Draggable Floating Button in Flutter.

In this blog, we will learn how the Draggable Floating Button Floats all over the screen in Flutter.

A floating action button (FAB) is a circular button that triggers the primary action in your app’s UI. This page shows you how to add the FAB to your layout, customize some of its appearances, and respond to button taps. We can enhance our app more flexible by using Draggable Floating Button Floats all over the screen in Flutter.

Let’s understand with an example.

It is a circular button that triggers the primary action in our app’s UI.

1.) Firstly we have to make the floating button and Service class.

Manifest:

Add SYSTEM_ALERT_WINDOW permission in the Manifest.

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

1	<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

<service
    android:name=".FloatingWidgetService"
    android:enabled="true"
    android:exported="false" />

<service

android:name=".FloatingWidgetService"

android:enabled="true"

android:exported="false" />

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:padding="10dp"
    android:background="@android:color/holo_blue_bright">

    <Button
        android:id="@+id/floating_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClickFloatingButton"
        android:text="@string/generate_floating"
        android:textColor="@color/white"
        android:textSize="16sp"
        android:layout_margin="20dp"
        android:background="@android:color/holo_blue_dark"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

xmlns:app="http://schemas.android.com/apk/res-auto"

android:padding="10dp"

android:background="@android:color/holo_blue_bright">

<Button

android:id="@+id/floating_button"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:onClick="onClickFloatingButton"

android:text="@string/generate_floating"

android:textColor="@color/white"

android:textSize="16sp"

android:layout_margin="20dp"

android:background="@android:color/holo_blue_dark"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

floating_widget_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <RelativeLayout
        android:id="@+id/root_layout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <RelativeLayout
            android:id="@+id/relative_collapse"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:visibility="visible">

            <ImageView
                android:id="@+id/image_collapsed"
                android:layout_width="70dp"
                android:layout_height="70dp"
                android:layout_marginTop="8dp"
                android:src="@mipmap/ic_launcher_round"
                tools:ignore="ContentDescription" />

            <ImageView
                android:id="@+id/image_close_floating"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="50dp"
                android:layout_marginTop="5dp"
                android:background="@drawable/circle_shape"
                android:src="@drawable/ic_close_white"
                tools:ignore="ContentDescription" />
        </RelativeLayout>

        <LinearLayout
            android:id="@+id/linear_expanded"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@color/white"
            android:gravity="center"
            android:orientation="horizontal"
            android:padding="8dp"
            android:visibility="gone">

            <ImageView
                android:id="@+id/image_floating"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/ic_baseline_access_alarm_24" />

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="10dp"
                android:orientation="vertical"
                android:layout_marginLeft="10dp">

                <TextView
                    android:id="@+id/text_title_floating"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center_vertical"
                    android:text="@string/draggable_button"
                    android:textColor="@android:color/black"
                    android:textSize="14sp" />

                <TextView
                    android:id="@+id/text_floating_detail"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center_vertical"
                    android:text="@string/draggable_details"
                    android:textColor="@android:color/darker_gray"
                    android:textSize="11sp" />
            </LinearLayout>

            <ImageView
                android:id="@+id/image_close_float"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:padding="10dp"
                android:src="@drawable/ic_close_black" />

            <ImageView
                android:id="@+id/image_open"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:padding="10dp"
                android:src="@drawable/ic_open_view" />
        </LinearLayout>
    </RelativeLayout>
</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="wrap_content"

android:layout_height="wrap_content">

<RelativeLayout

android:id="@+id/root_layout"

android:layout_width="wrap_content"

android:layout_height="wrap_content">

<RelativeLayout

android:id="@+id/relative_collapse"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical"

android:visibility="visible">

<ImageView

android:id="@+id/image_collapsed"

android:layout_width="70dp"

android:layout_height="70dp"

android:layout_marginTop="8dp"

android:src="@mipmap/ic_launcher_round"

tools:ignore="ContentDescription" />

<ImageView

android:id="@+id/image_close_floating"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="50dp"

android:layout_marginTop="5dp"

android:background="@drawable/circle_shape"

android:src="@drawable/ic_close_white"

tools:ignore="ContentDescription" />

</RelativeLayout>

<LinearLayout

android:id="@+id/linear_expanded"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="@color/white"

android:gravity="center"

android:orientation="horizontal"

android:padding="8dp"

android:visibility="gone">

<ImageView

android:id="@+id/image_floating"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/ic_baseline_access_alarm_24" />

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginStart="10dp"

android:orientation="vertical"

android:layout_marginLeft="10dp">

<TextView

android:id="@+id/text_title_floating"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center_vertical"

android:text="@string/draggable_button"

android:textColor="@android:color/black"

android:textSize="14sp" />

<TextView

android:id="@+id/text_floating_detail"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center_vertical"

android:text="@string/draggable_details"

android:textColor="@android:color/darker_gray"

android:textSize="11sp" />

</LinearLayout>

<ImageView

android:id="@+id/image_close_float"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:padding="10dp"

android:src="@drawable/ic_close_black" />

<ImageView

android:id="@+id/image_open"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:padding="10dp"

android:src="@drawable/ic_open_view" />

</LinearLayout>

</RelativeLayout>

</FrameLayout>

remove_floating_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/remove_relativelayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp">

    <ImageView
        android:id="@+id/image_remove"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:background="@drawable/white_circle_shape"
        android:padding="10dp"
        android:src="@drawable/ic_close_white"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

android:id="@+id/remove_relativelayout"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:padding="10dp">

<ImageView

android:id="@+id/image_remove"

android:layout_width="70dp"

android:layout_height="70dp"

android:background="@drawable/white_circle_shape"

android:padding="10dp"

android:src="@drawable/ic_close_white"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

2.) We can add the drawable resource layout below:

ic_baseline_access_alarm_24.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24">
  <path
      android:fillColor="@android:color/black"
      android:pathData="M22,5.72l-4.6,-3.86 -1.29,1.53 4.6,3.86L22,5.72zM7.88,3.39L6.6,1.86 2,5.71l1.29,1.53 4.59,-3.85zM12.5,8L11,8v6l4.75,2.85 0.75,-1.23 -4,-2.37L12.5,8zM12,4c-4.97,0 -9,4.03 -9,9s4.02,9 9,9c4.97,0 9,-4.03 9,-9s-4.03,-9 -9,-9zM12,20c-3.87,0 -7,-3.13 -7,-7s3.13,-7 7,-7 7,3.13 7,7 -3.13,7 -7,7z"/>
</vector>

<vector xmlns:android="http://schemas.android.com/apk/res/android"

android:width="24dp"

android:height="24dp"

android:viewportWidth="24"

android:viewportHeight="24">

<path

android:fillColor="@android:color/black"

android:pathData="M22,5.72l-4.6,-3.86 -1.29,1.53 4.6,3.86L22,5.72zM7.88,3.39L6.6,1.86 2,5.71l1.29,1.53 4.59,-3.85zM12.5,8L11,8v6l4.75,2.85 0.75,-1.23 -4,-2.37L12.5,8zM12,4c-4.97,0 -9,4.03 -9,9s4.02,9 9,9c4.97,0 9,-4.03 9,-9s-4.03,-9 -9,-9zM12,20c-3.87,0 -7,-3.13 -7,-7s3.13,-7 7,-7 7,3.13 7,7 -3.13,7 -7,7z"/>

</vector>

ic_close_black.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z"/>
</vector>

<vector xmlns:android="http://schemas.android.com/apk/res/android"

android:width="24dp"

android:height="24dp"

android:viewportWidth="24.0"

android:viewportHeight="24.0">

<path

android:fillColor="#FF000000"

android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z"/>

</vector>

ic_close_white.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportHeight="24.0"
    android:viewportWidth="24.0">
    <path
        android:fi.xmlllColor="#FFFFFFFF"
        android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z" />
</vector>

<vector xmlns:android="http://schemas.android.com/apk/res/android"

android:width="24dp"

android:height="24dp"

android:viewportHeight="24.0"

android:viewportWidth="24.0">

<path

android:fi.xmlllColor="#FFFFFFFF"

android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z" />

</vector>

ic_open_view.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M19,12h-2v3h-3v2h5v-5zM7,9h3L10,7L5,7v5h2L7,9zM21,3L3,3c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h18c1.1,0 2,-0.9 2,-2L23,5c0,-1.1 -0.9,-2 -2,-2zM21,19.01L3,19.01L3,4.99h18v14.02z"/>
</vector>

<vector xmlns:android="http://schemas.android.com/apk/res/android"

android:width="24dp"

android:height="24dp"

android:viewportWidth="24.0"

android:viewportHeight="24.0">

<path

android:fillColor="#FF000000"

android:pathData="M19,12h-2v3h-3v2h5v-5zM7,9h3L10,7L5,7v5h2L7,9zM21,3L3,3c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h18c1.1,0 2,-0.9 2,-2L23,5c0,-1.1 -0.9,-2 -2,-2zM21,19.01L3,19.01L3,4.99h18v14.02z"/>

</vector>

white_circle_shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <stroke
        android:width="1dp"
        android:color="@android:color/white" />


</shape>

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

android:shape="oval">

<stroke

android:width="1dp"

android:color="@android:color/white" />

</shape>

3.) The Kotlin service classes :

FloatingWidgetService.kt

class FloatingWidgetService : Service(), View.OnClickListener {
    private var mWindowManager: WindowManager? = null
    private var mFloatingWidgetView: View? = null
    private var collapsedView: View? = null
    private var expandedView: View? = null
    private var remove_image_view: ImageView? = null
    private val szWindow = Point()
    private var removeFloatingWidgetView: View? = null
    private var x_init_cord = 0
    private var y_init_cord = 0
    private var x_init_margin = 0
    private var y_init_margin = 0

    private var isLeft = true
    override fun onBind(intent: Intent): IBinder? {
        return null
    }

    override fun onCreate() {
        super.onCreate()

        mWindowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManager
        windowManagerDefaultDisplay

        val inflater = getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
        addRemoveView(inflater)
        addFloatingWidgetView(inflater)
        implementClickListeners()
        implementTouchListenerToFloatingWidgetView()
    }

    private fun addRemoveView(inflater: LayoutInflater): View? {
        removeFloatingWidgetView = inflater.inflate(R.layout.remove_floating_layout, null)

        val paramRemove: WindowManager.LayoutParams
        paramRemove = if (Build.VERSION.SDK_INT &lt; Build.VERSION_CODES.O) {
            WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_PHONE,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT)
        } else {
            WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT)
        }

        paramRemove.gravity = Gravity.TOP or Gravity.LEFT

        removeFloatingWidgetView?.setVisibility(View.GONE)
        remove_image_view = removeFloatingWidgetView?.findViewById&lt;View&gt;(R.id.image_remove) as ImageView

        mWindowManager!!.addView(removeFloatingWidgetView, paramRemove)
        return remove_image_view
    }

    private fun addFloatingWidgetView(inflater: LayoutInflater) {
        //Inflate the floating view layout we created
        mFloatingWidgetView = inflater.inflate(R.layout.floating_widget_layout, null)

        val params: WindowManager.LayoutParams
        params = if (Build.VERSION.SDK_INT &lt; Build.VERSION_CODES.O) {
            WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_PHONE,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT)
        } else {
            WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT)
        }


        params.gravity = Gravity.TOP or Gravity.LEFT

        params.x = 0
        params.y = 100

        mWindowManager!!.addView(mFloatingWidgetView, params)

        collapsedView = mFloatingWidgetView?.findViewById(R.id.image_collapsed)

        expandedView = mFloatingWidgetView?.findViewById(R.id.linear_expanded)
    }

    private val windowManagerDefaultDisplay: Unit
        private get() {
            if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB_MR2) mWindowManager!!.defaultDisplay.getSize(szWindow) else {
                val w = mWindowManager!!.defaultDisplay.width
                val h = mWindowManager!!.defaultDisplay.height
                szWindow[w] = h
            }
        }

    private fun implementTouchListenerToFloatingWidgetView() {
        mFloatingWidgetView!!.findViewById&lt;View&gt;(R.id.root_layout).setOnTouchListener(object : OnTouchListener {
            var time_start: Long = 0
            var time_end: Long = 0
            var isLongClick = false
            var inBounded = false
            var remove_img_width = 0
            var remove_img_height = 0
            var handler_longClick = Handler()
            var runnable_longClick = Runnable {

                isLongClick = true

                removeFloatingWidgetView!!.visibility = View.VISIBLE
                onFloatingWidgetLongClick()
            }

            override fun onTouch(v: View, event: MotionEvent): Boolean {

                val layoutParams = mFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams

                val x_cord = event.rawX.toInt()
                val y_cord = event.rawY.toInt()
                val x_cord_Destination: Int
                var y_cord_Destination: Int
                when (event.action) {
                    MotionEvent.ACTION_DOWN -&gt; {
                        time_start = System.currentTimeMillis()
                        handler_longClick.postDelayed(runnable_longClick, 600)
                        remove_img_width = remove_image_view!!.layoutParams.width
                        remove_img_height = remove_image_view!!.layoutParams.height
                        x_init_cord = x_cord
                        y_init_cord = y_cord

                        x_init_margin = layoutParams.x
                        y_init_margin = layoutParams.y
                        return true
                    }
                    MotionEvent.ACTION_UP -&gt; {
                        isLongClick = false
                        removeFloatingWidgetView!!.visibility = View.GONE
                        remove_image_view!!.layoutParams.height = remove_img_height
                        remove_image_view!!.layoutParams.width = remove_img_width
                        handler_longClick.removeCallbacks(runnable_longClick)

                        if (inBounded) {
                            stopSelf()
                            inBounded = false
//                             break
                        }


                        val x_diff = x_cord - x_init_cord
                        val y_diff = y_cord - y_init_cord


                        if (Math.abs(x_diff) &lt; 5 &amp;&amp; Math.abs(y_diff) &lt; 5) {
                            time_end = System.currentTimeMillis()

                            if (time_end - time_start &lt; 300) onFloatingWidgetClick()
                        }
                        y_cord_Destination = y_init_margin + y_diff
                        val barHeight = statusBarHeight
                        if (y_cord_Destination &lt; 0) {
                            y_cord_Destination = 0
                        } else if (y_cord_Destination + (mFloatingWidgetView!!.height + barHeight) &gt; szWindow.y) {
                            y_cord_Destination = szWindow.y - (mFloatingWidgetView!!.height + barHeight)
                        }
                        layoutParams.y = y_cord_Destination
                        inBounded = false
                    }
                    MotionEvent.ACTION_MOVE -&gt; {
                        val x_diff_move = x_cord - x_init_cord
                        val y_diff_move = y_cord - y_init_cord
                        x_cord_Destination = x_init_margin + x_diff_move
                        y_cord_Destination = y_init_margin + y_diff_move

                        if (isLongClick) {
                            val x_bound_left = szWindow.x / 2 - (remove_img_width * 1.5).toInt()
                            val x_bound_right = szWindow.x / 2 + (remove_img_width * 1.5).toInt()
                            val y_bound_top = szWindow.y - (remove_img_height * 1.5).toInt()

                            if (x_cord &gt;= x_bound_left &amp;&amp; x_cord &lt;= x_bound_right &amp;&amp; y_cord &gt;= y_bound_top) {
                                inBounded = true
                                val x_cord_remove = ((szWindow.x - remove_img_height * 1.5) / 2).toInt()
                                val y_cord_remove = (szWindow.y - (remove_img_width * 1.5 + statusBarHeight)).toInt()
                                if (remove_image_view!!.layoutParams.height == remove_img_height) {
                                    remove_image_view!!.layoutParams.height = (remove_img_height * 1.5).toInt()
                                    remove_image_view!!.layoutParams.width = (remove_img_width * 1.5).toInt()
                                    val param_remove = removeFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams
                                    param_remove.x = x_cord_remove
                                    param_remove.y = y_cord_remove
                                    mWindowManager!!.updateViewLayout(removeFloatingWidgetView, param_remove)
                                }
                                layoutParams.x = x_cord_remove + Math.abs(removeFloatingWidgetView!!.width - mFloatingWidgetView!!.width) / 2
                                layoutParams.y = y_cord_remove + Math.abs(removeFloatingWidgetView!!.height - mFloatingWidgetView!!.height) / 2

                                mWindowManager!!.updateViewLayout(mFloatingWidgetView, layoutParams)
//                                break
                            } else {
                                inBounded = false
                                remove_image_view!!.layoutParams.height = remove_img_height
                                remove_image_view!!.layoutParams.width = remove_img_width
                                onFloatingWidgetClick()
                            }
                        }
                        layoutParams.x = x_cord_Destination
                        layoutParams.y = y_cord_Destination

                        mWindowManager!!.updateViewLayout(mFloatingWidgetView, layoutParams)
                        return true
                    }
                }
                return false
            }
        })
    }

    private fun implementClickListeners() {
        mFloatingWidgetView!!.findViewById&lt;View&gt;(R.id.image_close_float).setOnClickListener(this)
        mFloatingWidgetView!!.findViewById&lt;View&gt;(R.id.linear_expanded).setOnClickListener(this)
        mFloatingWidgetView!!.findViewById&lt;View&gt;(R.id.image_open).setOnClickListener(this)
    }

    override fun onClick(v: View) {
        when (v.id) {
            R.id.image_close_float -&gt;
                stopSelf()
            R.id.image_close_float -&gt; {
                collapsedView!!.visibility = View.VISIBLE
                expandedView!!.visibility = View.GONE
            }
            R.id.image_open
            -&gt; {
                val intent = Intent(this@FloatingWidgetService, MainActivity::class.java)
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                startActivity(intent)

                stopSelf()
            }
        }
    }

    private fun onFloatingWidgetLongClick() {
        val removeParams = removeFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams

        val x_cord = (szWindow.x - removeFloatingWidgetView!!.width) / 2
        val y_cord = szWindow.y - (removeFloatingWidgetView!!.height + statusBarHeight)
        removeParams.x = x_cord
        removeParams.y = y_cord

        mWindowManager!!.updateViewLayout(removeFloatingWidgetView, removeParams)
    }

    private fun resetPosition(x_cord_now: Int) {
        if (x_cord_now &lt;= szWindow.x / 2) {
            isLeft = true
            moveToLeft(x_cord_now)
        } else {
            isLeft = false
            moveToRight(x_cord_now)
        }
    }

    private fun moveToLeft(current_x_cord: Int) {
        val x = szWindow.x - current_x_cord
        object : CountDownTimer(500, 5) {
            var mParams = mFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams
            override fun onTick(t: Long) {
                val step = (500 - t) / 5
                mParams.x = 0 - (current_x_cord * current_x_cord * step).toInt()


                mWindowManager!!.updateViewLayout(mFloatingWidgetView, mParams)
            }

            override fun onFinish() {
                mParams.x = 0

                mWindowManager!!.updateViewLayout(mFloatingWidgetView, mParams)
            }
        }.start()
    }

    private fun moveToRight(current_x_cord: Int) {
        object : CountDownTimer(500, 5) {
            var mParams = mFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams
            override fun onTick(t: Long) {
                val step = (500 - t) / 5
                mParams.x = (szWindow.x + current_x_cord * current_x_cord * step - mFloatingWidgetView!!.width).toInt()

                mWindowManager!!.updateViewLayout(mFloatingWidgetView, mParams)
            }

            override fun onFinish() {
                mParams.x = szWindow.x - mFloatingWidgetView!!.width

                mWindowManager!!.updateViewLayout(mFloatingWidgetView, mParams)
            }
        }.start()
    }

    private fun bounceValue(step: Long, scale: Long): Double {
        return scale * Math.exp(-0.055 * step) * Math.cos(0.08 * step)
    }

    private val isViewCollapsed: Boolean
        private get() = mFloatingWidgetView == null || mFloatingWidgetView!!.findViewById&lt;View&gt;(R.id.image_collapsed).visibility == View.VISIBLE


    private val statusBarHeight: Int
        private get() = Math.ceil(25 * applicationContext.resources.displayMetrics.density.toDouble()).toInt()


    override fun onConfigurationChanged(newConfig: Configuration) {
        super.onConfigurationChanged(newConfig)
        windowManagerDefaultDisplay
        val layoutParams = mFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams
        if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
            if (layoutParams.y + (mFloatingWidgetView!!.height + statusBarHeight) &gt; szWindow.y) {
                layoutParams.y = szWindow.y - (mFloatingWidgetView!!.height + statusBarHeight)
                mWindowManager!!.updateViewLayout(mFloatingWidgetView, layoutParams)
            }
            if (layoutParams.x != 0 &amp;&amp; layoutParams.x &lt; szWindow.x) {
                resetPosition(szWindow.x)
            }
        } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
            if (layoutParams.x &gt; szWindow.x) {
                resetPosition(szWindow.x)
            }
        }
    }


    private fun onFloatingWidgetClick() {
        if (isViewCollapsed) {

            collapsedView!!.visibility = View.GONE
            expandedView!!.visibility = View.VISIBLE
        }
    }

    override fun onDestroy() {
        super.onDestroy()

        if (removeFloatingWidgetView != null) mWindowManager!!.removeView(removeFloatingWidgetView)
    }
}

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class FloatingWidgetService : Service(), View.OnClickListener {

private var mWindowManager: WindowManager? = null

private var mFloatingWidgetView: View? = null

private var collapsedView: View? = null

private var expandedView: View? = null

private var remove_image_view: ImageView? = null

private val szWindow = Point()

private var removeFloatingWidgetView: View? = null

private var x_init_cord = 0

private var y_init_cord = 0

private var x_init_margin = 0

private var y_init_margin = 0

private var isLeft = true

override fun onBind(intent: Intent): IBinder? {

return null

}

override fun onCreate() {

super.onCreate()

mWindowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManager

windowManagerDefaultDisplay

val inflater = getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater

addRemoveView(inflater)

addFloatingWidgetView(inflater)

implementClickListeners()

implementTouchListenerToFloatingWidgetView()

}

private fun addRemoveView(inflater: LayoutInflater): View? {

removeFloatingWidgetView = inflater.inflate(R.layout.remove_floating_layout, null)

val paramRemove: WindowManager.LayoutParams

paramRemove = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {

WindowManager.LayoutParams(

WindowManager.LayoutParams.WRAP_CONTENT,

WindowManager.LayoutParams.TYPE_PHONE,

WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,

PixelFormat.TRANSLUCENT)

} else {

WindowManager.LayoutParams(

WindowManager.LayoutParams.WRAP_CONTENT,

WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,

WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,

PixelFormat.TRANSLUCENT)

}

paramRemove.gravity = Gravity.TOP or Gravity.LEFT

removeFloatingWidgetView?.setVisibility(View.GONE)

remove_image_view = removeFloatingWidgetView?.findViewById<View>(R.id.image_remove) as ImageView

mWindowManager!!.addView(removeFloatingWidgetView, paramRemove)

return remove_image_view

}

private fun addFloatingWidgetView(inflater: LayoutInflater) {

//Inflate the floating view layout we created

mFloatingWidgetView = inflater.inflate(R.layout.floating_widget_layout, null)

val params: WindowManager.LayoutParams

params = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {

WindowManager.LayoutParams(

WindowManager.LayoutParams.WRAP_CONTENT,

WindowManager.LayoutParams.TYPE_PHONE,

WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,

PixelFormat.TRANSLUCENT)

} else {

WindowManager.LayoutParams(

WindowManager.LayoutParams.WRAP_CONTENT,

WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,

WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,

PixelFormat.TRANSLUCENT)

}

params.gravity = Gravity.TOP or Gravity.LEFT

params.x = 0

params.y = 100

mWindowManager!!.addView(mFloatingWidgetView, params)

collapsedView = mFloatingWidgetView?.findViewById(R.id.image_collapsed)

expandedView = mFloatingWidgetView?.findViewById(R.id.linear_expanded)

}

private val windowManagerDefaultDisplay: Unit

private get() {

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) mWindowManager!!.defaultDisplay.getSize(szWindow) else {

val w = mWindowManager!!.defaultDisplay.width

val h = mWindowManager!!.defaultDisplay.height

szWindow[w] = h

}

private fun implementTouchListenerToFloatingWidgetView() {

mFloatingWidgetView!!.findViewById<View>(R.id.root_layout).setOnTouchListener(object : OnTouchListener {

var time_start: Long = 0

var time_end: Long = 0

var isLongClick = false

var inBounded = false

var remove_img_width = 0

var remove_img_height = 0

var handler_longClick = Handler()

var runnable_longClick = Runnable {

isLongClick = true

removeFloatingWidgetView!!.visibility = View.VISIBLE

onFloatingWidgetLongClick()

}

override fun onTouch(v: View, event: MotionEvent): Boolean {

val layoutParams = mFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams

val x_cord = event.rawX.toInt()

val y_cord = event.rawY.toInt()

val x_cord_Destination: Int

var y_cord_Destination: Int

when (event.action) {

MotionEvent.ACTION_DOWN -> {

time_start = System.currentTimeMillis()

handler_longClick.postDelayed(runnable_longClick, 600)

remove_img_width = remove_image_view!!.layoutParams.width

remove_img_height = remove_image_view!!.layoutParams.height

x_init_cord = x_cord

y_init_cord = y_cord

x_init_margin = layoutParams.x

y_init_margin = layoutParams.y

return true

}

MotionEvent.ACTION_UP -> {

isLongClick = false

removeFloatingWidgetView!!.visibility = View.GONE

remove_image_view!!.layoutParams.height = remove_img_height

remove_image_view!!.layoutParams.width = remove_img_width

handler_longClick.removeCallbacks(runnable_longClick)

if (inBounded) {

stopSelf()

inBounded = false

// break

}

val x_diff = x_cord - x_init_cord

val y_diff = y_cord - y_init_cord

if (Math.abs(x_diff) < 5 && Math.abs(y_diff) < 5) {

time_end = System.currentTimeMillis()

if (time_end - time_start < 300) onFloatingWidgetClick()

}

y_cord_Destination = y_init_margin + y_diff

val barHeight = statusBarHeight

if (y_cord_Destination < 0) {

y_cord_Destination = 0

} else if (y_cord_Destination + (mFloatingWidgetView!!.height + barHeight) > szWindow.y) {

y_cord_Destination = szWindow.y - (mFloatingWidgetView!!.height + barHeight)

}

layoutParams.y = y_cord_Destination

inBounded = false

}

MotionEvent.ACTION_MOVE -> {

val x_diff_move = x_cord - x_init_cord

val y_diff_move = y_cord - y_init_cord

x_cord_Destination = x_init_margin + x_diff_move

y_cord_Destination = y_init_margin + y_diff_move

if (isLongClick) {

val x_bound_left = szWindow.x / 2 - (remove_img_width * 1.5).toInt()

val x_bound_right = szWindow.x / 2 + (remove_img_width * 1.5).toInt()

val y_bound_top = szWindow.y - (remove_img_height * 1.5).toInt()

if (x_cord >= x_bound_left && x_cord <= x_bound_right && y_cord >= y_bound_top) {

inBounded = true

val x_cord_remove = ((szWindow.x - remove_img_height * 1.5) / 2).toInt()

val y_cord_remove = (szWindow.y - (remove_img_width * 1.5 + statusBarHeight)).toInt()

if (remove_image_view!!.layoutParams.height == remove_img_height) {

remove_image_view!!.layoutParams.height = (remove_img_height * 1.5).toInt()

remove_image_view!!.layoutParams.width = (remove_img_width * 1.5).toInt()

val param_remove = removeFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams

param_remove.x = x_cord_remove

param_remove.y = y_cord_remove

mWindowManager!!.updateViewLayout(removeFloatingWidgetView, param_remove)

}

layoutParams.x = x_cord_remove + Math.abs(removeFloatingWidgetView!!.width - mFloatingWidgetView!!.width) / 2

layoutParams.y = y_cord_remove + Math.abs(removeFloatingWidgetView!!.height - mFloatingWidgetView!!.height) / 2

mWindowManager!!.updateViewLayout(mFloatingWidgetView, layoutParams)

// break

} else {

inBounded = false

remove_image_view!!.layoutParams.height = remove_img_height

remove_image_view!!.layoutParams.width = remove_img_width

onFloatingWidgetClick()

}

layoutParams.x = x_cord_Destination

layoutParams.y = y_cord_Destination

mWindowManager!!.updateViewLayout(mFloatingWidgetView, layoutParams)

return true

}

return false

}

})

}

private fun implementClickListeners() {

mFloatingWidgetView!!.findViewById<View>(R.id.image_close_float).setOnClickListener(this)

mFloatingWidgetView!!.findViewById<View>(R.id.linear_expanded).setOnClickListener(this)

mFloatingWidgetView!!.findViewById<View>(R.id.image_open).setOnClickListener(this)

}

override fun onClick(v: View) {

when (v.id) {

R.id.image_close_float ->

stopSelf()

R.id.image_close_float -> {

collapsedView!!.visibility = View.VISIBLE

expandedView!!.visibility = View.GONE

}

R.id.image_open

-> {

val intent = Intent(this@FloatingWidgetService, MainActivity::class.java)

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)

startActivity(intent)

stopSelf()

}

private fun onFloatingWidgetLongClick() {

val removeParams = removeFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams

val x_cord = (szWindow.x - removeFloatingWidgetView!!.width) / 2

val y_cord = szWindow.y - (removeFloatingWidgetView!!.height + statusBarHeight)

removeParams.x = x_cord

removeParams.y = y_cord

mWindowManager!!.updateViewLayout(removeFloatingWidgetView, removeParams)

}

private fun resetPosition(x_cord_now: Int) {

if (x_cord_now <= szWindow.x / 2) {

isLeft = true

moveToLeft(x_cord_now)

} else {

isLeft = false

moveToRight(x_cord_now)

}

private fun moveToLeft(current_x_cord: Int) {

val x = szWindow.x - current_x_cord

object : CountDownTimer(500, 5) {

var mParams = mFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams

override fun onTick(t: Long) {

val step = (500 - t) / 5

mParams.x = 0 - (current_x_cord * current_x_cord * step).toInt()

mWindowManager!!.updateViewLayout(mFloatingWidgetView, mParams)

}

override fun onFinish() {

mParams.x = 0

mWindowManager!!.updateViewLayout(mFloatingWidgetView, mParams)

}

}.start()

}

private fun moveToRight(current_x_cord: Int) {

object : CountDownTimer(500, 5) {

var mParams = mFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams

override fun onTick(t: Long) {

val step = (500 - t) / 5

mParams.x = (szWindow.x + current_x_cord * current_x_cord * step - mFloatingWidgetView!!.width).toInt()

mWindowManager!!.updateViewLayout(mFloatingWidgetView, mParams)

}

override fun onFinish() {

mParams.x = szWindow.x - mFloatingWidgetView!!.width

mWindowManager!!.updateViewLayout(mFloatingWidgetView, mParams)

}

}.start()

}

private fun bounceValue(step: Long, scale: Long): Double {

return scale * Math.exp(-0.055 * step) * Math.cos(0.08 * step)

}

private val isViewCollapsed: Boolean

private get() = mFloatingWidgetView == null || mFloatingWidgetView!!.findViewById<View>(R.id.image_collapsed).visibility == View.VISIBLE

private val statusBarHeight: Int

private get() = Math.ceil(25 * applicationContext.resources.displayMetrics.density.toDouble()).toInt()

override fun onConfigurationChanged(newConfig: Configuration) {

super.onConfigurationChanged(newConfig)

windowManagerDefaultDisplay

val layoutParams = mFloatingWidgetView!!.layoutParams as WindowManager.LayoutParams

if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {

if (layoutParams.y + (mFloatingWidgetView!!.height + statusBarHeight) > szWindow.y) {

layoutParams.y = szWindow.y - (mFloatingWidgetView!!.height + statusBarHeight)

mWindowManager!!.updateViewLayout(mFloatingWidgetView, layoutParams)

}

if (layoutParams.x != 0 && layoutParams.x < szWindow.x) {

resetPosition(szWindow.x)

}

} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {

if (layoutParams.x > szWindow.x) {

resetPosition(szWindow.x)

}

private fun onFloatingWidgetClick() {

if (isViewCollapsed) {

collapsedView!!.visibility = View.GONE

expandedView!!.visibility = View.VISIBLE

}

override fun onDestroy() {

super.onDestroy()

if (removeFloatingWidgetView != null) mWindowManager!!.removeView(removeFloatingWidgetView)

}

The MainActivity.kt classes

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    fun onClickFloatingButton(view: View?) {

        if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.M &amp;&amp; !Settings.canDrawOverlays(this)) {
            val intent = Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                    Uri.parse("package:$packageName"))
            startActivityForResult(intent, DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE)
        } else
            startFloatingWidgetService()
    }

    private fun startFloatingWidgetService() {
        startService(Intent(this@MainActivity, FloatingWidgetService::class.java))
        finish()
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (requestCode == DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE) {
            if (resultCode == Activity.RESULT_OK)
                startFloatingWidgetService() else
                Toast.makeText(this,
                        resources.getString(R.string.draw_other_app_permission_denied),
                        Toast.LENGTH_SHORT).show()
        } else {
            super.onActivityResult(requestCode, resultCode, data)
        }
    }

    companion object {
        private const val DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE = 1222
    }
}

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

}

fun onClickFloatingButton(view: View?) {

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !Settings.canDrawOverlays(this)) {

val intent = Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,

Uri.parse("package:$packageName"))

startActivityForResult(intent, DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE)

} else

startFloatingWidgetService()

}

private fun startFloatingWidgetService() {

startService(Intent(this@MainActivity, FloatingWidgetService::class.java))

finish()

}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {

if (requestCode == DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE) {

if (resultCode == Activity.RESULT_OK)

startFloatingWidgetService() else

Toast.makeText(this,

resources.getString(R.string.draw_other_app_permission_denied),

Toast.LENGTH_SHORT).show()

} else {

super.onActivityResult(requestCode, resultCode, data)

}

companion object {

private const val DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE = 1222

}

Finally, we implemented the code part of moving the floating button in this blog.

You can also check these links.

https://mobikul.com/how-to-add-extended-floating-action-button-in-android-app/

https://mobikul.com/display-floating-button-add-event-swift/

Another mentioned URL

Now we can also create any kind of Floating draggable button for our applications.

I hope this blog will help you to how to move the floating button all over the screen.

We can now run the app on how to create a draggable floating button.

Finally, We have implemented the draggable button feature.

Hope this blog helps you to create a Draggable floating button float all over the screen.

So, I hope it will help you out in understanding and get a brief idea about it.

You Can Also Check These links.

Another mentioned URL.

For more understanding please can go through this Link:

That’s all, You can enjoy your Floating Button implementation in Android.

Thank you very much.

android Floating button

Priyanka Kumari

30 Jan, 2024
Updated by - Priyanka Kumari
14 Apr, 2023
Updated by - Priyanka Kumari

. . .

Draggable Floating Button in Flutter.

It is a circular button that triggers the primary action in our app’s UI.

1.) Firstly we have to make the floating button and Service class.

Manifest:

activity_main.xml

floating_widget_layout.xml

remove_floating_layout.xml

2.) We can add the drawable resource layout below:

ic_baseline_access_alarm_24.xml

ic_close_black.xml

ic_close_white.xml

ic_open_view.xml

white_circle_shape.xml

3.) The Kotlin service classes :

The MainActivity.kt classes

Finally, we implemented the code part of moving the floating button in this blog.

You can also check these links.

Now we can also create any kind of Floating draggable button for our applications.

I hope this blog will help you to how to move the floating button all over the screen.

Finally, We have implemented the draggable button feature.

You Can Also Check These links.

Another mentioned URL.

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