英文:
Android Canvas Area is not full screen. How to set canvas area?
问题
你好。
我在Android画布上绘制了一个矩形覆盖层。
canvas.drawRect(0, 0, 1000, 1000, paint);
这是我的代码。我设置起始点为(0,0)，即(左，上)坐标。
但是(0,0)不位于全屏的左上角端点。
无论宽度和高度如何，画布也无法覆盖整个屏幕。
我该如何解决这个问题？
英文:
Hello.
I draw a rectangle overlay on Android Canvas.
canvas.drawRect(0, 0, 1000, 1000, paint);
That is my code. I set start point is (0,0) that is (left, top) coordinate.
But (0,0) is not on a left-top end point of full screen.
No matter how width and height are big, canvas cannot cover full screen also.
How can I solve this problem?
答案1
得分: 1
如果您想要全屏查看，请使用setContentView(canvas)调用。这将将完整的画布视图设置为布局。
英文:
If you want a fullscreen view, use the setContentView(canvas) call. That sets the full canvas view as the layout.
答案2
得分: 0
你的问题在于，默认情况下，XML 使用一个称为 Titlebar 的东西，可以在这里找到答案。除了移除 Titlebar 外，你还可以将活动设置为全屏，通过使用这个解决方案来移除状态栏。
确保你的活动从 Activity 而不是 ActionBarActivity 进行导入。
另外，在设置位置或大小时最好避免使用实际数字，特别是当目标是覆盖整个屏幕时。你可以通过使用 getWidth() 和 getHeight() 来获取屏幕的宽度和高度：
canvas.drawRect(0, 0, getWidth(), getHeight());
请务必仅在调用 onDraw 方法后或其中使用这些方法，否则它们的值将等于 0，因为画布尚未初始化。
英文:
Your issue is that by default, XML uses a thing called Titlebar, as answered here. Along with removing the Titlebar, you can set your activity to full-screen and also remove the status-bar by using this solution.
Make sure that your activity imports from Activity rather than ActionBarActivity.
Also, it is better to avoid using actual numbers when setting a position or a size, and especially when the goal is to cover the entire screen. You can get the width and height of the screen by using getWidth() and getHeight() accordingly:
canvas.drawRect(0, 0, getWidth(), getHeight());
Make sure to use these methods only in or after the onDraw method was called, else their values will be equal to 0 since the canvas was not yet initialized.
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