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Add sample for RecyclerView
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‎ParseUI-Widget-Sample/build.gradle‎

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@@ -21,6 +21,7 @@ android {
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dependencies {
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compile 'com.android.support:appcompat-v7:23.1.1'
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compile 'com.android.support:recyclerview-v7:23.1.0'
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compile project(':ParseUI-Widget')
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testCompile 'junit:junit:4.12'

‎ParseUI-Widget-Sample/src/main/AndroidManifest.xml‎

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</intent-filter>
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</activity>
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<activity
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android:name=".RecyclerActivity"
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android:label="@string/recycler_name"/>
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<activity
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android:name=".ListActivity"
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android:label="@string/list_name"/>

‎ParseUI-Widget-Sample/src/main/java/com/parse/ui/widget/sample/MainActivity.java‎

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@@ -12,6 +12,7 @@ protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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findViewById(R.id.sample_recycler).setOnClickListener(this);
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findViewById(R.id.sample_list).setOnClickListener(this);
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}
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@@ -21,6 +22,11 @@ protected void onCreate(Bundle savedInstanceState) {
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public void onClick(View v) {
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int id = v.getId();
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switch (id) {
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case R.id.sample_recycler: {
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Intent intent = new Intent(this, RecyclerActivity.class);
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startActivity(intent);
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break;
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}
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case R.id.sample_list: {
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Intent intent = new Intent(this, ListActivity.class);
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startActivity(intent);

‎ParseUI-Widget-Sample/src/main/java/com/parse/ui/widget/sample/RecyclerActivity.java‎

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package com.parse.ui.widget.sample;
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import android.os.Bundle;
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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.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.ProgressBar;
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import android.widget.TextView;
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import com.parse.ParseObject;
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import com.parse.ParseQuery;
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import com.parse.widget.util.ParseQueryPager;
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import java.util.List;
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import bolts.CancellationTokenSource;
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import bolts.Continuation;
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import bolts.Task;
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public class RecyclerActivity extends AppCompatActivity {
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private SwipeRefreshLayout refreshLayout;
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private MyAdapter<ParseObject> adapter;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_recycler);
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RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler);
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RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
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recyclerView.setLayoutManager(layoutManager);
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adapter = new MyAdapter<>(createPager());
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recyclerView.setAdapter(adapter);
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refreshLayout = (SwipeRefreshLayout) findViewById(R.id.refresh);
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refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
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@Override
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public void onRefresh() {
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final ParseQueryPager<ParseObject> pager = createPager();
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pager.loadNextPage().continueWith(new Continuation<List<ParseObject>, Void>() {
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@Override
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public Void then(Task<List<ParseObject>> task) throws Exception {
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refreshLayout.setRefreshing(false);
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if (task.isCancelled()) {
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return null;
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}
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if (task.isFaulted()) {
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return null;
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}
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adapter.swap(pager);
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adapter.notifyDataSetChanged();
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return null;
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}
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}, Task.UI_THREAD_EXECUTOR);
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}
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});
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}
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private ParseQueryPager<ParseObject> createPager() {
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ParseQuery<ParseObject> query = ParseQuery.getQuery("TestObject");
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query.orderByAscending("name");
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return new ParseQueryPager<>(query, 25);
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}
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public static class MyAdapter<T extends ParseObject> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
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private static final int TYPE_ITEM = 0;
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private static final int TYPE_NEXT = 1;
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private static class ItemViewHolder extends RecyclerView.ViewHolder {
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TextView textView;
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public ItemViewHolder(View itemView) {
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super(itemView);
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textView = (TextView) itemView;
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}
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}
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private static class NextViewHolder extends RecyclerView.ViewHolder {
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TextView textView;
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ProgressBar progressBar;
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public NextViewHolder(View itemView) {
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super(itemView);
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textView = (TextView) itemView.findViewById(android.R.id.text1);
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progressBar = (ProgressBar) itemView.findViewById(android.R.id.progress);
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}
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public void setLoading(boolean loading) {
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if (loading) {
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textView.setVisibility(View.INVISIBLE);
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progressBar.setVisibility(View.VISIBLE);
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progressBar.setIndeterminate(true);
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} else {
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textView.setVisibility(View.VISIBLE);
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progressBar.setVisibility(View.INVISIBLE);
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progressBar.setIndeterminate(false);
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}
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}
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}
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private final Object lock = new Object();
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private ParseQueryPager<T> pager;
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private CancellationTokenSource cts;
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public MyAdapter(ParseQueryPager<T> pager) {
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swap(pager);
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}
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public ParseQueryPager<T> getPager() {
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synchronized (lock) {
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return pager;
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}
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}
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public void swap(ParseQueryPager<T> pager) {
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synchronized (lock) {
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if (cts != null) {
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cts.cancel();
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}
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this.pager = pager;
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this.cts = new CancellationTokenSource();
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}
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}
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private void loadNextPage() {
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final ParseQueryPager<T> pager;
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final CancellationTokenSource cts;
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synchronized (lock) {
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pager = this.pager;
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cts = this.cts;
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}
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final int oldSize = pager.getObjects().size();
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// Uses Tasks, so it does not support CACHE_THEN_NETWORK. See ListActivity for a sample
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// with callbacks.
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pager.loadNextPage(cts.getToken()).continueWith(new Continuation<List<T>, Task<Void>>() {
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@Override
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public Task<Void> then(Task<List<T>> task) throws Exception {
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if (task.isCancelled()) {
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return null;
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}
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if (task.isFaulted()) {
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notifyDataSetChanged();
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return null;
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}
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// Remove "Load more..."
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notifyItemRemoved(oldSize);
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// Insert results
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List<T> results = task.getResult();
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if (results.size() > 0) {
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notifyItemRangeInserted(oldSize, results.size());
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}
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if (pager.hasNextPage()) {
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// Add "Load more..."
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notifyItemInserted(pager.getObjects().size());
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}
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return null;
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}
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});
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notifyItemChanged(oldSize);
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}
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@Override
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public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
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LayoutInflater inflater = LayoutInflater.from(parent.getContext());
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switch (viewType) {
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case TYPE_ITEM: {
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View v = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);
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return new ItemViewHolder(v);
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}
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case TYPE_NEXT: {
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View v = inflater.inflate(R.layout.load_more_list_item, parent, false);
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v.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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if (!getPager().isLoadingNextPage()) {
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loadNextPage();
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}
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}
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});
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NextViewHolder vh = new NextViewHolder(v);
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vh.textView.setText(R.string.load_more);
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return vh;
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}
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default:
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throw new IllegalStateException("Invalid view type: " + viewType);
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}
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}
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@Override
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public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
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switch (getItemViewType(position)) {
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case TYPE_ITEM: {
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ParseObject item = getPager().getObjects().get(position);
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ItemViewHolder vh = (ItemViewHolder) holder;
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vh.textView.setText(item.getString("name"));
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}
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break;
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case TYPE_NEXT: {
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NextViewHolder vh = (NextViewHolder) holder;
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vh.setLoading(getPager().isLoadingNextPage());
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}
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break;
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}
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}
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@Override
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public int getItemCount() {
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ParseQueryPager<T> pager = getPager();
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return pager.getObjects().size() + (pager.hasNextPage() ? 1 : 0);
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}
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@Override
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public int getItemViewType(int position) {
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return position < getPager().getObjects().size() ? TYPE_ITEM : TYPE_NEXT;
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}
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@Override
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public void registerAdapterDataObserver(RecyclerView.AdapterDataObserver observer) {
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super.registerAdapterDataObserver(observer);
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// We use this method as a notification that the RecyclerView is bound to the adapter.
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loadNextPage();
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}
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}
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}

‎ParseUI-Widget-Sample/src/main/res/layout/activity_main.xml‎

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android:orientation="vertical"
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tools:context="com.parse.ui.widget.sample.MainActivity">
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<Button
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android:id="@+id/sample_recycler"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:text="@string/recycler_name"/>
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<Button
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android:id="@+id/sample_list"
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android:layout_width="match_parent"

‎ParseUI-Widget-Sample/src/main/res/layout/activity_recycler.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="vertical"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<android.support.v4.widget.SwipeRefreshLayout
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android:id="@+id/refresh"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<android.support.v7.widget.RecyclerView
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android:id="@+id/recycler"
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android:layout_width="match_parent"
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android:layout_height="match_parent"/>
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</android.support.v4.widget.SwipeRefreshLayout>
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</FrameLayout>

‎ParseUI-Widget-Sample/src/main/res/values/strings.xml‎

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<resources>
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<string name="app_name">ParseUI-Widget Sample</string>
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<string name="recycler_name">RecyclerView Sample</string>
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<string name="list_name">ListView Sample</string>
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<string name="load_more">Load more…</string>

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