如何使用View自定义属性画圆

//主方法package com.example.tianjiale20160808;import view.LegePaint;import android.os.Bundle;import android.app.Activity;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private EditText ed2;private EditText ed3;private EditText ed4;private Button but5;private LegePaint mlege;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);findid();}private void findid() {ed2 = (EditText) findViewById(R.id.ed2);ed3 = (EditText) findViewById(R.id.ed3);ed4 = (EditText) findViewById(R.id.ed4);but5 = (Button) findViewById(R.id.but5);mlege = (LegePaint) findViewById(R.id.mlegeView);Log.i("lege", "aaaaaaaaaaaaaaaaaaaaaaaa");but5.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String trim1 = ed2.getText().toString().trim();String trim2 = ed3.getText().toString().trim();String trim3 = ed4.getText().toString().trim();if (trim1.length() >= 1 && trim1.length() >= 1&& trim1.length() >= 1) {//强转String型为Float型       参数不能为空float price1 = Float.parseFloat(trim1);float price2 = Float.parseFloat(trim2);Log.i("lege", price1 + "");Log.i("lege", price2 + "");Log.i("lege", trim3);//通过有参构造 赋值mlege.setP1(price1);mlege.setP2(price2);mlege.setTrim(trim3);//从新绘制mlege.invalidate();} else {Toast.makeText(MainActivity.this, "最后一个参数格式是   #FF0000", 0).show();}}});}}//集成view类package view;import com.example.tianjiale20160808.MainActivity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.util.Log;import android.view.View;public class LegePaint extends View {    private Context context;    private float p1=10;    private float p2=5;    private String trim="#ffffff";    private Paint mpaint;        public float getP1() {        return p1;    }    public void setP1(float p1) {        this.p1 = p1;    }    public float getP2() {        return p2;    }    public void setP2(float p2) {        this.p2 = p2;    }    public String getTrim() {        return trim;    }    public void setTrim(String trim) {        this.trim = trim;    }    public LegePaint(Context context) {        this(context,null);    }    public LegePaint(Context context, AttributeSet attrs) {        this(context, attrs,0);    }    public LegePaint(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        mpaint =new Paint(Paint.ANTI_ALIAS_FLAG);        mpaint.setStyle(Paint.Style.STROKE);            }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        mpaint.setStrokeWidth(p2);        mpaint.setColor(Color.parseColor(trim));        Log.i("le", p1+"aaaaaaaaaaaaa"+p2+"trim");        canvas.drawCircle(300, 300, p1, mpaint);    }    public void shuxin(){        invalidate();    }}//布局文件<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <LinearLayout         android:id="@+id/bu1"        android:layout_width="match_parent"        android:layout_height="50dp"        android:background="#00FF00">        <TextView        android:id="@+id/title1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="自定义圆环"         android:layout_marginLeft="120dp"        android:layout_marginTop="20dp"        />    </LinearLayout>    <LinearLayout         android:id="@+id/bu2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="10dp"       >        <TextView        android:id="@+id/title2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="圆的半径"         />        <EditText             android:id="@+id/ed2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:ems="9"/>    </LinearLayout>    <LinearLayout         android:id="@+id/bu3"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="10dp"       >        <TextView        android:id="@+id/title3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="圆环的宽度"         />        <EditText             android:id="@+id/ed3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:ems="9"/>    </LinearLayout>    <LinearLayout         android:id="@+id/bu4"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="10dp"       >        <TextView        android:id="@+id/title4"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="圆环的颜色"         />        <EditText             android:id="@+id/ed4"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:ems="9"/>    </LinearLayout>    <Button         android:id="@+id/but5"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="绘图"/>    <view.LegePaint        android:id="@+id/mlegeView"        android:layout_width="match_parent"        android:layout_height="match_parent"        /></LinearLayout>