使用Bitmap画一张自定义文字的图片

int w = 480,h = 800;
String title = "NNNNNNNNNNNNNNNN";
Bitmap bm = Bitmap.createBitmap(w,h, Config.ARGB_8888);
Canvas canvas = new Canvas(bm);
canvas.drawColor(Color.WHITE);
Paint p = new Paint();
p.setColor(Color.RED);
p.setTextSize(22);
canvas.drawText(title,w/2,h/2,p);

ImageView iv = (ImageView) findViewById(R.id.iv);
iv.setImageBitmap(bm);