Android Service implementation with fullscreen overlay window (over status bar & navigation bar)

FullscreenOverlayService.java

class FullscreenOverlayService extends Service {

    private View overlay;
    private WindowManager windowManager;

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        super.onStartCommand(intent, flags, startId);

        overlay = View.inflate(getApplicationContext(), R.layout.overlay_service, null);
        overlay.findViewById(R.id.button_stop).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                stopSelf();
            }
        });

        WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
                        WindowManager.LayoutParams.FLAG_FULLSCREEN |
                        WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN |
                        WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS |
                        WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR |
                        WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
                PixelFormat.TRANSLUCENT
        );
        layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
        windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        windowManager.addView(overlay, layoutParams);

        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        windowManager.removeView(overlay);
    }
}


class FullscreenOverlayLayout extends FrameLayout {

    // コンストラクタ...

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        WindowManager windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
        Point screenSize = new Point();
        windowManager.getDefaultDisplay().getRealSize(screenSize);

        super.onMeasure(
                MeasureSpec.makeMeasureSpec(screenSize.x, MeasureSpec.getMode(widthMeasureSpec)),
                MeasureSpec.makeMeasureSpec(screenSize.y, MeasureSpec.getMode(heightMeasureSpec))
        );
    }
}

class OverlayDrawingView extends View {

    // コンストラクタ...

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // カスタム描画処理...
    }
}

FullscreenOverlayService.kt

class FullscreenOverlayService : Service() {

    private val overlay by lazy {
        View.inflate(applicationContext, R.layout.overlay_service, null).also {
            it.button_stop.setOnClickListener {
                stopSelf()
            }
        }
    }

    private val windowManager by lazy {
        applicationContext.getSystemService(Context.WINDOW_SERVICE) as WindowManager
    }

    override fun onBind(intent: Intent?): IBinder? {
        return null
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        super.onStartCommand(intent, flags, startId)

        val layoutParams = WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE or
                        WindowManager.LayoutParams.FLAG_FULLSCREEN or
                        WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN or
                        WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS or
                        WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR or
                        WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
                PixelFormat.TRANSLUCENT
        ).also {
            it.gravity = Gravity.LEFT or Gravity.TOP
        }
        windowManager.addView(overlay, layoutParams)

        return START_STICKY
    }

    override fun onDestroy() {
        super.onDestroy()
        windowManager.removeView(overlay)
    }
}

class FullscreenOverlayLayout @JvmOverloads constructor(
        context: Context,
        attrs: AttributeSet? = null,
        defStyleAttr: Int = 0
) : FrameLayout(context, attrs, defStyleAttr) {

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        val windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
        val screenSize = Point().also { windowManager.defaultDisplay.getRealSize(it) }

        super.onMeasure(
                MeasureSpec.makeMeasureSpec(screenSize.x, MeasureSpec.getMode(widthMeasureSpec)),
                MeasureSpec.makeMeasureSpec(screenSize.y, MeasureSpec.getMode(heightMeasureSpec))
        )
    }
}

class OverlayDrawingView @JvmOverloads constructor(
        context: Context,
        attrs: AttributeSet? = null,
        defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {

    private val paint by lazy {
        Paint().apply {
            color = Color.LTGRAY
            style = Paint.Style.STROKE
            strokeWidth = 8f
        }
    }

    override fun onDraw(canvas: Canvas?) {
        super.onDraw(canvas)

        if (canvas != null && canvas.width > 0) {
            val W = canvas.width
            val H = canvas.height
            val interval = W / STEP

            // 斜めパターンの描画
            generateSequence(0f) { it + interval }
                    .take(STEP + H / interval + 1)
                    .forEach { canvas.drawLine(it, 0f, 0f, it, paint) }

            canvas.drawRect(0f, 0f, W.toFloat(), H.toFloat(), paint)
        }
    }

    companion object {
        private const val STEP = 9
    }
}

overlay_service.xml

<?xml version="1.0" encoding="utf-8"?>
<com.labo.kaji.playground.FullscreenOverlayLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <com.labo.kaji.playground.OverlayDrawingView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_gravity="center"
        >

        <TextView
            android:id="@+id/text_hello"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello Overlay!"
            android:textSize="16sp"
            android:textColor="#FFF"
            />

        <Button
            android:id="@+id/button_stop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:text="Stop"
            />

    </LinearLayout>

</com.labo.kaji.playground.FullscreenOverlayLayout>

the window is on navigationbar area can not click?

Thank you. You code thanked me a lot. I have been searching for this code for last 4 days and i was at the edge of giving hope. Thank you so much

Thank you very, very, very much

bro it works out! but does not covers the top notification area only covers the bottom navigation area☹️. Any idea to make it complete full screen?