firebase
어떻게 RecyclerAdapter 대신 FirebaseRecyclerAdapter를 사용합니까?

다음은 FirebaseUi 구성 요소 사용 예제 FirebaseRecyclerAdapter입니다.

안녕하세요 친구 시작 코드 전에 우리는 액세스 firebase UI 구성 요소에 대한 의존성을 선언해야합니다, 그래서 여기에 당신이 당신이 병아리로 종속성을 추가 할 수있는 다른 현명한 다른 gradel에 넣을 수있는 종속성입니다.

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

그런 다음 아래와 같이 firebase 데이터베이스에서 데이터를 쿼리 한 후

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

그런 다음 FirebaseRecyclerAdapter 내부에서 다음과 같은 쿼리를 전달한 후

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 (모델 클래스)

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 (리사이클 러 뷰의 행 레이아웃)

<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>