邮票View;参考自 https://github.com/dongjunkun/CouponView/blob/master/library/src/main/java/yyydjk/com/library/CouponViewHelper.java

build.gradle

compile 'com.jakewharton:butterknife:7.0.1'

compile 'com.github.bumptech.glide:glide:3.7.0'

MainActivity.java

package test.test_couponview;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;

import com.bumptech.glide.Glide;

import butterknife.Bind;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {

    @Bind(R.id.coupon_view)
    CouponView coupon_view;

    @Bind(R.id.imgv1)
    ImageView imgv1;
    @Bind(R.id.imgv2)
    ImageView imgv2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        String url="http://a4.topitme.com/l110/10110982420e61a2ab.jpg";
        Glide.with(this)
                .load(url).centerCrop().into(imgv1);
        Glide.with(this)
                .load(url).centerCrop().into(imgv2);

    }
}

MyView.java

package test.test_couponview;

import android.content.Context;
import android.graphics.Bitmap;
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;

/**
 * Created by Administrator on 2016/10/4.
 */

public class MyView extends View {
    public MyView(Context context) {
        super(context);
        init();
    }

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }
    Paint circlePaint;
    public void init(){

        circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        circlePaint.setDither(true);
        circlePaint.setColor(Color.TRANSPARENT);
        circlePaint.setStyle(Paint.Style.FILL);
        circlePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

        bgColor = Color.parseColor("#ffffff");

    }
    Bitmap mBitmap;
    Canvas mCanvas;
    int viewWidth;
    int viewHeight;

    int bgColor;
    int semicircleGap=24;
    int semicircleRadius=12;
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        this.viewWidth=w;
        this.viewHeight=h;

        caculate();

    }

    int semicircleNumX;
    int semicircleNumY;
    int remindSemicircleX;
    int remindSemicircleY;
    private void caculate() {
        if (mBitmap!=null){
            mBitmap.recycle();
            mBitmap=null;
        }

        mBitmap = Bitmap.createBitmap(viewWidth, viewHeight, Bitmap.Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);

        remindSemicircleX = (int) ((viewWidth - semicircleGap) % (2 * semicircleRadius + semicircleGap));
        semicircleNumX = (int) ((viewWidth - semicircleGap) / (2 * semicircleRadius + semicircleGap));

        remindSemicircleY = (int) ((viewHeight - semicircleGap) % (2 * semicircleRadius + semicircleGap));
        semicircleNumY = (int) ((viewHeight - semicircleGap) / (2 * semicircleRadius + semicircleGap));
    }


    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        mCanvas.drawColor(bgColor);

        for (int i = 0; i < semicircleNumX; i++) {
            float x = semicircleGap + semicircleRadius + remindSemicircleX / 2 + (semicircleGap + semicircleRadius * 2) * i;
            mCanvas.drawCircle(x, 0, semicircleRadius, circlePaint);
        }
        for (int i = 0; i < semicircleNumX; i++) {
            float x = semicircleGap + semicircleRadius + remindSemicircleX / 2 + (semicircleGap + semicircleRadius * 2) * i;
            mCanvas.drawCircle(x, viewHeight, semicircleRadius, circlePaint);
        }

        for (int i = 0; i < semicircleNumY; i++) {
            float y = semicircleGap + semicircleRadius + remindSemicircleY / 2 + (semicircleGap + semicircleRadius * 2) * i;
            mCanvas.drawCircle(0, y, semicircleRadius, circlePaint);
        }
        for (int i = 0; i < semicircleNumY; i++) {
            float y = semicircleGap + semicircleRadius + remindSemicircleY / 2 + (semicircleGap + semicircleRadius * 2) * i;
            mCanvas.drawCircle(viewWidth, y, semicircleRadius, circlePaint);
        }

        canvas.drawBitmap(mBitmap, 0, 0, null);

    }
}