firebase
Wie verwende ich FirebaseRecyclerAdapter anstelle von RecyclerAdapter?

Hier ist das Beispiel für die Verwendung der FirebaseUi-Komponente FirebaseRecyclerAdapter

Hallo Freunde, vor dem Startcode müssen wir die Abhängigkeit für die Access-Firebase-Komponente "UI" angeben. Daher ist hier die Abhängigkeit, die Sie in Ihren Gradel aufnehmen können. Andernfalls können Sie die Abhängigkeit auch als jar hinzufügen.

compile 'com.firebaseui:firebase-ui-database:0.4.0'

Dann, nachdem wir in der Firebase-Datenbank nach Daten gefragt haben, wie folgt

DatabaseReference databaseReference = database.getReference().child("users");
Query query = databaseReference.limitToFirst(50); 

Dann, nachdem wir die Abfrage in FirebaseRecyclerAdapter wie folgt übergeben haben

private void setUpFirebaseAdapter(Query query) {

        mFirebaseAdapter = new FirebaseRecyclerAdapter<UserModel, FirebaseUserViewHolder>
                (UserModel.class, R.layout.row_user_list, FirebaseUserViewHolder.class, query) {
            @Override
            protected void populateViewHolder(FirebaseUserViewHolder viewHolder, UserModel model, int position) {
                customeLoaderDialog.hide();
                viewHolder.bindUser(model);
            }
        };

        my_recycler_view.setHasFixedSize(true);
        my_recycler_view.setLayoutManager(new LinearLayoutManager(this));
        my_recycler_view.setAdapter(mFirebaseAdapter);

    }

ChatUserModel.java (Modellklasse)

public class ChatUserModel {
private long badge;
private String chat_id;
private String isDelete;
private String latestactivity;
private double timestamp;
private String user_id;
private String profilePic;
private String displayName;
private boolean isGroup;
String groupId;
private String creatorId;

public String getGroupId() {
    return groupId;
}

public void setGroupId(String groupId) {
    this.groupId = groupId;
}

public String getCreatorId() {
    return creatorId;
}

public void setCreatorId(String creatorId) {
    this.creatorId = creatorId;
}

public boolean isGroup() {
    return isGroup;
}

public void setGroup(boolean group) {
    isGroup = group;
}


public ChatUserModel() {

}

public long getBadge() {
    return badge;
}

public void setBadge(long badge) {
    this.badge = badge;
}

public String getChat_id() {
    return chat_id;
}

public void setChat_id(String chat_id) {
    this.chat_id = chat_id;
}

public String getIsDelete() {
    return isDelete;
}

public void setIsDelete(String isDelete) {
    this.isDelete = isDelete;
}

public String getLatestactivity() {
    return latestactivity;
}

public void setLatestactivity(String latestactivity) {
    this.latestactivity = latestactivity;
}

public double getTimestamp() {
    return timestamp;
}

public void setTimestamp(double timestamp) {
    this.timestamp = timestamp;
}

public String getUser_id() {
    return user_id;
}

public void setUser_id(String user_id) {
    this.user_id = user_id;
}

public String getProfilePic() {
    return profilePic;
}

public void setProfilePic(String profilePic) {
    this.profilePic = profilePic;
}

public String getDisplayName() {
    return displayName;
}

public void setDisplayName(String displayName) {
    this.displayName = displayName;
}}

FirebaseChatUserViewHolder.java (Recycler ViewHolder)

public class FirebaseChatUserViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    private static final int MAX_WIDTH = 200;
    private static final int MAX_HEIGHT = 200;
    View mView;
    Context mContext;
    ChatUserModel userModel;

    public FirebaseChatUserViewHolder(View itemView) {
        super(itemView);
        mView = itemView;
        mContext = itemView.getContext();
        itemView.setOnClickListener(this);
    }

    public void bindUser(ChatUserModel userModel) {
        this.userModel = userModel;
        ImageView imgUser = (ImageView) mView.findViewById(R.id.imgUser);
        TextView tvName = (TextView) mView.findViewById(R.id.tvName);
        TextView tvStatus = (TextView) mView.findViewById(R.id.tvStatus);
        BadgeView badgeChat = (BadgeView) mView.findViewById(R.id.badgeChat);
        if (userModel.isGroup()) {
           // imgUser.setImageDrawable(mContext.getResources().getDrawable(R.drawable.create_group));
        } else {
            Picasso.with(mContext)
                    .load(userModel.getProfilePic())
                    .resize(MAX_WIDTH, MAX_HEIGHT)
                    .centerCrop()
                    .into(imgUser);
        }

        tvName.setText(userModel.getDisplayName());
        tvStatus.setText(userModel.getLatestactivity());
        if (userModel.getBadge() > 0) {
            badgeChat.setVisibility(View.VISIBLE);
            badgeChat.setText("" + userModel.getBadge());
        } else {
            badgeChat.setVisibility(View.GONE);
        }

    }

    @Override
    public void onClick(View view) {
        if (!userModel.isGroup()) {
            Intent intent = new Intent(mContext, ChatConverstion.class);
            intent.putExtra("chat_id", "" + userModel.getChat_id());
            intent.putExtra("reciverUserName", "" + userModel.getDisplayName());
            intent.putExtra("reciverProfilePic", "" + userModel.getProfilePic());
            intent.putExtra("reciverUid", "" + userModel.getUser_id());
            mContext.startActivity(intent);
        }
    }
}

row_user_list.xml (Layout für Zeile in Recycler-Ansicht)

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:orientation="horizontal"
   >

    <LinearLayout
        android:gravity="center_vertical"
        android:layout_width="match_parent"
        android:id="@+id/llMainChat"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingTop="@dimen/margin_small"
        android:paddingLeft="@dimen/margin_small"
        android:paddingBottom="@dimen/margin_small"
        android:paddingRight="@dimen/margin_small"
        >

        <com.tristate.firebasechat.custome_view.CircleImageView
            android:id="@+id/imgUser"
            android:layout_width="@dimen/tab_top_height"
            android:layout_height="@dimen/tab_top_height"

            app:civ_border_color="@color/dark_white"
            app:civ_border_width="2dp" />

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_marginLeft="@dimen/margin_medium"
         >

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                android:layout_toLeftOf="@+id/badgeChat"
                android:layout_toStartOf="@+id/badgeChat"
                android:id="@+id/linearLayout">

                <TextView
                    android:id="@+id/tvName"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:ellipsize="marquee"
                    android:singleLine="true"
                    android:text="Dhaval Solanki"
                    android:textSize="@dimen/textsize_midle" />

                <TextView
                    android:id="@+id/tvStatus"
                    android:ems="3"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center_vertical"
                    android:lines="1"
                    android:text="Online"
                    android:textColor="@color/greenStatusBar"
                    android:textSize="@dimen/textsize_small" />
            </LinearLayout>
            <com.tristate.firebasechat.custome_view.BadgeView
                android:id="@+id/badgeChat"
                android:layout_width="@dimen/margin_very_big"
                android:layout_height="@dimen/margin_very_big"
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"
                android:background="@drawable/badge_bg"
                android:gravity="center"
                android:padding="@dimen/corner_radius"
                android:text="999"
                android:textColor="@color/white"
                android:textSize="@dimen/textsize_verysmall"
                android:visibility="gone" />


        </RelativeLayout>


    </LinearLayout>
    <View
        android:layout_alignBottom="@id/llMainChat"
        android:layout_marginTop="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:layout_marginRight="@dimen/margin_small"
        android:layout_width="match_parent"
        android:background="@color/avatar_back_color"
        android:layout_height="1dp"
        ></View>
</RelativeLayout>