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[ButtonGroup] Add a demo to programmatically add/remove buttons in a button group.
PiperOrigin-RevId: 751060643
1 parent 8e52e94 commit 4f55422

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5 files changed

+147
-1
lines changed

5 files changed

+147
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‎catalog/java/io/material/catalog/button/ButtonGroupRuntimeDemoFragment.java

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/*
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* Copyright 2025 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.material.catalog.button;
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import io.material.catalog.R;
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import android.annotation.SuppressLint;
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import android.os.Bundle;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.view.ViewGroup;
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import android.widget.Button;
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import android.widget.LinearLayout.LayoutParams;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import com.google.android.material.button.MaterialButton;
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import com.google.android.material.button.MaterialButtonGroup;
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import io.material.catalog.feature.DemoFragment;
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/** A fragment that displays a button group demo for adding and removing buttons at runtime. */
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public class ButtonGroupRuntimeDemoFragment extends DemoFragment {
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private static final int MAX_COUNT = 10;
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private int buttonCount;
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private Button addButton;
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private Button removeButton;
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/**
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* Create a Demo View with {@link MaterialButtonGroup}, in which, buttons are added and removed at
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* runtime.
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*/
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@Nullable
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@Override
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public View onCreateDemoView(
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@NonNull LayoutInflater layoutInflater,
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@Nullable ViewGroup viewGroup,
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@Nullable Bundle bundle) {
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View view =
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layoutInflater.inflate(
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R.layout.cat_buttons_group_runtime_fragment, viewGroup, /* attachToRoot= */ false);
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MaterialButtonGroup buttonGroup = view.findViewById(R.id.cat_dynamic_button_group);
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addButton = view.findViewById(R.id.cat_add_button);
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removeButton = view.findViewById(R.id.cat_remove_button);
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updateControl();
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addButton.setOnClickListener(
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new OnClickListener() {
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@SuppressLint("SetTextI18n")
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@Override
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public void onClick(View v) {
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MaterialButton button = new MaterialButton(view.getContext());
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button.setText("Button");
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buttonGroup.addView(
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button,
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-1,
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new LayoutParams(
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ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1));
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buttonCount++;
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updateControl();
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}
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});
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removeButton.setOnClickListener(
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v -> {
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buttonGroup.removeViewAt(buttonGroup.getChildCount() - 1);
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buttonCount--;
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updateControl();
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});
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return view;
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}
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private void updateControl(){
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if(buttonCount == 0){
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removeButton.setEnabled(false);
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}else if(buttonCount == MAX_COUNT){
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addButton.setEnabled(false);
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}else{
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addButton.setEnabled(true);
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removeButton.setEnabled(true);
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}
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}
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}

‎catalog/java/io/material/catalog/button/ButtonsFragment.java

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@@ -67,6 +67,13 @@ public List<Demo> getAdditionalDemos() {
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public Fragment createFragment() {
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return new ButtonGroupDistributionDemoFragment();
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}
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},
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new Demo(R.string.cat_buttons_group_runtime) {
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@Nullable
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@Override
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public Fragment createFragment() {
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return new ButtonGroupRuntimeDemoFragment();
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}
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});
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}
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‎catalog/java/io/material/catalog/button/res/layout/cat_buttons_group_runtime_fragment.xml

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<?xml version="1.0" encoding="utf-8"?>
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<!--
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Copyright 2025 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:paddingTop="8dp"
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android:paddingHorizontal="8dp"
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android:gravity="center_horizontal"
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android:orientation="vertical">
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<com.google.android.material.button.MaterialButtonGroup
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android:id="@+id/cat_dynamic_button_group"
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android:layout_width="match_parent"
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android:layout_height="wrap_content">
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</com.google.android.material.button.MaterialButtonGroup>
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<Button
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android:id="@+id/cat_add_button"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/cat_button_group_runtime_add"/>
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<Button
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android:id="@+id/cat_remove_button"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/cat_button_group_runtime_remove"/>
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</LinearLayout>

‎catalog/java/io/material/catalog/button/res/values/strings.xml

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<string name="cat_toc_buttons">Buttons</string>
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<string name="cat_buttons_group" translatable="false">Buttons Group</string>
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<string name="cat_buttons_group_distribution" translatable="false">Buttons Group Distribution</string>
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<string name="cat_buttons_group_runtime" translatable="false">Buttons Group Runtime</string>
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<string name="cat_buttons_toggle_group">Buttons Toggle Group</string>
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<string name="cat_split_button" translatable="false">Split Button</string>
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<string name="cat_buttons_title">Buttons</string>
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<string name="cat_button_play_icon">play icon</string>
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<string name="cat_button_next_icon">next icon</string>
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<string name="cat_button_toggleable">Toggleable</string>
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<string name="cat_button_group_runtime_add">Add</string>
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<string name="cat_button_group_runtime_remove">Remove</string>
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</resources>

‎lib/java/com/google/android/material/button/MaterialButtonGroup.java

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@@ -476,7 +476,7 @@ void onButtonWidthChanged(@NonNull MaterialButton button, int increaseSize) {
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* buttons,
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*/
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private void adjustChildSizeChange() {
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if (buttonSizeChange == null) {
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if (buttonSizeChange == null || getChildCount() == 0) {
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return;
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}
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int firstVisibleChildIndex = getFirstVisibleChildIndex();

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