在自定义的圆里中间写入文字

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package com.example.kirito.animation360_1.view;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;/** * Created by kirito on 2016.11.24. */public class FloatCircleView extends View {    public int width = 150;    public int height = 150;    private Paint circlePaint;    private Paint textPaint;    private static final String TAG = "FloatCircleView";    //三个构造函数都必须调用，否则无法正常使用自定义view    public FloatCircleView(Context context) {        this(context,null);    }    public FloatCircleView(Context context, AttributeSet attrs) {        this(context, attrs,0);    }    public FloatCircleView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        initPaint();    }    public void initPaint(){        circlePaint = new Paint();        circlePaint.setAntiAlias(true);        circlePaint.setColor(Color.BLUE);        textPaint = new Paint();        textPaint.setAntiAlias(true);        textPaint.setTextSize(25);        textPaint.setColor(Color.RED);        textPaint.setFakeBoldText(true);    }    @Override    protected void onDraw(Canvas canvas) {        canvas.drawCircle(width / 2,width / 2,width / 2,circlePaint);        String text = "50%";        float textWidth = textPaint.measureText(text);        float x = (width - textWidth) / 2;        Paint.FontMetrics metrics = textPaint.getFontMetrics();        //ascent是负的，descent是正的，dy是正的        float dy = -(metrics.ascent + metrics.descent) / 2;        float y = height / 2 + dy;        canvas.drawText(text,x,y,textPaint);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        setMeasuredDimension(width,height);    }}
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