登录界面的实现

界面效果图：

以下为源代码：

activity_main.xml：

<?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: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.MainActivity">

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

    <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>

activity_main2.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_main2"
    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.Main2Activity">

    <TextView
        android:text="Welcome you"
        android:textSize="40sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="260dp"
        android:id="@+id/textView" />
</RelativeLayout>

login_top.xml：

<?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="请输入账号">

        <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="请输入密码"
        android:inputType="textPassword">

        <requestFocus />
    </EditText>

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

        <CheckBox
            android:text="记住密码"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/cbIsRememberPass"
            android:layout_weight="1" />

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


    </LinearLayout>
</RelativeLayout>

AndroidManifest.xml：

<?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=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Main2Activity.java：

package cn.edu.bzu.case_login;

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

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
    }
}

MainActivity.java：

package cn.edu.bzu.case_login;

import android.content.Context;
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;

public class MainActivity extends AppCompatActivity {
    private EditText etName;
    private EditText etPassword;
    private SharedPreferences sharedPreferences;
    private CheckBox cbIsRememberPass;

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

        }

    }
}

ExampleInstrumentedTest.java：

package cn.edu.bzu.case_login;

import android.content.Context;
import android.support.test.InstrumentationRegistry;
import android.support.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import static org.junit.Assert.*;

/**
 * Instrumentation test, which will execute on an Android device.
 *
 * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
 */
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
    @Test
    public void useAppContext() throws Exception {
        // Context of the app under test.
        Context appContext = InstrumentationRegistry.getTargetContext();

        assertEquals("cn.edu.bzu.case_login", appContext.getPackageName());
    }
}