Android) LinearLayout(리니어레이아웃)

new project : hello03_LinearLayout

 

수정 : activity_main.xml

수정 : MainActivity.java

추가 : SampleLayoutCodeActivity.java

추가 : AndroidManifest.xml

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만들 화면

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activity_main.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:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:orientation="vertical"
    >
<!--
android:orientation="vertical": 위젯을 수직(vertical)으로 배치
android:orientation="horizontal": 위젯을 수평(horizontal)으로 배치
-->
    <!--
    Button 01 ~ 06
    -->
    <Button
        android:id="@+id/button07"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"

        android:text="gravity : center_vertical|center_horizontal"
        android:textSize="14dp"
        android:textStyle="bold"

        android:onClick="onButtonClicked7"
        />

    <Button
        android:id="@+id/button08"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"

        android:text="자바코드로 만들기"
        android:textSize="14dp"
        android:textStyle="bold"

        android:onClick="onButtonClicked8"
        />

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

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:text="오른쪽"
            />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="중앙"
            />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="left"
            android:text="왼쪽"
            />
    </LinearLayout>
</LinearLayout>

*LinearLayout사이에 View 위젯들을 선언하는 것만으로, 가로 방향 한줄로 나열된 View 위젯들을 확인할 수 있다.

android:layout_gravity="" : 문자열정렬
android:layout_gravity="center_horizontal" : 가운데로
android:layout_marginTop="10dp" : 위쪽마진
android:textStyle="bold" : 텍스트 굵기
android:backgroundTint="@color/teal_200" : 텍스트 배경색

---

<!--activity_main.xml 버튼01~06-->

<Button
        android:id="@+id/button01"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        android:text="일반적인 경우"
        android:textStyle="bold"
        android:backgroundTint="@color/teal_200"
        android:onClick="onButtonClicked"
        />

    <Button
        android:id="@+id/button02"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"

        android:text="padding 사용하기"
        android:textSize="16dp"
        android:textStyle="bold"

        android:onClick="onButtonClicked2"
        />

    <Button
        android:id="@+id/button03"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"

        android:text="gravity 사용하기"
        android:textSize="16dp"
        android:textStyle="bold"

        android:onClick="onButtonClicked3"
        />

    <Button
        android:id="@+id/button04"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"

        android:text="weight 사용하기"
        android:textSize="16dp"
        android:textStyle="bold"
        android:textColor="@color/purple_200"
        android:background="#111A4C"

        android:onClick="onButtonClicked4"
        />

    <Button
        android:id="@+id/button05"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"

        android:text="baseline 사용하기"
        android:textSize="16dp"
        android:textStyle="bold"

        android:onClick="onButtonClicked5"
        />

    <Button
        android:id="@+id/button06"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"

        android:text="gravity : left|top"
        android:textSize="14dp"
        android:textStyle="bold"

        android:onClick="onButtonClicked6"
        />

---

MainActivity.java

package com.example.hello03_linearlayout;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

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

    //method-add
    public void onButtonClicked2(View v){
        //setContentView(R.layout);
    }

    //method-add
    public void onButtonClicked8(View v){
        Intent intent = new Intent(getApplicationContext(),SampleLayoutCodeActivity.class);
        startActivity(intent);
    }
}

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SampleLayoutCodeActivity.java

package com.example.hello03_linearlayout;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.LinearLayout;

import androidx.appcompat.app.AppCompatActivity;

public class SampleLayoutCodeActivity extends Activity {
    //자바코드로 버튼만들기
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout mainlayout = new LinearLayout(this);//LinearLayout 객체생성
        mainlayout.setOrientation(LinearLayout.VERTICAL);//위젯을 수직으로 배치
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                //매개변수 MATCH_PARENT 부모랑 맞춤, WRAP_CONTENT 자기자신에 맞춤
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT
        );

        Button button1 = new Button(this);//버튼생성
        button1.setText("button 01");
        button1.setLayoutParams(params);
        mainlayout.addView(button1);

        Button button2 = new Button(this);//버튼생성
        button2.setText("button 02");
        button2.setLayoutParams(params);
        mainlayout.addView(button2);

        setContentView(mainlayout);

    }
}

---

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.hello03_linearlayout">

    <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/Theme.Hello03_LinearLayout">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

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