在安卓系统中防止双击按钮的最佳方法是什么?
当前回答
下面的代码将防止用户点击多次在几分之一秒内,只允许3秒后。
private long lastClickTime = 0;
View.OnClickListener buttonHandler = new View.OnClickListener() {
public void onClick(View v) {
// preventing double, using threshold of 3000 ms
if (SystemClock.elapsedRealtime() - lastClickTime < 3000){
return;
}
lastClickTime = SystemClock.elapsedRealtime();
}
}
其他回答
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;
}
}
我希望这能帮助你,把代码放在你的事件处理程序。
// --------------------------------------------------------------------------------
boolean hasTag = null != which.getTag( R.id.preventing_double_click_tag );
if ( hasTag ) {
// Do not handle again...
return;
} else {
which.setTag( R.id.action, Boolean.TRUE );
which.postDelayed( new Runnable() {
@Override
public void run() {
which.setTag( R.id.action, null );
Log.d( "onActin", " The preventing double click tag was removed." );
}
}, 2000 );
}
这是我的解决方案:
if (waitDouble) {
waitDouble = false;
Thread thread = new Thread() {
@Override
public void run() {
try {
sleep(300);
if (waitDouble == false) {
waitDouble = true;
singleClick(); //singleClick
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
thread.start();
} else {//DoubleClick
DoubleClick();
waitDouble = true;
}
或者另一种解决方案:
public class NoDoubleClickUtils {
private static long lastClickTime;
private final static int SPACE_TIME = 500;
public static void initLastClickTime() {
lastClickTime = 0;
}
public synchronized static boolean isDoubleClick() {
long currentTime = System.currentTimeMillis();
boolean isClick2;
if (currentTime - lastClickTime > SPACE_TIME) {
isClick2 = false;
} else {
isClick2 = true;
}
lastClickTime = currentTime;
return isClick2;
}
}
Setting the button as clickable false upon clicking and true once it is desired to make the button clickable again is the right approach. For instance, consider the following scenario: you are making a service call upon click of a button and once the service is done you want to display a dialog. For this, once the button is clicked you can set setClickable(false) and once the service responds you will do setClicklable(true) through a reference you pass to your custom dialog. When dialog invokes isShowing() you can trigger the listener and setClicklable(true).
KLEANEST Kotlin惯用方式:
class OnSingleClickListener(private val block: () -> Unit) : View.OnClickListener {
private var lastClickTime = 0L
override fun onClick(view: View) {
if (SystemClock.elapsedRealtime() - lastClickTime < 1000) {
return
}
lastClickTime = SystemClock.elapsedRealtime()
block()
}
}
fun View.setOnSingleClickListener(block: () -> Unit) {
setOnClickListener(OnSingleClickListener(block))
}
用法:
button.setOnSingleClickListener { ... }
或者加上一个控制油门的附加参数
class OnClickListenerThrottled(private val block: () -> Unit, private val wait: Long) : View.OnClickListener {
private var lastClickTime = 0L
override fun onClick(view: View) {
if (SystemClock.elapsedRealtime() - lastClickTime < wait) {
return
}
lastClickTime = SystemClock.elapsedRealtime()
block()
}
}
/**
* A throttled click listener that only invokes [block] at most once per every [wait] milliseconds.
*/
fun View.setOnClickListenerThrottled(wait: Long = 1000L, block: () -> Unit) {
setOnClickListener(OnClickListenerThrottled(block, wait))
}
Usages:
button.setOnClickListenerThrottled(2000L) { /** some action */}
or
button.setOnClickListenerThrottled { /** some action */}
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