android数据存储之sharedPreferences记住密码完成跳转

根据两个文本输入框的值，存储到数据库中，记住密码后，

等到下载登陆的时候，就可以不用输入密码了。

下面是具体的代码：

package com.example.minitwittersimulate;import android.app.Activity;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.os.Bundle;import android.preference.PreferenceManager;import android.text.TextUtils;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnFocusChangeListener;import android.view.Window;import android.widget.CheckBox;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class LoginActivity extends Activity {private EditText etUsername;private EditText etPassword;private CheckBox cbIsRememberPass;private SharedPreferences sharedPreferences;private boolean rememberpassword;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_login);initViews();initValues();}@Override      protected void onResume() {  //super.onResume();  if (rememberpassword) {Log.d("MainActivity", "密码111");cbIsRememberPass.setChecked(false);etPassword.setOnFocusChangeListener(new OnFocusChangeListener() {public void onFocusChange(View view, boolean flag) {          if (flag) {        Log.d("MainActivity", "密码222");String username = etUsername.getText().toString();Log.d("MainActivity", "username密码222"+username);String savedUsername = sharedPreferences.getString("username", "");Log.d("MainActivity", "savedUsername密码222"+savedUsername);  if (username.equals(savedUsername)){String password=sharedPreferences.getString("userpassword", "");Log.d("MainActivity", "密码"+password);etPassword.setText(password);etPassword.setSelection(password.length());}}}                 });} }private void initValues() {sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);rememberpassword = sharedPreferences.getBoolean("rememberpassword",false);}private void initViews() {etUsername = (EditText) findViewById(R.id.etUsername);etPassword = (EditText) findViewById(R.id.etPassword);cbIsRememberPass = (CheckBox) findViewById(R.id.cbRememberPass);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}public void login(View view) { //要写的内容、数据存储String username=(String)etUsername.getText().toString();String password=(String)etPassword.getText().toString();if(!(TextUtils.isEmpty(username))&&!(TextUtils.isEmpty(password))){if("admin".equals(username)&&"123456".equals(password)){Editor editor=sharedPreferences.edit();if(cbIsRememberPass.isChecked()){editor.putString("username", username);editor.putString("userpassword", password);editor.putBoolean("rememberpassword", true);editor.commit();}Intent intent=new Intent(this, MainActivity.class);startActivity(intent);}}}}

下面是UI布局

activity_login.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=".LoginActivity" >  <include layout="@layout/login_top"/>   <include layout="@layout/login_bottom"/>"</LinearLayout></span>

login_bottom.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" >    <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></span>

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:background="@android:drawable/edit_text"        android:ems="10"        android:inputType="textPassword" />    <CheckBox        android:id="@+id/cbRememberPass"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/btnLogin"        android:layout_alignBottom="@+id/btnLogin"        android:layout_alignLeft="@+id/etPassword"        android:text="记住密码"        android:textSize="20sp" />    <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:background="#FF72CAE1"        android:onClick="login"//<span style="color:#ff0000;"><strong>调用login()方法</strong></span>        android:text="@string/btnLogin" /></RelativeLayout></span>

然后等下次登陆时，就可以不用输入密码，实现记住密码功能。

完整的程序连接地址：http://pan.baidu.com/s/1geOnEhH