避免多次点击按钮

Question 1

我的应用存在一个问题，如果用户快速多次单击按钮，则会生成多个事件，甚至在我按住该按钮的对话框消失之前

我知道一种解决方案，可以在单击按钮时将布尔变量设置为标志，以便在对话框关闭之前可以防止将来的单击。但是，我有很多按钮，每次都要为每个按钮执行此操作似乎是过大的选择。android（还有一些更聪明的解决方案）中是否没有其他方法只能允许每次按钮单击生成事件事件？

更糟糕的是，多次快速单击似乎甚至在处理第一个操作之前就生成了多个事件操作，因此，如果我想在第一次单击处理方法中禁用该按钮，则队列中已有等待处理的事件操作！

请帮忙谢谢

Question 2

这是我最近编写的“已反跳”的onClick侦听器。您告诉它两次点击之间的最小可接受毫秒数是多少。实施逻辑onDebouncedClick而不是onClick

import android.os.SystemClock;
import android.view.View;

import java.util.Map;
import java.util.WeakHashMap;

/**
 * A Debounced OnClickListener
 * Rejects clicks that are too close together in time.
 * This class is safe to use as an OnClickListener for multiple views, and will debounce each one separately.
 */
public abstract class DebouncedOnClickListener implements View.OnClickListener {

    private final long minimumIntervalMillis;
    private Map<View, Long> lastClickMap;

    /**
     * Implement this in your subclass instead of onClick
     * @param v The view that was clicked
     */
    public abstract void onDebouncedClick(View v);

    /**
     * The one and only constructor
     * @param minimumIntervalMillis The minimum allowed time between clicks - any click sooner than this after a previous click will be rejected
     */
    public DebouncedOnClickListener(long minimumIntervalMillis) {
        this.minimumIntervalMillis = minimumIntervalMillis;
        this.lastClickMap = new WeakHashMap<>();
    }

    @Override 
    public void onClick(View clickedView) {
        Long previousClickTimestamp = lastClickMap.get(clickedView);
        long currentTimestamp = SystemClock.uptimeMillis();

        lastClickMap.put(clickedView, currentTimestamp);
        if(previousClickTimestamp == null || Math.abs(currentTimestamp - previousClickTimestamp) > minimumIntervalMillis) {
            onDebouncedClick(clickedView);
        }
    }
}

Question 3

使用RxBinding可以轻松完成。这是一个例子：

RxView.clicks(view).throttleFirst(500, TimeUnit.MILLISECONDS).subscribe(empty -> {
            // action on click
        });

在下面添加以下行build.gradle以添加RxBinding依赖项：

compile 'com.jakewharton.rxbinding:rxbinding:0.3.0'

Question 4

这是我接受的答案的版本。它非常相似，但是不会尝试将Views存储在Map中，我认为这不是一个好主意。它还添加了一个包装方法，在许多情况下都可能有用。

/**
 * Implementation of {@link OnClickListener} that ignores subsequent clicks that happen too quickly after the first one.<br/>
 * To use this class, implement {@link #onSingleClick(View)} instead of {@link OnClickListener#onClick(View)}.
 */
public abstract class OnSingleClickListener implements OnClickListener {
    private static final String TAG = OnSingleClickListener.class.getSimpleName();

    private static final long MIN_DELAY_MS = 500;

    private long mLastClickTime;

    @Override
    public final void onClick(View v) {
        long lastClickTime = mLastClickTime;
        long now = System.currentTimeMillis();
        mLastClickTime = now;
        if (now - lastClickTime < MIN_DELAY_MS) {
            // Too fast: ignore
            if (Config.LOGD) Log.d(TAG, "onClick Clicked too quickly: ignored");
        } else {
            // Register the click
            onSingleClick(v);
        }
    }

    /**
     * Called when a view has been clicked.
     * 
     * @param v The view that was clicked.
     */
    public abstract void onSingleClick(View v);

    /**
     * Wraps an {@link OnClickListener} into an {@link OnSingleClickListener}.<br/>
     * The argument's {@link OnClickListener#onClick(View)} method will be called when a single click is registered.
     * 
     * @param onClickListener The listener to wrap.
     * @return the wrapped listener.
     */
    public static OnClickListener wrap(final OnClickListener onClickListener) {
        return new OnSingleClickListener() {
            @Override
            public void onSingleClick(View v) {
                onClickListener.onClick(v);
            }
        };
    }
}

Question 5

我们可以在没有任何库的情况下做到这一点。只需创建一个扩展功能：

fun View.clickWithDebounce(debounceTime: Long = 600L, action: () -> Unit) {
    this.setOnClickListener(object : View.OnClickListener {
        private var lastClickTime: Long = 0

        override fun onClick(v: View) {
            if (SystemClock.elapsedRealtime() - lastClickTime < debounceTime) return
            else action()

            lastClickTime = SystemClock.elapsedRealtime()
        }
    })
}

使用以下代码查看onClick：

buttonShare.clickWithDebounce { 
   // Do anything you want
}

Question 6

您可以使用以下项目：https : //github.com/fengdai/clickguard 只需一条语句即可解决此问题：

ClickGuard.guard(button);

更新：不建议再使用此库。我更喜欢Nikita的解决方案。请改用RxBinding。

Question 7

这是一个简单的例子：

public abstract class SingleClickListener implements View.OnClickListener {
    private static final long THRESHOLD_MILLIS = 1000L;
    private long lastClickMillis;

    @Override public void onClick(View v) {
        long now = SystemClock.elapsedRealtime();
        if (now - lastClickMillis > THRESHOLD_MILLIS) {
            onClicked(v);
        }
        lastClickMillis = now;
    }

    public abstract void onClicked(View v);
}

Question 8

只是GreyBeardedGeek解决方案的快速更新。更改if子句并添加Math.abs函数。像这样设置：

  if(previousClickTimestamp == null || (Math.abs(currentTimestamp - previousClickTimestamp.longValue()) > minimumInterval)) {
        onDebouncedClick(clickedView);
    }

用户可以在Android设备上更改时间并将其保存在过去，因此如果没有此时间，则可能会导致错误。

PS：没有足够的观点来评论您的解决方案，所以我只想提出另一个答案。

Question 9

这适用于任何事件，而不仅仅是单击。即使它是一系列快速事件（例如rx debounce）的一部分，它也将提供最后一个事件。

class Debouncer(timeout: Long, unit: TimeUnit, fn: () -> Unit) {

    private val timeoutMillis = unit.toMillis(timeout)

    private var lastSpamMillis = 0L

    private val handler = Handler()

    private val runnable = Runnable {
        fn()
    }

    fun spam() {
        if (SystemClock.uptimeMillis() - lastSpamMillis < timeoutMillis) {
            handler.removeCallbacks(runnable)
        }
        handler.postDelayed(runnable, timeoutMillis)
        lastSpamMillis = SystemClock.uptimeMillis()
    }
}


// example
view.addOnClickListener.setOnClickListener(object: View.OnClickListener {
    val debouncer = Debouncer(1, TimeUnit.SECONDS, {
        showSomething()
    })

    override fun onClick(v: View?) {
        debouncer.spam()
    }
})

1）在侦听器的字段中但在回调函数外部构造Debouncer，配置了超时和要限制的回调fn。

2）在监听器的回调函数中调用Debouncer的垃圾邮件方法。

Question 10

使用RxJava的类似解决方案

import android.view.View;

import java.util.concurrent.TimeUnit;

import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action1;
import rx.subjects.PublishSubject;

public abstract class SingleClickListener implements View.OnClickListener {
    private static final long THRESHOLD_MILLIS = 600L;
    private final PublishSubject<View> viewPublishSubject = PublishSubject.<View>create();

    public SingleClickListener() {
        viewPublishSubject.throttleFirst(THRESHOLD_MILLIS, TimeUnit.MILLISECONDS)
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Action1<View>() {
                    @Override
                    public void call(View view) {
                        onClicked(view);
                    }
                });
    }

    @Override
    public void onClick(View v) {
        viewPublishSubject.onNext(v);
    }

    public abstract void onClicked(View v);
}

Question 11

因此，该答案由ButterKnife库提供。

package butterknife.internal;

import android.view.View;

/**
 * A {@linkplain View.OnClickListener click listener} that debounces multiple clicks posted in the
 * same frame. A click on one button disables all buttons for that frame.
 */
public abstract class DebouncingOnClickListener implements View.OnClickListener {
  static boolean enabled = true;

  private static final Runnable ENABLE_AGAIN = () -> enabled = true;

  @Override public final void onClick(View v) {
    if (enabled) {
      enabled = false;
      v.post(ENABLE_AGAIN);
      doClick(v);
    }
  }

  public abstract void doClick(View v);
}

此方法仅在处理完先前的单击后处理单击，并注意避免在框架中多次单击。

Question 12

一个Handler基于节流信号应用。

import android.os.Handler;
import android.support.annotation.NonNull;

/**
 * A class that will throttle the number of runnables executed to be at most once every specified
 * interval.
 *
 * Useful for performing actions in response to rapid user input where you want to take action on
 * the initial input but prevent follow-up spam.
 *
 * This is different from a Debouncer in that it will run the first runnable immediately
 * instead of waiting for input to die down.
 *
 * See http://rxmarbles.com/#throttle
 */
public final class Throttler {

    private static final int WHAT = 8675309;

    private final Handler handler;
    private final long    thresholdMs;

    /**
     * @param thresholdMs Only one runnable will be executed via {@link #publish} every
     *                  {@code thresholdMs} milliseconds.
     */
    public Throttler(long thresholdMs) {
        this.handler     = new Handler();
        this.thresholdMs = thresholdMs;
    }

    public void publish(@NonNull Runnable runnable) {
        if (handler.hasMessages(WHAT)) {
            return;
        }

        runnable.run();
        handler.sendMessageDelayed(handler.obtainMessage(WHAT), thresholdMs);
    }

    public void clear() {
        handler.removeCallbacksAndMessages(null);
    }
}

用法示例：

throttler.publish(() -> Log.d("TAG", "Example"));

在中的示例用法OnClickListener：

view.setOnClickListener(v -> throttler.publish(() -> Log.d("TAG", "Example")));

Kt用法示例：

view.setOnClickListener {
    throttler.publish {
        Log.d("TAG", "Example")
    }
}

或带有扩展名：

fun View.setThrottledOnClickListener(throttler: Throttler, function: () -> Unit) {
    throttler.publish(function)
}

然后是示例用法：

view.setThrottledOnClickListener(throttler) {
    Log.d("TAG", "Example")
}

Question 13

我将此类与数据绑定一起使用。效果很好。

/**
 * This class will prevent multiple clicks being dispatched.
 */
class OneClickListener(private val onClickListener: View.OnClickListener) : View.OnClickListener {
    private var lastTime: Long = 0

    override fun onClick(v: View?) {
        val current = System.currentTimeMillis()
        if ((current - lastTime) > 500) {
            onClickListener.onClick(v)
            lastTime = current
        }
    }

    companion object {
        @JvmStatic @BindingAdapter("oneClick")
        fun setOnClickListener(theze: View, f: View.OnClickListener?) {
            when (f) {
                null -> theze.setOnClickListener(null)
                else -> theze.setOnClickListener(OneClickListener(f))
            }
        }
    }
}

我的布局看起来像这样

<TextView
        app:layout_constraintTop_toBottomOf="@id/bla"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:gravity="center"
        android:textSize="18sp"
        app:oneClick="@{viewModel::myHandler}" />

Question 14

处理这种情况的更重要的方法是将RxJava2与Throttling运算符（Throttle First）一起使用。在Kotlin中实现此步骤：

1）。依赖关系：-在build.gradle应用级文件中添加rxjava2依赖关系。

implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
implementation 'io.reactivex.rxjava2:rxjava:2.2.10'

2）。构造一个实现View.OnClickListener的抽象类，该类包含节流优先运算符以处理视图的OnClick（）方法。代码段为：

import android.util.Log
import android.view.View
import io.reactivex.android.schedulers.AndroidSchedulers
import io.reactivex.subjects.PublishSubject
import java.util.concurrent.TimeUnit

abstract class SingleClickListener : View.OnClickListener {
   private val publishSubject: PublishSubject<View> = PublishSubject.create()
   private val THRESHOLD_MILLIS: Long = 600L

   abstract fun onClicked(v: View)

   override fun onClick(p0: View?) {
       if (p0 != null) {
           Log.d("Tag", "Clicked occurred")
           publishSubject.onNext(p0)
       }
   }

   init {
       publishSubject.throttleFirst(THRESHOLD_MILLIS, TimeUnit.MILLISECONDS)
               .observeOn(AndroidSchedulers.mainThread())
               .subscribe { v -> onClicked(v) }
   }
}

3）。在活动视图点击时实现此SingleClickListener类。这可以通过以下方式实现：

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

   val singleClickListener = object : SingleClickListener(){
      override fun onClicked(v: View) {
       // operation on click of xm_view_id
      }
  }
xm_viewl_id.setOnClickListener(singleClickListener)
}

在应用程序中实施上述步骤可以简单地避免多次单击视图直到600mS。祝您编码愉快！

Question 15

您可以将Rxbinding3用于此目的。只需在build.gradle中添加此依赖项

build.gradle

implementation 'com.jakewharton.rxbinding3:rxbinding:3.1.0'

然后在您的活动或片段中，使用以下代码

your_button.clicks().throttleFirst(10000, TimeUnit.MILLISECONDS).subscribe {
    // your action
}

Question 16

这样解决

Observable<Object> tapEventEmitter = _rxBus.toObserverable().share();
Observable<Object> debouncedEventEmitter = tapEventEmitter.debounce(1, TimeUnit.SECONDS);
Observable<List<Object>> debouncedBufferEmitter = tapEventEmitter.buffer(debouncedEventEmitter);

debouncedBufferEmitter.buffer(debouncedEventEmitter)
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(new Action1<List<Object>>() {
      @Override
      public void call(List<Object> taps) {
        _showTapCount(taps.size());
      }
    });

Question 17

这是一个非常简单的解决方案，可以与lambdas一起使用：

view.setOnClickListener(new DebounceClickListener(v -> this::doSomething));

这是可复制/粘贴的代码段：

public class DebounceClickListener implements View.OnClickListener {

    private static final long DEBOUNCE_INTERVAL_DEFAULT = 500;
    private long debounceInterval;
    private long lastClickTime;
    private View.OnClickListener clickListener;

    public DebounceClickListener(final View.OnClickListener clickListener) {
        this(clickListener, DEBOUNCE_INTERVAL_DEFAULT);
    }

    public DebounceClickListener(final View.OnClickListener clickListener, final long debounceInterval) {
        this.clickListener = clickListener;
        this.debounceInterval = debounceInterval;
    }

    @Override
    public void onClick(final View v) {
        if ((SystemClock.elapsedRealtime() - lastClickTime) < debounceInterval) {
            return;
        }
        lastClickTime = SystemClock.elapsedRealtime();
        clickListener.onClick(v);
    }
}

请享用！

Question 18

根据@GreyBeardedGeek 答案，

创建debounceClick_last_Timestamp上ids.xml标记以前的点击时间戳。

将此代码块添加到 BaseActivity

protected void debounceClick(View clickedView, DebouncedClick callback){
    debounceClick(clickedView,1000,callback);
}

protected void debounceClick(View clickedView,long minimumInterval, DebouncedClick callback){
    Long previousClickTimestamp = (Long) clickedView.getTag(R.id.debounceClick_last_Timestamp);
    long currentTimestamp = SystemClock.uptimeMillis();
    clickedView.setTag(R.id.debounceClick_last_Timestamp, currentTimestamp);
    if(previousClickTimestamp == null 
          || Math.abs(currentTimestamp - previousClickTimestamp) > minimumInterval) {
        callback.onClick(clickedView);
    }
}

public interface DebouncedClick{
    void onClick(View view);
}

用法：

view.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        debounceClick(v, 3000, new DebouncedClick() {
            @Override
            public void onClick(View view) {
                doStuff(view); // Put your's click logic on doStuff function
            }
        });
    }
});

使用lambda

view.setOnClickListener(v -> debounceClick(v, 3000, this::doStuff));

Question 19

在这里举一个小例子

view.safeClick { doSomething() }

@SuppressLint("CheckResult")
fun View.safeClick(invoke: () -> Unit) {
    RxView
        .clicks(this)
        .throttleFirst(300, TimeUnit.MILLISECONDS)
        .subscribe { invoke() }
}

Question 20

我的解决方案，removeall当我们从片段和活动中退出（销毁）时需要调用：

import android.os.Handler
import android.os.Looper
import java.util.concurrent.TimeUnit

    //single click handler
    object ClickHandler {

        //used to post messages and runnable objects
        private val mHandler = Handler(Looper.getMainLooper())

        //default delay is 250 millis
        @Synchronized
        fun handle(runnable: Runnable, delay: Long = TimeUnit.MILLISECONDS.toMillis(250)) {
            removeAll()//remove all before placing event so that only one event will execute at a time
            mHandler.postDelayed(runnable, delay)
        }

        @Synchronized
        fun removeAll() {
            mHandler.removeCallbacksAndMessages(null)
        }
    }

Question 21

我会说最简单的方法是使用像KProgressHUD这样的“加载”库。

https://github.com/Kaopiz/KProgressHUD

onClick方法的第一件事是调用加载动画，该动画会立即阻止所有UI，直到开发人员决定释放它为止。

因此，您可以在onClick动作中使用它（它使用Butterknife，但显然适用于任何一种方法）：

另外，不要忘记单击后禁用该按钮。

@OnClick(R.id.button)
void didClickOnButton() {
    startHUDSpinner();
    button.setEnabled(false);
    doAction();
}

然后：

public void startHUDSpinner() {
    stopHUDSpinner();
    currentHUDSpinner = KProgressHUD.create(this)
            .setStyle(KProgressHUD.Style.SPIN_INDETERMINATE)
            .setLabel(getString(R.string.loading_message_text))
            .setCancellable(false)
            .setAnimationSpeed(3)
            .setDimAmount(0.5f)
            .show();
}

public void stopHUDSpinner() {
    if (currentHUDSpinner != null && currentHUDSpinner.isShowing()) {
        currentHUDSpinner.dismiss();
    }
    currentHUDSpinner = null;
}

如果需要，可以在doAction（）方法中使用stopHUDSpinner方法：

private void doAction(){ 
   // some action
   stopHUDSpinner()
}

根据您的应用逻辑重新启用按钮：button.setEnabled（true）;