package com.example.administrator.test.Five.Second;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.util.AttributeSet;
import android.view.View;

import com.example.administrator.test.R;

/**
 * Created by Administrator on 2017/7/21.
 */

public class AnomalousPhotoView extends View {

    private Bitmap bmpCat;
    private Bitmap bmpMask;
    private Bitmap bmpresult;
    Canvas c_bmpcat;
    Canvas c_bmpmask;
    Canvas c_result;
    private Paint paint;
    private static final int OFFSET=10;

    public AnomalousPhotoView(Context context, AttributeSet attrs){

        super(context,attrs);
        bmpCat= BitmapFactory.decodeResource(context.getResources(), R.drawable.luoluo);
        bmpMask= Bitmap.createBitmap(bmpCat.getWidth(),bmpCat.getHeight(), Bitmap.Config.ARGB_8888);
        c_bmpmask=new Canvas(bmpMask);
        paint=new Paint(Paint.ANTI_ALIAS_FLAG);
    }


    @Override
    protected void onDraw(Canvas canvas){

        super.onDraw(canvas);
        int id=canvas.saveLayer(0,0,bmpCat.getWidth(),bmpCat.getHeight(),null,Canvas.ALL_SAVE_FLAG);
        canvas.drawBitmap(bmpCat,0,0,null);
        paint.setColor(Color.BLUE);
        c_bmpmask.drawCircle(bmpCat.getWidth()/2,bmpCat.getHeight()/2,200,paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
        //canvas.drawCircle(100,100,100,paint);
        canvas.drawBitmap(bmpMask,0,0,paint);
        canvas.restoreToCount(id);
    }




}

Android的简易圆形头像