Android实现记住用户名和密码功能

 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;
   }

//通过
boolean CheckBoxLogin = checkbox.isChecked();
   //按钮被选中，下次进入时会显示账号和密码       
   if (CheckBoxLogin)
   {
     Editor editor = sp.edit();
     editor.putString("uname", name);
     editor.putString("upswd", pswd);
     editor.putBoolean("auto", true);
     editor.commit();
   }
   //按钮被选中，清空账号和密码，下次进入时会显示账号和密码    
   else   
   { 
    Editor editor = sp.edit();
    editor.putString("uname", null);
    editor.putString("upswd", null);
    editor.putBoolean("auto", false);
    editor.commit();
    }

//先定义
SharedPreferences sp = null; 

sp = this.getSharedPreferences("userinfo", Context.MODE_PRIVATE);
//对uname 和 upswd 的操作
 if (sp.getBoolean("checkboxBoolean", false))
   {
    uname.setText(sp.getString("uname", null));
    upswd.setText(sp.getString("upswd", null)); 
    checkboxButton.setChecked(true);

   }

//Intent跳转
Intent intent = new Intent(Welcome.this,Content.class);
startActivity(intent);
finish();

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package com.gxs.login;
import com.example.login.R;
import com.gxs.listview.*;
import android.os.Bundle;
import android.preference.Preference;
import android.app.Activity;
import android.app.SearchManager.OnCancelListener;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;
import android.view.Menu;
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 Welcome extends Activity implements OnClickListener{
 private EditText uname = null;
 private EditText upswd = null;
 private CheckBox checkboxButton = null;
 private Button login = null;
 SharedPreferences sp = null; 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.layout_main);
  sp = this.getSharedPreferences("userinfo", Context.MODE_PRIVATE);
  init();

 }

 public void init()
 {
  uname = (EditText) findViewById(R.id.user_input);
  upswd = (EditText) findViewById(R.id.pass_input);
  checkboxButton = (CheckBox) findViewById(R.id.checkBoxLogin);
  login = (Button) findViewById(R.id.new_user);
  if (sp.getBoolean("checkboxBoolean", false))
   {
    uname.setText(sp.getString("uname", null));
    upswd.setText(sp.getString("upswd", null)); 
    checkboxButton.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 CheckBoxLogin = checkboxButton.isChecked();
   if (CheckBoxLogin)
   {
     Editor editor = sp.edit();
     editor.putString("uname", name);
     editor.putString("upswd", pswd);
     editor.putBoolean("checkboxBoolean", true);
     editor.commit();
   }
   else
   { 
    Editor editor = sp.edit();
    editor.putString("uname", null);
    editor.putString("upswd", null);
    editor.putBoolean("checkboxBoolean", false);
    editor.commit();
    }
   //Intent跳转
   Intent intent=new Intent(Welcome.this,Content.class);
   startActivity(intent);
   finish();
  }
 }

}

package com.gxs.listview;
import java.util.List;
import com.example.login.R;
import com.gxs.*;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Content extends Activity{
 private ListView listview_fruits; 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.content);

 }
}