[41일차 Android] ActionBar Navigation

 

 

 

출처 : 안드로이드 앱스쿨 2기 윤재성 강사님 수업 PPT

 

 

 

📖 ActionBar Navigation

• ActionBar에 아이콘을 배치하여 뒤로가기 기능을 구현할 수 있다.
• 아이콘을 표시한다고 해서 뒤로 가기 기능이 생기는 것은 아니기 때문에 직접 구현을 해야한다.

 

예제 코드

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"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="MainActivity"
        android:textAppearance="@style/TextAppearance.AppCompat.Large" />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="SecondActivity 실행" />
</LinearLayout>

 

 

 

activity_second.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"
    android:orientation="vertical"
    tools:context=".SecondActivity">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="SecondActivity"
        android:textAppearance="@style/TextAppearance.AppCompat.Large" />
</LinearLayout>

 

 

 

MainActivity.kt

class MainActivity : AppCompatActivity() {

    lateinit var activityMainBinding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        activityMainBinding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(activityMainBinding.root)

        activityMainBinding.run{
            button.setOnClickListener {
                val newIntent = Intent(this@MainActivity, SecondActivity::class.java)
                startActivity(newIntent)
            }
        }
    }
}

 

 

 

SecondActivity.kt

class SecondActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_second)

        // Homebutton 활성화
        supportActionBar?.setHomeButtonEnabled(true)
        // HomeButton 노출
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
        // 아이콘 변경
        // supportActionBar?.setHomeAsUpIndicator(R.mipmap.ic_launcher)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {

        when(item.itemId){
            android.R.id.home -> {
                // 현재 Activity 종료
                finish()
            }
        }

        return super.onOptionsItemSelected(item)
    }
}

 

 

 

결과