Android) 버튼 추가해보기

new project : hello02

수정 : activity_main.xml 

수정 : MainActivity.java

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만들화면

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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:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onButtonClicked"
        android:text="버튼을 클릭하면 메시지가 출력 된다"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintHorizontal_bias="0.577"
        app:layout_constraintVertical_bias="0.306" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onButtonClicked2"
        android:text="네이버"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintVertical_bias="0.423" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onButtonClicked3"
        android:text="내 사이트"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintVertical_bias="0.525"/>

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onButtonClicked4"
        android:text="전화걸기"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintVertical_bias="0.627"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.example.hello02;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
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);
    }//method-end

    //method-add
    public void onButtonClicked(View v){
        Toast.makeText(getApplicationContext(), "버튼 눌러서 나온 메시지 입니다", Toast.LENGTH_LONG).show();
    }//method-end

    //method-add
    public void onButtonClicked2(View v){
        Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://naver.com"));
        startActivity(myIntent);
    }//method-end

    //method-add
    public void onButtonClicked3(View v){
        Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://192.168.0.00:9000/MVC/board/list"));
        startActivity(myIntent);
    }//method-end

    //method-add
    public void onButtonClicked4(View v){
        Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("tel:010-1234-5678"));
        startActivity(myIntent);
    }//method-end


}

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