package com.loaderman.customviewdemo;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.os.Bundle;

import android.widget.ImageView;

public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.dog);

        Bitmap watermark = BitmapFactory.decodeResource(getResources(), R.drawable.watermark);

        Bitmap result = createBitmap(bitmap, watermark);

        ImageView imageView = (ImageView) findViewById(R.id.img);

        imageView.setImageBitmap(result);

    }

    private Bitmap createBitmap(Bitmap src, Bitmap watermark) {

        if (src == null) {

            return null;

        }

        int w = src.getWidth();

        int h = src.getHeight();

        int ww = watermark.getWidth();

        int wh = watermark.getHeight();

        //创建空白图像

        Bitmap newb = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);//创建一个新的和SRC长度宽度一样的位图

        Canvas cv = new Canvas(newb);

        //画原图

        cv.drawBitmap(src, 0, 0, null);//在 0，0坐标开始画入src

        //在src的右下角画入水印

        cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);

        return newb;

    }

}