在安卓系统中防止双击按钮的最佳方法是什么?
当前回答
结合Gustavo的答案,我已经在Kotlin中实现了看起来非常干净的扩展:
fun View.setOnSingleClickListener(l: () -> Unit) {
setOnClickListener { view ->
l.invoke(view)
isEnabled = false
postDelayed({
isEnabled = true
}, 600)
}
}
这是你如何设置这个点击监听器:
yourView.setOnSingleClickListener {
// Insert your code here
}
其他回答
如果你在onClick()中进行计算密集型工作,则禁用按钮或设置不可点击是不够的,因为单击事件可以在禁用按钮之前排队。我写了一个实现OnClickListener的抽象基类,你可以重写,通过忽略任何排队点击来修复这个问题:
/**
* This class allows a single click and prevents multiple clicks on
* the same button in rapid succession. Setting unclickable is not enough
* because click events may still be queued up.
*
* Override onOneClick() to handle single clicks. Call reset() when you want to
* accept another click.
*/
public abstract class OnOneOffClickListener implements OnClickListener {
private boolean clickable = true;
/**
* Override onOneClick() instead.
*/
@Override
public final void onClick(View v) {
if (clickable) {
clickable = false;
onOneClick(v);
//reset(); // uncomment this line to reset automatically
}
}
/**
* Override this function to handle clicks.
* reset() must be called after each click for this function to be called
* again.
* @param v
*/
public abstract void onOneClick(View v);
/**
* Allows another click.
*/
public void reset() {
clickable = true;
}
}
用法与OnClickListener相同,但重写OnOneClick()代替:
OnOneOffClickListener clickListener = new OnOneOffClickListener() {
@Override
public void onOneClick(View v) {
// Do stuff
this.reset(); // or you can reset somewhere else with clickListener.reset();
}
};
myButton.setOnClickListener(clickListener);
I found none of these suggestions works if the onClick method doesn't return immediately. The touch event is queued by Android and the next onClick is called only after the first one is finished. (Since this is done on the one UI thread this is really normal.) I needed to use the time when the the onClick function is finished + one boolean variable to mark whether the given onClick is running. Both these marker attributes are static to avoid any onClickListener to run at the same time. (If user clicks on another button) You can simple replace your OnClickListener to this class and instead of implementing the onClick method you need to implement the abstract oneClick() method.
abstract public class OneClickListener implements OnClickListener {
private static boolean started = false;
private static long lastClickEndTime = 0;
/* (non-Javadoc)
* @see android.view.View.OnClickListener#onClick(android.view.View)
*/
@Override
final public void onClick(final View v) {
if(started || SystemClock.elapsedRealtime()-lastClickEndTime <1000 ){
Log.d(OneClickListener.class.toString(), "Rejected double click, " + new Date().toString() );
return;
}
Log.d(OneClickListener.class.toString(), "One click, start: " + new Date().toString() );
try{
started = true;
oneClick(v);
}finally{
started = false;
lastClickEndTime = SystemClock.elapsedRealtime();
Log.d(OneClickListener.class.toString(), "One click, end: " + new Date().toString() );
}
}
abstract protected void oneClick(View v);
}
使用setEnabled(false)禁用按钮,直到用户可以安全地再次单击它。
我更喜欢使用信号量块。它是线程安全的,不仅可以用于按钮。
代码示例很简单:
private UtilsSemaphore buttonSemaphore = new UtilsSemaphore();
public void onClick(View view)
{
boolean isAllowed = buttonSemaphore.lock();
if(!isAllowed)
{
return;
}
final View clickedButton = view;
clickedButton.setEnabled(false);
/* some code */
buttonSemaphore.unlock();
clickedButton.setEnabled(true);
}
public class UtilsSemaphore {
public int counter = 0;
public boolean lock()
{
int counterValue = ++counter;
boolean isAllowed = counterValue < 2;
if(!isAllowed)
{
unlock();
}
return isAllowed;
}
public void unlock()
{
--counter;
}
}
加上Jim的回答,代码可以变得更简洁:
fun View.setOnSingleClick(onClick: () -> Unit) {
var lastClickTime = 0L
setOnClickListener {
if (currentTimeMillis() > lastClickTime + 750) onClick()
lastClickTime = currentTimeMillis()
}
}
用法:
aView.setOnSingleClick { }
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