Android為圖片添加水印文字

    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);  

        //為簡單期間，就使用Android原生的小機器人為目標圖片  
        Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);  

        // Drawable -> Bitmap：Drawable 轉換成 Bitmap。  
        BitmapDrawable bd = (BitmapDrawable) drawable;  
        Bitmap bmp = bd.getBitmap();  

        // 為Bitmap添加水印  
        Bitmap bitmap = createWatermark(bmp, "@ Zhang Phil");  

        iv.setImageBitmap(bitmap);  
    }  

    // 為圖片target添加水印文字  
    // Bitmap target：被添加水印的圖片  
    // 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();  

        // 水印的顏色  
        p.setColor(Color.RED);  

        // 水印的字體大小  
        p.setTextSize(10);  

        p.setAntiAlias(true);// 去鋸齒  

        canvas.drawBitmap(target, 0, 0, p);  

        // 在左邊的中間位置開始添加水印  
        canvas.drawText(mark, 0, h / 2, p);  

        canvas.save(Canvas.ALL_SAVE_FLAG);  
        canvas.restore();  

        return bmp;  
    }  
}  </pre>