位图上的中心文本

Question

我正在尝试在位图的中心绘制文本,但即使我使用align.center,我也无法做到.代码是:

public Bitmap drawTextToBitmap(Context gContext, String gText) {
    Resources resources = gContext.getResources();
    float scale = resources.getDisplayMetrics().density;
    Bitmap bitmap = 
            BitmapFactory.decodeResource(resources, R.drawable.blank_marker);

    android.graphics.Bitmap.Config bitmapConfig =
            bitmap.getConfig();
    // set default bitmap config if none
    if(bitmapConfig == null) {
        bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
    }
    // resource bitmaps are imutable, 
    // so we need to convert it to mutable one
    bitmap = bitmap.copy(bitmapConfig, true);

    Canvas canvas = new Canvas(bitmap);
    // new antialised Paint
    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    // text color - #3D3D3D
    paint.setColor(Color.rgb(61, 61, 61));
    // text size in pixels
    paint.setTextSize((int) (25 * scale));
    // text shadow
    paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);

    // draw text to the Canvas center
    Rect bounds = new Rect();
    paint.setTextAlign(Align.CENTER);

    paint.getTextBounds(gText, 0, gText.length(), bounds);
    int x = (bitmap.getWidth() - bounds.width())/2;
    int y = (bitmap.getHeight() + bounds.height())/2; 

    canvas.drawText(gText, x * scale, y * scale, paint);

    return bitmap;
}

我究竟做错了什么？

Answer 1

它比你想象的要简单得多.

在文本Bitmap的宽度和高度(中心点)的一半处绘制文本Paint.setTextAlign(Align.CENTER).

对齐属性将处理其余部分.