[Do it! Android] 도전! 3. 로그인 화면과 메뉴 화면 간단히 만들기

AndroidManifest.xml 액티비티 등록

<activity android:name=".Sub1Activity">

</activity>

activity_main.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="horizontal"
    android:gravity="center"
    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="org.androidtown.a2_3.MainActivity">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <EditText
            android:id="@+id/id"
            android:layout_width="120dp"
            android:layout_height="50dp" />
        <EditText
            android:id="@+id/pw"
            android:layout_width="120dp"
            android:layout_height="50dp" />
    </LinearLayout>
    <Button
        android:id="@+id/login"
        android:layout_width="80dp"
        android:layout_height="100dp"
        android:onClick="login_onClick"
        android:text="로그인"/>

</LinearLayout>

activity_sub.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:gravity="center"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/customer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="고객 관리"
        android:onClick="Custom_onClick"/>

    <Button
        android:id="@+id/maechul"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="매출 관리"
        android:onClick="Maechul_onClick"/>

    <Button
        android:id="@+id/goods"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="상품 관리"
        android:onClick="Goods_onClick"/>

</LinearLayout>

MainActivity.java

package org.androidtown.a2_3;

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

public class MainActivity extends AppCompatActivity {

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

    public void login_onClick(View view){
        Intent intent = new Intent(getApplicationContext(), Sub1Activity.class);
        startActivityForResult(intent, 100);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data){
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == 100 && resultCode == RESULT_OK){
            Toast.makeText(getApplicationContext(), data.getStringExtra("result"), Toast.LENGTH_LONG).show();
        }
    }
}

Sub1Activity.java

package org.androidtown.a2_3;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class Sub1Activity extends MainActivity{

    Intent intent = new Intent();

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

    public void Custom_onClick(View v){
        intent.putExtra("result", "고객 관리 클릭함");
        setResult(RESULT_OK, intent);
        finish();
    }

    public void Maechul_onClick(View v){
        intent.putExtra("result", "고객 관리 클릭함");
        setResult(RESULT_OK, intent);
        finish();
    }

    public void Goods_onClick(View v){
        intent.putExtra("result", "고객 관리 클릭함");
        setResult(RESULT_OK, intent);
        finish();
    }


}