Android为图片添加水印文字详解手机开发

    import android.os.Bundle;   
    import android.widget.ImageView;   
    import android.app.Activity;   
    import android.graphics.Bitmap;   
    import android.graphics.Canvas;   
    import android.graphics.Color;   
    import android.graphics.Paint;   
    import android.graphics.drawable.BitmapDrawable;   
    import android.graphics.drawable.Drawable;   
       
    public class MainActivity extends Activity {   
       
        @Override   
        protected void onCreate(Bundle savedInstanceState) {   
            super.onCreate(savedInstanceState);   
            setContentView(R.layout.activity_main);   
       
            ImageView iv = (ImageView) findViewById(R.id.imageView);   
       
            //为简单期间，就使用Android原生的小机器人为目标图片   
            Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);   
       
            // Drawable -> Bitmap：Drawable 转换成 Bitmap。   
            BitmapDrawable bd = (BitmapDrawable) drawable;   
            Bitmap bmp = bd.getBitmap();   
       
            // 为Bitmap添加水印   
            Bitmap bitmap = createWatermark(bmp, "@ Zhang Phil");   
       
            iv.setImageBitmap(bitmap);   
        }   
       
        // 为图片target添加水印文字   
        // Bitmap target：被添加水印的图片   
        // String mark：水印文章   
        private Bitmap createWatermark(Bitmap target, String mark) {   
            int w = target.getWidth();   
            int h = target.getHeight();   
       
            Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);   
            Canvas canvas = new Canvas(bmp);   
       
            Paint p = new Paint();   
       
            // 水印的颜色   
            p.setColor(Color.RED);   
       
            // 水印的字体大小   
            p.setTextSize(10);   
       
            p.setAntiAlias(true);// 去锯齿   
       
            canvas.drawBitmap(target, 0, 0, p);   
       
            // 在左边的中间位置开始添加水印   
            canvas.drawText(mark, 0, h / 2, p);   
       
            canvas.save(Canvas.ALL_SAVE_FLAG);   
            canvas.restore();   
       
            return bmp;   
        }   
    }