Android 使用SharedPreferrences储存密码登录界面记住密码功能

 <?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>

 <?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>

<?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>

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(); } }}

 public class WelcomeActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_welcome); }}