机器人，如何绘制的EditText虚线

问题描述

我refered此链接：我如何做一个点/虚线的Andr​​oid？和使用 DashPathEffect 。但是，这并不为我工作？为什么？我的code：

 公共类NoteEditText扩展的EditText {
    私人油漆mPaint;

    公共NoteEditText（上下文的背景下）{
        超（上下文）;
    }

    公共NoteEditText（上下文的背景下，ATTRS的AttributeSet）{
        超（背景下，ATTRS）;
        mPaint =新的油漆（）;
        mPaint.setStrokeWidth（1）;
        mPaint.setStyle（Paint.Style.FILL_AND_STROKE）;
        mPaint.setColor（Color.DKGRAY）;
        PathEffect效果​​=新DashPathEffect（新浮法[] {5,5,5,5}，1）;
        mPaint.setPathEffect（效果）;
    }

    @覆盖
    公共无效的OnDraw（帆布油画）{
        super.onDraw（画布）;

        INT高= this.getHeight（）;
        INT lineHeight是= this.getLineHeight（）;
        INT LINENUM =身高/ lineHeight是;
        L.l（行数：+ LINENUM）;
        的for（int i = 0; I＆LT; LINENUM;我++）{
            INT Y =第（i + 1）* lineHeight是;
            canvas.drawLine（0，Y，this.getWidth（） -  1，Y，mPaint）;
        }
    }
}
 

解决方案

该方法setPathEffect不受硬件加速的支持。默认情况下它是打开的（我认为，由于Android 4.0）

的

您可以关闭硬件加速在构造函数中具有以下code片断：

I refered to this link: How do I make a dotted/dashed line in Android?, and used DashPathEffect. But this does not work for me? why? my code:

public class NoteEditText extends EditText {
    private Paint mPaint;

    public NoteEditText(Context context) {
        super(context);
    }

    public NoteEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        mPaint = new Paint();
        mPaint.setStrokeWidth(1);
        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
        mPaint.setColor(Color.DKGRAY);
        PathEffect effects = new DashPathEffect(new float[]{5,5,5,5},1);
        mPaint.setPathEffect(effects);
    }

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        int height = this.getHeight();
        int lineHeight = this.getLineHeight();
        int lineNum = height / lineHeight;
        L.l("line count: " + lineNum);
        for (int i = 0; i < lineNum; i++) {
            int y = (i + 1) * lineHeight;
            canvas.drawLine(0, y, this.getWidth() - 1, y, mPaint);
        }
    }
}

解决方案

The method setPathEffect is not supported by hardware acceleration. By default it is turned on (I think since Android 4.0)

http://developer.android.com/guide/topics/graphics/hardware-accel.html#unsupported

You can turn off hardware acceleration inside the constructor with following code snippet:

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