自定义view 五角星 国旗

package com.example.yskj_jh.myapplication;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.View;

/**
* Created by YSKJ-JH on 2016/12/29.
*/

public class MyView extends View {
private Context context;
private Path path;
public MyView(Context context) {
super(context);
this.context =context;
}

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

int width=getWidth();
int r=width/2;

float outR=getWidth()/2 /5;
float inR=outR*sin(18)/sin(180-36-18);
Paint paint=new Paint();
paint.setAntiAlias(true);
paint.setStrokeWidth(5);
paint.setColor(Color.RED);
canvas.drawRect(30,30,700,500,paint);

paint.setColor(Color.YELLOW);

canvas.translate(r/5*2+15,200 );
canvas.rotate(-18);
path = getCompletePath(outR, inR);
paint.setStyle(Paint.Style.STROKE);
canvas.drawPath(path, paint);
paint.setStyle(Paint.Style.FILL);
canvas.drawPath(path, paint);

canvas.translate(r/5*2,-50);
canvas.rotate(-36);
path = getCompletePath(outR/3, inR/3);
paint.setStyle(Paint.Style.STROKE);
canvas.drawPath(path, paint);
paint.setStyle(Paint.Style.FILL);
canvas.drawPath(path, paint);

canvas.translate(0,80);
canvas.rotate(-18);
path = getCompletePath(outR/3, inR/3);
paint.setStyle(Paint.Style.STROKE);
canvas.drawPath(path, paint);
paint.setStyle(Paint.Style.FILL);
canvas.drawPath(path, paint);

canvas.translate(-70,10);
canvas.rotate(54);
path = getCompletePath(outR/3, inR/3);
paint.setStyle(Paint.Style.STROKE);
canvas.drawPath(path, paint);
paint.setStyle(Paint.Style.FILL);
canvas.drawPath(path, paint);

canvas.translate(-70,50);
canvas.rotate(-18);
path = getCompletePath(outR/3, inR/3);
paint.setStyle(Paint.Style.STROKE);
canvas.drawPath(path, paint);
paint.setStyle(Paint.Style.FILL);
canvas.drawPath(path, paint);
}

private Path getCompletePath(float outR, float inR) {
Path path=new Path();

path.moveTo(outR*cos(72*0), outR*sin(72*0));

path.moveTo(outR*cos(72*0), outR*sin(72*0));
path.lineTo(inR*cos(72*0+36), inR*sin(72*0+36));
path.lineTo(outR*cos(72*1), outR*sin(72*1));
path.lineTo(inR*cos(72*1+36), inR*sin(72*1+36));
path.lineTo(outR*cos(72*2), outR*sin(72*2));
path.lineTo(inR*cos(72*2+36), inR*sin(72*2+36));
path.lineTo(outR*cos(72*3), outR*sin(72*3));
path.lineTo(inR*cos(72*3+36), inR*sin(72*3+36));
path.lineTo(outR*cos(72*4), outR*sin(72*4));
path.lineTo(inR*cos(72*4+36), inR*sin(72*4+36));
path.close();
return path;
}
float cos(int num){
return (float) Math.cos(num*Math.PI/180);
}

float sin(int num){
return (float) Math.sin(num*Math.PI/180);
}
}

private FrameLayout frameLayout;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_draw_view);
frameLayout = (FrameLayout) findViewById(R.id.fragment);
frameLayout.addView(new MyView(DrawViewActivity.this));
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<FrameLayout
android:id="@+id/fragment"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>