在Android的UI開發中，有時為了介面美觀而需要虛線。我自己實現一個虛線控制元件。

package com.custom;

   import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathEffect;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
/**
 * 畫虛線元件
 * @author linweidong
 * @Date   2010-09-15
 */
public class DashedLine extends View {
    private final String namespace = "http://com.smartmap.driverbook";
    private float startX;
    private float startY;
    private float endX;
    private float endY;
    private Rect mRect;
 
    public DashedLine(Context context, AttributeSet attrs) {
        super(context, attrs);         
       
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);       
        Paint paint = new Paint();
        paint.setStyle(Paint.Style.STROKE);
        paint.setColor(Color.DKGRAY);
        Path path = new Path();    
        path.moveTo(0, 10);
        path.lineTo(480,10);     
        PathEffect effects = new DashPathEffect(new float[]{5,5,5,5},1);
        paint.setPathEffect(effects);
        canvas.drawPath(path, paint);
    }

在layout資料夾下的xml引用這個控制元件

   <com.custom.DashedLine
        android:id="@+id/dashedLine"
        android:layout_width="wrap_content"        
        android:layout_height="20px"             
                      
         />