Android--记住密码

package blk4.por;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class Blk4Activity extends Activity implements OnClickListener{
    /** Called when the activity is first created. */
    private EditText uname = null;
    private EditText upswd = null;
    private CheckBox auto = null;
    private Button login = null;
    SharedPreferences sp = null;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        sp = this.getSharedPreferences("userinfo", Context.MODE_PRIVATE);
        init();
    }
    public void init()
    {
        uname = (EditText) findViewById(R.id.uname);
        upswd = (EditText) findViewById(R.id.upswd);
        auto = (CheckBox) findViewById(R.id.auto);
        login = (Button) findViewById(R.id.login);
        if (sp.getBoolean("auto", false))
              {
                  uname.setText(sp.getString("uname", null));
                  upswd.setText(sp.getString("upswd", null));
                  auto.setChecked(true);

              }
        login.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {

        if (v == login){
            String name = uname.getText().toString();
             String pswd = upswd.getText().toString();
             if(name.trim().equals("")){
                Toast.makeText(this, "请您输入用户名！", Toast.LENGTH_SHORT).show();
                return;
            }
            if(pswd.trim().equals("")){
                Toast.makeText(this, "请您输入密码！", Toast.LENGTH_SHORT).show();
                return;
            }
            boolean autoLogin = auto.isChecked();
            if (autoLogin)
            {
                    Editor editor = sp.edit();
                    editor.putString("uname", name);
                    editor.putString("upswd", pswd);
                    editor.putBoolean("auto", true);
                    editor.commit();
            }
            else
            {
                Editor editor = sp.edit();
                editor.putString("uname", null);
                editor.putString("upswd", null);
                editor.putBoolean("auto", false);
                editor.commit();}

        }}

        // TODO Auto-generated method stub

}