在bitmap上打印文字（居中）

Utils.java

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;

public class Utils {

    public static Bitmap drawTextToBitmap(String text) {
        Bitmap bitmap = Bitmap.createBitmap(360, 130, Bitmap.Config.ARGB_4444);

        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.BLACK);
        paint.setTextSize(120);
        paint.setFakeBoldText(true);

        Rect bounds = new Rect();
        paint.getTextBounds(text, 0, text.length(), bounds);

        int x1 = (bitmap.getWidth() - bounds.width()) / 2;
        int y1 = (bitmap.getHeight() + bounds.height()) / 2;

        canvas.drawText(text, x1, y1, paint);

        //上面代码已完成在bitmap上打印文字（居中），下面是把bitmap转成黑白图
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        int[] pixels = new int[width * height];
        bitmap.getPixels(pixels, 0, width, 0, 0, width, height);    //取得BITMAP的所有像素点

        for (int y = 0; y < height; y++) {
            int offset = y * width;
            for (int x = 0; x < width; x++) {
                pixels[offset + x] = pixels[offset + x] != 0 ? 0xFF000000 : 0xFFFFFFFF;
            }
        }

        bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);

        return bitmap;
    }
}