自定义绘制圆环与实心圆（带文字）

自定义绘制圆环

package com.cn.myvdun;  import android.content.Context;  import android.graphics.Canvas;  import android.graphics.Paint;  import android.util.AttributeSet;  import android.view.View;  public class RingView extends View {      private final  Paint paint;      private final Context context;      public RingView(Context context) {          // TODO Auto-generated constructor stub          this(context, null);      }      public RingView(Context context, AttributeSet attrs) {          super(context, attrs);          // TODO Auto-generated constructor stub          this.context = context;          this.paint = new Paint();          this.paint.setAntiAlias(true); //消除锯齿          this.paint.setStyle(Paint.Style.STROKE); //绘制空心圆       }      @Override      protected void onDraw(Canvas canvas) {          // TODO Auto-generated method stub          int center = getWidth()/2;          int innerCircle = dip2px(context, 83); //设置内圆半径          int ringWidth = dip2px(context, 5); //设置圆环宽度          //绘制内圆          this.paint.setARGB(155, 167, 190, 206);          this.paint.setStrokeWidth(2);          canvas.drawCircle(center,center, innerCircle, this.paint);          //绘制圆环          this.paint.setARGB(255, 212 ,225, 233);          this.paint.setStrokeWidth(ringWidth);          canvas.drawCircle(center,center, innerCircle+1+ringWidth/2, this.paint);          //绘制外圆          this.paint.setARGB(155, 167, 190, 206);          this.paint.setStrokeWidth(2);          canvas.drawCircle(center,center, innerCircle+ringWidth, this.paint);          super.onDraw(canvas);      }      /**      * 根据手机的分辨率从 dp 的单位 转成为 px(像素)      */      public static int dip2px(Context context, float dpValue) {          final float scale = context.getResources().getDisplayMetrics().density;          return (int) (dpValue * scale + 0.5f);      }  }  

//之后XML布局中引用就OK了

自定义绘制圆环（带文字）

import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.support.v4.content.ContextCompat;import android.util.AttributeSet;import android.view.View;public class CircleView extends View {    private Paint mPaintCircle;    private Paint mPaintText;    public CircleView(Context context) {        this(context, null);    }    public CircleView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context, attrs);    }    private void init(Context context, AttributeSet attrs) {        mPaintCircle = new Paint(Paint.ANTI_ALIAS_FLAG);        //添加文字的画加入以下代码         mPaintText = new Paint(Paint.ANTI_ALIAS_FLAG);        mPaintText.setColor(ContextCompat.getColor(context, android.R.color.black));        mPaintText.setTextSize(40F);        mTextStr = "正正正正正正正正";        mBoundText = new Rect();        mPaintText.getTextBounds(mTextStr, 0, mTextStr.length(), mBoundText);        mTextWidth = mBoundText.width();        mTextHeight = mBoundText.height();    }    private int mWidth;    private int mHeight;    private float mRadius;    protected void onSizeChanged (int w, int h, int oldw, int oldh) {        mWidth = w;  // x 的值就是宽度的一半        mHeight = h;  // y 的值就是高度的一半        mRadius = Math.min(mWidth / 2, mHeight / 2);  // 得到了radius的值    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawCircle(mWidth / 2, mHeight / 2, mRadius, mPaintCircle);        //添加文字添加        canvas.drawText(mTextStr, (mWidth-mTextWidth) / 2, (mHeight + mTextHeight) / 2, mPaintText);    }}

更详细的了解请去原地址查看