Android GridLayout Equal Column Widths

Question

Is it really not possible to easily force equal column widths in an Android GridLayout? Trying the obvious layout...

<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:columnCount="4"     android:rowCount="8"     tools:context=".MainActivity" >      <Button         android:id="@+id/button1"         android:layout_gravity="center"         android:text="Button 1" />     <Button         android:id="@+id/button2"         android:layout_gravity="center"         android:text="Button 2" />     <Button         android:id="@+id/button3"         android:layout_gravity="center"         android:text="Button 3" />     <Button         android:id="@+id/button4"         android:layout_gravity="center"         android:text="Button 4" />  </GridLayout> 

... leaves the rightmost button centered in a column that is clearly wider than the other three. (Play with the button text and you can easily get worse examples.)

I read the Android documentation regarding excess space distribution in GridLayouts, but it seems so obvious that even column widths are often (any maybe even typically) wanted in a situation like this that I have to believe I'm missing something obvious/easy.

Answer 1

Just use column weight for GridLayout's children:

android:layout_width="0dp" android:layout_columnWeight="1" 

Remember using support library if your project's MinSdk < API 21:

implementation 'com.android.support:appcompat-v7:27.1.1'  implementation 'com.android.support:gridlayout-v7:27.1.1' 

You should use android.support.v7.widget.GridLayout instead of GridLayout. And don't forget using app namespace when using support library:

xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="0dp" app:layout_columnWeight="1" 

UPD:

If you make your GridLayout programmatically, use GridLayout.Spec. For example:

GridLayout.LayoutParams layoutParams = new GridLayout.LayoutParams(     GridLayout.spec(GridLayout.UNDEFINED, 1f),     GridLayout.spec(GridLayout.UNDEFINED, 1f) );  layoutParams.width = 0;  yourChildView.setLayoutParams(layoutParams); yourGridLayout.addView(yourChildView); 

(for every child view)