Question

我有两个按钮PLUS和MINUS以及editText，称为T.如果用户点击PLUS，则editText值应该增加，如果用户按下MINUS，则值应该减小。现在，如果用户长时间 HOLDS 按钮，我想一次又一次地做同样的事情。如果任务加速会更好。例如

用户按住按钮1秒钟，T的变化率为1 /秒。如果他继续持续一段时间，那么T的变化率就是4.

我该怎么做？

Answer 1

您覆盖onTouchEvent，当您看到触碰时，您为 1s 设置了计时器，并将文字的值更改为 1 。当计时器熄灭时，您可以通过 1 更改文本的值并设置下一个计时器。

如果是时候加快速度，你可以让计时器更快。当您最终在ACTION_UP中看到onTouchEvent时，您取消了最后一个计时器。

Answer 2

我发布了一个完美的，有效的解决方案：

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;

public class AutoRepeatButton extends Button {
    private long initialRepeatDelay = 500;
    private long repeatIntervalInMilliseconds = 100;

    // speedup
    private long repeatIntervalCurrent = repeatIntervalInMilliseconds;
    private long repeatIntervalStep = 2;
    private long repeatIntervalMin = 10;

    private Runnable repeatClickWhileButtonHeldRunnable = new Runnable() {
        @Override
        public void run() {
            // Perform the present repetition of the click action provided by the user
            // in setOnClickListener().
            performClick();

            // Schedule the next repetitions of the click action, 
            // faster and faster until it reaches repeaterIntervalMin
            if (repeatIntervalCurrent > repeatIntervalMin)
                repeatIntervalCurrent = repeatIntervalCurrent - repeatIntervalStep;

            postDelayed(repeatClickWhileButtonHeldRunnable, repeatIntervalCurrent);
        }
    };

    private void commonConstructorCode() {
        this.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                int action = event.getAction();
                if (action == MotionEvent.ACTION_DOWN) {
                    // Just to be sure that we removed all callbacks,
                    // which should have occurred in the ACTION_UP
                    removeCallbacks(repeatClickWhileButtonHeldRunnable);

                    // Perform the default click action.
                    performClick();

                    // Schedule the start of repetitions after a one half second delay.
                    repeatIntervalCurrent = repeatIntervalInMilliseconds;
                    postDelayed(repeatClickWhileButtonHeldRunnable, initialRepeatDelay);
                } else if (action == MotionEvent.ACTION_UP) {
                    // Cancel any repetition in progress.
                    removeCallbacks(repeatClickWhileButtonHeldRunnable);
                }

                // Returning true here prevents performClick() from getting called
                // in the usual manner, which would be redundant, given that we are
                // already calling it above.
                return true;
            }
        });
    }

    public AutoRepeatButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        commonConstructorCode();
    }

     public AutoRepeatButton(Context context, AttributeSet attrs) {
     super(context, attrs);
     commonConstructorCode();
     }

    public AutoRepeatButton(Context context) {
        super(context);
        commonConstructorCode();
    }
}

Android Hold按钮发送多次点击

2 个答案: