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Add pull-to-loadmore more to RecyclerViewDemoActivity. #7

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Add pull-to-loadmore more to RecyclerViewDemoActivity. #7

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0f4de1d
Add pull-to-request more to RecyclerViewDemoActivity.
htcbug Aug 25, 2015
9575741
Use longer lists of messages
puf Aug 31, 2015
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2 changes: 1 addition & 1 deletion app/app.iml
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Original file line number Diff line number Diff line change
Expand Up @@ -98,8 +98,8 @@
<orderEntry type="library" exported="" name="recyclerview-v7-22.2.1" level="project" />
<orderEntry type="library" exported="" name="tubesock-0.0.11" level="project" />
<orderEntry type="library" exported="" name="jackson-annotations-2.2.2" level="project" />
<orderEntry type="library" exported="" name="firebase-client-android-2.3.1" level="project" />
<orderEntry type="library" exported="" name="support-annotations-22.2.1" level="project" />
<orderEntry type="library" exported="" name="firebase-client-android-2.3.1" level="project" />
<orderEntry type="library" exported="" name="appcompat-v7-22.2.0" level="project" />
<orderEntry type="module" module-name="library" exported="" />
</component>
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79 changes: 52 additions & 27 deletions app/src/main/java/com/firebase/uidemo/RecyclerViewDemoActivity.java
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Original file line number Diff line number Diff line change
@@ -1,12 +1,10 @@
package com.firebase.uidemo;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
Expand All @@ -18,19 +16,27 @@


public class RecyclerViewDemoActivity extends AppCompatActivity {

private static final int INITIAL_LOAD_COUNT = 15;
private static final int INCREMENTAL_LOAD_COUNT = 15;
private static final int PREFETCH_THRESHOLD = 5;

private int mLastLimitCount;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recycler_view_demo);

final Firebase ref = new Firebase("https://nanochat.firebaseio.com");
final Firebase ref = new Firebase("https://firebaseui.firebaseio.com/largechat");

final String name = "Android User";
final Button sendButton = (Button) findViewById(R.id.sendButton);
final EditText messageEdit = (EditText) findViewById(R.id.messageEdit);
final RecyclerView messages = (RecyclerView) findViewById(R.id.messagesList);
final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
messages.setHasFixedSize(true);
messages.setLayoutManager(new LinearLayoutManager(this));
messages.setLayoutManager(layoutManager);

sendButton.setOnClickListener(new View.OnClickListener() {
@Override
Expand All @@ -41,50 +47,69 @@ public void onClick(View v) {
}
});

FirebaseRecyclerViewAdapter<Chat, ChatHolder> adapter = new FirebaseRecyclerViewAdapter<Chat, ChatHolder>(Chat.class, android.R.layout.two_line_list_item, ChatHolder.class, ref) {
mLastLimitCount = INITIAL_LOAD_COUNT;
final FirebaseRecyclerViewAdapter<Chat, ChatHolder> adapter =
new FirebaseRecyclerViewAdapter<Chat, ChatHolder>(Chat.class,
android.R.layout.two_line_list_item, ChatHolder.class,
ref.orderByKey().limitToLast(mLastLimitCount)) {
@Override
public void populateViewHolder(ChatHolder chatView, Chat chat) {
chatView.messageText.setText(chat.getText());
chatView.messageText.setPadding(10, 0, 10, 0);
chatView.nameText.setText(chat.getName());
chatView.nameText.setPadding(10, 0, 10, 15);
if (chat.getName().equals(name)) {
chatView.messageText.setGravity(Gravity.END);
chatView.nameText.setGravity(Gravity.END);
chatView.nameText.setTextColor(Color.parseColor("#8BC34A"));
} else {
chatView.nameText.setTextColor(Color.parseColor("#00BCD4"));
}
}
};

messages.setAdapter(adapter);

messages.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void populateViewHolder(ChatHolder chatView, Chat chat) {
chatView.messageText.setText(chat.getMessage());
chatView.messageText.setPadding(10, 0, 10, 0);
chatView.nameText.setText(chat.getName());
chatView.nameText.setPadding(10, 0, 10, 15);
if (chat.getName().equals(name)) {
chatView.messageText.setGravity(Gravity.END);
chatView.nameText.setGravity(Gravity.END);
chatView.nameText.setTextColor(Color.parseColor("#8BC34A"));
} else {
chatView.nameText.setTextColor(Color.parseColor("#00BCD4"));
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
boolean isScrollingUp = dy < 0;
boolean shouldPrefetch =
layoutManager.findFirstVisibleItemPosition() < PREFETCH_THRESHOLD;

if (isScrollingUp && shouldPrefetch) {
if (shouldPrefetch) {
mLastLimitCount += INCREMENTAL_LOAD_COUNT;
adapter.updateQuery(ref.orderByKey().limitToLast(mLastLimitCount));
}
}
}
};

messages.setAdapter(adapter);
});

}


static class Chat {
public static class Chat {
String name;
String message;
String text;

public Chat() {
}

public Chat(String name, String message) {
public Chat(String name, String text) {
this.name = name;
this.message = message;
this.text = text;
}

public String getName() {
return name;
}

public String getMessage() {
return message;
public String getText() {
return text;
}
}

static class ChatHolder extends RecyclerView.ViewHolder {
public static class ChatHolder extends RecyclerView.ViewHolder {
TextView nameText, messageText;

public ChatHolder(View itemView) {
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13 changes: 13 additions & 0 deletions library/src/main/java/com/firebase/ui/FirebaseArray.java
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,12 @@ public FirebaseArray(Query ref) {
mQuery.addChildEventListener(this);
}

public void updateQuery(Query ref) {
mQuery.removeEventListener(this);
mQuery = ref;
mQuery.addChildEventListener(this);
}

public void cleanup() {
mQuery.removeEventListener(this);
}
Expand Down Expand Up @@ -82,6 +88,11 @@ public void onChildAdded(DataSnapshot snapshot, String previousChildKey) {
if (previousChildKey != null) {
index = getIndexForKey(previousChildKey) + 1;
}
if (mSnapshots.size() >= (index + 1)
&& mSnapshots.get(index).getKey().equals(snapshot.getKey())) {
return;
}

mSnapshots.add(index, snapshot);
notifyChangedListeners(OnChangedListener.EventType.Added, index);
}
Expand Down Expand Up @@ -114,9 +125,11 @@ public void onCancelled(FirebaseError firebaseError) {
public void setOnChangedListener(OnChangedListener listener) {
mListener = listener;
}

protected void notifyChangedListeners(OnChangedListener.EventType type, int index) {
notifyChangedListeners(type, index, -1);
}

protected void notifyChangedListeners(OnChangedListener.EventType type, int index, int oldIndex) {
if (mListener != null) {
mListener.onChanged(type, index, oldIndex);
Expand Down
8 changes: 6 additions & 2 deletions library/src/main/java/com/firebase/ui/FirebaseRecyclerViewAdapter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
package com.firebase.ui;

import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
Expand Down Expand Up @@ -133,7 +134,7 @@ public void onChanged(EventType type, int index, int oldIndex) {
* combination of <code>limit()</code>, <code>startAt()</code>, and <code>endAt()</code>
*/
public FirebaseRecyclerViewAdapter(Class<T> modelClass, int modelLayout, Class<VH> viewHolderClass, Firebase ref) {
this(modelClass, modelLayout, viewHolderClass, (Query)ref);
this(modelClass, modelLayout, viewHolderClass, (Query) ref);
}


Expand Down Expand Up @@ -180,6 +181,9 @@ public void onBindViewHolder(VH viewHolder, int i) {
populateViewHolder(viewHolder, model);
}

abstract public void populateViewHolder(VH viewHolder, T model);
public void updateQuery(Query query) {
mSnapshots.updateQuery(query);
}

abstract public void populateViewHolder(VH viewHolder, T model);
}