TextView下划线效果

TextView下划线效果

支持行间距的设置，padding属性的设置，功能简单，代码也简单。

代码

@SuppressLint("AppCompatCustomView")
public class LinedTextView extends TextView {
    public LinedTextView(Context context) {
        this(context,null);
    }

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

    public LinedTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setPadding(0,0,0,5);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Paint mPaint = new Paint();
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(1);
        mPaint.setColor(Color.BLACK);

        int right = getRight();
        int paddingTop = getPaddingTop();
        int paddingBottom = getPaddingBottom();
        int paddingLeft = getPaddingLeft();
        int paddingRight = getPaddingRight();
        float height = getHeight()-paddingBottom-paddingTop;
        float lineCount = getLineCount();
        float lineHeight =(height/lineCount);
         float baseline=0;
        for (int i = 0; i < lineCount; i++) {
            baseline = lineHeight * (i + 1) + paddingTop;
            canvas.drawLine(0 + paddingLeft, baseline, right - paddingRight, baseline, mPaint);
        }
        super.onDraw(canvas);
    }

    /**
     * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
     */
    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }
}