Android为图片添加水印文字

た入场券 2023-10-16 21:11 26阅读 0赞

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;
    	}
    }