如何实现平等的layout_width和layout_height [英] How to achieve equal layout_width and layout_height
问题描述
我要实现的目标是将4个按钮彼此相邻放置,并留有一定的边距,使它们为正方形(不提供固定大小)
What I am trying to achieve is to put 4 buttons next to each other, with some margins, and make them square (without supplying fixed sizes)
我基本上有一个包装器LinearLayout
,其中包含4个按钮,我希望它们是正方形的.
I basically have a wrapper LinearLayout
that holds 4 buttons, which I want them to be square shaped.
<LinearLayout
android:id="@+id/photos_photoWrapper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orienation="vertical">
<Button
android:id="@+id/photos_photoButton1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
/>
<Button
android:id="@+id/photos_photoButton2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
/>
<Button
android:id="@+id/photos_photoButton3"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
/>
<Button
android:id="@+id/photos_photoButton4"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
/>
</LinearLayout>
我尝试了这段代码
Button iv = (Button)findViewById(R.id.photos_photoButton1);
boolean bPost = iv.post(
new Runnable()
{
public void run()
{
Button iv = (Button)findViewById(R.id.photos_photoButton1);
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)iv.getLayoutParams();
params.width = findViewById(R.id.photos_photoButton1).getWidth();
params.height = params.width;
iv.setLayoutParams(params);
}
});
if (bPost == false)
{
throw new RuntimeException("runnable not posted");
}
然而,似乎按钮的比例却翻了一番,仍然是相同的比例.
Yet it just seemed to double up the scale of buttons, still with same proportions.
推荐答案
您可以创建Button
的自定义子类并覆盖onMeasure
,例如:
You can create a custom subclass of Button
and override onMeasure
, for example:
public class SquareButton extends Button {
public SquareButton(Context context) {
super(context);
}
public SquareButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth());
}
}
要在布局文件中使用SquareButton
,请将Button
声明更改为以下内容:
To use SquareButton
in your layout file, change your Button
declarations to the following:
<your.package.name.SquareButton
android:id="@+id/photos_photoButton1"
android:layout_width="[DESIRED WIDTH]dp"
android:layout_height="0dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
/>
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