Android实现用户登录记住密码功能

2019-12-12 02:51:43

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来源：转载

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一、打开之前完成的Case_login进行修改再编辑

二、将注册按钮删除并在登录按钮前拖出一个checkBox,编辑代码如下：

在layout_top.xml文件中进行编辑

<?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: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>

效果图如下：

三、对登录密码及记住密码进行编辑

在LoginAcitvity.java文件进行编写修改，代码如下：

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 CheckBox cbIsRememberPass; private SharedPreferences sharedPreferences; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_login);  initViews();  sharedPreferences=getSharedPreferences("rememberpassword", Context.MODE_PRIVATE);  boolean isRemember=sharedPreferences.getBoolean("rememberpassword",false);  if(isRemember){   String name=sharedPreferences.getString("name","");   String password=sharedPreferences.getString("password","");   etName.setText(name);   etPassword.setText(password);   cbIsRememberPass.setChecked(true);  } } private void initViews(){  etName=(EditText)findViewById(R.id.etName);  etPassword=(EditText)findViewById(R.id.etPassword);  cbIsRememberPass=(CheckBox) findViewById(R.id.cbIsRememberPass); } 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(cbIsRememberPass.isChecked()){    editor.putBoolean("rememberpassword",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,"账户或密码错误",Toast.LENGTH_LONG).show();  } }}

四、设计登录后的界面

新建一个MainActivity.java文件，同时生成一个activity_main.xml,对其进行编写代码效果图如下：

<?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: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_centerVertical="true"  android:layout_centerHorizontal="true"  android:textSize="40sp"  android:id="@+id/textView" /></RelativeLayout>