Question

我想要在 onProgressChanged 方法之外使用 seekbar 值但它总是给我一个零值。我想取两个搜索栏的值并将它们相乘

class BmiActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
    var weight =0f
    var height = 0f
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_bmi)
    val seekbarHeight=findViewById<SeekBar>(R.id.seekBarHeight)

    var tvResultHeight=findViewById<TextView>(R.id.textViewResultHeight)
    val tvResultWeight=findViewById<TextView>(R.id.textViewResultWeight)
    val seekbarWeight =findViewById<SeekBar>(R.id.seekBarWeight)
    val spinnerAge=findViewById<Spinner>(R.id.spinnerAge)
    val imageviewNeedle=findViewById<ImageView>(R.id.imageViewNeedle)
    val tvResultBmi=findViewById<TextView>(R.id.textViewResultBmi)
    seekbarHeight.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
        override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
            tvResultHeight.text=" "+progress.toString()
            height= progress.toFloat()
        }
        override fun onStartTrackingTouch(p0: SeekBar?) {
        }
        override fun onStopTrackingTouch(p0: SeekBar?) {
        }
    })
    seekbarWeight.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
        override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
            tvResultWeight.text=" "+progress.toString()
            weight=progress.toFloat()
        }

        override fun onStartTrackingTouch(p0: SeekBar?) {
        }
        override fun onStopTrackingTouch(p0: SeekBar?) {
        }
    })
    var result = weight/(height*height)
    tvResultBmi.text=result.toString()

Answer 1

你可以做回调/接口。然后当两者都触发时，值发生了变化。

首先，您需要创建界面。创建一个名为 ResultInterface.kt 的新文件

interface ResultInterface {
    fun onValueChanged(height: Float, weight: Float)
}

然后将它们中的每一个放入一个函数中。

fun seekBarHeight(resultInterface: ResultInterface) {
        seekbarHeight.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
            override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
                tvResultHeight.text = " " + progress.toString()
                val height = progress.toFloat()
                resultInterface.onValueChanged(height, 0f)
            }

        override fun onStartTrackingTouch(p0: SeekBar?) {
        }

        override fun onStopTrackingTouch(p0: SeekBar?) {
        }
    })
}


fun seekBarWeight(resultInterface: ResultInterface) {
        seekbarWeight.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
            override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
                tvResultWeight.text = " " + progress.toString()
                val weight = progress.toFloat()
                resultInterface.onValueChanged(0f, weight)
            }

        override fun onStartTrackingTouch(p0: SeekBar?) {
        }

        override fun onStopTrackingTouch(p0: SeekBar?) {
        }
    })
}

最后，在您的活动中，实施 ResutInterface

class BmiActivity : AppCompatActivity(), ResultInterface {

之后你需要 alt + enter 。并且 onValueChanged 方法将覆盖。

  override fun onValueChanged(height: Float, weight: Float) {
        val result = weight/(height*height)
        tvResultBmi.text=result.toString()
    }

我无法从搜索栏获得输出

1 个答案: