android 自定義步驟欄

今天自定義了一個操作步驟欄，雖然在平常的專案中用處不大，但是也值得記錄一下，先看下效果圖

圖中紅圈部分的內容就是效果圖

先看下使用方法，程式碼使用了kotlin語言，如果是要java程式碼的話，可以自行用去轉化，不難。

1.佈局中使用自定義控制元件

2.在activity或是Fragment中使用

可以看到，使用了建造者模式提供了很多方法供使用者自己設定屬性，使用者可以設定步驟總數，當前處於哪個步驟，是否顯示間隔線以及間隔線的寬度高度顏色等，備註裡寫的很清楚。

以下是完整自定義元件的完整程式碼

package com.example.testproject.widget

import android.content.Context
import android.util.AttributeSet
import android.util.TypedValue
import android.view.Gravity
import android.view.View
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.TextView
import com.example.testproject.R

class RegisterStepsBar : LinearLayout {
private var mCurrentBackground: Int = R.drawable.shape_circle_step //當前圓圈背景色
private var mPassedBackground: Int = R.drawable.shape_circle_white //通過的圓圈背景色
private var mNormalBackground: Int = R.drawable.shape_circle_gray //未通過的圓圈背景色
private var mSpaceBetween: Int = 25 //間隔
private var mNormalWidth: Int = 14 //未通過的寬度
private var mCurrentWidth: Int = 18 //當前的寬度
private var mCurrentStep: Int = 0 //預設當前步驟下標為0
private var mStepCount: Int = 3 //預設總共3個步驟
private var mLineWidth: Int = 20 //間隔線寬度預設是20
private var mLineHeight: Int = 1 //間隔線高度預設是1
private var isShow: Boolean = true //是否顯示分隔線
private var currentTextColor: Int = 0 //當前步驟的字型顏色
private var passTextColor: Int = 0 //通過的步驟的字型顏色
private var normalTextColor: Int = 0 //未通過的步驟的字型顏色
private var lineColor: Int = 0 //間隔線顏色
private var textSize: Float = 13f //步驟的字型顏色
private var contentText = emptyArray() //設定文字內容

private var lineView: View? = null
private var tvCurrentStep: TextView? = null

constructor(context: Context?) : super(context)

constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)

constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

/**
 *  dp轉換為px
 */
private fun dp2px(dp: Float): Int {
    return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, resources.displayMetrics).toInt()
}

/**
 * 初始化控制元件，先佈局後動態建立元件
 */
fun init() {
    if (mStepCount <= 0)
        return
    if (childCount > 0)
        removeAllViews()
    orientation = HORIZONTAL
    gravity = Gravity.CENTER_VERTICAL
    for (item: Int in 0 until mStepCount) {
        tvCurrentStep = TextView(context)
        if (item < mStepCount - 1 && isShow) {//建立間隔線
            lineView = View(context)
            lineView!!.setBackgroundResource(lineColor)
            val params1 = LayoutParams(dp2px(mLineWidth.toFloat()), dp2px(mLineHeight.toFloat()))
            params1.gravity = Gravity.CENTER
            params1.leftMargin = mSpaceBetween
            lineView!!.layoutParams = params1
        }
        var background: Int
        var width: Int = mNormalWidth
        when {
            item < mCurrentStep -> {
                background = mPassedBackground
                tvCurrentStep!!.setTextColor(context.resources.getColor(passTextColor))
            }
            item == mCurrentStep -> {
                background = mCurrentBackground
                width = mCurrentWidth
                tvCurrentStep!!.setTextColor(context.resources.getColor(currentTextColor))
            }
            else -> {
                background = mNormalBackground
                tvCurrentStep!!.setTextColor(context.resources.getColor(normalTextColor))
            }
        }
        tvCurrentStep!!.gravity = Gravity.CENTER
        tvCurrentStep!!.textSize = textSize
        if (contentText.isNotEmpty())
            tvCurrentStep!!.text = contentText[item]
        else
            tvCurrentStep!!.text = (item + 1).toString()

        val params = LayoutParams(width, width)
        if (item > 0)
            params.leftMargin = mSpaceBetween
        tvCurrentStep!!.layoutParams = params
        addView(tvCurrentStep)
        if (lineView != null) {
            addView(lineView)
            lineView = null
        }
        if (tvCurrentStep is ViewGroup)
            tvCurrentStep = getChildAt(0) as TextView
        tvCurrentStep!!.setBackgroundResource(background)
    }
}

/**
 * 從Builder中獲取到資料
 */
fun setData(barBuilder: BarBuilder) {
    this.mCurrentBackground = barBuilder.mCurrentBackground
    this.mPassedBackground = barBuilder.mPassedBackground
    this.mNormalBackground = barBuilder.mNormalBackground
    this.mSpaceBetween = barBuilder.mSpaceBetween
    this.mNormalWidth = barBuilder.mNormalWidth
    this.mCurrentWidth = barBuilder.mCurrentWidth
    this.mCurrentStep = barBuilder.mCurrentStep
    this.mStepCount = barBuilder.mStepCount
    this.mLineWidth = barBuilder.mLineWidth
    this.mLineHeight = barBuilder.mLineHeight
    this.isShow = barBuilder.isShow
    this.lineColor = barBuilder.lineColor
    this.currentTextColor = barBuilder.currentTextColor
    this.passTextColor = barBuilder.passTextColor
    this.normalTextColor = barBuilder.normalTextColor
    this.textSize = barBuilder.textSize
    this.contentText = barBuilder.contentText
}

/**
 * 建造者模式類 ---------------------------------------------------------------------------
 */
inner class BarBuilder {
    var mCurrentBackground: Int = R.drawable.shape_circle_step //當前圓圈背景色
    var mPassedBackground: Int = R.drawable.shape_circle_white //通過的圓圈背景色
    var mNormalBackground: Int = R.drawable.shape_circle_gray //未通過的圓圈背景色
    var mSpaceBetween: Int = 25 //間隔
    var mNormalWidth: Int = 36 //未通過的寬度
    var mCurrentWidth: Int = 38 //當前的寬度
    var mCurrentStep: Int = 0 //預設當前步驟下標為0
    var mStepCount: Int = 3 //預設總共3個步驟
    var mLineWidth: Int = 20 //間隔線寬度 預設是20
    var mLineHeight: Int = 1 //間隔線高度 預設是1
    var isShow: Boolean = true //是否顯示分隔線
    var lineColor: Int = R.color.colorPrimary //間隔線顏色
    var currentTextColor: Int = R.color.colorPrimary //當前步驟的字型顏色
    var passTextColor: Int = R.color.colorPrimary //通過的步驟的字型顏色
    var normalTextColor: Int = R.color.colorPrimary //未通過的步驟的字型顏色
    var textSize: Float = 13f //步驟的字型顏色
    var contentText = emptyArray<String>() //設定文字內容

    /**
     * 動態設定多少步驟
     */
    fun setUp(stepCount: Int, currentStep: Int): BarBuilder {
        this.mStepCount = stepCount
        if (currentStep > 0)
            this.mCurrentStep = currentStep - 1
        return this
    }

    /**
     * 設定分割線的寬度
     */
    fun setLineWidth(width: Float, height: Float): BarBuilder {
        mLineWidth = dp2px(width)
        mLineHeight = dp2px(height)
        return this
    }

    fun setTextSize(size: Float): BarBuilder {
        this.textSize = size
        return this
    }

    /**
     * 設定圓圈背景色
     */
    fun setBackground(currentBg: Int, passedBg: Int, normalBg: Int): BarBuilder {
        mCurrentBackground = currentBg
        mPassedBackground = passedBg
        mNormalBackground = normalBg
        return this
    }

    /**
     * 設定圓圈的大小
     */
    fun setCircleWidth(currentWidth: Int, normalWidth: Int): BarBuilder {
        mCurrentWidth = currentWidth //當前步驟圓圈大小
        mNormalWidth = normalWidth //非當前步驟圓圈大小
        return this
    }

    /**
     * 是否顯示間隔線
     */
    fun isShowLine(isShow: Boolean): BarBuilder {
        this.isShow = isShow
        return this
    }

    /**
     * 設定間隔線的顏色
     */
    fun setLineColor(color: Int): BarBuilder {
        this.lineColor = color
        return this
    }

    /**
     * 設定步驟文字內容
     */
    fun setContent(content: Array<String>): BarBuilder {
        if (content.size != mStepCount)
            return this
        else
            contentText = content
        return this
    }

    /**
     * 設定圓圈跟分隔線的間距或是圓圈跟圓圈之間的間距
     */
    fun setSpace(space: Int): BarBuilder {
        mSpaceBetween = space
        return this
    }

    /**
     * 設定字型的顏色
     */
    fun setTextColor(currentTextColor: Int, passTextColor: Int, normalTextColor: Int): BarBuilder {
        this.currentTextColor = currentTextColor
        this.passTextColor = passTextColor
        this.normalTextColor = normalTextColor
        return this
    }

    fun build(): RegisterStepsBar {
        [email protected](this)
        return this@RegisterStepsBar
    }
}

}

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