EditView变形 使得每行都有一个下划线

 1     /**
 2      * A custom EditText that draws lines between each line of text that is displayed.
 3      * 这是一个自定义的EditView被画很多行再每两行的中间
 4      */
 5     public static class LinedEditText extends EditText {
 6         /*
 7          * 一个是矩形  一个是装绘  主要显示画图的样式
 8          */
 9         private Rect mRect;
10         private Paint mPaint;
11 
12         // we need this constructor for LayoutInflater
13         /*
14          * 构造函数
15          */
16         public LinedEditText(Context context, AttributeSet attrs) {
17             super(context, attrs);
18             
19             mRect = new Rect();
20             mPaint = new Paint();
21             mPaint.setStyle(Paint.Style.STROKE);
22             mPaint.setColor(0x8FF00FF);
23         }
24         /**
25          * 这个是具体的画法
26          * 
27          * (non-Javadoc)
28          * @see android.widget.TextView#onDraw(android.graphics.Canvas)
29          */
30         @Override
31         protected void onDraw(Canvas canvas) {
32             int count = getLineCount();
33             Rect r = mRect;
34             Paint paint = mPaint;
35 
36             for (int i = 0; i < count; i++) {
37                 int baseline = getLineBounds(i, r);
38 
39                 canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint);
40             }
41 
42             super.onDraw(canvas);
43         }
44     }

关键就是找到他的基准线然后再canvas上面画出来就行