• 목록

카메라 Flashlight를 켜고 끄는 예제를 만들어 보겠습니다.

1. 새프로젝트 생성

프로젝트명 : FlashLightTest

2. 화면 디자인 수정

activity_main.xml 을 수정합니다.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <Button
        android:id="@+id/btnOn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="FLASH ON" />
    <Button
        android:id="@+id/btnOff"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="FLASH OFF" />
</LinearLayout>
 

3. MainActivity.kt 수정

package kr.co.leelab.flashlighttest

import android.content.Context
import android.hardware.Camera
import android.hardware.camera2.CameraAccessException
import android.hardware.camera2.CameraManager
import android.os.Build
import android.os.Bundle
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    private val TAG = "My_TAG"
    private var mCamera: Camera? = null
    private var parm: Camera.Parameters? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        // 카메라 플래시라이트 켜기
        btnOn.setOnClickListener {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                val camManager = getSystemService(Context.CAMERA_SERVICE) as CameraManager
                var cameraId: String? = null
                try {
                    if (camManager != null) {
                        cameraId = camManager.cameraIdList[0]
                        camManager.setTorchMode(cameraId, true) //Turn ON
                    }
                } catch (e: CameraAccessException) {
                    Log.e(TAG, e.toString());
                }
            } else {
                mCamera = Camera.open()
                parm = mCamera!!.parameters
                parm!!.flashMode = Camera.Parameters.FLASH_MODE_TORCH
                mCamera!!.parameters = parm
                mCamera!!.startPreview()
            }
        }
        // 카메라 플래시라이트 끄기
        btnOff.setOnClickListener {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                val camManager = getSystemService(Context.CAMERA_SERVICE) as CameraManager
                var cameraId: String? = null
                try {
                    if (camManager != null) {
                        cameraId = camManager.cameraIdList[0]
                        camManager.setTorchMode(cameraId!!, false) //Turn OFF
                    }
                } catch (e: CameraAccessException) {
                    Log.e(TAG, e.toString());
                }
            } else {
                mCamera = Camera.open();
                parm = mCamera!!.parameters
                parm!!.flashMode = Camera.Parameters.FLASH_MODE_OFF
                mCamera!!.parameters = parm
                mCamera!!.stopPreview()
            }
        }
    }
    override fun onStop() {
        super.onStop()
        if (mCamera != null) {
            mCamera!!.release()
        }
    }

}

4. 권한 설정

AndroidManifest.xml 파일을 수정합니다.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="kr.co.leelab.flashlighttest">
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-permission android:name="android.permission.FLASHLIGHT"/>

    <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/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

5. 실행

실제 휴대폰을 연결하고, 실행해보겠습니다.

휴대폰을 연결하면 아래와 같이 모델이 보이게 되면 선택합니다. 

실행버튼을 눌러 실행합다.