如何通過偏好以編程方式交換Kotlin中的2個按鈕位置？

所以，我有 2 個按鈕，我想通過使用偏好來交換它們，但是是的，我不能讓它們正確切換

這是我的偏好代碼

    // In MainActivity.kt

    override fun onResume() {
        super.onResume()
        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this)
        val shouldFlipButtonPosition = sharedPreferences.getBoolean("buttonpositions", false)
        if (isButtonPositionFlipped != shouldFlipButtonPosition) {
            isButtonPositionFlipped = shouldFlipButtonPosition
            val cleanBtn = findViewById<Button>(R.id.cleanBtn)
            val analyzeBtn = findViewById<Button>(R.id.analyzeBtn)
            if (isButtonPositionFlipped) {

                // Buttons swaped.

            } else {

               // Buttons back to normal.

            }
        }

我再次嘗試讓它們交換，但我得到了一些像這樣的丑陋結果：

    override fun onResume() {
        super.onResume()
        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this)
        val shouldFlipButtonPosition = sharedPreferences.getBoolean("buttonpositions", false)
        if (isButtonPositionFlipped != shouldFlipButtonPosition) {
            isButtonPositionFlipped = shouldFlipButtonPosition
            val cleanBtn = findViewById<Button>(R.id.cleanBtn)
            val analyzeBtn = findViewById<Button>(R.id.analyzeBtn)
            if (isButtonPositionFlipped) {
                val posX = cleanBtn.x
                val posY = cleanBtn.y
                analyzeBtn.x = posX
                analyzeBtn.y = posY
            } else {
                cleanBtn.setPadding(0, 0, 0, 0)
                analyzeBtn.setPadding(0, 0, 0, 0)
            }
        }
    }

    override fun onResume() {
        super.onResume()
        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this)
        val shouldFlipButtonPosition = sharedPreferences.getBoolean("buttonpositions", false)
        if (isButtonPositionFlipped != shouldFlipButtonPosition) {
            isButtonPositionFlipped = shouldFlipButtonPosition
            val cleanBtn = findViewById<Button>(R.id.cleanBtn)
            val analyzeBtn = findViewById<Button>(R.id.analyzeBtn)
            if (isButtonPositionFlipped) {
                cleanBtn.setPadding(640, 0, 0, 0)
                analyzeBtn.setPadding(0, 0, 640, 0)
            } else {
                cleanBtn.setPadding(0, 0, 0, 0)
                analyzeBtn.setPadding(0, 0, 0, 0)
            }
        }
    }

我不得不提到我嘗試使用set.Margins但不作業

如何使用此方法交換它們？

uj5u.com熱心網友回復：

如果它們在 LinearLayout 中并且它們是該 LinearLayout 的唯一兩個子視圖，則可以像這樣顛倒子視圖的順序：

findViewById<LinearLayout>(R.id.theParentLinearLayout).apply {
    val children = children.toList()
    removeAllViews()
    for (child in children.asReversed()) {
        addView(child)
    }
}

如果它們需要不同大小的邊距，您也可以交換它們的布局引數：

findViewById<LinearLayout>(R.id.theParentLinearLayout).apply {
    val children = children.toList()
    children[0].layoutParams = children[1].layoutParams
        .also { children[1].layoutParams = children[0].layoutParams }
    removeAllViews()
    for (child in children.asReversed()) {
        addView(child)
    }
}

如果有兩個以上的子視圖，您可以在可變串列中搜索并交換它們，然后再將它們全部添加回父視圖。

findViewById<LinearLayout>(R.id.theParentLinearLayout).apply {
    val children = children.toMutableList()
    val buttonAIndex = children.indexOf(findViewById(R.id.buttonA))
    val buttonBIndex = children.indexOf(findViewById(R.id.buttonB))
    children[buttonAIndex] = children[buttonBIndex]
        .also { children[buttonBIndex] = children[buttonAIndex] }
    children[buttonAIndex].layoutParams = children[buttonBIndex].layoutParams
        .also { children[buttonBIndex].layoutParams = children[buttonAIndex].layoutParams }
    removeAllViews()
    for (child in children) {
        addView(child)
    }
}

uj5u.com熱心網友回復：

嘗試使用RelativeLayout（或ConstraintLayout）：

   override fun onResume() {
        super.onResume()
        val cleanBtn = findViewById<Button>(R.id.cleanBtn);
        val analyzeBtn = findViewById<Button>(R.id.analyzeBtn);
        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this)
        val shouldFlipButtonPosition = sharedPreferences.getBoolean("buttonpositions", false)
        var isButtonPositionFlipped = true;
        if (isButtonPositionFlipped != shouldFlipButtonPosition) {
            isButtonPositionFlipped = shouldFlipButtonPosition;
            (cleanBtn.layoutParams as RelativeLayout.LayoutParams).leftMargin =
                dipToPixels(this, 100f);//100dp?
            (analyzeBtn.layoutParams as RelativeLayout.LayoutParams).leftMargin = 0;
        } else {
            (cleanBtn.layoutParams as RelativeLayout.LayoutParams).leftMargin = 0;
            (analyzeBtn.layoutParams as RelativeLayout.LayoutParams).leftMargin =
                dipToPixels(this, 100f);//100dp?
        }
    }

    private fun dipToPixels(context: Context, dipValue: Float): Int {
        val metrics: DisplayMetrics = context.resources.displayMetrics
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dipValue, metrics).toInt()
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    tools:context=".TestActivity">

    <Button
        android:id="@ id/cleanBtn"
        android:layout_width="wrap_content"
        android:text="111"
        android:layout_height="wrap_content"></Button>

    <Button
        android:id="@ id/analyzeBtn"
        android:layout_marginLeft="100dp"
        android:layout_width="wrap_content"
        android:text="222"
        android:layout_height="wrap_content"></Button>

</RelativeLayout>

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