How to Evenly Distribute Buttons Across the Width of a Linearlayout

Is it possible to evenly distribute buttons across the width of a LinearLayout

Expanding on fedj's answer, if you set layout_width to 0dp and set the layout_weight for each of the buttons to 1, the available width will be shared equally between the buttons.

How to evenly space round ImageButtons with LinearLayout

A solution I found was to use empty Spaces around and in between the buttons and have those take the extra space

    <Space
            android:layout_width="0dp"
            android:layout_height="1dp"
            android:layout_weight="1" >
    </Space>

I had to remove the weight from the actual buttons and set the width to wrap_content

 <ImageButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:srcCompat="@drawable/ic_add_black_24dp"

            android:background="@drawable/rounded"
            android:contentDescription="@string/speak_button_desc"/>

Three buttons evenly divided linear layout

Try this, I have removed Properties you should use with RelativeLayout and unnecessary with LinearLayout, and buttons aligned horizontally,

    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"

and assigned Weightsum to LinearLayout along with button height to match parents

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:weightSum="1">

        <Button
            android:id="@+id/resetDatesButton"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight=".33"
            android:onClick="resetDates"
            android:text="Rese check dates" />

        <Button
            android:id="@+id/homeButtonSearch"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight=".33"
            android:onClick="home"
            android:text="home" />

        <Button
            android:id="@+id/submitchanges"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight=".33"
            android:onClick="submitChanges"
            android:text="submit changes" />

    </LinearLayout>

</RelativeLayout>

Result

enter image description here

Evenly distribute textviews across linear layout horizontally and wrap content

Fixed it by assigning weight to 1 to all TextViews except the last one.

    public void drawLabels(List<String> labelsValues, ViewGroup container) {

    for (int i = 0; i < labelsValues.size(); i++) {
        String label = labelsValues.get(i);
        TextView textView = new TextView(mContext);
        textView.setText(label.trim());

        if (i == labelsValues.size() - 1) {
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT);
            textView.setLayoutParams(params);
        } else {
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT, 1f);
            textView.setLayoutParams(params);
        }
        container.addView(textView);
    }
}

How to align horizontally 3 fix width buttons in LinearLayout?

Basically there are 3 steps involved.

Set weightSum="3" to the parent layout. This means that the sum of the entire layout_weights is 3.
Set layout_weight="1" to each of the individual buttons. So each individual button has 1/3rd the size of the parent.

Finally set layout_width="0dp", this is important because here you don't have to set the width of the view. It will be set automatically by the layout handler.

    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Button1"
        android:layout_weight="1"/>

    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Button2"
        android:layout_weight="1"/>

    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Button3"
        android:layout_weight="1"/>

</LinearLayout>

Is it possible to evenly distribute buttons across the width of an android RELATIVE LAYOUT

How about throwing a LinearLayout inside your RelativeLayout, and adding the Buttons inside the LinearLayout (all of the buttons should have the same layout_weight).

Is it possible to evenly distribute the number of buttons in GridView?

If you're developing for API 21 and higher, GridLayout supports the concept of "weight", which may be familiar to you from LinearLayout. So you could give every cell these attrs:

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

And now your GridView (of whatever size you gave it) would be divided into three even rows and three even columns.

If you have to support earlier API levels, your best option is to use ConstraintLayout. With this strategy, you'd again give every child a width+height of 0dp, but now you'd set up chains of constraints so that each row was split evenly and each column was split evenly. Something like:

<View
    android:id="@+id/child1"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toLeftOf="@id/child2"/>

<View
    android:id="@+id/child2"
    app:layout_constraintLeft_toRightOf="@id/child1"
    app:layout_constraintRight_toLeftOf="@id/child3"/>

<View
    android:id="@+id/child3"
    app:layout_constraintLeft_toRightOf="@id/child2"
    app:layout_constraintRight_toRightOf="parent"/>

Do the same thing in the vertical direction:

<View
    android:id="@+id/child1"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintBottom_toTopOf="@id/child4"/>

<View
    android:id="@+id/child4"
    app:layout_constraintTop_toBottomOf="@id/child1"
    app:layout_constraintBottom_toTopOf="@id/child7"/>

<View
    android:id="@+id/child7"
    app:layout_constraintTop_toBottomOf="@id/child4"
    app:layout_constraintBottom_toBottomOf="parent"/>

Android ConstraintLayout : Three buttons equally distribute across the width

Here is a visual example.

Select the views
Right click and choose Chain > Create Horizontal Chain