Android 프로그래밍 2

1. 새 프로젝트 생성

프로젝트명 : FlashLightTest2

2. 화면 디자인 수정

<?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:gravity="center"
    android:orientation="vertical">

    <ToggleButton
        android:id="@+id/onOffFlashlight"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textOn="Turn Off"
        android:textOff="Turn On"
        android:checked="false"
        android:text="Turn On/Off Camera LED/ Flashlight Android" />
</LinearLayout>

3. MainActivity.kt 수정

package kr.co.leelab.flashlighttest2

import android.app.AlertDialog
import android.content.Context
import android.content.DialogInterface
import android.content.pm.PackageManager
import android.hardware.camera2.CameraAccessException
import android.hardware.camera2.CameraManager
import android.os.Build
import android.os.Bundle
import android.widget.CompoundButton
import android.widget.ToggleButton
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
    private var mCameraManager: CameraManager? = null
    private var mCameraId: String? = null
    private var toggleButton: ToggleButton? = null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val isFlashAvailable = applicationContext.packageManager
                .hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)

        if (!isFlashAvailable) {
            showNoFlashError()
        }

        mCameraManager = getSystemService(Context.CAMERA_SERVICE) as CameraManager
        try {
            mCameraId = mCameraManager!!.getCameraIdList()[0]
        } catch (e: CameraAccessException) {
            e.printStackTrace()
        }

        toggleButton = findViewById(R.id.onOffFlashlight)
        toggleButton!!.setOnCheckedChangeListener(CompoundButton.OnCheckedChangeListener {
            buttonView, isChecked ->
            switchFlashLight(isChecked)
        })
    }

    fun showNoFlashError() {
        val alert: AlertDialog = AlertDialog.Builder(this)
                .create()
        alert.setTitle("Oops!")
        alert.setMessage("Flash not available in this device...")
        alert.setButton(DialogInterface.BUTTON_POSITIVE, "OK", DialogInterface.OnClickListener { dialog, which -> finish() })
        alert.show()
    }

    fun switchFlashLight(status: Boolean) {
        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                mCameraManager!!.setTorchMode(mCameraId!!, status)
            }
        } catch (e: CameraAccessException) {
            e.printStackTrace()
        }
    }
}
 

4. 권한설정

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="kr.co.leelab.flashlighttest2">
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera.flash" />
    <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