用户登录记录密码

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.edu.bzu.case_login">

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity"></activity>
</application>

</manifest>

package cn.edu.bzu.case_login;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class LoginActivity extends AppCompatActivity {
private EditText etName;
private EditText etPassword;
private SharedPreferences sharedPreferences ;
private CheckBox cbIsRemeberPass;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);

initViews();
sharedPreferences= getSharedPreferences("rememberpassword", Context.MODE_PRIVATE);
boolean isRemeber= sharedPreferences.getBoolean("rememberpassword",false);
if (isRemeber){
String name=sharedPreferences.getString("name","");
String password=sharedPreferences.getString("password","");
etName.setText(name);
etPassword.setText(password);
cbIsRemeberPass.setChecked(true);
}
}

private void initViews() {
etName=(EditText) findViewById(R.id.etName);
etPassword=(EditText)findViewById(R.id.etPassword);
cbIsRemeberPass=(CheckBox)findViewById(R.id.cbIsRememberPass);
}

public void login(View view){
String name=etName.getText().toString();
String password=etPassword.getText().toString();
if ("admain".equals(name)&&"123456".equals(password)){
SharedPreferences.Editor editor=sharedPreferences.edit();
if (cbIsRemeberPass.isChecked()){
editor.putBoolean("remeberpassword",true);
editor.putString("name",name);
editor.putString("password",password);
}else {
editor.clear();
}
editor.commit();
Intent intent=new Intent(this,MainActivity.class);
startActivity(intent);
finish();
}else {
Toast.makeText(this,"账号或密码有误",Toast.LENGTH_LONG.show());
}

}
}

package cn.edu.bzu.case_login;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}

activity_login.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_login"
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"
android:background="@drawable/loginbg"
tools:context="cn.edu.bzu.case_login.LoginActivity">

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/deer"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginBottom="20dp"
android:id="@+id/imageView" />
</RelativeLayout>

<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: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="cn.edu.bzu.case_login.MainActivity">

<TextView
android:text="Welcome you"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:textSize="40sp"
android:layout_marginTop="263dp"
android:id="@+id/textView" />
</RelativeLayout>

<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="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:background="@android:drawable/edit_text"
android:drawableLeft="@drawable/icon_user"
android:drawablePadding="10dp"
android:ems="10"
android:hint="@string/etName">

<requestFocus />
</EditText>

<EditText
android:id="@+id/etPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/etName"
android:background="@android:drawable/edit_text"
android:drawableLeft="@drawable/icon_pass"
android:drawablePadding="10dp"
android:ems="10"
android:hint="@string/etPass"
android:inputType="textPassword">

<requestFocus />
</EditText>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/etPassword">

<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/btn_select"
android:text="@string/btnLogin" />

<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginLeft="10dp"
android:background="@drawable/btn_select"
android:text="@string/btnRegister" />
</LinearLayout>
</RelativeLayout>