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/