Android Service type floating action button with drag and drop functionality

问题

Anybody help me to make service type movable floating action button that displays on the screen of android device like button in Accessibility Scanner app https://play.google.com/store/apps/details?id=com.google.android.apps.accessibility.auditor&hl=en , i made button but want make it movable.

here is 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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <com.shamanland.fab.FloatingActionButton
        android:id="@+id/floatingActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:floatingActionButtonColor="#FFF"
        app:floatingActionButtonSize="normal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.32"
        android:src="@drawable/ic_accessibility_black_24dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Here is my service

package com.example.accessibilitysoftware;

import android.accessibilityservice.AccessibilityService;
import android.graphics.PixelFormat;
import android.os.Build;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.view.accessibility.AccessibilityEvent;
import android.widget.FrameLayout;
import android.widget.Toast;

import androidx.annotation.RequiresApi;

import com.shamanland.fab.FloatingActionButton;

public class Service extends AccessibilityService  {


    FrameLayout frameLayout;


    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP_MR1)
    @Override
    protected void onServiceConnected() {





        // Create an overlay and display the action bar
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        frameLayout = new FrameLayout(this);
        WindowManager.LayoutParams layoutParam = new WindowManager.LayoutParams();
        layoutParam.type = WindowManager.LayoutParams.TYPE_ACCESSIBILITY_OVERLAY;
        layoutParam.format = PixelFormat.TRANSLUCENT;
        layoutParam.flags |= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        layoutParam.width = WindowManager.LayoutParams.WRAP_CONTENT;

        layoutParam.height = WindowManager.LayoutParams.WRAP_CONTENT;
        layoutParam.gravity = Gravity.TOP;
        LayoutInflater inflater = LayoutInflater.from(this);
        inflater.inflate(R.layout.service, frameLayout);
        wm.addView(frameLayout, layoutParam);




        configureFloatingActionButton();
    }
    @Override
    public void onAccessibilityEvent(AccessibilityEvent event) {
    }
    @Override
    public void onInterrupt() {
    }
    private void configureFloatingActionButton(){
         final FloatingActionButton FLATButton = (FloatingActionButton) frameLayout.findViewById(R.id.floatingActionButton);
        FLATButton.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                    Toast.makeText(Service.this, "Clicked", Toast.LENGTH_SHORT).show();
                return false;
            }
        });
    }
}

Here is menifest

<application
       ...
        <service
            android:name=".Service"
            android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
            <intent-filter>
                <action android:name="android.accessibilityservice.AccessibilityService" />
            </intent-filter>

            <meta-data
                android:name="android.accessibilityservice"
                android:resource="@xml/app_service" />
        </service>
    </application>

And here is res\xml\app_service.xml file

<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
    android:accessibilityFeedbackType="feedbackGeneric"
    android:accessibilityFlags="flagDefault"
    android:accessibilityEventTypes="typeViewClicked|typeViewFocused"
    android:canPerformGestures="true"
    android:notificationTimeout="100"
    android:canRetrieveWindowContent="true" />

来源：https://stackoverflow.com/questions/61423600/android-service-type-floating-action-button-with-drag-and-drop-functionality