Android Activity通用悬浮可拖拽View封装的思路详解
目录
1，背景
2，思路
2.1，封装通用的基础悬浮View
2.1，继承通用View
2.3，设计view的控制器
2.4，view的添加和使用
1，背景在开发中总会遇到一个可拖拽的悬浮View，不管是在开发中，还是在线上，都时长有这样的控件，我们通常遇到这种情况，经常需要自己封装，需要耗费时间，我这边封装了一个可以通用的悬浮可拖拽View，这样使用的时候，只需要传入自己要设计的样式和位置既可
2，思路 2.1，封装通用的基础悬浮View设计通用的父View
1，传入的childView是可以自定义layout，可以传入任何样式
childView = setChildView()
2，可以设置初始的位置
layoutParams = setChildInitLayoutParams()
3，可以修改自定义view控件
setChildAction(childView)
4，提供点击事件处理
protected abstract fun setEventClick()
子view继承父view就可以实现自己想要的功能了
abstract class AbsParentDragView : FrameLayout, View.OnTouchListener {
//需要添加的子控件
private var childView: View? = null
//子控件的宽
protected var childWidth: Int = 0
//子控件的高
protected var childHeight: Int = 0
//子控件的位置属性
lateinit var layoutParams: LayoutParams
//点击区域偏移量
private var regionW: Int = 0
//判断是否可以移动
private var isCanMove: Boolean = false
private val MIN_TAP_TIME = 1000
private val MIN_DISTANCE_MOVE = 4
private var mState = TouchState.STATE_STOP
private var distance: Int = 0
private enum class TouchState {
STATE_MOVE, STATE_STOP
}
constructor(context: Context) : super(context) {
initView()
}
constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
initView()
}
constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(
context,
attrs,
defStyleAttr
) {
initView()
}
private fun initView() {
childView = setChildView()
setChildAction(childView)
addView(childView)
setOnTouchListener(this)
layoutParams = LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)
regionW = DensityUtil.dip2px(context, 3f)
distance = DensityUtil.dip2px(context,1f) * MIN_DISTANCE_MOVE
post {
childView?.width?.let {
childWidth = it
}
childView?.height?.let {
childHeight = it
}
layoutParams = setChildInitLayoutParams()
initLayoutParams()
}
}
protected abstract fun setChildView(): View?
protected abstract fun setChildInitLayoutParams(): FrameLayout.LayoutParams
protected abstract fun setChildAction(childView: View?)
private fun initLayoutParams() {
layoutParams.gravity = Gravity.LEFT or Gravity.TOP
childView?.layoutParams = layoutParams
}
private fun updateLayoutParams(dx: Int, dy: Int) {
layoutParams.gravity = Gravity.LEFT or Gravity.TOP
layoutParams.leftMargin = dx - childWidth / 2
layoutParams.topMargin = dy - childHeight / 2 - StateUtils.getStatusBarHeight(context)
childView?.layoutParams = layoutParams
}
private var mStartX:Int = 0
private var mStartY:Int = 0
override fun onTouch(view: View, event: MotionEvent): Boolean {
val x = event.rawX.toInt()
val y = event.rawY.toInt()
when(event.action){
MotionEvent.ACTION_DOWN -> {
mStartX = x
mStartY = y
if (isPointChoice(x, y)) {
isCanMove = true
}
}
MotionEvent.ACTION_MOVE -> {
if (Math.abs(x - mStartX) < distance
&& Math.abs(y - mStartY) < distance) {
if (mState == TouchState.STATE_STOP) {
return true
//break
}
} else if (mState != TouchState.STATE_MOVE) {
mState = TouchState.STATE_MOVE
}
if(isCanMove){
updateLayoutParams(x, y)
}
mState = TouchState.STATE_MOVE
}
MotionEvent.ACTION_UP -> {
isCanMove = false
if (mState != TouchState.STATE_MOVE
&& event.eventTime - event.downTime < MIN_TAP_TIME) {
setEventClick()
}
mState = TouchState.STATE_STOP
}
}
return isCanMove
}
protected abstract fun setEventClick()
private fun isPointChoice(x: Int, y: Int): Boolean {
val cLocation = IntArray(2)
childView?.getLocationOnScreen(cLocation)
val horizontalMatch =
x > (cLocation[0] + regionW) && x < (cLocation[0] + childWidth + regionW)
val verticalMatch =
y < (cLocation[1] + childHeight + DensityUtil.dip2px(context,10f)) && y > (cLocation[1] - regionW)
if (horizontalMatch && verticalMatch) {
return true
}
return false
}
}
2.1，继承通用View
class DemoLineView(context: Context, attrs: AttributeSet?) : AbsParentDragView(context, attrs) {
override fun setChildView(): View? {
return LayoutInflater.from(context).inflate(R.layout.layout_draw_item, this, false)
}
override fun setChildInitLayoutParams(): LayoutParams {
layoutParams.topMargin = DensityUtil.getScreenHeight(
context
) - childHeight - DensityUtil.dip2px(context, 80f)
layoutParams.leftMargin = DensityUtil.getScreenWidth(
context
) - childWidth - DensityUtil.dip2px(context, 20f)
return layoutParams
}
override fun setChildAction(childView: View?) {
val tvSafeLine = childView?.findViewById<TextView>(R.id.tvSafeLine)
tvSafeLine?.text = "设置悬浮"
}
override fun setEventClick() {
Toast.makeText(context,"悬浮view",Toast.LENGTH_LONG).show()
}
}
2.3，设计view的控制器
open class DragViewManager private constructor(context: Activity) {
private var activity: Activity = context
companion object : SingletonHolder<DragViewManager, Activity>(::DragViewManager)
private lateinit var dragView: AbsParentDragView
private val contentView = activity.window.decorView.findViewById<View>(android.R.id.content) as FrameLayout
fun create(dragView: AbsParentDragView){
this.dragView = dragView
if(contentView.contains(dragView)){
contentView.removeView(dragView)
}
contentView.addView(dragView)
}
fun show(){
dragView.visibility = View.VISIBLE
}
fun dismiss(){
dragView.visibility = View.INVISIBLE
}
}
2.4，view的添加和使用
//创建出要显示的View
DragViewManager.getInstance(this).create(new DemoLineView(this,null));
//隐藏要显示的View
DragViewManager.getInstance(this).dismiss();
//显示要显示的View
DragViewManager.getInstance(this).show();
代码链接地址：gitee.com/component_i…
到此这篇关于Android Activity通用悬浮可拖拽View封装的文章就介绍到这了,更多相关Android Activity拖拽View封装内容请搜索软件开发网以前的文章或继续浏览下面的相关文章希望大家以后多多支持软件开发网！
