Android 使用线程在 TaskView 中加载文本

Question

我有一个 Android 应用程序，有一个 Fragment Activity 和一个 ID 为“debugLog”的 TextView。 我想每 500 毫秒用新数据更新一次 Textview。

我的问题是，Timer() 只工作一次，然后永远不会执行？

class DiagnoseUart : Fragment() {
    // TODO: Rename and change types of parameterss
    val logWriter = LogWriter();

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment

        val view =  inflater.inflate(R.layout.fragment_diagnose_uart, container, false);
        val handler = Handler()
        val debugLog = view.findViewById<TextView>(R.id.debugLog);

        debugLog.movementMethod = ScrollingMovementMethod();

        Timer().schedule(timerTask {
            val log = logWriter.getLog();
            [email protected]()?.runOnUiThread(Runnable {
                debugLog.text = log;
            })
        }, 500);

        return view;
    }
}

Answer 1

希望对您有所帮助。 当然还有更多的解决方案。

    var count = 1
    Timer().schedule(time = Date(), period = 500, action = {
        binding.textHome.text = count.toString()
        count += 1
    })

或

    var count = 1
    val timerHandler = Handler()
    val timerRunnable: Runnable = object : Runnable {
        override fun run() {
            binding.textHome.text = String.format("%d", count)
            count+=1
            timerHandler.postDelayed(this, 500)
        }
    }
    timerRunnable.run()

或

     var count = 1

    val handler = Handler()
    handler.postDelayed(object : Runnable {
        override fun run() {
            //Call your function here
            binding.textHome.text = count.toString()
            count += 1
            handler.postDelayed(this, 500)//1 sec delay
        }
    }, 0)

Answer 2

谢谢你，

此代码适用于 API 23：

var count = 1
    Timer().schedule(time = Date(), period = 500, action = {
        binding.textHome.text = count.toString()
        count += 1
    })

还有这个：

val timerRunnable: Runnable = object : Runnable {
            override fun run() {
                val log = logWriter.getLog();
                [email protected]()?.runOnUiThread(Runnable {
                    debugLog.text = log;
                })
                handler.postDelayed(this, 500);
            }
        }

        timerRunnable.run();

当我的片段视图关闭时，计时器会自动销毁吗？