登录密码

activity_top 顶端布局
<?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="com.example.bz0209.myapplication.MainActivity">


    <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="please input number" />


    <EditText
        android:id="@+id/etPass"
        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="please input password"
        android:inputType="textPassword" />


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


        <CheckBox
            android:id="@+id/cbIsRememberPass"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="记住密码"
            android:textSize="14sp" />


        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="100dp"
            android:layout_weight="1"
            android:onClick="login"
            android:text="登录" />
    </LinearLayout>
</RelativeLayout>


activity_login 登录布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_login"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#282"
    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="com.example.bz0209.myapplication.MainActivity">


    <include layout="@layout/activity_top"></include>


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




activity_main 欢迎界面
<?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="com.example.bz0209.myapplication.MainActivity">


    <EditText
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="192dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="       Welcome to here"
        android:textSize="30sp" />
</RelativeLayout>


MainActivity  控制代码
package com.example.bz0209.myapplication;


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 MainActivity extends AppCompatActivity {
    private EditText etName;
    private EditText etPass;
    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 pass=sharedPreferences.getString("pass","");
            etName.setText(name);
            etPass.setText(pass);
            cbIsRememberPass.setChecked(true);
        }
    }


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


    public void login(View view){
        String name=etName.getText().toString();
        String pass=etPass.getText().toString();
        if("admin".equals(name)&&"123456".equals(pass)){
            SharedPreferences.Editor editor=sharedPreferences.edit();
            if(cbIsRememberPass.isChecked()){
                editor.putBoolean("rememberPassword",true);
                editor.putString("name",name);
                editor.putString("pass",pass);
            }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();
        }
    }
}