AndroID存储方式有很多种,在这里所用的存储方式是SharedPreferrences, 其采用了Map数据结构来存储数据,以键值的方式存储,可以简单的读取与写入。所以比较适合我们今天做的这个项目。我们来看一下运行图:
一.布局界面
1.login_top.xml
<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" androID:orIEntation="vertical" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:padding="@dimen/activity_horizontal_margin" androID:background="@drawable/logintop_roundbg"> <EditText androID:ID="@+ID/etname" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:ems="10" androID:drawablepadding="10dp" androID:background="@androID:drawable/edit_text" androID:drawableleft="@drawable/icon_user" androID:hint="@string/etname"> <requestFocus></requestFocus> </EditText> <EditText androID:ID="@+ID/etPassword" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:layout_below="@ID/etname" androID:inputType="textPassword" androID:ems="10" androID:drawablepadding="10dp" androID:background="@androID:drawable/edit_text" androID:drawableleft="@drawable/icon_pass" androID:hint="@string/etpassword"> <requestFocus></requestFocus> </EditText> <CheckBox androID:ID="@+ID/cbremenber" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:layout_below="@ID/etPassword" androID:text="@string/cbpass"/> <linearLayout androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:layout_below="@ID/cbremenber"> <button androID:ID="@+ID/btnlogin" androID:layout_wIDth="0dp" androID:layout_height="wrap_content" androID:layout_weight="1" androID:background="@drawable/btnselect" androID:text="@string/btnlogin" androID:onClick="login"/> <button androID:ID="@+ID/btnRegister" androID:layout_wIDth="0dp" androID:layout_height="wrap_content" androID:layout_weight="1" androID:background="@drawable/btnselect" androID:text="@string/btnRegister" androID:layout_marginleft="10dp"/> </linearLayout></relativeLayout>
2.activity_main.xml
<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" xmlns:tools="http://schemas.androID.com/tools" androID:ID="@+ID/activity_main" androID:layout_wIDth="match_parent" androID:layout_height="match_parent" androID:background="@drawable/loginbg" tools:context="cn.edu.bzu.logindemo.MainActivity"> <include layout="@layout/login_top"></include> <ImageVIEw androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:background="@drawable/deer" androID:layout_alignParentBottom="true" androID:layout_alignParentRight="true" androID:layout_alignParentEnd="true" /></relativeLayout>
3.activity_welcome.xml
<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" xmlns:tools="http://schemas.androID.com/tools" androID:ID="@+ID/activity_welcome" androID:layout_wIDth="match_parent" androID:layout_height="match_parent" tools:context="cn.edu.bzu.logindemo.WelcomeActivity"> <TextVIEw androID:ID="@+ID/tvwelcome" androID:text="Welcome you" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:layout_alignParenttop="true" androID:layout_centerHorizontal="true" androID:layout_margintop="200dp" androID:textSize="40sp" /></relativeLayout>
二.MainActivity
public class MainActivity extends AppCompatActivity { private EditText etname; private EditText etPassword; private SharedPreferences sharedPreferences; private CheckBox cbremenber; @OverrIDe protected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.activity_main); initVIEws(); sharedPreferences=getSharedPreferences("remenberpassword",Context.MODE_PRIVATE); boolean isRemember=sharedPreferences.getBoolean("remenberpassword",false); if(isRemember) { String name = sharedPreferences.getString("name",""); String password = sharedPreferences.getString("password",""); etname.setText(name); etPassword.setText(password); cbremenber.setChecked(true); } } private voID initVIEws() { etname=(EditText) findVIEwByID(R.ID.etname); etPassword=(EditText) findVIEwByID(R.ID.etPassword); cbremenber=(CheckBox)findVIEwByID(R.ID.cbremenber); } public voID login(VIEw vIEw){ String name=etname.getText().toString(); String password=etPassword.getText().toString(); if("admin".equals(name)&&"123456".equals(password)){ SharedPreferences.Editor editor= sharedPreferences.edit(); if(cbremenber.isChecked()){ editor.putBoolean("remenberpassword",true); editor.putString("name",name); editor.putString("password",password); }else { editor.clear(); } editor.commit(); Intent intent=new Intent(this,WelcomeActivity.class); startActivity(intent); finish(); }else { Toast.makeText(this,"账号或密码有误",Toast.LENGTH_LONG).show(); } }}
三.WelcomeActivity
public class WelcomeActivity extends AppCompatActivity { @OverrIDe protected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.activity_welcome); }}
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