Решил написать чат для Android, начал изучать по вот этому курсу (
https://www.youtube.com/watch?v=gFtajvZajrg&t=1718s), но в нем рассматривается устаревшая версия FireBase.
Проблема в том, что я настроил БД и если в чате написать и отправить сообщение то в БД оно попадает, но визуально в приложении его нет, как решить подскажите пожалуйста.
В Logcat ошибка "2020-08-28 20:25:06.677 22284-22284/com.example.chatapp E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length"
MainActivity.java
package com.example.chatapp;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.firebase.ui.auth.AuthUI;
import com.firebase.ui.database.FirebaseListAdapter;
import com.firebase.ui.database.FirebaseListOptions;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import android.text.format.DateFormat;
import org.w3c.dom.Text;
public class MainActivity extends AppCompatActivity {
private static int SING_IN_CODE = 1;
private RelativeLayout activity_main;
private FirebaseListAdapter<Message> adapter;
private FloatingActionButton sendBtn;
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SING_IN_CODE) {
if (resultCode == RESULT_OK) {
Snackbar.make(activity_main, "Вы авторизованы", Snackbar.LENGTH_LONG).show();
displayAllMessages();
} else {
Snackbar.make(activity_main, "Вы не авторизованы", Snackbar.LENGTH_LONG).show();
finish();
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
activity_main = findViewById(R.id.activity_main);
sendBtn = findViewById(R.id.btnSend);
sendBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
EditText textField = findViewById(R.id.messageField);
if (textField.getText().toString() == "")
return;
FirebaseDatabase.getInstance().getReference().push().setValue(
new Message(
FirebaseAuth.getInstance().getCurrentUser().getEmail(),
textField.getText().toString()
)
);
textField.setText("");
}
});
//Пользователь не авторизован
if (FirebaseAuth.getInstance().getCurrentUser() == null)
startActivityForResult(AuthUI.getInstance().createSignInIntentBuilder().build(), SING_IN_CODE);
else {
Snackbar.make(activity_main, "Вы авторизованы", Snackbar.LENGTH_LONG).show();
displayAllMessages();
}
}
private void displayAllMessages() {
ListView listOfMessage = findViewById(R.id.list_of_messages);
Query query = FirebaseDatabase.getInstance().getReference().child("Message");
FirebaseListOptions<Message> options =
new FirebaseListOptions.Builder<Message>()
.setQuery(query ,Message.class)
.setLayout(R.layout.list_item)
.build();
adapter = new FirebaseListAdapter<Message>(options) {
@Override
protected void populateView(@NonNull View v, @NonNull Message model, int position) {
TextView mess_user, mess_time, mess_text;
mess_user = v.findViewById(R.id.message_user);
mess_time = v.findViewById(R.id.message_time);
mess_text = v.findViewById(R.id.message_text);
mess_user.setText(model.getUserName());
mess_text.setText(model.getTextMessage());
mess_time.setText(DateFormat.format("dd-mm-yyyy HH:mm:ss", model.getMessageTime()));
}
};
listOfMessage.setAdapter(adapter);
}
}
Message.java
package com.example.chatapp;
import java.util.Date;
public class Message {
public String userName;
public String textMessage;
private long messageTime;
public Message() {}
public Message(String userName, String textMessage) {
this.userName = userName;
this.textMessage = textMessage;
this.messageTime = new Date().getTime();
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getTextMessage() {
return textMessage;
}
public void setTextMessage(String textMessage) {
this.textMessage = textMessage;
}
public long getMessageTime() {
return messageTime;
}
public void setMessageTime(long messageTime) {
this.messageTime = messageTime;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:id="@+id/activity_main">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/btnSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:src='@drawable/ic_send_button'
android:tint="@android:color/white"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_margin="25dp"
/>
<com.google.android.material.textfield.TextInputLayout
android:id="@+id/text_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:layout_toStartOf="@id/btnSend"
>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/messageField"
android:hint=" Введите сообщение"/>
</com.google.android.material.textfield.TextInputLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/text_layout"
android:id="@+id/list_of_messages"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:divider="@android:color/transparent"
android:dividerHeight="16dp"
android:layout_marginBottom="16dp"/>
</RelativeLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:id="@+id/message_user"
android:textStyle="normal|bold"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:id="@+id/message_time"
/>
<TextView
android:id="@+id/message_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/message_user"
android:layout_alignParentStart="true"
android:layout_marginTop="5dp"
android:textAppearance="@style/TextAppearance.AppCompat.Medium"
android:textSize="18sp" />
</RelativeLayout>