Question

在MainActivity我有一个Runnable，我想将变量传递给。我在第二个示例中尝试在TextView中添加timerValue Runnable()，但这不是正确的方法。

private Runnable updateTimerThread = new Runnable() {

    public void run() {

        timeInMilliseconds = SystemClock.uptimeMillis() - startTime;

        updatedTime = timeSwapBuff + timeInMilliseconds;

        int secs = (int) (timeInMilliseconds / 1000);
        int mins = secs / 60;
        secs = secs % 60;
        int hours = mins / 60;
        mins = mins % 60;
        recordtimer = "Recording Time: " + String.format("%02d", hours) + ":" + String.format("%02d", mins) + ":" + String.format("%02d", secs);
        timerValueRecord.post(new Runnable()
        {
            public void run()
            {
                timerValueRecord.setText(recordtimer);
            }
        });
                //set yout textview to the String timer here
        customHandler.postDelayed(this, 1000);
    }

};

我需要它来获取TextView，而不是使用它所使用的timerValueRecord，例如TextView timerValue。

逻辑是这样的：

private Runnable updateTimerThread = new Runnable(TextView timerValue){

    public void run() {

        timeInMilliseconds = SystemClock.uptimeMillis() - startTime;

        updatedTime = timeSwapBuff + timeInMilliseconds;

        int secs = (int) (timeInMilliseconds / 1000);
        int mins = secs / 60;
        secs = secs % 60;
        int hours = mins / 60;
        mins = mins % 60;
        recordtimer = "Recording Time: " + String.format("%02d", hours) + ":" + String.format("%02d", mins) + ":" + String.format("%02d", secs);
        timerValue.post(new Runnable()
        {
            public void run()
            {
                timerValue.setText(recordtimer);
            }
        });
                //set yout textview to the String timer here
        customHandler.postDelayed(this, 1000);
    }

};

Answer 1

创建一个实现Runnable的类，让类的构造函数接受输入，或者提供setter来设置值。一种方法是：

public class UpdateTimerThread implements Runnable {
    protected TextView timerValue;

    public UpdateTimerThread(TextView timerValue) {
        this.timerValue= timerValue;
    }

    public void run() {
       ....
       // you can access timerValue here
    }
}

private Runnable updateTimerThread = new UpdateTimerThread(timerValue);

Answer 2

创建另一个类（如建议的）效果很好。或者，您可以使用匿名内部类。这样的类可以访问包含它的任何Auth::user()变量。如，

<ul>
    @if (Auth::guest())
        <li><a href="/guest/login">Login to the site</a></li>
        <li><a href="/guest/register">Register</a></li>
    @else
        @if ($user->type == 'admin')
            <li><a href="/admin/dashboard">Home Page</a></li>
            <li><a href="/admin/users">Users</a></li>
            ...
       @elseif ($user->type == 'instructor')
            <li><a href="/instructor/dashboard">Home Page</a></li>
            <li><a href="/instructor/students">Students</a></li>
            ...
       @elseif ($user->type == 'student')
            <li><a href="/student/dashboard">Home Page</a></li>
            <li><a href="/student/lessons">Lessons</a></li>
            ...
       @endif
    @endif
</ul>

如何将变量传递给Runnable？

2 个答案: