我在 build.gradle 中使用了以下依赖项:
compile 'com.google.firebase:firebase-database:11.4.2'
compile 'com.firebaseui:firebase-ui-database:3.1.0'
compile 'com.firebaseui:firebase-ui-auth:3.1.0'
我的目标是使用来自 Firebase 数据库的数据填充 Listview
。
我正在按照 Github Firebase 上的指南进行操作
以下方法应将数据绑定(bind)到 ListView :
private void showMessages() {
Query query = FirebaseDatabase.getInstance()
.getReference("notfication/unread/" + userMailAddress.replace(".", ","))
.orderByKey();
FirebaseListOptions<Message> options = new FirebaseListOptions.Builder<Message>()
.setLayout(R.layout.fbmessage_listitem)//Note: The guide doesn't mention this method, without it an exception is thrown that the layout has to be set.
.setQuery(query, Message.class)
.build();
FirebaseListAdapter<Message> adapter = new FirebaseListAdapter<Message>(options) {
@Override
protected void populateView(View v, Message model, int position) {
TextView tvMessage = v.findViewById(R.id.tv_message);
tvMessage.setText(model.getDateTimeCreated());
}
};
ListView readMessageList = findViewById(R.id.lvReadMessageList);
readMessageList.setAdapter(adapter);
}
这是包含 TextView 的布局。
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="0.6" android:orientation="vertical"> <TextView android:id="@+id/tv_created_on" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="start" android:gravity="start" android:paddingStart="5dp" android:paddingEnd="0dp" android:textColor="@android:color/black" /> <TextView android:id="@+id/tv_message" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="start" android:gravity="start" android:paddingStart="5dp" android:paddingEnd="0dp" android:textColor="@android:color/black" /> </LinearLayout> <ImageView android:id="@+id/iv_message_read" android:layout_width="200dp" android:layout_height="30dp" android:layout_weight="0.2" android:contentDescription="@string/message_read" android:elevation="2dp" app:srcCompat="@drawable/android_ok_sign" /> <ImageView android:id="@+id/iv_delete" android:layout_width="200dp" android:layout_height="30dp" android:layout_weight="0.2" android:contentDescription="@string/abc_delete" android:elevation="2dp" android:src="@drawable/ic_delete_red_48dp" />
模型:
public class Message {
private String message;
private String sender;
private String receiver;
private long timestamp;
private boolean isRead;
private String userMailAddress;
public Message() {
}
public Message(String message, String sender, String receiver, long timestamp, boolean isRead) {
this.message = message;
this.sender = sender;
this.receiver = receiver;
this.timestamp = timestamp;
this.isRead = isRead;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public String getSender() {
return sender;
}
public void setSender(String sender) {
this.sender = sender;
}
public String getReceiver() {
return receiver;
}
public void setReceiver(String receiver) {
this.receiver = receiver;
}
public long getTimestamp() {
return timestamp;
}
public void setTimestamp(long timestamp) {
this.timestamp = timestamp;
}
public boolean isRead() {
return isRead;
}
public void setRead(boolean read) {
isRead = read;
}
public String getUserMailAddress() {
return userMailAddress;
}
public void setUserMailAddress(String userMailAddress) {
this.userMailAddress = userMailAddress;
}
public String getDateTimeCreated() {
Calendar calendar = Calendar.getInstance(Locale.getDefault());
calendar.setTimeInMillis(timestamp);
String date = DateFormat.format("dd-MM-yyyy", calendar).toString();
String time = DateFormat.format("HH:mm", calendar).toString();
return date + "\r\n" + time;
}
}
无论我尝试什么,设置断点或记录标签,都不会调用将数据从模型绑定(bind)到文本字段的方法 populateView。 我在之前的 FirebaseUI 中使用了相同的布局(仍在我的生产应用中),并且一切正常。
有谁知道为什么不调用覆盖方法 populateView?
最佳答案
我遇到了同样的问题,解决了:
@Override
protected void onStart() {
super.onStart();
mAdapter.startListening();
}
然后
@Override
protected void onStop() {
super.onStop();
mAdapter.stopListening();
}
像更新前一样工作:-)
关于Android 使用带有 FirebaseListOptions 的 FirebaseUI 来填充 ListView 不会调用 populateView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46912532/