给图片添加水印的基本思路都是载入原图，添加文字或者载入水印图片，保存图片这三个部分
添加水印图片：
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private Bitmap createWaterMaskImage(Context gContext, Bitmap src, Bitmap watermark)
{
String tag = "createBitmap";
Log.d(tag, "create a new bitmap");
if (src == null)
{
return null;
}
int w = src.getWidth();
int h = src.getHeight();
int ww = watermark.getWidth();
int wh = watermark.getHeight();
// create the new blank bitmap
Bitmap newb = Bitmap.createBitmap(w, h, Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
Canvas cv = new Canvas(newb);
// draw src into
cv.drawBitmap(src, 0, 0, null);// 在 0，0坐标开始画入src
// draw watermark into
cv.drawBitmap(watermark, 20, 20, null);// 在src的右下角画入水印
// save all clip
cv.save(Canvas.ALL_SAVE_FLAG);// 保存
// store
cv.restore();// 存储
return newb;
}
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添加文字
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public static Bitmap scaleWithWH(Bitmap src, double w, double h) {
if (w == 0 || h == 0 || src == null) {
return src;
} else {
// 记录src的宽高
int width = src.getWidth();
int height = src.getHeight();
// 创建一个matrix容器
Matrix matrix = new Matrix();
// 计算缩放比例
float scaleWidth = (float) (w / width);
float scaleHeight = (float) (h / height);
// 开始缩放
matrix.postScale(scaleWidth, scaleHeight);
// 创建缩放后的图片
return Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);
}
}
public Bitmap drawTextToBitmap(Context gContext,
int gResId,
String gText) {
Resources resources = gContext.getResources();
float scale = resources.getDisplayMetrics().density;
Bitmap bitmap =
BitmapFactory.decodeResource(resources, gResId);
bitmap = scaleWithWH(bitmap, 300*scale, 300*scale);
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.RED);
paint.setTextSize((int) (18 * scale));
paint.setDither(true); //获取跟清晰的图像采样
paint.setFilterBitmap(true);//过滤一些
Rect bounds = new Rect();
paint.getTextBounds(gText, 0, gText.length(), bounds);
int x = 30;
int y = 30;
canvas.drawText(gText, x * scale, y * scale, paint);
return bitmap;
}
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