实验3:android数据储存和访问----登录记住密码功能_Benbeikeman的博客

1.主要代码如下

[java] 

    public class LoginActivity extends Activity {  
        private EditText etUser,etPassword;//定义用户名和密码  
        private CheckBox cbRemember;//定义记住密码  
        private Button btnLogin;//登录按钮  
          
        private SharedPreferences mSpSettings=null;//声明一个sharedPreferences用于保存数据  
        private static final String PREPS_NAME="NamePwd";  
        @Override  
        protected void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.activity_login);  
            setTitle("登录界面");  
            findById();//获取控件  
            setListener();//绑定事件  
            getData();  
        }  
        private void setListener() {  
            btnLogin.setOnClickListener(new OnClickListener() {  
                @Override  
                public void onClick(View view) {  
                    if(etUser.getText().toString().equals("zsh")&&etPassword.getText().toString().equals("123")){  
                        //判断是否记住密码,复选框是否选中  
                        if(cbRemember.isChecked()){  
                            mSpSettings=getSharedPreferences(PREPS_NAME, MODE_PRIVATE);  
                            Editor edit=mSpSettings.edit();//得到Editor对象  
                            edit.putBoolean("isKeep", true);//记录保存标记  
                            edit.putString("username", etUser.getText().toString());//记录用户名  
                            edit.putString("password", etPassword.getText().toString());//记录密码  
                            edit.commit();//**提交  
                        }else {  
                            mSpSettings=getSharedPreferences(PREPS_NAME, MODE_PRIVATE);  
                            Editor edit=mSpSettings.edit();  
                            edit.putBoolean("isKeep", true);//保存的文件名isKeep  
                            edit.putString("username", "");  
                            edit.putString("password", "");  
                            edit.commit();  
                        }  
                        //跳转  
                        Intent intent=new Intent(LoginActivity.this, LoginShowActivity.class);  
                        startActivity(intent);  
                    }else{  
                        Toast.makeText(LoginActivity.this, "密码或者用户名错误", Toast.LENGTH_SHORT).show();  
                    }  
                }  
            });  
        }  
        @Override  
        protected void onResume() {  
            super.onResume();  
            getData();//在界面显示数据之前得到之前存储的数据  
        }  
        private void getData() {  
            mSpSettings=getSharedPreferences(PREPS_NAME, MODE_PRIVATE);  
            if(mSpSettings.getBoolean("isKeep", false)){  
                //如果之前存储过,则显示在相应文本框内  
                etUser.setText(mSpSettings.getString("username", ""));  
                etPassword.setText(mSpSettings.getString("password", ""));  
            }else{//否则显示为空  
                etUser.setText("");  
                etPassword.setText("");  
            }  
        }  
        private void findById() {  
            etUser=(EditText) findViewById(R.id.etUser);  
            etPassword=(EditText) findViewById(R.id.etPassword);  
            cbRemember=(CheckBox) findViewById(R.id.cbRemember);  
            btnLogin=(Button) findViewById(R.id.btnLogin);  
        }  
      
    }  [java] 

    public class L