如何在按下的按鈕上顯示資訊

我正在嘗試在 kotlin 中為 android 制作一個擦除應用程式。它只有一個按鈕可以完成所有程序。但是當用戶單擊按鈕時，螢屏凍結，我的 setText 或 setProgress 函式不起作用。我認為這是因為它認為它必須完成該程序并進行 UI 更改。如何在程序中間設定文本或設定進度？

我的代碼：

// findViewById
    wipe_button = findViewById(R.id.wipe_button)
    progress_bar = findViewById(R.id.progressBar)
    main_textview = findViewById(R.id.main_textview)

    // Getting available memory
    freeMemory = getAvailableInternalMemorySizeInMB()

    // progressBar Settings
    progress_bar.max = 100
    progress_bar.setProgress(0)

    // OnClickListener
    wipe_button.setOnClickListener {
        checkPermissions()
        if (isPermissionGranted) {
            main_textview.setText("Started Wiping...")
            progress_bar.setProgress(0)
            fillStorage()
            progress_bar.setProgress(10)
            main_textview.setText("Created Filling Text. Copying...")
            copyFiles()
            progress_bar.setProgress(100)
            main_textview.setText("Finished Deleting.")
            Handler().postDelayed(Runnable {
                main_textview.setText("Click The Button To Start Wiping")
                progress_bar.setProgress(0)
            }, 5000)
        } else {
            if (requestNumber >= 2) {
                Toast.makeText(this, "Please Give Storage Permission To The App In Settings", Toast.LENGTH_SHORT).show()
            } else {
                requestPermissions()
            }
        }
    }

和按鈕功能：

private fun fillStorage() {
    val file = File(getExternalFilesDir(null), "fill-1.txt")
    val fileWriter = FileWriter(file, true)
    var fileSizeInMB = file.length() / 1048576
    var fileSizeInKB = (file.length()).toInt() / 1024
    while (fileSizeInMB < 4) {
        fileWriter.append("00000000")
        fileWriter.flush()
        fileSizeInMB = (file.length() / 1048576)
        fileSizeInKB = ((file.length().toInt()) / 1024)
        when (fileSizeInKB) {
            409 -> progress_bar.setProgress(1)
            818 -> progress_bar.setProgress(2)
            1227 -> progress_bar.setProgress(3)
            1636 -> progress_bar.setProgress(4)
            2045 -> progress_bar.setProgress(5)
            2454 -> progress_bar.setProgress(6)
            2863 -> progress_bar.setProgress(7)
            3272 -> progress_bar.setProgress(8)
            3681 -> progress_bar.setProgress(9)
            4096 -> progress_bar.setProgress(10)
        }
    }
}

private fun copyFiles() {
    val dir = File("/storage/emulated/0/Android/data/com.cemalmertozkan.wiped/files")
    var dirSize = File(Environment.getExternalStorageDirectory().absolutePath).length() / 1048576
    freeMemory = getAvailableInternalMemorySizeInMB()
    var fillingSizeInMB = freeMemory - 100
    val file = File(getExternalFilesDir(null), "fill-1.txt")
    var onePercentProgressInMb = fillingSizeInMB / 80
    var fileNumber = 1
    while (freeMemory > 100) {
        fileNumber = fileNumber   1
        var fileNew = File(getExternalFilesDir(null), "fill-"   fileNumber   ".txt")
        file.copyTo(fileNew, true)
        freeMemory = getAvailableInternalMemorySizeInMB()
        var completeNum : Int = (dirSize % onePercentProgressInMb).toInt()
        var copiedFilesInGB = dirSize % 1024
        main_textview.setText("Copied "   copiedFilesInGB   "GB Of Files.")
        progress_bar.setProgress(completeNum   10)
    }
    progress_bar.setProgress(90)
    main_textview.setText("Completed Copying. Deleting...")
    dir.deleteRecursively()
}

uj5u.com熱心網友回復：

您需要在協程中運行fillStorage()andcopyFiles()函式，該協程將在非 UI 執行緒中運行這些任務，因此您的螢屏不會凍結。

請通過這個 - Android協程指南

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