لدي مشكلة قمت بتصميم تطبيق دردشة ولكن عندما اقوم بفتح التطبيق يفتح معي ولكن عند الضغط علي زر الدردشة تظهر لي رسالة تقول توقف التطبيق عن العمل

وهذا ملف ال Manifest

<?xml version="1.0" encoding="utf-8"?><!-- suppress ALL -->

<manifest xmlns:android="

"

package="com.esoodevelop.genedyonlin">

<uses-permission
    android:name="android.permission.INTERNET">

</uses-permission>

<uses-permission
    android:name="android.permission.ACCESS_NETWORK_STATE">

</uses-permission>


<application
    android:allowBackup="true"
    android:icon="@mipmap/icgenedy_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/icgenedy_launcher"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    android:fullBackupContent="@xml/backup_descriptor">
    <activity android:name=".GenedyOnlin">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".GenedyOnlin2" />
    <activity android:name=".GenedyOnlin3" />
    <activity android:name=".GenedyOnlin5" />
    <activity android:name=".MainActivity" />
    <activity android:name=".ChateRoom" />

</application>

وهذا ملف الجافا Mainactivty

package com.esoodevelop.genedyonlin;

import android.content.DialogInterface; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.widget.EditText; import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    AlertDialog dialog = new AlertDialog.Builder(this).create();
    final EditText editText = new EditText(this);
    dialog.setTitle("ادخل اسمك");
    dialog.setView(editText);
    dialog.setButton(DialogInterface.BUTTON_POSITIVE, "ok", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            String name = editText.getText().toString();
            if (!TextUtils.isEmpty(name)) {
                Intent intent = new Intent(MainActivity.this,ChateRoom.class);
                intent.putExtra("Name", name);
                startActivity(intent);
            }else{
                Toast.makeText(MainActivity.this, "ادخل اسمك", Toast.LENGTH_SHORT).show();
            }

        }

    });
    dialog.show();

}

}

وهذا ملف الجافا الخاص بالدردشة package com.esoodevelop.genedyonlin;

import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListView;

import com.google.firebase.database.ChildEventListener; import com.google.firebase.database.DataSnapshot; import com.google.firebase.database.DatabaseError; import com.google.firebase.database.DatabaseReference; import com.google.firebase.database.FirebaseDatabase;

import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.Map;

public class ChateRoom extends AppCompatActivity {

private DatabaseReference root;
private String temp_key;
private EditText input_msg;
private ListView listView_chat;
ArrayList<String> list_chat = new ArrayList<>();
ArrayAdapter<String> arrayAdapter;
private String name;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_chate_room);

    root = FirebaseDatabase.getInstance().getReference().child("MainChatRoom");


    listView_chat = (ListView) findViewById(R.id.listView_chat);
    input_msg = (EditText) findViewById(R.id.input_msg);
    Button btn_send_msg = (Button) findViewById(R.id.btn_send_msg);

    name = getIntent().getExtras().getString("Name");

    arrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, list_chat);
    listView_chat.setAdapter(arrayAdapter);

    btn_send_msg.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Map<String, Object> map = new HashMap<>();
            temp_key = root.push().getKey();
            root.updateChildren(map);

            DatabaseReference message_root = root.child(temp_key);
            Map<String, Object> map2 = new HashMap<>();
            map2.put("name", name);
            map2.put("msg", input_msg.getText().toString());

            message_root.updateChildren(map2);
        }
    });


    root.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            Add_Chat(dataSnapshot);
        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {
            Add_Chat(dataSnapshot);

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

}


private void Add_Chat(DataSnapshot dataSnapshot) {

    Iterator i = dataSnapshot.getChildren().iterator();
    input_msg.setText("");
    while (i.hasNext()) {

        String chat_msg = (String) ((DataSnapshot) i.next()).getValue();
        String chat_user_name = (String) ((DataSnapshot) i.next()).getValue();

        list_chat.add(chat_user_name + " : " + chat_msg);
        arrayAdapter.notifyDataSetChanged();
        listView_chat.setSelection(list_chat.size());
    }


}

}

الرجاء المساعدة وشكرا