CustomCompassView.java

package com.tekinarslan.material.sample.customui;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

import com.apkfuns.logutils.LogUtils;

/**
 * Created by cdj on 2015/9/23.
 */
public class CustomCompassView extends View {
    private Paint paint;
    public CustomCompassView(Context context) {
        super(context);
//        LogUtils.d("000000000000000");
    }

    public CustomCompassView(Context context, AttributeSet attrs) {
        super(context, attrs);
//        LogUtils.d("1111111111111111111111");
        paint = new Paint();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        LogUtils.d("2222222222222222");
        drawCompass(canvas);
//        paint.setAntiAlias(true);
//        paint.setStyle(Paint.Style.STROKE);
//        paint.setStrokeWidth(2);
//        int dx = 250;
//        int dy = 150;
//        for (int i =0;i<360/30;i++){
//            LogUtils.d("i * 30="+i * 30);
//            canvas.save();
//            canvas.rotate(i * 30, dx, dy);
//            canvas.drawLine(dx, dy, dx, 0, paint);
//            canvas.restore();
//        }
    }

    private void drawCompass(Canvas canvas) {
        int radius = 200;
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.STROKE);
        canvas.translate(canvas.getWidth() / 2, canvas.getWidth() / 2); //将位置移动画纸的坐标点:150,150
        LogUtils.d("canvas.getWidth() / 2=" + canvas.getWidth() / 2);
        canvas.drawCircle(0, 0, radius, paint); //画圆圈

        //使用path绘制路径文字
        canvas.save();
        canvas.translate(-150, -150);
        Path path = new Path();
        path.addArc(new RectF(0,0,300,300), -150, 180);
        Paint citePaint = new Paint(paint);
        citePaint.setTextSize(14);
        citePaint.setStrokeWidth(1);
        canvas.drawTextOnPath("http://www.android777.com.www.android777", path, 28, 0, citePaint);
        canvas.restore();

        Paint tmpPaint = new Paint(paint); //小刻度画笔对象
        tmpPaint.setStrokeWidth(1);

        float  y=200;
        int count = 60; //总刻度数

        for(int i=0 ; i <count ; i++){
            if(i%5 == 0){
                canvas.drawLine(0f, y, 0, y+12f, paint);
                canvas.drawText(String.valueOf(i/5+1), -4f, y+25f, tmpPaint);
            }else{
                canvas.drawLine(0f, y, 0f, y +5f, tmpPaint);
            }
            canvas.rotate(360/count,0f,0f); //旋转画纸
        }

        //绘制指针
        tmpPaint.setColor(Color.GRAY);
        tmpPaint.setStrokeWidth(4);
        canvas.drawCircle(0, 0, 7, tmpPaint);
        tmpPaint.setStyle(Paint.Style.FILL);
        tmpPaint.setColor(Color.YELLOW);
        canvas.drawCircle(0, 0, 5, tmpPaint);
        canvas.drawLine(0, 10, 0, -95, paint);
    }
}