带有方形按钮的 Android 布局
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Android layout with square buttons
提问by whlk
I want to make a layout similar to this one:
我想做一个类似于这个的布局：
www.ImageBanana.net - layout.png http://www.imagebanana.com/img/9kmlhy66/thumb/layout.png
www.ImageBanana.net - layout.png http://www.imagebanana.com/img/9kmlhy66/thumb/layout.png
Four square buttons on the screen - each of those using half of the screen with/screen height (whichever is smaler). Independent of screen size/resolution.
屏幕上的四个方形按钮 - 每个按钮使用屏幕的一半/屏幕高度（以较小者为准）。独立于屏幕尺寸/分辨率。
I already tried to achieve this by using a LinearLayoutbut the buttons are ending up using the correct width, but still having the height of the background (not square any more).
我已经尝试通过使用 a 来实现这一点，LinearLayout但按钮最终使用了正确的宽度，但仍然具有背景的高度（不再是方形）。
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:layout_height="wrap_content"
style="@style/CKMainButton"
android:layout_width="fill_parent"
android:text="@string/sights"
android:id="@+id/ApplicationMainSight"
android:layout_toLeftOf="@+id/ApplicationMainEvent"></Button>
<Button
android:layout_height="wrap_content"
style="@style/CKMainButton"
android:layout_width="fill_parent"
android:text="@string/sights"
android:id="@+id/ApplicationMainSight"
android:layout_toLeftOf="@+id/ApplicationMainEvent"></Button>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:layout_height="wrap_content"
style="@style/CKMainButton"
android:layout_weight="1"
android:layout_width="fill_parent"
android:text="@string/usergenerated"
android:id="@+id/ApplicationMainUserGenerated" />
<Button
android:layout_height="wrap_content"
style="@style/CKMainButton"
android:layout_weight="1"
android:layout_width="fill_parent"
android:text="@string/tours"
android:id="@+id/ApplicationMainTour"/>
</LinearLayout>
</LinearLayout>
It's looking like this: www.ImageBanana.net - layout2.png http://www.imagebanana.com/img/i2ni6g4/thumb/layout2.png
它看起来像这样：www.ImageBanana.net - layout2.png http://www.imagebanana.com/img/i2ni6g4/thumb/layout2.png
How can i acchieve the Layout to look like the image at the top above?
我怎样才能使布局看起来像上面顶部的图像？
回答by Jan Němec
import android.content.Context;
import android.util.AttributeSet;
import android.widget.LinearLayout;
public class SquareLayout extends LinearLayout {
// Desired width-to-height ratio - 1.0 for square
private final double mScale = 1.0;
public SquareLayout(Context context) {
super(context);
}
public SquareLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
if (width > (int)((mScale * height) + 0.5)) {
width = (int)((mScale * height) + 0.5);
} else {
height = (int)((width / mScale) + 0.5);
}
super.onMeasure(
MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY)
);
}
}
回答by Ronald
My solution is similar to the first one, however, I do the resizing in the onLayout method. Don't know which one is better.
我的解决方案与第一个类似，但是，我在 onLayout 方法中调整大小。不知道哪个更好。
For convenience I've wrapped my solution in a nice Android Library, see https://github.com/ronaldsteen/Android-SquareLayout-Library
为方便起见，我将我的解决方案包装在一个不错的 Android 库中，请参阅https://github.com/ronaldsteen/Android-SquareLayout-Library
回答by Hymany
I recommend the following way, it's straightforward and works
我推荐以下方式，它很简单而且有效
public class SquareLayout extends RelativeLayout {
public SquareLayout(Context context) {
super(context);
}
public SquareLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
}
回答by Eugene Brusov
You can achieve this using ConstraintLayout. You should just add vertical guideline with the position of 50% screen width, align your buttons to the left and right side of the guideline and size them in 1:1 aspect ratio. Everything can be done in layout XML file, no additional source code required.
您可以使用ConstraintLayout实现这一点。您应该只在 50% 屏幕宽度的位置添加垂直参考线，将按钮与参考线的左侧和右侧对齐，并以 1:1 的纵横比调整它们的大小。一切都可以在布局 XML 文件中完成，不需要额外的源代码。
Once you've completed all of these steps, you'll end up with something like this:
完成所有这些步骤后，您将得到如下结果：
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@android:color/holo_orange_light"
android:text="1"
app:layout_constraintDimensionRatio="H,1:1"
app:layout_constraintEnd_toStartOf="@+id/guideline"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@android:color/holo_blue_light"
android:text="2"
app:layout_constraintDimensionRatio="W,1:1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/guideline"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button3"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@android:color/holo_green_dark"
android:text="3"
app:layout_constraintDimensionRatio="W,1:1"
app:layout_constraintEnd_toStartOf="@+id/guideline"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button1" />
<Button
android:id="@+id/button4"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@android:color/holo_purple"
android:text="4"
app:layout_constraintDimensionRatio="W,1:1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/button2" />
<android.support.constraint.Guideline
android:id="@+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.5" />
</android.support.constraint.ConstraintLayout>
Here's how this layout looks on smallest vs largest screens:
以下是此布局在最小和最大屏幕上的外观：
回答by Bondax
I'm usually doing things like that:
我通常做这样的事情：
View v; // the view i want to layout squared
v.measure(1,1);
int size = v.getMeasuredHeight(); // or v.getMeasuredWidth()...
LayoutParams params = ... // either your own, or returned from View
params.width = size;
params.height = size;
v.setLayoutParams(params);
This is certainly not the most sophisticated code, as it leaves most capabilities that can be exploited in MeasureSpec, but it gets the job done, as 'v.measure(1,1)' just says "Measure my view as it is!".
这当然不是最复杂的代码，因为它留下了可以在 MeasureSpec 中利用的大多数功能，但它完成了工作，因为“v.measure(1,1)”只是说“按原样测量我的视图！” .
The absolute plus in my approach is that you don't have to subclass anything and you don't have to add some OnGlobalLayoutListenerto your ViewTreeObserver. This works all at the spot where you build or inflate your layout in code.
我的方法的绝对优势是您不必对任何内容进行子类化，也不必OnGlobalLayoutListener在ViewTreeObserver. 这适用于您在代码中构建或扩充布局的地方。
回答by reflog
ok, here's a revised example:
好的，这是一个修改后的示例：
<?xml version="1.0" encoding="utf-8"?>
<ViewFlipper xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent" android:layout_width="fill_parent">
<RelativeLayout android:id="@+id/magaLoginLayout"
android:layout_height="fill_parent" android:layout_width="fill_parent">
<Button android:text="@+id/Button01" android:id="@+id/Button01"
android:layout_width="160dip" android:layout_height="160dip" android:layout_marginTop="20dip"></Button>
<Button android:text="@+id/Button03" android:layout_below="@+id/Button01" android:id="@+id/Button03"
android:layout_alignLeft="@+id/Button01" android:layout_height="160dip" android:layout_width="160dip"></Button>
<Button android:text="@+id/Button04" android:layout_below="@+id/Button01" android:id="@+id/Button04"
android:layout_toRightOf="@+id/Button03" android:layout_height="160dip" android:layout_width="160dip"></Button>
<Button android:text="@+id/Button02" android:id="@+id/Button02" android:layout_width="wrap_content"
android:layout_toRightOf="@+id/Button01" android:layout_alignTop="@+id/Button01" android:layout_alignParentRight="true" android:layout_height="160dip"></Button>
</RelativeLayout>
</ViewFlipper>
