DashLine.java

package net.coding.program.third;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathEffect;
import android.util.AttributeSet;
import android.view.View;

import net.coding.program.common.Global;

/**
 * Created by chenchao on 15/3/14.
 */
public class DashLine extends View {
    private Paint paint = null;
    private Path path = null;
    private PathEffect pe = null;

    public DashLine(Context paramContext) {
        this(paramContext, null);
    }

    public DashLine(Context paramContext, AttributeSet paramAttributeSet) {
        super(paramContext, paramAttributeSet);
        //通过R.styleable.dashedline获得我们在attrs.xml中定义的
        //<declare-styleable name="dashedline"> TypedArray
//        TypedArray a = paramContext.obtainStyledAttributes(paramAttributeSet, R.styleable.dashedline);
        //我们在attrs.xml中<declare-styleable name="dashedline">节点下
        //添加了<attr name="lineColor" format="color" />
        //表示这个属性名为lineColor类型为color。当用户在布局文件中对它有设定值时
        //可通过TypedArray获得它的值当用户无设置值是采用默认值0XFF00000
//        int lineColor = a.getColor(R.styleable.dashedline_lineColor, 0XFF000000);
//        a.recycle();
        int lineColor = 0xffc1c1c1;
        this.paint = new Paint();
        this.path = new Path();
        this.paint.setStyle(Paint.Style.STROKE);
        this.paint.setColor(lineColor);
        this.paint.setAntiAlias(true);
        this.paint.setStrokeWidth(Global.dpToPx(2));
        float[] arrayOfFloat = new float[4];
        arrayOfFloat[0] = Global.dpToPx(3);
        arrayOfFloat[1] = Global.dpToPx(2);
        arrayOfFloat[2] = Global.dpToPx(3);
        arrayOfFloat[3] = Global.dpToPx(2);
        this.pe = new DashPathEffect(arrayOfFloat, 0);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        this.path.moveTo(0.0F, 0.0F);
        this.path.lineTo(getMeasuredWidth(), 0.0F);
        this.paint.setPathEffect(this.pe);
        canvas.drawPath(this.path, this.paint);
    }

}