我有以下代碼:問題與文本框
public class Chat_Room extends AppCompatActivity {
private Button btn_send_msg;
private EditText input_msg;
private TextView chat_conversation;
private String user_name,room_name;
private DatabaseReference root;
private String temp_key;
private String str;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.chat_room);
btn_send_msg = (Button) findViewById(R.id.button13);
input_msg = (EditText) findViewById(R.id.editText3);
chat_conversation = (TextView) findViewById(R.id.textView4);
user_name = getIntent().getExtras().get("user_name").toString();
room_name = getIntent().getExtras().get("room_name").toString();
setTitle("Chat Room - " + room_name);
root = FirebaseDatabase.getInstance().getReference().child(room_name);
str=input_msg.getText().toString().trim();
btn_send_msg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(str != null && !str.isEmpty()){
Map<String, Object> map = new HashMap<String, Object>();
temp_key = root.push().getKey();
root.updateChildren(map);
DatabaseReference message_root = root.child(temp_key);
Map<String, Object> map2 = new HashMap<String, Object>();
map2.put("name", user_name);
map2.put("msg", input_msg.getText().toString());
message_root.updateChildren(map2);
input_msg.setText("");
}else{
/// show the error msg to the user
Toast.makeText(Chat_Room.this, "Please enter the message",Toast.LENGTH_LONG).show();
}
}
});
root.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
append_chat_conversation(dataSnapshot);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
append_chat_conversation(dataSnapshot);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private String chat_msg,chat_user_name;
private void append_chat_conversation(DataSnapshot dataSnapshot) {
Iterator i = dataSnapshot.getChildren().iterator();
while (i.hasNext()){
chat_msg = (String) ((DataSnapshot)i.next()).getValue();
chat_user_name = (String) ((DataSnapshot)i.next()).getValue();
chat_conversation.append(chat_user_name + " - " + chat_msg + "\n");
}
}
}
我試圖輸出一個錯誤,當用戶未在文本框中鍵入文本,但在它的文字,但它仍然發送錯誤信息。 所以基本上,我能夠創建我想要的錯誤,以便當聊天室中按下按鈕發送空白消息時,它會響應一個錯誤。但是,即使在文本框中輸入內容並嘗試發送它時,它也會以相同的錯誤進行響應,並且不會發送該消息。所以請你幫忙!
我通常不知道很多關於Android,但只設置了str的值在onCreate方法。不應該在你的onClick方法中使用'str = input_msg.getText()。toString()。trim(),以便它在每次點擊時讀取字符串,而不是隻創建一次? –
@ 911DidBush我想我在答案中提供了相同的信息。 –