我正在使用Firebase作为数据库开发聊天应用。 在应用程序中我有3个活动：LoginActivity，MainActivity和chatActivity。 在MainActivity中，我可以打开聊天室，然后进入聊天室。 然后它打开chatActivity。 在聊天活动中，用户可以相互发送消息。在这里我的问题是。当用户键入消息并按发送时。出于某种原因，当用户按下SEND按钮时，它会跳转到mainActivity inst并发送消息。我不知道最新情况，我需要你的帮助。
主要活动代码
package com.world.bolandian.firebase;
public class MainActivity extends AppCompatActivity {
private Button createChat;
private EditText chatRoomName;
private ListView listView;
private ArrayAdapter<String> arrayAdapter;
private ArrayList<String> listOfChats = new ArrayList<>();
private String name;
private DatabaseReference root = FirebaseDatabase.getInstance().getReference().getRoot();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ifUserIsLoggedIn();
createChat = (Button)findViewById(R.id.createChatBtn);
chatRoomName = (EditText)findViewById(R.id.chatRoomEt);
listView = (ListView)findViewById(R.id.listView);
arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line, listOfChats);
listView.setAdapter(arrayAdapter);
enterUserName();
createChat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Map<String, Object> map = new HashMap<String, Object>();
map.put(chatRoomName.getText().toString(), "");
root.updateChildren(map);
}
});
root.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Set<String> set = new HashSet<String>();
Iterator i = dataSnapshot.getChildren().iterator();
while (i.hasNext()) {
set.add(((DataSnapshot) i.next()).getKey());
}
listOfChats.clear();
listOfChats.addAll(set);
arrayAdapter.notifyDataSetChanged();
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(getApplicationContext(),ChatRoom.class);
intent.putExtra("roomName",((TextView)view).getText().toString());
intent.putExtra("userName",name);
startActivity(intent);
}
});
}
private void ifUserIsLoggedIn(){
FirebaseAuth auth = FirebaseAuth.getInstance();
FirebaseUser user = auth.getCurrentUser();
if(user != null){
}
else
startActivity(new Intent(this,LoginActivity.class));
}
private void enterUserName(){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Please enter A nick name:");
final EditText input = new EditText(this);
builder.setView(input);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
name = input.getText().toString();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
enterUserName();
}
});
builder.show();
}
}
这是ChatActivity
public class ChatRoom extends AppCompatActivity {
private Button sendMessageBtn;
private EditText inputMsg;
private TextView showMessage;
private DatabaseReference root;
private String userName,chatName,tempKey;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat_room);
sendMessageBtn = (Button)findViewById(R.id.sendmessagebtn);
inputMsg = (EditText)findViewById(R.id.messageEt);
showMessage = (TextView)findViewById(R.id.showMessage);
userName = getIntent().getExtras().get("userName").toString();
chatName = getIntent().getExtras().get("roomName").toString();
Log.v("username",userName);
Log.v("chatname",chatName);
setTitle(" Room " + chatName);
root = FirebaseDatabase.getInstance().getReference().child(chatName);
sendMessageBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Map<String,Object> map = new HashMap<String, Object>();
tempKey = root.push().getKey();
root.updateChildren(map);
DatabaseReference messageRoot = root.child(tempKey);
Map<String,Object> map2 = new HashMap<String, Object>();
map2.put("name",userName);
map2.put("message",inputMsg);
messageRoot.updateChildren(map2);
}
});
root.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
chatConversation(dataSnapshot);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
chatConversation(dataSnapshot);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private String chatMsg,chatUserName;
private void chatConversation(DataSnapshot dataSnapshot){
Iterator i = dataSnapshot.getChildren().iterator();
while(i.hasNext()){
chatMsg = (String)((DataSnapshot)i.next()).getValue();
chatUserName = (String)((DataSnapshot)i.next()).getValue();
showMessage.append(chatUserName + " : " + chatMsg +"\n" );
}
}
}
那是代码人员
答案 0 :(得分：0)
最后我发现了我的错误。
DatabaseReference messageRoot = root.child(tempKey);
Map<String,Object> map2 = new HashMap<String, Object>();
map2.put("name",userName);
map2.put("message",inputMsg); -- thats the line that crash the app
**map2.put("message",inputMsg.getText().toString());** should be like that
messageRoot.updateChildren(map2);