将TextView值链接到firebase数据库ID

dependencies {
    implementation 'com.google.firebase:firebase-database:20.0.3'
}

FirebaseDatabase database = FirebaseDatabase.getInstance();

TextView textView = findViewById(R.id.textView);
String textValue = textView.getText().toString();

// 获取一个DatabaseReference对象
DatabaseReference myRef = database.getReference("messages");

// 生成一个唯一的ID
String id = myRef.push().getKey();

// 将数据保存到Firebase
myRef.child(id).setValue(textValue);

myRef.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String value = dataSnapshot.getValue(String.class);
        textView.setText(value);
    }

    @Override
    public void onCancelled(DatabaseError error) {
        // 处理错误情况
    }
});

{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null"
  }
}