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我正在开发聊天应用程序,而我刚刚开始。我有一个活动,用户可以打开聊天室并删除。我的问题是与删除。我可以成功从列表中删除聊天室,但我不知道如何从Firebase中将其删除。 问题是我使用longclick,我的意思是如果用户想要删除聊天室,他需要点击聊天室,但长按一下,然后删除选项弹出。然后按下“删除”按钮并从列表中删除它。Android - 如何删除Firebase中的房间
聊天室代码
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(); // Method that checks if the user is logged in. if not, it will take the
// user to Login Activity
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);
// this method delete a chat room after a long click when "delete" button press
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()){
case R.id.delete:
arrayAdapter.remove(arrayAdapter.getItem(info.position));
root.removeValue(arrayAdapter.getItem(info.position));
}
return super.onContextItemSelected(item);
}
在public boolean onContextItemSelected(MenuItem item)
方法获取列表的ID,并从列表中删除。 但我不知道如何从firebase中删除它。在firebase中,我将其保存为根。如果代码丢失,请让我知道这样我就可以上传更多的代码
编辑 - 创建聊天代码
createChat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
InputMethodManager mgr = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
mgr.hideSoftInputFromInputMethod(chatRoomName.getWindowToken(),0);
// send to the fire base the data. it sends only the name of the room, with no any key.
Map<String, Object> map = new HashMap<String, Object>();
map.put(chatRoomName.getText().toString(), "");
root.updateChildren(map);
chatRoomName.setText("");
}
});
我已经添加了创建聊天室的代码 –
确定我认为我的代码应该可以工作 - 你试过吗? – Benoit
是的,它的工作!你做对了! –