android中实现记住密码功能

运行效果图






实例程序讲解

在打开登陆界面时，程序会自动填写上次您输入正确的用户名和密码。小编本次为大家提供的是用SharePreferences对象来实现此功能的。

activity_main.xml

<span style="font-size:18px;"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@drawable/loginbg"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<include layout="@layout/login_top"/>
<include layout="@layout/login_bottom"/>"

</LinearLayout></span>

<strong>login_bottom.xml</strong>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/tvRegist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="21dp"
        android:layout_marginTop="18dp"
        android:text="@string/tvRegister"
        android:autoLink="all"
        android:textColorLink="#FF0066CC" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="24dp"
        android:src="@drawable/panda" />

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="28dp"
        android:src="@drawable/icon" />

</RelativeLayout><strong>
</strong>

login_top.xml

<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/btnbg_roundcorner"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin" >

<TextView
android:id="@+id/tvUsername"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="@string/tvName"
android:textAppearance="?android:attr/textAppearanceMedium" />

<EditText
android:id="@+id/etUsername"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/tvUsername"
android:layout_below="@+id/tvUsername"
android:background="@android:drawable/edit_text"
android:ems="10" >

<requestFocus />
</EditText>

<TextView
android:id="@+id/tvPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/etUsername"
android:layout_below="@+id/etUsername"
android:text="@string/tvPassword"
android:textAppearance="?android:attr/textAppearanceMedium" />

<EditText
android:id="@+id/etPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/tvPassword"
android:layout_below="@+id/tvPassword"
android:layout_marginTop="16dp"
android:background="@android:drawable/edit_text"
android:ems="10"
android:inputType="textPassword" />

<Button
android:id="@+id/btnLogin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/etPassword"
android:layout_below="@+id/etPassword"
android:layout_marginTop="20dp"
android:background="#FF72CAE1"

android:text="@string/btnLogin" />

<CheckBox
android:id="@+id/cbRememberPass"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/etPassword"
android:layout_alignTop="@+id/btnLogin"

android:text="记住密码" />

</RelativeLayout></span>

activity_success.xml

<span style="font-size:18px;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".SuccessActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/success" />

</RelativeLayout></span>

我们定义了一个CheckBox控件，当用户但及登录按钮时如果勾选了此对话框，则可以记住用户输入的用户名和密码。

代码如下

package com.example.minitwittersimulate;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
private EditText etUsername;
private EditText etPassword;
private CheckBox cbRememberPass;
private Button btnLogin;
protected SharedPreferences mSpSettings = null;
private static final String PREFS_NAME = "NamePwd";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
findView();
setListener();

getData();
}
private void findView(){
etUsername=(EditText) findViewById(R.id.etUsername);
etPassword=(EditText) findViewById(R.id.etPassword);
cbRememberPass=(CheckBox) findViewById(R.id.cbRememberPass);
btnLogin=(Button) findViewById(R.id.btnLogin);
}//绑定控件
private void setListener(){
btnLogin.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if("wyl".equals(etUsername.getText().toString()) && "123".equals(etPassword.getText().toString())){
//判断用户名和密码
if(cbRememberPass.isChecked()){
//判断复选框是否选中
mSpSettings=getSharedPreferences(PREFS_NAME,  Context.MODE_PRIVATE);
Editor edit=mSpSettings.edit();
edit.putBoolean("isKeeep", true);
edit.putString("username", etUsername.getText().toString());
edit.putString("password", etPassword.getText().toString());
edit.commit();
//选中后记住密码
}
else{
mSpSettings=getSharedPreferences(PREFS_NAME, MODE_PRIVATE);
Editor edit=mSpSettings.edit();
edit.putBoolean("isKeeep", false);
edit.putString("username", "");
edit.putString("password", "");
edit.commit();
//未选中没有记住密码
}
Intent intent =new Intent(MainActivity.this,SuccessActivity.class);
startActivity(intent);

}
else{
Toast.makeText(getApplicationContext(), "用户名或密码错误", Toast.LENGTH_SHORT).show();
}
}
});

}
@Override
protected void onResume(){
super.onResume();
getData();
}//在界面显示之前得到数据
private void getData() {
// TODO Auto-generated method stub
mSpSettings = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
if(mSpSettings.getBoolean("isKeep",true)){
etUsername.setText(mSpSettings.getString("username", ""));
etPassword.setText(mSpSettings.getString("password", ""));
}//如果之前存储过，则显示在相应的文本里
else
{
etUsername.setText("");
etPassword.setText("");
}//如果之前没有显示过，则显示为空。
}
}

package com.example.minitwittersimulate;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class SuccessActivity extends Activity {

<span style="white-space:pre">	</span>@Override
<span style="white-space:pre">	</span>protected void onCreate(Bundle savedInstanceState) {
<span style="white-space:pre">		</span>super.onCreate(savedInstanceState);
<span style="white-space:pre">		</span>setContentView(R.layout.activity_success);
<span style="white-space:pre">	</span>}

<span style="white-space:pre">	</span>@Override
<span style="white-space:pre">	</span>public boolean onCreateOptionsMenu(Menu menu) {
<span style="white-space:pre">		</span>// Inflate the menu; this adds items to the action bar if it is present.
<span style="white-space:pre">		</span>getMenuInflater().inflate(R.menu.success, menu);
<span style="white-space:pre">		</span>return true;
<span style="white-space:pre">	</span>}

}

有什么需要改进的地方，大家可以留言交流哈．