，它不需要定义可运行的东西或其他东西，并且工作正常。

    var lastTouchTime: Long = 0

    // ( ViewConfiguration.#.DEFAULT_LONG_PRESS_TIMEOUT =500)
    val longPressTime = 500

    var lastTouchX = 0f
    var lastTouchY = 0f

    view.setOnTouchListener { v, event ->

        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                lastTouchTime = SystemClock.elapsedRealtime()
                lastTouchX = event.x
                lastTouchY = event.y
                return@setOnTouchListener true
            }
            MotionEvent.ACTION_UP -> {
                if (SystemClock.elapsedRealtime() - lastTouchTime > longPressTime
                        && Math.abs(event.x - lastTouchX) < 3
                        && Math.abs(event.y - lastTouchY) < 3) {
                    Log.d(TAG, "Long press")
                }
                return@setOnTouchListener true
            }
            else -> {
                return@setOnTouchListener false
            }
        }

    }

答案 10 :(得分：0)

选项：自定义检测器class 

abstract public class
Long_hold
extends View.OnTouchListener
{
  public@Override boolean
  onTouch(View view, MotionEvent touch)
  {
    switch(touch.getAction())
    {
    case ACTION_DOWN: down(touch); return true;
    case ACTION_MOVE: move(touch);
    }
    return true;
  }

  private long
  time_0;
  private float
  x_0, y_0;

  private void
  down(MotionEvent touch)
  {
    time_0= touch.getEventTime();
    x_0= touch.getX();
    y_0= touch.getY();
  }

  private void
  move(MotionEvent touch)
  {
    if(held_too_short(touch) {return;}
    if(moved_too_much(touch)) {return;}

    long_press(touch);
  }
  abstract protected void
  long_hold(MotionEvent touch);
}

使用

private double
moved_too_much(MotionEvent touch)
{
  return Math.hypot(
      x_0 -touch.getX(),
      y_0 -touch.getY()) >TOLERANCE;
}

private double
held_too_short(MotionEvent touch)
{
  return touch.getEventTime()-time_0 <DOWN_PERIOD;
}

其中

  • TOLERANCE是最大容许运动

  • DOWN_PERIOD是必须按下的时间

import 

static android.view.MotionEvent.ACTION_MOVE;
static android.view.MotionEvent.ACTION_DOWN;

用代码

setOnTouchListener(new Long_hold()
  {
  protected@Override boolean
  long_hold(MotionEvent touch)
  {
    /*your code on long hold*/
  }
});
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