안드로이드 스튜디오 그래픽

자바 좌표 시스템

 

 

백그라운드 컬러 변경 (버튼 클릭)

<?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"
    android:id="@+id/main">


    <Button
        android:id="@+id/red"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="red"
        android:textColor="#ff0000"
        android:textSize="20dp"
        android:onClick="click"/>

    <Button
        android:id="@+id/blue"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="blue"
        android:textColor="#0000ff"
        android:textSize="20dp"
        android:onClick="click"/>

    <Button
        android:id="@+id/yellow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="yellow"
        android:textColor="#ffff00"
        android:textSize="20dp"
        android:onClick="click"/>
</LinearLayout>

package com.example.graphic;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Bundle;
import android.text.Layout;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;

import java.security.acl.LastOwnerException;

public class MainActivity extends AppCompatActivity {
    LinearLayout main;

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

    public void click(View view) {
        switch (view.getId()){
            case R.id.red:
                main.setBackgroundColor(Color.rgb(255,0,0));
                break;
            case R.id.blue:
                main.setBackgroundColor(Color.rgb(0,0,255));
                break;
            case R.id.yellow:
                main.setBackgroundColor(Color.rgb(255,255,0));
                break;
        }

    }
}

백그라운드 컬러 변경 (라디오 버튼)

 

<?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"
    android:id="@+id/main">

    <RadioGroup
        android:id="@+id/group"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#ffffff"
        android:layout_margin="5dp">

        <RadioButton
            android:id="@+id/red"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="RED"
            android:textSize="20dp"
            />

        <RadioButton
            android:id="@+id/green"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="GREEN"
            android:textSize="20dp"/>

        <RadioButton
            android:id="@+id/blue"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="BLUE"
            android:textSize="20dp"/>
    </RadioGroup>
</LinearLayout>

package com.example.graphic_radio;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.RadioGroup;

public class MainActivity extends AppCompatActivity {
    LinearLayout layout;
    RadioGroup radioGroup;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        layout = findViewById(R.id.main); //layout id 확인
        radioGroup = findViewById(R.id.group);
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId){
                    case R.id.red:
                        layout.setBackgroundColor(Color.RED);
                        break;
                    case R.id.green:
                        layout.setBackgroundColor(Color.GREEN);
                        break;
                    case R.id.blue:
                        layout.setBackgroundColor(Color.BLUE);
                        break;
                }
            }
        });
    }
}

 

 

백그라운드 컬러 변경 (optin menu)

2020/04/25 - [안드로이드 스튜디오] - 안드로이드 스튜디오 메뉴 설정 참고 해서 리소스 파일 생성

 

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

    <item android:title="RED"
        android:id="@+id/red"
        android:icon="@drawable/ic_launcher_background"/>

    <item android:title="GREEN"
        android:id="@+id/green"
        android:icon="@drawable/ic_launcher_background"/>

    <item android:title="BLUE"
        android:id="@+id/blue"
        android:icon="@drawable/ic_launcher_background"/>
</menu>

package com.example.graphic_radio;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.LinearLayout;
import android.widget.RadioGroup;

public class MainActivity extends AppCompatActivity {
    LinearLayout layout;

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = new MenuInflater(this);
        inflater.inflate(R.menu.mymenu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.red:
                layout.setBackgroundColor(Color.rgb(255, 0, 0));
                return true;
            case R.id.green:
                layout.setBackgroundColor(Color.rgb(0, 255, 0));
                return true;
            case R.id.blue:
                layout.setBackgroundColor(Color.rgb(0, 0, 255));
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}