android在按住按钮时重复操作
我想在按住按钮时执行重复操作。示例:当用户单击并按住按钮时,它应该在固定的时间间隔内反复调用类似的方法,直到用户将手指从按钮上移开 您可以为该视图注册一个android在按住按钮时重复操作,android,Android,我想在按住按钮时执行重复操作。示例:当用户单击并按住按钮时,它应该在固定的时间间隔内反复调用类似的方法,直到用户将手指从按钮上移开 您可以为该视图注册一个视图。OnKeyListener。请注意,最好取消此类回调,否则,如果您的方法做了一些稍微“沉重”的事情,UI将不会平滑。尽管这不是一个好主意。这可以通过在onKeyDown上启动计时器来完成,在您将光标移动一步并重新启动计时器的时间间隔内启动计时器。然后可以取消onKeyUp事件上的计时器。这在其他系统上的工作方式通常是先按下第一个键,然后稍
视图。OnKeyListener
。请注意,最好取消此类回调,否则,如果您的方法做了一些稍微“沉重”的事情,UI将不会平滑。尽管这不是一个好主意。这可以通过在onKeyDown
上启动计时器来完成,在您将光标移动一步并重新启动计时器的时间间隔内启动计时器。然后可以取消onKeyUp
事件上的计时器。这在其他系统上的工作方式通常是先按下第一个键,然后稍等片刻,以确保用户确实按住了按钮。。。然后重复可以快一点。想象一个键盘自动重复。这应该可以工作,并且不会对ui线程产生负面影响。有多种方法可以实现这一点,但一个非常简单的方法是在处理程序上发布可运行的,并有一定的延迟。在它最基本的形式中,它看起来有点像这样:
Button button = (Button) findViewById(R.id.button);
button.setOnTouchListener(new View.OnTouchListener() {
private Handler mHandler;
@Override public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (mHandler != null) return true;
mHandler = new Handler();
mHandler.postDelayed(mAction, 500);
break;
case MotionEvent.ACTION_UP:
if (mHandler == null) return true;
mHandler.removeCallbacks(mAction);
mHandler = null;
break;
}
return false;
}
Runnable mAction = new Runnable() {
@Override public void run() {
System.out.println("Performing action...");
mHandler.postDelayed(this, 500);
}
};
});
这个想法非常简单:当“向下”触摸动作发生时,在处理程序上发布一个Runnable
,其中包含重复动作。在此之后,在“向上”触摸操作完成之前,不要再次发布Runnable
。Runnable
将继续将自身发布到处理程序中(“向下”触摸操作仍在发生),直到它被触摸操作删除-这就是启用“重复”功能的原因
根据按钮的实际行为及其所追求的onclick/ontouch,您可能希望毫不延迟地完成最初的post 这里是另一种方法,以防您使用普通视图单击。如果是这样,当您释放视图时,将调用click listener。因此,我利用长时间单击侦听器来完成第一部分
button.setOnLongClickListener(new OnLongClickListener() {
private Handler mHandler;
@Override
public boolean onLongClick(View view) {
final Runnable mAction = new Runnable() {
@Override
public void run() {
//do something here
mHandler.postDelayed(this, 1000);
}
};
mHandler = new Handler();
mHandler.postDelayed(mAction, 0);
button.setOnTouchListener(new View.OnTouchListener() {
@SuppressLint("ClickableViewAccessibility")
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
if (mHandler == null) return true;
mHandler.removeCallbacks(mAction);
mHandler = null;
button.setOnTouchListener(null);
return false;
}
return false;
}
});
return true;
}
});
这是一个更独立的实现,可用于任何支持触摸事件的视图
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
/**
* A class, that can be used as a TouchListener on any view (e.g. a Button).
* It cyclically runs a clickListener, emulating keyboard-like behaviour. First
* click is fired immediately, next one after the initialInterval, and subsequent
* ones after the normalInterval.
*
* <p>Interval is scheduled after the onClick completes, so it has to run fast.
* If it runs slow, it does not generate skipped onClicks. Can be rewritten to
* achieve this.
*/
public class RepeatListener implements OnTouchListener {
private Handler handler = new Handler();
private int initialInterval;
private final int normalInterval;
private final OnClickListener clickListener;
private View touchedView;
private Runnable handlerRunnable = new Runnable() {
@Override
public void run() {
if(touchedView.isEnabled()) {
handler.postDelayed(this, normalInterval);
clickListener.onClick(touchedView);
} else {
// if the view was disabled by the clickListener, remove the callback
handler.removeCallbacks(handlerRunnable);
touchedView.setPressed(false);
touchedView = null;
}
}
};
/**
* @param initialInterval The interval after first click event
* @param normalInterval The interval after second and subsequent click
* events
* @param clickListener The OnClickListener, that will be called
* periodically
*/
public RepeatListener(int initialInterval, int normalInterval,
OnClickListener clickListener) {
if (clickListener == null)
throw new IllegalArgumentException("null runnable");
if (initialInterval < 0 || normalInterval < 0)
throw new IllegalArgumentException("negative interval");
this.initialInterval = initialInterval;
this.normalInterval = normalInterval;
this.clickListener = clickListener;
}
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
handler.removeCallbacks(handlerRunnable);
handler.postDelayed(handlerRunnable, initialInterval);
touchedView = view;
touchedView.setPressed(true);
clickListener.onClick(view);
return true;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
handler.removeCallbacks(handlerRunnable);
touchedView.setPressed(false);
touchedView = null;
return true;
}
return false;
}
}
基于答案的兼容Kotlin版本和示例:
package com.kenargo.composite\u小部件
导入android.os.Handler
导入android.view.MotionEvent
导入android.view.view
导入android.view.view.OnTouchListener
/**
*一个类,可在任何视图(例如按钮)上用作TouchListener。
*它循环运行clickListener,模拟类似键盘的行为。弗斯特
*单击会立即触发,下一个在initialInterval之后触发,随后
*延迟后的一个。
*
*@param initialInterval首次单击事件后的间隔
*@param initialRepeat延迟第二次和后续单击事件后的间隔
*
*@param clickListener将调用的OnClickListener
*周期性
*
*间隔安排在onClick完成之后,因此它必须快速运行。
*如果运行缓慢,则不会生成跳过的onclick。可以重写为
*实现这一目标。
*
*用法:
*
*setOnTouchListener(新的RepeatListener(400100,新的OnClickListener)(){
*@覆盖
*公共void onClick(视图){
*//重复执行的代码
* }
* }));
*
*科特林示例:
*setOnTouchListener(RepeatListener(defaultInitialTouchTime、defaultRepeatDelayTime、OnClickListener{
*//重复执行的代码
* }))
*
*/
类RepeatListener(
初始间隔:Int,
initialRepeatDelay:Int,
clickListener:View.OnClickListener
):OnTouchListener{
private val handler=handler()
私有变量初始间隔:Int
私有变量initialRepeatDelay:Int
私有变量clickListener:View.OnClickListener
私有变量touchedView:视图?=null
初始化{
要求(!(initialInterval<0 | | initialRepeatDelay<0)){“不允许负间隔”}
this.initialInterval=initialRepeatDelay
this.initialRepeatDelay=初始间隔
this.clickListener=clickListener
}
private val handlerRunnable:Runnable=run{
可运行{
如果(touchedView!!.isEnabled){
handler.postDelayed(handlerRunnable,initialRepeatDelay.toLong())
clickListener.onClick(touchedView)
}否则{
//如果clickListener禁用了视图,请删除回调
handler.removeCallbacks(handlerRunnable)
touchedView!!.isPressed=false
touchedView=null
}
}
}
重写fun onTouch(视图:视图,运动事件:运动事件):布尔值{
何时(motionEvent.action){
MotionEvent.ACTION\u向下->{
handler.removeCallbacks(handlerRunnable)
handler.postDelayed(handlerRunnable,initialRepeatDelay.toLong())
touchedView=视图
touchedView!!.isPressed=true
单击Listener.onClick(视图)
返回真值
}
MotionEvent.ACTION\u向上,MotionEvent.ACTION\u取消->{
handler.removeCallbacks(handlerRunnable)
touchedView!!.isPressed=false
touchedView=null
返回真值
}
}
返回错误
}
}
但这是我的应用程序的需要。我想在用户按住按钮的同时不断移动光标。每次触摸都可以正常工作。我只想在用户按住按钮时重复操作。@JoxTraex:请在回答中详细说明您的观点,并查看它得到多少赞成票。如果我想在用户按住按钮5秒钟时做些额外的事,如何识别用户按住按钮5秒钟。您只需将另一个延迟的Runnable
按到处理程序上即可。如果它应该是一个
Button button = new Button(context);
button.setOnTouchListener(new RepeatListener(400, 100, new OnClickListener() {
@Override
public void onClick(View view) {
// the code to execute repeatedly
}
}));
package com.kenargo.compound_widgets
import android.os.Handler
import android.view.MotionEvent
import android.view.View
import android.view.View.OnTouchListener
/**
* A class, that can be used as a TouchListener on any view (e.g. a Button).
* It cyclically runs a clickListener, emulating keyboard-like behaviour. First
* click is fired immediately, next one after the initialInterval, and subsequent
* ones after the initialRepeatDelay.
*
* @param initialInterval The interval after first click event
* @param initialRepeatDelay The interval after second and subsequent click events
*
* @param clickListener The OnClickListener, that will be called
* periodically
*
* Interval is scheduled after the onClick completes, so it has to run fast.
* If it runs slow, it does not generate skipped onClicks. Can be rewritten to
* achieve this.
*
* Usage:
*
* someView.setOnTouchListener(new RepeatListener(400, 100, new OnClickListener() {
* @Override
* public void onClick(View view) {
* // the code to execute repeatedly
* }
* }));
*
* Kotlin example:
* someView.setOnTouchListener(RepeatListener(defaultInitialTouchTime, defaultRepeatDelayTime, OnClickListener {
* // the code to execute repeatedly
* }))
*
*/
class RepeatListener(
initialInterval: Int,
initialRepeatDelay: Int,
clickListener: View.OnClickListener
) : OnTouchListener {
private val handler = Handler()
private var initialInterval: Int
private var initialRepeatDelay: Int
private var clickListener: View.OnClickListener
private var touchedView: View? = null
init {
require(!(initialInterval < 0 || initialRepeatDelay < 0)) { "negative intervals not allowed" }
this.initialInterval = initialRepeatDelay
this.initialRepeatDelay = initialInterval
this.clickListener = clickListener
}
private val handlerRunnable: Runnable = run {
Runnable {
if (touchedView!!.isEnabled) {
handler.postDelayed(handlerRunnable, initialRepeatDelay.toLong())
clickListener.onClick(touchedView)
} else {
// if the view was disabled by the clickListener, remove the callback
handler.removeCallbacks(handlerRunnable)
touchedView!!.isPressed = false
touchedView = null
}
}
}
override fun onTouch(view: View, motionEvent: MotionEvent): Boolean {
when (motionEvent.action) {
MotionEvent.ACTION_DOWN -> {
handler.removeCallbacks(handlerRunnable)
handler.postDelayed(handlerRunnable, initialRepeatDelay.toLong())
touchedView = view
touchedView!!.isPressed = true
clickListener.onClick(view)
return true
}
MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
handler.removeCallbacks(handlerRunnable)
touchedView!!.isPressed = false
touchedView = null
return true
}
}
return false
}
}