Android-在画布上绘制带有纯色背景的文本,用作位图

我已经构建了一个应用程序,它用一个图板将文本绘制到画布上,然后将其用作位图并放入谷歌地图标记中。
我现在想做的是删除文本边框,并在文本后面创建一个实心的黑色矩形背景。我尝试了一些方法,但屏幕上似乎没有任何效果。

迄今为止的代码:

    String text = "testText";        

    //create bitmap
    Bitmap.Config conf = Bitmap.Config.ARGB_8888; 
    Bitmap bmp = Bitmap.createBitmap(300, 100, conf); 

    //--style text
    //text font
    Typeface tf = Typeface.create("Helvetica", Typeface.BOLD);
    //--set text style, colour, alignment, size
    //text
    Paint mText = new Paint();
    mText.setTextAlign(Align.CENTER);
    mText.setColor(Color.WHITE);
    mText.setStyle(Paint.Style.FILL);
    mText.setTextSize(convertToPixels(context, 12));
    mText.setTypeface(tf);
    mText.setAntiAlias(true);

    //text outline
    Paint mTextOutline = new Paint();
    mTextOutline.setTextAlign(Align.CENTER);
    mTextOutline.setColor(Color.BLACK);
    mTextOutline.setStyle(Paint.Style.STROKE);
    mTextOutline.setTextSize(convertToPixels(context, 12));
    mTextOutline.setTypeface(tf);
    mTextOutline.setAntiAlias(true);
    mTextOutline.setStrokeWidth(2);

    //create and draw text and outline onto canvas
    Canvas canvas = new Canvas(bmp);
    canvas.drawText(text, 150, 50, mText);
    canvas.drawText(text, 150, 50, mTextOutline);

    //add text marker to map
    textMarker[markerID] = mapView.addMarker(new MarkerOptions()
        .title("TEXT_MARKER")
        .position(point)
        .icon(BitmapDescriptorFactory.fromBitmap(bmp)));

更新:

我现在正在尝试的。似乎只会在文本下方返回一条细黑线。

//create bitmap
        Bitmap.Config conf = Bitmap.Config.ARGB_8888; 
        Bitmap bmp = Bitmap.createBitmap(300, 100, conf); 

        //--style text
        //text font
        Typeface tf = Typeface.create("Helvetica", Typeface.BOLD);
        //--set text style, colour, alignment, size
        //text
        Paint mText = new Paint();
        mText.setTextAlign(Align.CENTER);
        mText.setColor(Color.WHITE);
        mText.setStyle(Paint.Style.FILL);
        mText.setTextSize(convertToPixels(context, 12));
        mText.setTypeface(tf);
        mText.setAntiAlias(true);

        //text outline
        Paint mTextBackground = new Paint();
        mTextBackground.setColor(Color.BLACK);
        mTextBackground.setStyle(Style.FILL);

        Rect rectangle = new Rect();

        mText.getTextBounds(text, 0, text.length(), rectangle);

        //create and draw text and outline onto canvas
        Canvas canvas = new Canvas(bmp);
        canvas.drawRect(rectangle, mTextBackground);
        canvas.drawText(text, 150, 50, mText);


        //add text marker to map
        textMarker[markerID] = mapView.addMarker(new MarkerOptions()
            .title("TEXT_MARKER")
            .position(point)
            .icon(BitmapDescriptorFactory.fromBitmap(bmp)));