Android实现为图片添加水印

public class MainActivity extends AppCompatActivity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    ImageView iv = (ImageView) findViewById(R.id.imageView);    Drawable drawable = ContextCompat.getDrawable(this, R.drawable.image);    BitmapDrawable bd = (BitmapDrawable) drawable;    Bitmap bmp = bd.getBitmap();    Bitmap bitmap = createWatermark(bmp, "叶应是叶" + "http://blog.csdn.net/new_one_object");    iv.setImageBitmap(bitmap);  }  private Bitmap createWatermark(Bitmap bitmap, String mark) {    int w = bitmap.getWidth();    int h = bitmap.getHeight();    Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);    Canvas canvas = new Canvas(bmp);    Paint p = new Paint();    // 水印颜色    p.setColor(Color.parseColor("#c5576370"));    // 水印字体大小    p.setTextSize(150);    //抗锯齿    p.setAntiAlias(true);    //绘制图像    canvas.drawBitmap(bitmap, 0, 0, p);    //绘制文字    canvas.drawText(mark, 0, h / 2, p);    canvas.save(Canvas.ALL_SAVE_FLAG);    canvas.restore();    return bmp;  }}