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我正在创建一个应用程序，其中显示了一个相机，并在屏幕上显示了一个选项来隐藏和显示屏幕上的网格。我通过 CustomView 创建了这个网格，它工作正常。但是当我隐藏网格并单击显示时，水平线没有显示...请帮助...

自定义视图

<com.***.GridLinesView
    android:id="@+id/cameraView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true" />

OnClick 隐藏/取消隐藏按钮

        @Override
        public void onClick(View v) {
            // get an image from the camera
            View grid = (View)findViewById(R.id.cameraView1);

            if(grid.getVisibility() == View.VISIBLE)
                grid.setVisibility(View.INVISIBLE);
            else
                grid.setVisibility(View.VISIBLE);
                }

自定义视图

public class GridLinesView extends View {

    private Paint p;
    int width = 0;
    int height = 0;
    int pass = 0;
    int xpos = 0;
    int ypos = 0;

    public GridLinesView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        p = new Paint();
        p.setColor(Color.WHITE);
        p.setStyle(Paint.Style.STROKE);
        p.setStrokeWidth(1);
        p.setAntiAlias(true);
    }

    public GridLinesView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        p = new Paint();
        p.setColor(Color.WHITE);
        p.setStyle(Paint.Style.STROKE);
        p.setStrokeWidth(1);
        p.setAntiAlias(true);
    }

    public GridLinesView(Context context, AttributeSet attrs) {
        super(context, attrs);
        p = new Paint();
        p.setColor(Color.WHITE);
        p.setStyle(Paint.Style.STROKE);
        p.setStrokeWidth(1);
        p.setAntiAlias(true);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        width = getWidth();
        height = getHeight();
        int ratio = 5;
        if(width < 300 || height < 300){
            ratio = 3;
        }
        xpos = width / ratio;
        ypos = height / ratio;
        p.setStyle(Style.STROKE);
        for (int i = 0; i < ratio; i++) {
            p.setColor(Color.argb(100, 255, 255, 255));
            canvas.drawLine(0, (ypos * pass) + ratio, width, (ypos * pass) + ratio, p);
            pass++;

        }
        for (int i = 0; i < ratio; i++) {

            p.setColor(Color.argb(100, 255, 255, 255));
            canvas.drawLine(xpos + (xpos * i), 0, xpos + (xpos * i), height, p);

        }
    }

}

任何帮助将是可观的......谢谢。

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