以下是使用 FirebaseUi 组件 FirebaseRecyclerAdapter 的示例
你好朋友在开始代码之前我们需要声明访问 firebase ui 组件的依赖关系，所以这里是你可以把它放在你的 gradel 中的依赖关系，否则你也可以添加依赖关系作为 jar。
compile 'com.firebaseui:firebase-ui-database:0.4.0'
然后我们在 firebase 数据库中查询以下方式的数据
DatabaseReference databaseReference = database.getReference().child("users");
Query query = databaseReference.limitToFirst(50);
然后我们在 FirebaseRecyclerAdapter 中传递查询，如下所示
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（模型类）
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（回收站视图中行的布局）
<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>