自定義圓形textview

package com.xxx.widgets;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

import com.sito.ioammcpv2.R;

/**
 * Created by Yangzb on 2018/6/14 10:39
 * E-mail：[email protected]
 * Decsribe:
 */
public class CustomCircleView extends View {

    private static final String TAG = CustomCircleView.class.getSimpleName();
    /**
     * 文本
     */
    private String titleText ;
    /**
     * 字型顔色
     */
    private int titleColor = Color.BLACK ;
    /**
     * 背景顔色,設定預設顔色
     */
    private int backColor = Color.GRAY;

    /**
     * 色值
     */
    private int titleSize ;

    /**
     *控制文本的範圍
     */
    private Rect mBound;
    private Paint mPaint;

    public CustomCircleView(Context context) {
        this(context, null);
    }

    public CustomCircleView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);

    }

    public CustomCircleView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        TypedArray a= context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomCircleView,defStyleAttr,0);
        /**
         * 這個獲得是你實際在layout中設定的屬性個數
         */
        int n = a.getIndexCount();
        for(int i = 0;i<n;i++)
        {
            int attr = a.getIndex(i);
            switch (attr)
            {
                case R.styleable.CustomCircleView_titleText:
                    titleText = a.getString(attr);
                    break;
                case R.styleable.CustomCircleView_titleTextColor:
                    titleColor = a.getColor(attr, Color.BLACK);
                    break;
                case R.styleable.CustomCircleView_backColor:
                    backColor = a.getColor(attr,Color.GREEN);
                    break;
                case R.styleable.CustomCircleView_titleTextSize:
                    titleSize = a.getDimensionPixelSize(attr,(int) TypedValue.applyDimension(
                            TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
                    break;
            }
        }
        a.recycle();
        mPaint = new Paint();
        mPaint.setTextSize(titleSize);
        mBound = new Rect();
        /**
         * 獲得繪制文本的寬和高
         */
        mPaint.getTextBounds(titleText, 0, titleText.length(), mBound);


    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //Log.e(TAG,"onDraw");
        //圓的半徑
        int r = Math.min(getMeasuredWidth() / 2,getMeasuredHeight()/2);
        //圓心的橫坐标
        int centerX =r;
        //圓心的縱坐标
        int centerY =r;
        Paint paint = new Paint();
        paint.setColor(Color.GREEN);
        mPaint.setColor(backColor);
        //繪制圓
        canvas.drawCircle(centerX, centerY, r, mPaint);
        mPaint.setColor(titleColor);
        //繪制Text 解決文字布局中 向左偏移4dp
        canvas.drawText(titleText, getWidth() / 2 - mBound.width() / 2-4, getHeight() / 2 + mBound.height() / 2, mPaint);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //Log.e(TAG,"onMeasure");
        int width = getMySize(100,widthMeasureSpec);
        int height = getMySize(100,heightMeasureSpec);
        setMeasuredDimension(width, height);
    }

    /**
     * 計算相應的寬高
     * @param defaultSize 預設值
     * @param measureSpec
     * @return
     */
    private int getMySize(int defaultSize, int measureSpec) {
        int mySize = defaultSize;
        int mode = MeasureSpec.getMode(measureSpec);
        int size = MeasureSpec.getSize(measureSpec);

        switch (mode) {
            case MeasureSpec.UNSPECIFIED: {//如果沒有指定大小，就設定為預設大小
                mySize = defaultSize;
                break;
            }
            case MeasureSpec.AT_MOST: {//如果測量模式是最大取值為size
                //我們将自己計算View的大小
                mPaint.setTextSize(titleSize);
                mPaint.getTextBounds(titleText, 0, titleText.length(), mBound);
                float textWidth = mBound.width();
                int desired = (int) (getPaddingLeft() + textWidth + getPaddingRight());
                mySize = desired;
                break;
            }
            case MeasureSpec.EXACTLY: {//如果是固定的大小，那就不要去改變它
                mySize = size;
                break;
            }
        }
        return mySize;
    }

    public void setTitleText(String str)
    {
        titleText = str ;
        invalidate();
    }

    public void setTitleColor(int titleColor) {
        this.titleColor = titleColor;
    }

    public void setBackColor(int backColor) {
        this.backColor = backColor;
    }
}