Android studio error in java main activity?

fellows hope you all are doing good.I am dealing with a problem which seems not ending i tried every thing to remove errors but nothing seems to work this is my java code which i am using it would be highly appreciative if you correct it. i imported it from eclipse if you need other code too please let me know.

package com.uichat;

import android.app.Activity;

import android.content.Intent;

import android.database.DataSetObserver;

import android.os.Bundle;

import android.view.KeyEvent;

import android.view.View;

import android.widget.AbsListView;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ListView;

import java.io.ByteArrayOutputStream;

public class MainActivity extends Activity{

private ChatArrayAdapter adp;
private ListView list;
private EditText ChatText;
private Button send;
Intent In;


public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Intent I = getIntent();
    send = (Button) findViewById(R.id.btn);
    list = (ListView) findViewById(R.id.list);
    adp = new ChatArrayAdapter(getApplicationContext(), R.layout.chat);
    ChatText = (EditText) findViewById(R.id.chat);
    ChatText.setKeyListener(new OnKeyListener() {
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
                return sendChatMessage(false);
            }
            return false;
        }


    });

    send.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {
            sendChatMessage(false);

        }
    });

    list.setTranscriptMode(AbsListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
    list.setAdapter(adp);

    adp.registerDataSetObserver(new DataSetObserver() {
        @Override
        public void onChanged() {
            super.onChanged();
            list.setSelection(adp.getCount() - 1);
        }
    });
}

private boolean sendChatMessage(boolean side) {

    adp.add(new ChatMessage(side, ChatText.getText().toString()));
    ChatText.setText("");
    side = !side;
    return true;
}





public ListView getList() {
    return list;
}

public void setList(ListView list) {
    this.list = list;
}

class EditView {


    private String text;

    public void setOnKeyListener(OnKeyListener onKeyListener) {

    }

    public boolean getText() {
        return true;
    }

    public void setText(String text) {
        this.text = text;
    }
}

class OnKeyListener {
}

}