커스텀 뷰 예제

CustomView.java

package com.exam.order;

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

/**
 * Created by junsuk on 2016. 9. 21..
 */

public class CustomView extends View {

    private Paint mBackgroundPaint;
    private Paint mForegroundPaint;
    private int mMax = 3;
    private int mProgress = 2;

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

    public CustomView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        init();
    }

    private void init() {
        mBackgroundPaint = new Paint();
        mBackgroundPaint.setColor(Color.parseColor("#515560"));

        mForegroundPaint = new Paint();
        mForegroundPaint.setColor(Color.parseColor("#0990a1"));
    }

    @Override
    protected void onDraw(Canvas canvas) {
       Log.d(TAG, "onDraw: width " + getWidth() + " height " + getHeight());
       float circleRadius = 10f;
       float lineHeight = 6f;
       float circleY = (getHeight() / 2);
       float rectYstart = ((getHeight() / 2) - (lineHeight / 2));
       float rectYend = ((getHeight() / 2) + (lineHeight / 2));

       canvas.drawRect(circleRadius, rectYstart, getWidth() - circleRadius, rectYend, mBackgroundPaint);
       canvas.drawCircle(circleRadius, circleY, circleRadius, mBackgroundPaint);
       canvas.drawCircle(getWidth() - circleRadius, circleY, circleRadius, mBackgroundPaint);

       float width = getWidth() / (mMax - 1);
       int count = mMax - 2;
       while (count > 0) {
           canvas.drawCircle(width * count, circleY, circleRadius, mBackgroundPaint);
           count--;
       }

       float progressWidth = 0f;
       for (int i = 0; i < mMax; i++) {
           if (i < mProgress) {
               progressWidth = width * i;
               if (i == 0) {
                   canvas.drawCircle(circleRadius, circleY, circleRadius, mForegroundPaint);
               } else if (i == mMax - 1) {
                   canvas.drawCircle(progressWidth - circleRadius, circleY, circleRadius, mForegroundPaint);
               } else {
                   canvas.drawCircle(progressWidth, circleY, circleRadius, mForegroundPaint);
               }
           }
       }
       if (progressWidth != 0) {
           canvas.drawRect(circleRadius, rectYstart, progressWidth, rectYend, mForegroundPaint);
       }

   }

    public void setMax(int max) {
        mMax = max;
        invalidate();   // onDraw 호출
    }

    public void setProgress(int progress) {
        mProgress = progress;
        invalidate();
    }
    
    public void setProgressColor(int color) {
        mForegroundPaint.setColor(color);
        invalidate();
    }

}