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Merge pull request #47 from LeoAndo/feature/horizontal_list
RecyclerViewを使ったサンプル
2 parents 3912619 + 11e3915 commit e0bf11c

7 files changed

Lines changed: 211 additions & 3 deletions

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‎.idea/deploymentTargetDropDown.xml‎

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‎.idea/gradle.xml‎

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‎app/src/main/java/com/template/androidbasicapp/data/Item.java‎

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package com.template.androidbasicapp.data;
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import androidx.annotation.NonNull;
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public final class Item {
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private String title;
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public Item(@NonNull final String title) {
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this.title = title;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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}

‎app/src/main/java/com/template/androidbasicapp/ui/fragment/UiDemoFragment.java‎

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import androidx.annotation.Nullable;
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import androidx.fragment.app.Fragment;
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import androidx.navigation.fragment.NavHostFragment;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import android.os.SystemClock;
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import android.view.View;
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import com.google.android.material.snackbar.Snackbar;
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import com.template.androidbasicapp.BuildConfig;
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import com.template.androidbasicapp.R;
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import com.template.androidbasicapp.data.Item;
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import com.template.androidbasicapp.databinding.FragmentUiDemoBinding;
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import com.template.androidbasicapp.ui.widget.MyListAdapter;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.concurrent.TimeUnit;
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public class UiDemoFragment extends Fragment {
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private FragmentUiDemoBinding binding;
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} else {
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binding.map.setVisibility(View.INVISIBLE);
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}
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// リストの処理 -START
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final List<Item> items = new ArrayList<>();
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for (int i = 1; i < 29; i++) {
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items.add(new Item("鉄人" + i + "号"));
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}
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final MyListAdapter adapter = new MyListAdapter(items);
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binding.listHorizontal.setAdapter(adapter);
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// 縦向きの場合 -> LinearLayoutManager.VERTICALを指定する
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binding.listHorizontal.setLayoutManager(new LinearLayoutManager(requireContext(), LinearLayoutManager.HORIZONTAL, false));
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adapter.setOnItemClickListener(item -> {
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Snackbar.make(binding.getRoot(), item.getTitle(), Snackbar.LENGTH_LONG).show();
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});
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binding.insert.setOnClickListener(v -> {
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final String title = "鉄人" + SystemClock.elapsedRealtime() + "号";
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adapter.insertItem(0, new Item(title));
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});
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binding.update.setOnClickListener(v -> {
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adapter.updateItem(0);
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});
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binding.remove.setOnClickListener(v -> {
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adapter.removeItem(0);
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});
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// リストの処理 -END
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}
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/**

‎app/src/main/java/com/template/androidbasicapp/ui/widget/MyListAdapter.java‎

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package com.template.androidbasicapp.ui.widget;
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import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
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import android.util.Log;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.TextView;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.recyclerview.widget.RecyclerView;
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import com.template.androidbasicapp.R;
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import com.template.androidbasicapp.data.Item;
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import java.util.ArrayList;
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import java.util.List;
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public class MyListAdapter extends RecyclerView.Adapter<MyListAdapter.VH> {
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@NonNull
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public final List<Item> items;
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@Nullable
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private OnItemClickListener listener;
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public MyListAdapter(@NonNull final List<Item> items) {
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this.items = items;
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}
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@NonNull
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@Override
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public VH onCreateViewHolder(@NonNull ViewGroup parent, final int viewType) {
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View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
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return new VH(itemView);
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}
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@Override
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public void onBindViewHolder(@NonNull VH holder, final int position) {
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final Item currentItem = items.get(position);
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holder.textTitle.setText(currentItem.getTitle());
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}
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@Override
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public int getItemCount() {
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return this.items.size();
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}
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public void updateItem(final int position) {
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if (getItemCount() <= 0) return;
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final Item updateItem = items.get(position);
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updateItem.setTitle("update: " + updateItem.getTitle());
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notifyItemChanged(position);
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}
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public void insertItem(final int index, @NonNull final Item newItem) {
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items.add(index, newItem);
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notifyItemInserted(index); // 変更がある箇所だけ差分更新する.
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// notifyDataSetChanged(); // これだとリスト全体の更新が走る.
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}
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public void removeItem(final int index) {
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if (getItemCount() <= 0) return;
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items.remove(index);
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notifyItemRemoved(index);
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}
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class VH extends RecyclerView.ViewHolder {
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private static final String TAG = "VH";
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private final TextView textTitle;
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public VH(@NonNull final View itemView) {
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super(itemView);
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textTitle = itemView.findViewById(R.id.title);
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itemView.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(@NonNull final View v) {
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final int position = getAdapterPosition();
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Log.d(TAG, "onClick position-> " + position);
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if (position != NO_POSITION && listener != null) {
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listener.onItemClick(items.get(position));
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}
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}
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});
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}
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}
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public interface OnItemClickListener {
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void onItemClick(@NonNull final Item item);
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}
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public void setOnItemClickListener(@Nullable final OnItemClickListener l) {
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this.listener = l;
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}
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}

‎app/src/main/res/layout/fragment_ui_demo.xml‎

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android:gravity="center_horizontal"
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android:orientation="vertical">
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<TextView
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style="?attr/textAppearanceHeadline6"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="RecyclerView - Horizontal" />
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<LinearLayout
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:orientation="horizontal">
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<Button
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android:id="@+id/insert"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="insert" />
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<Button
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android:id="@+id/update"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="update" />
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<Button
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android:id="@+id/remove"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="remove" />
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</LinearLayout>
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<androidx.recyclerview.widget.RecyclerView
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android:id="@+id/list_horizontal"
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android:layout_width="match_parent"
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android:layout_height="wrap_content" />
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<Button
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android:id="@+id/map"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="12dp"
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android:text="Map" />
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<TextView

‎app/src/main/res/layout/list_item.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:minWidth="100dp"
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android:minHeight="100dp"
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app:cardCornerRadius="12dp">
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<TextView
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android:id="@+id/title"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_gravity="center"
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android:ellipsize="end"
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android:maxLines="1"
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tools:text="タイトル" />
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</androidx.cardview.widget.CardView>

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