在android中从右和底截断的自定义视图圈

Question

我正在使用自定义视图或画布创建一个圆圈。圆圈也是用边框创建的，但问题是圆圈的右下角会被截断。我通过下面提到的代码获得以下输出，

我创建上述类的自定义视图类如下，

package cl.tk.ui.iBAPView;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.v4.content.ContextCompat;
import android.util.AttributeSet;
import android.view.View;

import cl.tkp.R;

public class RoundedView extends View {

private Paint paint,mPaintBorder;
private int color;
float borderWidth;
private String text = null;
private boolean checked = false;
private Drawable drawable;

public RoundedView(Context context) {
    super(context);
    bootstrap(context, null,0,0);
}

public RoundedView(Context context, AttributeSet attrs) {
    super(context, attrs);
    bootstrap(context, attrs, 0,0);
}

public RoundedView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    bootstrap(context, attrs, defStyleAttr, 0);
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public RoundedView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    bootstrap(context, attrs, defStyleAttr, defStyleRes);
}

private void bootstrap(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundedView, defStyleAttr, defStyleRes);
    text = a.getString(R.styleable.RoundedView_android_text);
    color = a.getColor(R.styleable.RoundedView_bgColor, Color.GRAY);
    drawable=a.getDrawable(R.styleable.RoundedView_drawableCenter);
    checked=a.getBoolean(R.styleable.RoundedView_checked,false);
    borderWidth= a.getDimension(R.styleable.RoundedView_rborderWidth,context.getResources().getDimension(R.dimen._minus2sdp));

    paint = new Paint(Paint.DITHER_FLAG);

    mPaintBorder = new Paint(Paint.ANTI_ALIAS_FLAG);
    mPaintBorder.setColor(a.getColor(R.styleable.RoundedView_borderColor,ContextCompat.getColor(context,android.R.color.transparent)));
    a.recycle();
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {

}

@Override
protected void onDraw(Canvas canvas) {
    //if (getBackgroundColor(this) != 0) color = getBackgroundColor(this);
    paint.setAntiAlias(true);
    paint.setFilterBitmap(true);
    paint.setDither(true);
    canvas.drawARGB(0, 0, 0, 0);

    paint.setColor(color);

    if(borderWidth>0)
    {
        float radius=(getWidth()-borderWidth-2)/2;
        canvas.drawCircle(radius + borderWidth,radius + borderWidth,radius + borderWidth, mPaintBorder);
        canvas.drawCircle(radius + borderWidth,radius + borderWidth,radius ,paint);
    }else {
        float radius=getWidth()/2;
        canvas.drawCircle(radius, radius, radius, paint);
    }
}

}

这是我在xml中调用它的方式，

  <cl.tk.ui.iBAPView.RoundedView
            android:id="@+id/signup_user_rv1"
            android:layout_marginRight="@dimen/_3sdp"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_width="@dimen/_18sdp"
            android:layout_height="@dimen/_18sdp"
            app:rborderWidth="@dimen/_2sdp"
            app:borderColor="@color/colorBlue"/>