原图：
效果图：
参考代码如下：
public class MainActivity extends Activity { private Button btn_start; private ImageView img; private Bitmap bitmap; private Bitmap wbitmap; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.image_layout); initView(); } private void initView() { img = (ImageView) findViewById(R.id.iv_image); bitmap = ((BitmapDrawable) img.getDrawable()).getBitmap(); wbitmap=((BitmapDrawable)getResources().getDrawable(R.drawable.img_label_user)).getBitmap(); btn_start = (Button) findViewById(R.id.btn_start); btn_start.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Bitmap bm = ImageTools.Watermark(bitmap,wbitmap,100); img.setImageBitmap(bm); } }); }}ImageTools工具类：
/** * 水印 * @param src 添加水印的图 * @param watermark 水印图 * @param alpha 水印的透明度 * @return */ public static Bitmap Watermark(Bitmap src, Bitmap watermark,int alpha) { if (src == null) { return null; } int w = src.getWidth(); int h = src.getHeight(); int ww = watermark.getWidth(); int wh = watermark.getHeight(); Paint paint=new Paint(); paint.setAlpha(alpha); paint.setAntiAlias(true); Bitmap newb = Bitmap.createBitmap(w, h, Config.ARGB_8888); Canvas cv = new Canvas(newb); cv.drawBitmap(src, 0, 0, null); cv.drawBitmap(watermark, 0, h/2, paint); cv.save(Canvas.ALL_SAVE_FLAG); cv.restore(); return newb; }转载请注明出处：http://blog.csdn.net/hai_qing_xu_kong/article/details/45220425 情绪控_