Android为图片添加水印文字

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 {@Overrideprotected 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;}}
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