Android实现带有记住密码功能的登陆界面

/*author: conowen  * date: 2012.4.2  *  */ package com.conowen.remeberPwd;  import android.app.Activity; import android.content.SharedPreferences; import android.os.Bundle; import android.text.Editable; import android.text.InputType; import android.text.TextWatcher; import android.view.View; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.AutoCompleteTextView; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; import android.widget.Toast;  public class RemeberPwdActivity extends Activity {   AutoCompleteTextView cardNumAuto;  EditText passwordET;  Button logBT;   CheckBox savePasswordCB;  SharedPreferences sp;  String cardNumStr;  String passwordStr;   /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.main);  cardNumAuto = (AutoCompleteTextView) findViewById(R.id.cardNumAuto);  passwordET = (EditText) findViewById(R.id.passwordET);  logBT = (Button) findViewById(R.id.logBT);   sp = this.getSharedPreferences("passwordFile", MODE_PRIVATE);  savePasswordCB = (CheckBox) findViewById(R.id.savePasswordCB);  savePasswordCB.setChecked(true);// 默认为记住密码  cardNumAuto.setThreshold(1);// 输入1个字母就开始自动提示  passwordET.setInputType(InputType.TYPE_CLASS_TEXT  | InputType.TYPE_TEXT_VARIATION_PASSWORD);  // 隐藏密码为InputType.TYPE_TEXT_VARIATION_PASSWORD，也就是0x81  // 显示密码为InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD，也就是0x91   cardNumAuto.addTextChangedListener(new TextWatcher() {   @Override  public void onTextChanged(CharSequence s, int start, int before,   int count) {  // TODO Auto-generated method stub  String[] allUserName = new String[sp.getAll().size()];// sp.getAll().size()返回的是有多少个键值对  allUserName = sp.getAll().keySet().toArray(new String[0]);  // sp.getAll()返回一张hash map  // keySet()得到的是a set of the keys.  // hash map是由key-value组成的   ArrayAdapter<String> adapter = new ArrayAdapter<String>(   RemeberPwdActivity.this,   android.R.layout.simple_dropdown_item_1line,   allUserName);   cardNumAuto.setAdapter(adapter);// 设置数据适配器   }   @Override  public void beforeTextChanged(CharSequence s, int start, int count,   int after) {  // TODO Auto-generated method stub   }   @Override  public void afterTextChanged(Editable s) {  // TODO Auto-generated method stub  passwordET.setText(sp.getString(cardNumAuto.getText()   .toString(), ""));// 自动输入密码   }  });   // 登陆  logBT.setOnClickListener(new OnClickListener() {   @Override  public void onClick(View v) {  // TODO Auto-generated method stub   cardNumStr = cardNumAuto.getText().toString();  passwordStr = passwordET.getText().toString();   if (!((cardNumStr.equals("test")) && (passwordStr   .equals("test")))) {   Toast.makeText(RemeberPwdActivity.this, "密码错误，请重新输入",   Toast.LENGTH_SHORT).show();  } else {   if (savePasswordCB.isChecked()) {// 登陆成功才保存密码   sp.edit().putString(cardNumStr, passwordStr).commit();   }   Toast.makeText(RemeberPwdActivity.this, "登陆成功，正在获取用户数据……",   Toast.LENGTH_SHORT).show();   // 跳转到另一个Activity   // do something   }   }  });   }  } 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:orientation="vertical" >   <TextView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_gravity="center_horizontal"  android:text="简单登陆DEMO"  android:textSize="25px" />   <LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:gravity="center"  android:orientation="vertical" >   <LinearLayout  android:layout_width="250dip"  android:layout_height="wrap_content"  android:layout_marginLeft="10dp"  android:layout_marginRight="10dp"  android:layout_marginTop="15dp"  android:orientation="vertical" >   <LinearLayout  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:orientation="horizontal" >   <LinearLayout   android:layout_width="fill_parent"   android:layout_height="80px"   android:orientation="vertical" >    <LinearLayout   android:layout_width="fill_parent"   android:layout_height="40px"   android:orientation="horizontal" >    <TextView   android:id="@+id/tv_account"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_marginRight="10dp"   android:text="用 户 名:"   android:textSize="15px" />    <AutoCompleteTextView   android:id="@+id/cardNumAuto"   android:layout_width="fill_parent"   android:layout_height="40px" >   </AutoCompleteTextView>   </LinearLayout>    <LinearLayout   android:layout_width="fill_parent"   android:layout_height="40px"   android:orientation="horizontal" >    <TextView   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_marginRight="10dp"   android:text="用户密码:"   android:textSize="15px" />    <EditText   android:id="@+id/passwordET"   android:layout_width="fill_parent"   android:layout_height="40px" >   </EditText>   </LinearLayout>  </LinearLayout>  </LinearLayout>   <LinearLayout  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:orientation="horizontal" >   <CheckBox   android:id="@+id/savePasswordCB"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_marginLeft="20dp"   android:text="记住密码" >  </CheckBox>   <Button   android:id="@+id/logBT"   android:layout_width="100px"   android:layout_height="wrap_content"   android:layout_marginLeft="40dp"   android:layout_marginRight="10dp"   android:text="登录" >  </Button>  </LinearLayout>  </LinearLayout>  </LinearLayout>  </LinearLayout> 

<?xml version='1.0' encoding='utf-8' standalone='yes' ?> <map> <string name="test">test</string> <string name="test2">test</string> <string name="test1">test</string> </map>