即使layout_height设置为wrap_content，自定义视图对象也会占用屏幕的全部高度 [英] Custom view object using up full height of screen even when layout_height is set to wrap_content

问题描述

我创建了一个扩展了android.view.View的对象，并覆盖了draw()并将其显示在屏幕上.为了让您印象深刻，它是代表游戏得分的数字显示.它可以水平正确显示，但是占据了整个屏幕的高度-将所有其他元素推离了屏幕.

I created an object that extends android.view.View, overriding draw() and have it displaying on the screen. To put you in the picture, it is a display of digits to represent a game score. It's displaying correctly horizontally, however, it is taking up the full height of the screen - pushing all other elements off the screen.

我已经将layout_height="wrap_content"放在xml中，但是没有效果.

I've put layout_height="wrap_content" in the xml, but it has no effect.

有人知道我在做什么错吗?

Does anyone know what I am doing wrong?

推荐答案

我知道了...

我应该重写onDraw()，但这不是导致问题的原因.

I was supposed to override onDraw() but that wasn't what caused the problem.

最主要的是，我需要像这样重写onMeasure():

The main thing was, I needed to override onMeasure() like this:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    setMeasuredDimension(DIGIT_WIDTH * getNumberOfDigits(), DIGIT_HEIGHT);
}

DIGIT_WIDTH和DIGIT_HEIGHT是设置为我使用的每个数字图像的尺寸的常数. getNumberOfDigits()只是从xml属性设置的自定义属性的获取器.

DIGIT_WIDTH and DIGIT_HEIGHT are constants set to the dimensions of each digit image I used. getNumberOfDigits() is just a getter for a custom property set from the xml attributes.

希望可以帮助其他任何人.

Hope that helps anyone else coming across this.

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