khon98

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <VideoView
        android:id="@+id/videoView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

----------------------------

----------------------------

MainActivity.java

package com.example.videoview;

import androidx.appcompat.app.AppCompatActivity;

import android.net.Uri;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.VideoView;

public class MainActivity extends AppCompatActivity {

    private VideoView videoView; // 비디오를 실행할 수 있게 도와주는 뷰
    private MediaController mediaController; // 재생이나 정지와 같은 미디어 제어 버튼부를 담당
    private String videoURL = "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4";

    @Override
    protected void onCreate(Bundle savedInstanceState) { // 앱이 첫 실행 됐을때 이곳을 수행
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        videoView = findViewById(R.id.videoView); // 비디오 뷰 아이디 연결
        mediaController = new MediaController(this);
        mediaController.setAnchorView(videoView);
        Uri uri = Uri.parse(videoURL);
        videoView.setMediaController(mediaController); // 미디어 제어 버튼부 세팅팅
        videoView.setVideoURI(uri); // 비디오 뷰의 주소를 설정
        videoView.start(); // 비디오 실행
    }
}

----------------------------

----------------------------

AndroidManifest.xml

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

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:usesCleartextTraffic="true"> <!-- 이 코드가 있어야 http 주소를 불러옴 -->
        <activity android:name=".MainActivity"
            android:screenOrientation="landscape"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

----------------------------

BroadCastReceiver

와이파이 인터넷 네트워크 체크할 때 주로 사용하는 4대 컴포넌트 중에 하나

textStyle

bold - 굵게

italic - 기울기를 주는 글씨체

normal - 일반 기본 글씨체

Intent의 종류

명시적 Intent

암시적 Intent

Intent 와 IntentFilter의 차이점

Intent - 기능을 가져와 쓰는 것

IntentFilter - Intent와 반대

---------------------------------------

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_state"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="khon"
        android:textSize="30sp"
        android:textColor="#38EFEF"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

---------------------------------------

---------------------------------------

MainActivity.java

package com.example.broadcastreceiver;

import androidx.appcompat.app.AppCompatActivity;

import android.content.IntentFilter;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public static TextView tv_state;
    private NetworkReceiver receiver;

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

        tv_state = findViewById(R.id.tv_state);

        // 브로드 캐스트 리시버 등록
        IntentFilter filter = new IntentFilter();
        receiver = new NetworkReceiver();
        filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        registerReceiver(receiver,filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // 브로드 캐스트 리시버 해제
        unregisterReceiver(receiver);
    }
}

---------------------------------------

java파일 생성

---------------------------------------

NetworkReceiver.java

package com.example.broadcastreceiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.NetworkInfo;
import android.net.wifi.WifiManager;

public class NetworkReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 네트워크 상태 값 받아오기
        if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) {
            NetworkInfo info = (NetworkInfo) intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
            NetworkInfo.DetailedState state = info.getDetailedState();
            if (state == NetworkInfo.DetailedState.CONNECTED) { // 네트워크 연결 상태이면...
                MainActivity.tv_state.setText("네트워크 연결 완료");
            } else if (state == NetworkInfo.DetailedState.DISCONNECTED) { // 네트워크 연결 해제이면...
                MainActivity.tv_state.setText("네트워크 연결 해제");
            }
        }
    }
}

---------------------------------------

---------------------------------------

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.broadcastreceiver">
    
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        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>

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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:textColor="#39D689"
        android:text="khon"/>

    <TextView
        android:id="@+id/tv_2"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="khon01"/>

    <TextView
        android:id="@+id/tv_3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/tv_2"
        android:layout_centerInParent="true"
        android:textSize="20sp"
        android:text="khon"/>

    <TextView
        android:id="@+id/tv_4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:textSize="20sp"
        android:textColor="#39D689"
        android:text="khon"/>

    <TextView
        android:id="@+id/tv_5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:textSize="20sp"
        android:textColor="#39D689"
        android:text="khon"/>

</RelativeLayout>

volley - 서버 통신 관련해서 필요한 라이브러리(전송, 다운로드 관련 라이브러리)

-----------------------------------

AndrioidManifest.xml

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

    <uses-permission android:name="android.permission.INTERNET"/> <!-- 인터넷 권한 설정-->

    <application
        android:usesCleartextTraffic="true"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        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=".RegisterActivity" />
        <activity android:name=".MainActivity">

        </activity>
    </application>

</manifest>

-----------------------------------

-----------------------------------

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:text="Hello World!"
        android:textSize="30sp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="아이디"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView5" />

    <TextView
        android:id="@+id/tv_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="TextView"
        android:textSize="30sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="비밀번호"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tv_id" />

    <TextView
        android:id="@+id/tv_pass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="TextView"
        android:textSize="30sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />

</androidx.constraintlayout.widget.ConstraintLayout>

-----------------------------------

xml 파일 추가

-----------------------------------

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".RegisterActivity">

    <EditText
        android:id="@+id/et_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="200dp"
        android:layout_marginEnd="8dp"
        android:ems="10"
        android:hint="아이디"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/et_pass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:hint="비밀번호"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="@+id/et_id"
        app:layout_constraintStart_toStartOf="@+id/et_id"
        app:layout_constraintTop_toBottomOf="@+id/et_id" />

    <EditText
        android:id="@+id/et_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:hint="이름"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="@+id/et_pass"
        app:layout_constraintStart_toStartOf="@+id/et_pass"
        app:layout_constraintTop_toBottomOf="@+id/et_pass" />

    <EditText
        android:id="@+id/et_age"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:hint="나이"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="@+id/et_name"
        app:layout_constraintStart_toStartOf="@+id/et_name"
        app:layout_constraintTop_toBottomOf="@+id/et_name" />

    <Button
        android:id="@+id/btn_register"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="회원가입"
        app:layout_constraintEnd_toEndOf="@+id/et_age"
        app:layout_constraintStart_toStartOf="@+id/et_age"
        app:layout_constraintTop_toBottomOf="@+id/et_age" />
</androidx.constraintlayout.widget.ConstraintLayout>

-----------------------------------

xml 파일 추가

-----------------------------------

activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LoginActivity">

    <EditText
        android:id="@+id/et_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="200dp"
        android:layout_marginEnd="8dp"
        android:ems="10"
        android:hint="아이디"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/et_pass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="8dp"
        android:ems="10"
        android:hint="비밀번호"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/et_id" />

    <Button
        android:id="@+id/btn_login"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="로그인"
        app:layout_constraintEnd_toEndOf="@+id/et_pass"
        app:layout_constraintStart_toStartOf="@+id/et_pass"
        app:layout_constraintTop_toBottomOf="@+id/et_pass" />

    <Button
        android:id="@+id/btn_register"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="회원가입"
        app:layout_constraintEnd_toEndOf="@+id/btn_login"
        app:layout_constraintStart_toStartOf="@+id/btn_login"
        app:layout_constraintTop_toBottomOf="@+id/btn_login" />
</androidx.constraintlayout.widget.ConstraintLayout>

-----------------------------------

java 파일은

LoginActivity

LoginRequest

MainActivity

RegisterActivity

RegisterRequest 순서로 있어야 함

-----------------------------------

LoginActivity.java

package com.example.registerlogin;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;

import org.json.JSONException;
import org.json.JSONObject;

public class LoginActivity extends AppCompatActivity {
    private EditText et_id, et_pass;
    private Button btn_login, btn_register;

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

        et_id = findViewById(R.id.et_id);
        et_pass = findViewById(R.id.et_pass);

        btn_login = findViewById(R.id.btn_login);
        btn_register = findViewById(R.id.btn_register);

        // 회원가입 버튼 클릭 시 수행
        btn_register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivity(intent);
            }
        });

        btn_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // EditText에 현재 입력 되어있는 값을 가져온다
                String userID = et_id.getText().toString();
                String userPass = et_pass.getText().toString();

                Response.Listener<String> responseLintener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            boolean success = jsonObject.getBoolean("success");
                            if (success) { // 로그인에 성공한 경우
                                String userID = jsonObject.getString("userID");
                                String userPass = jsonObject.getString("userPassword");

                                Toast.makeText(getApplicationContext(), "로그인에 성공하였습니다", Toast.LENGTH_SHORT).show();
                                Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                                intent.putExtra("userID", userID);
                                intent.putExtra("userPass", userPass);
                                startActivity(intent);
                            } else { // 로그인에 성공한 경우
                                Toast.makeText(getApplicationContext(), "로그인에 실패하였습니다", Toast.LENGTH_SHORT).show();
                                return;
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                };
                LoginRequest loginRequest = new LoginRequest(userID, userPass, responseLintener);
                RequestQueue queue = Volley.newRequestQueue(LoginActivity.this);
                queue.add(loginRequest);
            }
        });

    }
}

-----------------------------------

-----------------------------------

LoginRequest

package com.example.registerlogin;

import com.android.volley.AuthFailureError;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;

import java.util.HashMap;
import java.util.Map;

public class LoginRequest extends StringRequest {

    // 서버 URL 설정(php 파일 연동)
    final static private String URL = "http://khon01.dothome.co.kr/Login.php";
    private Map<String, String> map;

    public LoginRequest(String userID, String userPassword, Response.Listener<String> listener) {
        super(Method.POST, URL, listener, null);

        map = new HashMap<>();
        map.put("userID", userID);
        map.put("userPassword", userPassword);
    }

    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        return map;
    }
}

-----------------------------------

-----------------------------------

MainActivity.java

package com.example.registerlogin;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView tv_id, tv_pass;

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

        tv_id = findViewById(R.id.tv_id);
        tv_pass = findViewById(R.id.tv_pass);

        Intent intent = getIntent();
        String userID = intent.getStringExtra("userID");
        String userPass = intent.getStringExtra("userPass");

        tv_id.setText(userID);
        tv_pass.setText(userPass);
    }
}

-----------------------------------

-----------------------------------

RegisterActivity.java

package com.example.registerlogin;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;

import org.json.JSONException;
import org.json.JSONObject;

public class RegisterActivity extends AppCompatActivity {

    private EditText et_id, et_pass, et_name, et_age;
    private Button btn_register;

    @Override
    protected void onCreate(Bundle savedInstanceState) { // 액티비티 시작시 처음으로 실행되는 생명주기
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

        // 아이디 값 찾아주기
        et_id = findViewById(R.id.et_id);
        et_pass = findViewById(R.id.et_pass);
        et_name = findViewById(R.id.et_name);
        et_age = findViewById(R.id.et_age);

        // 회원가입 버튼 클릭 시 수행
        btn_register = findViewById(R.id.btn_register);
        btn_register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // EditText에 현재 입력 되어있는 값을 가져온다
                String userID = et_id.getText().toString();
                String userPass = et_pass.getText().toString();
                String userName = et_name.getText().toString();
                int userAge = Integer.parseInt(et_age.getText().toString());

                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            boolean success = jsonObject.getBoolean("success");
                            if (success) { // 회원등록에 성공한 경우
                                Toast.makeText(getApplicationContext(), "회원 등록에 성공하였습니다", Toast.LENGTH_SHORT).show();
                                Intent intent = new Intent(RegisterActivity.this, LoginActivity.class);
                                startActivity(intent);
                            } else { // 회원등록에 성공한 경우
                                Toast.makeText(getApplicationContext(), "회원 등록에 싪패하였습니다", Toast.LENGTH_SHORT).show();
                                return;
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                };

                // 서버로 Volley를 이용해서 요청을 함
                RegisterRequest registerRequest = new RegisterRequest(userID, userName ,userPass, userAge, responseListener);
                RequestQueue queue = Volley.newRequestQueue(RegisterActivity.this);
                queue.add(registerRequest);

            }
        });
    }
}

-----------------------------------

-----------------------------------

RegisterRequest.java

package com.example.registerlogin;

import com.android.volley.AuthFailureError;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;

import java.util.HashMap;
import java.util.Map;

public class RegisterRequest extends StringRequest {

    // 서버 URL 설정(php 파일 연동)
    final static private String URL = "http://khon01.dothome.co.kr/Register.php";
    private Map<String, String> map;

    public RegisterRequest(String userID, String userPassword, String userName, int userAge, Response.Listener<String> listener) {
        super(Method.POST, URL, listener, null);

        map = new HashMap<>();
        map.put("userID", userID);
        map.put("userPassword", userPassword);
        map.put("userName", userName);
        map.put("userAge", userAge + "");
    }

    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        return map;
    }
}

LinearLayout - 층을 쌓아서 만들어 가는 개념

특징 - 기본적으로 orientation을 지정할 수 있음

orientation을 따로 지정해 주지 않으면 기본값은 horizontal이 됨

vertical(세로 방향) - 부모 태그를 감싸고 있는 LinearLayout은 세로 방향으로 흘러 가자 라는 뜻

horizontal(가로 방향) - 텍스트 뷰를 여려개 놨을 때 표시 되는 값이 가로 방향으로 가자 라는 뜻

match_parent - 부모의 크기 만큼 화면을 지원해라 라는 뜻

wrap_content - LInearLayout이 감싸고 있는 content만큼의 크기로 세로 조절 해라 라는 뜻

width - 가로

heigh - 세로

gravity 기본 값은 left

background - 컬러 코드, 레이아웃의 색상 변경이나 사진을 추가 함

레이아웃이나 특정 위젯의 길이를 지정 해줄때는 dp값을 사용

텍스트 뷰 같이 글짜 크기를 지정 할 때는 sp 사용

textStyle - 기본 값은 normal

----------------------------------

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:background="#A2FFE9"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal">

        <ImageView
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:src="@mipmap/ic_launcher_round"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textColor="#165E7E"
            android:gravity="center"
            android:textSize="30sp"
            android:textStyle="bold|italic"
            android:text="khon"/>

        <ImageView
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:src="@mipmap/ic_launcher_round"/>

    </LinearLayout>

</LinearLayout>

iconfinder - 아이콘 이미지 다운로드하는 곳

우측 gradle 탭 옆에 Design에 들어가서 Palette 밑에 Button 끌어다 옮기기

Component Tree에 text view 삭제

Button 크기 조정 후 text 이름과 width 설정

-------------------------------

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="128dp"
        android:background="@drawable/selector_button"
        android:text="Button"
        android:textColor="#ffffff"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        tools:text="khon" />

    <Button
        android:id="@+id/button2"
        android:layout_width="128dp"
        android:layout_height="129dp"
        android:background="@drawable/selector_button_img"
        android:text=""
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.397" />

</androidx.constraintlayout.widget.ConstraintLayout>

-------------------------------

xml 파일 생성

-------------------------------

selector_button_img.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@drawable/no">

    </item>

    <item android:state_pressed="false" android:drawable="@drawable/mercy">

    </item>
</selector>

-------------------------------

xml 파일 생성

-------------------------------

selector_button.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape>
            <solid android:color="#B0BCFF"/>
            <corners android:radius="10dp"/>
        </shape>
    </item>

    <item android:state_pressed="false">
        <shape>
            <solid android:color="#536DFE"/>
            <corners android:radius="10dp"/>
        </shape>
    </item>
</selector>

-------------------------------

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_comback"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="값을 가져와 주세요"/>

    <Button
        android:id="@+id/btn_go"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="go"/>

</LinearLayout>

--------------------------------

--------------------------------

MainActivity.java

package com.example.comeback;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private TextView tv_comback;
    private Button btn_go;

    private static final int REQUEST_CODE = 777; // 상수 값을 선언 (상수 - 항상 같은 수, 변하지 않을 수)

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

        tv_comback = findViewById(R.id.tv_comback);
        btn_go = findViewById(R.id.btn_go);

        btn_go.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getApplicationContext(), SubActivity.class);
                startActivityForResult(intent, REQUEST_CODE);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            Toast.makeText(getApplicationContext(), "수신 성공", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(getApplicationContext(), "수신 실패", Toast.LENGTH_SHORT).show();
        }

        if (requestCode == REQUEST_CODE) {
            String resultTxt = data.getStringExtra("comback");
            tv_comback.setText(resultTxt);
        }

    }
}

--------------------------------

java 파일 생성

--------------------------------

SubActivity.java

package com.example.comeback;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class SubActivity extends AppCompatActivity {

    private EditText et_comback;
    private Button btn_close;

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

        et_comback  = findViewById(R.id.et_comback);
        btn_close = findViewById(R.id.btn_close);

        btn_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.putExtra("comback", et_comback.getText().toString()); // 입력 폼에 적은 값 담아주기
                setResult(RESULT_OK, intent); // 결과 값 설정
                finish(); // 현재 액티비티 종료
            }
        });
    }
}

--------------------------------

--------------------------------

activity_sub.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".SubActivity">

    <EditText
        android:id="@+id/et_comback"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Main으로 보낼 값을 입력해주세요"/>

    <Button
        android:id="@+id/btn_close"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="종료"/>

</LinearLayout>

--------------------------------

ConstraintLayout - 제약을 두는 레이아웃

아이콘 불러오기

1. drawable 폴더에서 마우스 우클릭

2. new에서 Vector Asset

3. Clip Art에서 이미지 선택

네비게이션 뷰와 프레임 레이아웃 설정

네비게이션 뷰

1. 우측 상단에 Design 탭 클릭

2. 좌측 Palette 있는 검색창에 bottomNavigationView 메인 화면으로 드래그

3. 맨 밑으로 옮기기

프레임 레이아웃

1. 우측 상단에 Design 탭 클릭

2. 좌측 Palette있는 검색창에 FrameLayout 메인 화면으로 드래그

---------------------------

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottomNavi"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:itemIconTint="#CC3A3A"
        app:itemTextColor="#000000"
        app:layout_constraintBottom_toBottomOf="parent"
        app:menu="@menu/bottom_menu"
        tools:layout_editor_absoluteX="1dp" />

    <FrameLayout
        android:id="@+id/main_frame"
        android:layout_width="match_parent"
        android:layout_height="659dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0">

    </FrameLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

---------------------------

xml 파일 생성

---------------------------

farg1.xml

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="1번화면 입니다"
        android:textSize="40sp"/>

</LinearLayout>

같은 xml 파일 4개 생성 후 1번 화면 입니다를 각 번호로 바꾸기

---------------------------

---------------------------

MainActivity.java

package com.example.bottomnavi;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.os.Bundle;
import android.view.MenuItem;

import com.google.android.material.bottomnavigation.BottomNavigationView;

public class MainActivity extends AppCompatActivity {

    private BottomNavigationView bottomNavigationView; // 바텀 네비게이션 뷰
    private FragmentManager fm;
    private FragmentTransaction ft;
    private Frag1 frag1;
    private Frag2 frag2;
    private Frag3 frag3;
    private Frag4 frag4;
    private Frag5 frag5;

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

        bottomNavigationView = findViewById(R.id.bottomNavi);
        bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
                switch (menuItem.getItemId()) {
                    case R.id.action_airplane:
                        setFrag(0);
                        break;
                    case R.id.action_bike:
                        setFrag(1);
                        break;
                    case R.id.action_favorite:
                        setFrag(2);
                        break;
                    case R.id.action_navigation:
                        setFrag(3);
                        break;
                    case R.id.action_policy:
                        setFrag(4);
                        break;

                }
                return true;
            }
        });
        frag1 = new Frag1();
        frag2 = new Frag2();
        frag3 = new Frag3();
        frag4 = new Frag4();
        frag5 = new Frag5();
        setFrag(0); // 첫 fragment 화면을 무엇으로 지정해줄 것인지 선택
    }

    // fragment 교체가 일어나는 실행문
    private void setFrag(int n) {
        fm = getSupportFragmentManager();
        ft = fm.beginTransaction();
        switch (n) {
            case 0:
                ft.replace(R.id.main_frame, frag1);
                ft.commit();
                break;
            case 1:
                ft.replace(R.id.main_frame, frag2);
                ft.commit();
                break;
            case 2:
                ft.replace(R.id.main_frame, frag3);
                ft.commit();
                break;
            case 3:
                ft.replace(R.id.main_frame, frag4);
                ft.commit();
                break;
            case 4:
                ft.replace(R.id.main_frame, frag5);
                ft.commit();
                break;
        }
    }

}

---------------------------

java 파일 생성

---------------------------

Frag1.java

package com.example.bottomnavi;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class Frag1 extends Fragment {

    private View view;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.frag1, container, false);

        return view;
    }
}

같은 자바 파일 4개 생성후 (R.layout.frag1, container, false) 이 부분에 frag1을 각 번호로 바꾸기

---------------------------

1. 구글맵 콘솔 검색

2. Maps SDK for Android 클릭

사용 클릭

3. 좌측에 사용자 인증 정보 클릭

API 및 서비스의 사용자 인증 정보 클릭

사용자 인증 정보 만들기 클릭

API 키 클릭

키 제한 클릭

4. 애플리케이션 제한사항에서 Android 앱 체크

5. Android 앱의 사용량 제한

패키지 이름 설정

- 안드로이드 스튜디오 MainActivity.java 파일에서 패키지 이름을 복사 (package com...... 으로 시작되는 코드)

6. SHA1 지문 추가

CMD 실행 > SHA1 서명 인증키 받는 커맨드 입력

- CMD(명령프롬프트 창)에서 SHA1 서명 인증키 받는 커맨드

"C:\Program Files\Android\Android Studio\jre\bin\keytool" -list -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android

7. API 제한사항에서 키 제한 체크

Maps SDK for Android 선택

8. API Key 복사

9. 저장

10. 메타 데이터 추가

AndroidManifest.xml

<meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="AIzaSyDfqqusA5ZcIevs9TyBCpuRMmJq-uAd-iA"/> // API 키 복사한거 붙여넣기

11. Google Play services 라이브러리 패키지 설치

안드로이드 스튜디오 상단 메유에 Tools 클릭

SDK Manager 클릭

SDK Tools 에서 Google Play services 체크 후 Apply 클릭하고 설치

------------------------------------

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <fragment
        android:id="@+id/googlemap"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.MapFragment"/>

</LinearLayout>

------------------------------------

------------------------------------

MainActivity.java

package com.example.googlemap;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;


import android.app.FragmentManager;
import android.os.Bundle;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {

    private FragmentManager fragmentManager;
    private MapFragment mapFragment;


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

        fragmentManager = getFragmentManager();
        mapFragment = (MapFragment)fragmentManager.findFragmentById(R.id.googlemap);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        LatLng location = new LatLng(46.057171, 14.505591); // 류블랴나
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.title("류블랴나");
        markerOptions.snippet("해외");
        markerOptions.position(location);
        googleMap.addMarker(markerOptions);

        // googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(location, 16));
        googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(location, 16));
    }
}

------------------------------------

------------------------------------

AndroidManifest.xml

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        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>

        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="AIzaSyDfqqusA5ZcIevs9TyBCpuRMmJq-uAd-iA"/>

    </application>

</manifest>

------------------------------------

------------------------------------

build.gradle (:app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.1"

    defaultConfig {
        applicationId "com.example.googlemap"
        minSdkVersion 28
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.google.android.gms:play-services-location:17.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

}

MainActivity.java

package com.example.backbutton;

import android.os.Bundle;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    /* back 버튼을 눌렀을때 타임을 0으로 설정
    long은 int보다 자료 데이터가 더 긴 형태 */
    private long backBtnTime = 0;

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

    /* super.onBackPressed를 타게 되면 실제로 back 버튼을 눌렀을때 super.onBackPressed에 의해서
    뒤로가기 활성화가 됨 */
    @Override
    public void onBackPressed() {
        long cutTime = System.currentTimeMillis();
        long gapTime = cutTime - backBtnTime; // 현재 시간을 가져와서 back 버튼을 누른 시간을 빼줌

        // 0이 gatTime보다 작거나 같고 gapTime이 2000(mil)보다 작거나 같을때
        if (0 <= gapTime && 2000 >= gapTime) {
            super.onBackPressed();
        }
        // 만약 저 경우의 수가 아니라면 backbBtnTime은 현재시간으로 됨
        else {
            backBtnTime = cutTime;
            Toast.makeText(this, "한번 더 누르면 종료 됩니다.", Toast.LENGTH_SHORT).show();
        }
    }
}