Convert NumberPickerPreference

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app/src/main/java/com/github/shadowsocks/preferences/NumberPickerPreference.kt

@@ -0,0 +1,92 @@
+package com.github.shadowsocks.preferences
+
+import android.content.*
+import android.content.res.*
+import android.os.*
+import android.util.*
+import android.view.*
+import android.widget.*
+import com.github.shadowsocks.*
+
+class NumberPickerPreference(context: Context, attrs: AttributeSet) : SummaryDialogPreference(context, attrs)
+{
+	private val picker: NumberPicker = NumberPicker(context)
+
+	var value: Int = 0
+		set(i)
+		{
+			if (i == value)
+			{
+				return
+			}
+			picker.value = i
+			field = picker.value
+			persistInt(this.value)
+			notifyChanged()
+		}
+
+	var min: Int
+		get() = picker.minValue
+		set(value)
+		{
+			picker.minValue = value
+		}
+
+	init
+	{
+		val a = context.obtainStyledAttributes(attrs, R.styleable.NumberPickerPreference)
+		min = a.getInt(R.styleable.NumberPickerPreference_min, 0)
+		setMax(a.getInt(R.styleable.NumberPickerPreference_max, Integer.MAX_VALUE - 1))
+		a.recycle()
+	}
+
+	private fun setMax(value: Int)
+	{
+		picker.maxValue = value
+	}
+
+	override fun showDialog(state: Bundle?)
+	{
+		super.showDialog(state)
+		val window = dialog.window
+		window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
+	}
+
+	override fun onCreateDialogView(): View
+	{
+		val parent = picker.parent as ViewGroup?
+		parent?.removeView(picker)
+		return picker
+	}
+
+	override fun onDialogClosed(positiveResult: Boolean)
+	{
+		picker.clearFocus()
+		super.onDialogClosed(positiveResult)
+
+		if (positiveResult)
+		{
+			val value = picker.value
+			if (callChangeListener(value))
+			{
+				this.value = value
+				return
+			}
+		}
+		picker.value = this.value
+	}
+
+	override fun onGetDefaultValue(a: TypedArray, index: Int): Any
+	{
+		return a.getInt(index, min)
+	}
+
+	override fun onSetInitialValue(restorePersistedValue: Boolean, defaultValue: Any)
+	{
+		val defValue = defaultValue as Int
+		this.value = if (restorePersistedValue) getPersistedInt(defValue) else defValue
+	}
+
+	override val summaryValue: Any?
+		get() = value
+}

app/src/main/java/com/github/shadowsocks/preferences/SummaryDialogPreference.kt

@@ -0,0 +1,16 @@
+package com.github.shadowsocks.preferences
+
+import android.content.*
+import android.preference.*
+import android.util.*
+import java.util.*
+
+abstract class SummaryDialogPreference internal constructor(context: Context, attrs: AttributeSet) : DialogPreference(context, attrs)
+{
+	abstract val summaryValue: Any?
+
+	override fun getSummary(): CharSequence
+	{
+		return String.format(Locale.ENGLISH, super.getSummary().toString(), summaryValue)
+	}
+}