我收到错误 消息“无法解析符号“ OnClickListener” 和 “无法解析符号“ V””，
我开始使用Java，因此我不太擅长此语言，并且对语言不太熟悉

我的代码：

package com.emiliogaines.counter.counter;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity extends Activity {

    Button mButton = (Button) findViewById(R.id.More);

    mButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            final TextView mTextView = (TextView) findViewById(R.id.Antal);
            mTextView.setText("Some Text");
        }
    });

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar
        // if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}