Actividade que vai iniciar o serviço do botão com a runtime autorization

RunTimePermissons.java

    public final static int REQUEST_CODE = 1;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_initial);

        checkDrawOverlayPermission();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        *//** check if received result code
         is equal our requested code for draw permission  *//*
        if (requestCode == REQUEST_CODE) {

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                if (Settings.canDrawOverlays(this)) {
                    // continue here - permission was granted
                }
            }
        }
    }

    public void checkDrawOverlayPermission() {

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

                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                        Uri.parse("package:" + getPackageName()));

                startActivityForResult(intent, REQUEST_CODE);
            }
        }
    }
    
    
    
    //MANIFEST
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
        
    //SERVICE
import android.app.Service;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.Build;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.LinearInterpolator;
import android.widget.LinearLayout;
    
        
 public class FloatingButtonService extends Service {

    public static WindowManager wm;
    public static LinearLayout ll;

    public static ViewGroup mParentView; // for possible animate

    //private Button Stop;

    private int Original_mdpi_size_button = 80; //48

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        wm = (WindowManager) getSystemService(WINDOW_SERVICE);

        DisplayMetrics metrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(metrics);
        float screenDensityScale = metrics.scaledDensity;
        int height = (int) (metrics.heightPixels / screenDensityScale);
        int width = (int) (metrics.widthPixels / screenDensityScale);

        ll = new LinearLayout(this);
/*        Stop = new Button(this);
        WindowManager.LayoutParams btParametrs = new WindowManager.LayoutParams((int) (Original_mdpi_size_button * screenDensityScale),
                (int) (Original_mdpi_size_button * screenDensityScale),
                WindowManager.LayoutParams.TYPE_PHONE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT);
        Stop.setText("Fechar");
        Stop.setLayoutParams(btParametrs);*/


        LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
        // ll.setBackgroundColor(Color.argb(66, 255, 0, 0));
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            ll.setBackground(getResources().getDrawable(R.mipmap.ic_launcher, getTheme()));
        } else {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                ll.setBackground(getResources().getDrawable(R.mipmap.ic_launcher));
            }
        }

        ll.setLayoutParams(llp);

        WindowManager.LayoutParams parameters = new WindowManager.LayoutParams((int) (Original_mdpi_size_button * screenDensityScale),
                (int) (Original_mdpi_size_button * screenDensityScale),
                WindowManager.LayoutParams.TYPE_PHONE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                PixelFormat.TRANSLUCENT);


        parameters.gravity = Gravity.CENTER;
        parameters.y = 0;
        parameters.x = 0;

/*        final WindowManager.LayoutParams params_mParentView = new WindowManager.LayoutParams(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT,
               WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY  *//*| WindowManager.LayoutParams.TYPE_PHONE*//*,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN |
                        WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                PixelFormat.TRANSLUCENT);

        params_mParentView.gravity = Gravity.CENTER;
        params_mParentView.y = 0;
        params_mParentView.x = 0;

        mParentView = new FrameLayout(this);
        wm.addView(mParentView, params_mParentView);
        mParentView.addView(ll, parameters);*/

        //wm.addView(ll, params_mParentView);
        wm.addView(ll, parameters);

        ll.setVisibility(VISIBLE);

        // wm.addView(Stop, btParametrs);
        //wm.addView(ll, parameters);


/*        ll.setOnTouchListener(new View.OnTouchListener() {
            private WindowManager.LayoutParams updatedParameters = parameters;
            private int x, y;
            private float touchedX, touchedY;

            @Override
            public boolean onTouch(View view, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        x = updatedParameters.x;
                        y = updatedParameters.y;
                        touchedX = event.getRawX();
                        touchedY = event.getRawY();
                        break;
                    case MotionEvent.ACTION_MOVE:
                        updatedParameters.x = (int) (x + (event.getRawX() - touchedX));
                        updatedParameters.y = (int) (y + (event.getRawY() - touchedY));
                        wm.updateViewLayout(ll, updatedParameters);
                        break;
                    default:
                        break;
                }
                return false;
            }
        });*/




        ll.setOnLongClickListener(view -> {
            // mParentView.setOnClickListener(view -> {
            dialogIntent = new Intent(FloatingButtonService.this, TVActivity.class);
            dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP); // esta flag cria uma nova actividade sempre que esta é chamada
            startActivity(dialogIntent);
            return false;
        });


/*        Stop.setOnClickListener(view -> {
            wm.removeView(ll);
            wm.removeView(Stop);
            stopSelf();
        });*/


        //StartButtonAnimation();

    }

    public static Intent dialogIntent;

    private void StartButtonAnimation() {

        //      http://www.androidhive.info/2013/06/android-working-with-xml-animations/
        ll.setVisibility(VISIBLE);


        final Animation in = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.loop_translation);
        in.setRepeatCount(Animation.INFINITE);
        in.setRepeatMode(Animation.RESTART);

        in.setFillAfter(true);
        in.setInterpolator(new LinearInterpolator());
        //in.setInterpolator(new AccelerateInterpolator());
        //in.setInterpolator(new CycleInterpolator(2f));
        //in.setInterpolator((new AccelerateDecelerateInterpolator()));
        in.setDuration(16000);

        in.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {

            }

            @Override
            public void onAnimationEnd(Animation animation) {
                in.setInterpolator(new LinearInterpolator());
                ll.startAnimation(in);
            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }
        });

        ll.startAnimation(in);
    }
}