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PatilShreyassamtstern
PatilShreyas
authored and
samtstern
committed
Realtime Database Pagination (#1603)
1 parent 7c631c4 commit d170531

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15 files changed

+910
-2
lines changed

15 files changed

+910
-2
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‎app/src/main/AndroidManifest.xml‎

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@@ -55,6 +55,12 @@
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<activity
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android:name=".database.realtime.RealtimeDbChatActivity"
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android:label="@string/title_realtime_database_activity" />
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<!-- Realtime database paging demo -->
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<activity
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android:name=".database.realtime.FirebaseDbPagingActivity"
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android:label="@string/title_paging_database_activity" />
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<activity
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android:name=".database.realtime.RealtimeDbChatIndexActivity"
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android:label="@string/title_realtime_database_activity" />

‎app/src/main/java/com/firebase/uidemo/ChooserActivity.java‎

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import com.firebase.uidemo.auth.AuthUiActivity;
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import com.firebase.uidemo.database.firestore.FirestoreChatActivity;
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import com.firebase.uidemo.database.firestore.FirestorePagingActivity;
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import com.firebase.uidemo.database.realtime.FirebaseDbPagingActivity;
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import com.firebase.uidemo.database.realtime.RealtimeDbChatActivity;
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import com.firebase.uidemo.storage.ImageActivity;
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@@ -71,6 +72,7 @@ private static class ActivityChooserAdapter
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FirestoreChatActivity.class,
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FirestorePagingActivity.class,
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RealtimeDbChatActivity.class,
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FirebaseDbPagingActivity.class,
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ImageActivity.class,
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};
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@@ -80,6 +82,7 @@ private static class ActivityChooserAdapter
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R.string.title_firestore_activity,
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R.string.title_firestore_paging_activity,
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R.string.title_realtime_database_activity,
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R.string.title_paging_database_activity,
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R.string.title_storage_activity
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};
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@@ -89,6 +92,7 @@ private static class ActivityChooserAdapter
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R.string.desc_firestore,
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R.string.desc_firestore_paging,
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R.string.desc_realtime_database,
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R.string.desc_paging_database,
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R.string.desc_storage
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};
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‎app/src/main/java/com/firebase/uidemo/database/realtime/FirebaseDbPagingActivity.java‎

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package com.firebase.uidemo.database.realtime;
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import android.arch.paging.PagedList;
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import android.os.Bundle;
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import android.support.annotation.NonNull;
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import android.support.annotation.Nullable;
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import android.support.v4.widget.SwipeRefreshLayout;
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import android.support.v7.app.AppCompatActivity;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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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 android.widget.Toast;
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import com.firebase.ui.database.paging.DatabasePagingOptions;
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import com.firebase.ui.database.paging.FirebaseRecyclerPagingAdapter;
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import com.firebase.ui.database.paging.LoadingState;
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import com.firebase.uidemo.R;
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import com.google.firebase.database.DatabaseError;
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import com.google.firebase.database.FirebaseDatabase;
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import com.google.firebase.database.Query;
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import butterknife.BindView;
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import butterknife.ButterKnife;
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public class FirebaseDbPagingActivity extends AppCompatActivity {
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private final String TAG = "PagingActivity";
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@BindView(R.id.paging_recycler)
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RecyclerView mRecycler;
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@BindView(R.id.swipe_refresh_layout)
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SwipeRefreshLayout mSwipeRefreshLayout;
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private Query mQuery;
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@Override
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protected void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_database_paging);
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ButterKnife.bind(this);
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mQuery = FirebaseDatabase.getInstance().getReference().child("posts");
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setUpAdapter();
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}
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private void setUpAdapter() {
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//Initialize Paging Configurations
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PagedList.Config config = new PagedList.Config.Builder()
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.setEnablePlaceholders(false)
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.setPrefetchDistance(5)
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.setPageSize(30)
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.build();
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//Initialize Firebase Paging Options
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DatabasePagingOptions<Post> options = new DatabasePagingOptions.Builder<Post>()
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.setLifecycleOwner(this)
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.setQuery(mQuery, config, Post.class)
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.build();
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//Initializing Adapter
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final FirebaseRecyclerPagingAdapter<Post, PostViewHolder> mAdapter =
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new FirebaseRecyclerPagingAdapter<Post, PostViewHolder>(options) {
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@NonNull
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@Override
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public PostViewHolder onCreateViewHolder(@NonNull ViewGroup parent,
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int viewType) {
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View view = LayoutInflater.from(parent.getContext())
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.inflate(R.layout.item_post, parent, false);
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return new PostViewHolder(view);
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}
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@Override
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protected void onBindViewHolder(@NonNull PostViewHolder holder,
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int position,
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@NonNull Post model) {
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holder.bind(model);
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}
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@Override
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protected void onLoadingStateChanged(@NonNull LoadingState state) {
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switch (state) {
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case LOADING_INITIAL:
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case LOADING_MORE:
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mSwipeRefreshLayout.setRefreshing(true);
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break;
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case LOADED:
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mSwipeRefreshLayout.setRefreshing(false);
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break;
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case FINISHED:
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mSwipeRefreshLayout.setRefreshing(false);
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Toast.makeText(getApplicationContext(), getString(R.string.paging_finished_message), Toast.LENGTH_SHORT).show();
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break;
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case ERROR:
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retry();
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break;
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}
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}
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@Override
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protected void onError(DatabaseError databaseError) {
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mSwipeRefreshLayout.setRefreshing(false);
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Log.e(TAG, databaseError.getMessage());
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}
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};
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mRecycler.setLayoutManager(new LinearLayoutManager(this));
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mRecycler.setAdapter(mAdapter);
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// Reload data on swipe
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mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
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@Override
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public void onRefresh() {
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//Reload Data
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mAdapter.refresh();
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}
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});
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}
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public static class Post {
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@Nullable public String title;
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@Nullable public String body;
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public Post(){}
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public Post(@Nullable String title, @Nullable String body) {
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this.title = title;
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this.body = body;
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}
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}
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public static class PostViewHolder extends RecyclerView.ViewHolder {
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@BindView(R.id.textViewTitle)
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TextView mTitleView;
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@BindView(R.id.textViewBody)
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TextView mBodyView;
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PostViewHolder(@NonNull View itemView) {
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super(itemView);
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ButterKnife.bind(this, itemView);
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}
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void bind(@NonNull Post post) {
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mTitleView.setText(post.title);
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mBodyView.setText(post.body);
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}
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}
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}

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

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<?xml version="1.0" encoding="utf-8"?>
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<android.support.v4.widget.SwipeRefreshLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:id="@+id/swipe_refresh_layout"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:context="com.firebase.uidemo.database.realtime.FirebaseDbPagingActivity">
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<android.support.v7.widget.RecyclerView
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android:id="@+id/paging_recycler"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:layout_below="@+id/paging_loading"
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android:clipToPadding="false"
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android:paddingLeft="16dp"
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android:paddingTop="8dp"
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android:paddingRight="16dp"
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tools:listitem="@layout/item_post" />
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</android.support.v4.widget.SwipeRefreshLayout>

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

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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout 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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android:layout_width="match_parent"
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android:orientation="vertical"
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android:layout_height="wrap_content">
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<android.support.v7.widget.CardView
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:layout_marginLeft="4dp"
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android:layout_marginTop="2dp"
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android:layout_marginRight="4dp"
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android:layout_marginBottom="2dp"
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android:clickable="true"
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android:foreground="?android:selectableItemBackground"
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app:cardElevation="2dp"
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android:focusable="true">
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<LinearLayout
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:orientation="vertical"
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android:padding="8dp">
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<TextView
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android:id="@+id/textViewTitle"
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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/post_text_title"
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android:textColor="#000000"
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android:textSize="18sp"
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android:textStyle="bold" />
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<TextView
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android:id="@+id/textViewBody"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_margin="4dp"
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android:text="@string/post_text_body"
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android:textColor="#000000"
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android:textSize="15sp" />
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</LinearLayout>
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</android.support.v7.widget.CardView>
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</LinearLayout>

‎app/src/main/res/values/strings.xml‎

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<string name="title_firestore_activity">Cloud Firestore Demo</string>
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<string name="title_firestore_paging_activity">Cloud Firestore Paging Demo</string>
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<string name="title_realtime_database_activity">Real-time database demo</string>
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<string name="title_paging_database_activity">Paging database demo</string>
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<string name="title_storage_activity">Storage Image Demo</string>
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<string name="desc_auth">Demonstrates the Firebase Auth UI flow, with customization options.</string>
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<string name="desc_anonymous_upgrade">Demonstrates upgrading an anonymous account using FirebaseUI.</string>
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<string name="desc_firestore">Demonstrates using a FirestoreRecyclerAdapter to load data from Cloud Firestore into a RecyclerView for a basic chat app.</string>
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<string name="desc_firestore_paging">Demonstrates using a FirestorePagingAdapter to load/infinite scroll paged data from Cloud Firestore.</string>
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<string name="desc_realtime_database">Demonstrates using a FirebaseRecyclerAdapter to load data from Firebase Database into a RecyclerView for a basic chat app.</string>
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<string name="desc_paging_database">Demonstrates using a FirebaseRecyclerPagingAdapter to load/infinite scroll paged data from Firebase Database.</string>
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<string name="desc_storage">Demonstrates displaying an image from Cloud Storage using Glide.</string>
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<!-- Auth UI -->
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<string name="start_chatting">No messages. Start chatting at the bottom!</string>
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<string name="signing_in">Signing in…</string>
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<string name="signed_in">Signed In</string>
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<string name="post_text_title">Title</string>
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<string name="post_text_body">Body</string>
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<string name="anonymous_auth_failed_msg">
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Anonymous authentication failed, various components of the demo will not work.
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Make sure your device is online and that Anonymous Auth is configured in your Firebase project
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<string name="menu_add_data">Add Data</string>
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<string name="hint_message">Say something…</string>
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<string name="paging_finished_message">Reached End of List</string>
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</resources>

‎database/build.gradle.kts‎

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defaultConfig {
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testInstrumentationRunner = "android.support.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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named("release").configure {
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postprocessing {
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consumerProguardFiles("proguard-rules.pro")
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}
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}
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}
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}
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dependencies {
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api(Config.Libs.Support.v4)
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api(Config.Libs.Support.recyclerView)
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compileOnly(Config.Libs.Arch.paging)
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annotationProcessor(Config.Libs.Arch.compiler)
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androidTestImplementation(Config.Libs.Test.junit)

‎database/proguard-rules.pro‎

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-dontwarn com.firebase.ui.database.paging.**

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