android 登录功能简介 获取EditText值进行比较

package com.example.qq;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.content.Intent;import android.view.LayoutInflater;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity {private Button btn;    private EditText et;    private EditText et2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                    et = (EditText)findViewById(R.id.editText1);              et2 = (EditText)findViewById(R.id.editText2);                        btn = (Button)findViewById(R.id.button1);        btn.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub    final String str = et.getText().toString().trim();    final String str2 = et2.getText().toString().trim();if (str.equals(str2)){Intent in = new Intent(MainActivity.this,SecActivity.class);startActivity(in);}else{System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!");}}});    }@Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    }