Android Studio 6일차

자바 코드로 메뉴 만들어 보기

 

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;

import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    Button bt1;
    ConstraintLayout cl;
    int sum = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("배경색 바꾸기");
        cl = findViewById(R.id.baseLayout);
        bt1 = findViewById(R.id.button);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        // 그룹으로 최상위, 각 메뉴별 아이디, 순서.
        menu.add(0, 1, 2, "배경색 (빨강)");
        menu.add(0, 2, 1, "배경색 (초록)");
        menu.add(0, 3, 0, "배경색 (파랑)");
        SubMenu sMenu = menu.addSubMenu("버튼 변경 >>");
        sMenu.add(1, 4, 0, "버튼 45 도 회전");
        sMenu.add(1, 5, 0, "버튼 2 배 확대");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case 1:
                cl.setBackgroundColor(Color.RED);
                return true;
            case 2:
                cl.setBackgroundColor(Color.GREEN);
                return true;
            case 3:
                cl.setBackgroundColor(Color.BLUE);
                return true;
            case 4:
                sum += 45;
                bt1.setRotation(sum);
                return true;
            case 5:
                bt1.setScaleX(2);
                return true;
        }
        return false;
    }
}

 

토스트를 입맛에 맞춰서 변형해 보기.

 

package com.example.test12;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;

import android.graphics.Color;
import android.os.Bundle;
import android.view.Display;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("토스트 연습");
        Button bt = findViewById(R.id.button);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast tMsg = Toast.makeText(MainActivity.this, "토스트 연습",
                        Toast.LENGTH_SHORT);
                Display display = ((WindowManager)
                        getSystemService(WINDOW_SERVICE))
                        .getDefaultDisplay();
                int xOffset = (int) (Math.random() * display.getWidth());
                int yOffset = (int) (Math.random() * display.getHeight());
                tMsg.setGravity(Gravity.TOP | Gravity.LEFT, xOffset,
                        yOffset);
                tMsg.show();
                // 안드로이드는 다양한 버전과, 액정 크기를 가지고 있음.
                // 그러므로, 동일한 코드라도 동일한 결과를 보여주지 않을 수 있음.
            }
        });
    }
}

 

dialog

package com.example.test12;

import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt = findViewById(R.id.button);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder dlg = new AlertDialog.Builder(
                        MainActivity.this);
                dlg.setTitle("제목입니다");
                dlg.setMessage("이곳이 내용입니다");
                dlg.setIcon(R.mipmap.ic_launcher);
                dlg.setPositiveButton("확인", null);
                dlg.show();
                // 확인, 취소 버튼의 보여주기 순서 변경은 조금더 확인후 다시 안내
                하겠습니다.
            }

 

안내창에 목록 띄우기

package com.example.test12;

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt = findViewById(R.id.button);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final String[] versionArray = new String[]{"파이", "큐(10)",
                        "알(11)"};
                AlertDialog.Builder dlg = new
                        AlertDialog.Builder(MainActivity.this);
                dlg.setTitle("좋아하는 버전은?");
                dlg.setIcon(R.mipmap.ic_launcher);
                dlg.setItems(versionArray,
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int
                                    which) {
                                bt.setText(versionArray[which]);
                            }
                        });
                dlg.setPositiveButton("닫기", null);
                dlg.show();
            }
        });
    }
}

 

사용자 안내창 만들기.

<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:id="@+id/baseLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".MainActivity">
<TextView
 android:id="@+id/tvName"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:gravity="center"
         android:layout_gravity="center"
         android:text="" />
<TextView
 android:id="@+id/tvEmail"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:gravity="center"
         android:layout_gravity="center"
         android:text="" />
<Button
 android:id="@+id/button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:gravity="center"
         android:layout_gravity="center"
         android:text="alert show"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
<TextView
 android:id="@+id/textView2"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:textSize="20dp"
         android:text="사용자 이름" />
<EditText
 android:id="@+id/dlgEdt1"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:ems="10"
         android:inputType="textPersonName"
         android:text="" />
<TextView
 android:id="@+id/textView3"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:textSize="20dp"
         android:text="이메일" />
<EditText
 android:id="@+id/dlgEdt2"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:ems="10"
         android:inputType="textEmailAddress"
         android:text="" />
</LinearLayout>

<?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"
        android:orientation="horizontal"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
<ImageView
 android:id="@+id/imageView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         app:srcCompat="@android:drawable/btn_star_big_on" />
<TextView
 android:id="@+id/toastText1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:textSize="20dp"
         android:text="TextView" />
<ImageView
 android:id="@+id/imageView2"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         app:srcCompat="@android:drawable/btn_star_big_on" />
</LinearLayout>

MainActivity

package com.example.test13;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
    TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt=findViewById(R.id.button);
        TextView tvName = findViewById(R.id.tvName);
        TextView tvEmail = findViewById(R.id.tvEmail);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                View dialogView = (View) View.inflate(MainActivity.this,
                        R.layout.dialog1, null);
                AlertDialog.Builder dlg = new AlertDialog.Builder(
                        MainActivity.this);
                dlg.setTitle("사용자 정보 입력");
                dlg.setIcon(R.drawable.ic_launcher_foreground);
                dlg.setView(dialogView);
                dlg.setPositiveButton("취소",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                                int which) {
                                Toast toast = new Toast(MainActivity.this);
                                View toastView = (View) View.inflate(
                                        MainActivity.this,
                                        R.layout.toast1, null);
                                TextView toastText = toastView
                                        .findViewById(R.id.toastText1);
                                toastText.setText("취소했습니다");
                                toast.setView(toastView);
                                toast.show();
                            }
                        });// positive_event
                dlg.setNegativeButton("확인",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                                int which) {
                                EditText dlgEdtName = dialogView
                                        .findViewById(R.id.dlgEdt1);
                                EditText dlgEdtEmail = dialogView
                                        .findViewById(R.id.dlgEdt2);
                                tvName.setText(dlgEdtName.getText().toString());
                                tvEmail.setText(dlgEdtEmail.getText()
                                        .toString());
                            }
                        });// negative_event
                dlg.show();
            }
        });// bt_click
    }
}