Today I Learned

오늘은 앞선 콘텐츠 프로바이더에서 배운 내용을 직접 실습해보려 한다.

실습 - 카메라 / 갤러리 앱 연동

갤러리앱, 카메라 앱과 연동해서 앱의 프로필 사진을 교체하는 기능을 구현해보려 한다. 갤러리 앱의 사진 목록에서 사진을 선택하거나, 카메라로 촬영한 사진을 바로 프로필 사진으로 출력하는 앱이다.

실행 결과

• 메인 화면
  

• 갤러리 앱 버튼 클릭시 갤러리에서 사진 셀렉하면 바로 프로필 사진으로 등록됨
  
  

• 카메라 앱 버튼 클릭시 카메라 어플 켜지고 찍으면 바로 프로필 사진으로 등록 됨

코드 구현

• AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.READ_CONTACTS"/>

    <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.AndroidLab">
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.example.ch16_provider.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths"></meta-data>
        </provider>

        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:label="@string/app_name"
            android:theme="@style/Theme.AndroidLab">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

• MainActivity.kt

class MainActivity : AppCompatActivity() {

    lateinit var binding: ActivityMainBinding
    lateinit var filePath: String

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

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

        //gallery request launcher
        val requestGalleryLauncher = registerForActivityResult(
            ActivityResultContracts.StartActivityForResult())
        {
            try {
                val calRatio = calculateInSampleSize(
                    it.data!!.data!!,
                    resources.getDimensionPixelSize(R.dimen.imgSize),
                    resources.getDimensionPixelSize(R.dimen.imgSize)
                )
                val option = BitmapFactory.Options()
                option.inSampleSize = calRatio

                var inputStream = contentResolver.openInputStream(it.data!!.data!!)
                val bitmap = BitmapFactory.decodeStream(inputStream, null, option)
                inputStream!!.close()
                inputStream = null

                bitmap?.let {
                    binding.userImageView.setImageBitmap(bitmap)
                } ?: let{
                    Log.d("event", "bitmap null")
                }
            }catch (e: Exception){
                e.printStackTrace()
            }
        }


        binding.galleryButton.setOnClickListener {
            //gallery app........................
            val intent = Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
            intent.type = "image/*"
            requestGalleryLauncher.launch(intent)
        }

        //camera request launcher.................
        val requestCameraFileLauncher = registerForActivityResult(
            ActivityResultContracts.StartActivityForResult()){
            val calRatio = calculateInSampleSize(
                Uri.fromFile(File(filePath)),
                resources.getDimensionPixelSize(R.dimen.imgSize),
                resources.getDimensionPixelSize(R.dimen.imgSize)
            )
            val option = BitmapFactory.Options()
            option.inSampleSize = calRatio
            val bitmap = BitmapFactory.decodeFile(filePath, option)
            bitmap?.let {
                binding.userImageView.setImageBitmap(bitmap)
            }
        }


        binding.cameraButton.setOnClickListener {
            //camera app
            //파일 준비
            val timeStamp: String =
                SimpleDateFormat("yyyyMMdd_HHmmss").format(Date())
            val storageDir: File? = getExternalFilesDir(Environment.DIRECTORY_PICTURES)
            val file = File.createTempFile(
                "JPEG_${timeStamp}_",
                ".jpg",
                storageDir
            )
            filePath = file.absolutePath
            val photoURI: Uri = FileProvider.getUriForFile(
                this,
                "com.example.ch16_provider.fileprovider",
                file
            )
            val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
            intent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI)
            requestCameraFileLauncher.launch(intent)

        }
    }

    private fun calculateInSampleSize(fileUri: Uri, reqWidth: Int, reqHeight: Int): Int {
        val options = BitmapFactory.Options()
        options.inJustDecodeBounds = true
        try {
            var inputStream = contentResolver.openInputStream(fileUri)

            //inJustDecodeBounds 값을 true로 설정한 상태에서 decodeXXX() 를 호출
            //로딩 하고자 하는 이미지의 각종 정보가 options 에 설정
            BitmapFactory.decodeStream(inputStream, null, options)
            inputStream!!.close()
            inputStream = null
        } catch (e: Exception) {
            e.printStackTrace()
        }
        //비율 계산
        val (height: Int, width: Int) = options.run { outHeight to outWidth }
        var inSampleSize = 1
        //inSampleSize 비율 계산
        if (height > reqHeight || width > reqWidth) {

            val halfHeight: Int = height / 2
            val halfWidth: Int = width / 2

            while (halfHeight / inSampleSize >= reqHeight && halfWidth / inSampleSize >= reqWidth) {
                inSampleSize *= 2
            }
        }
        return inSampleSize
    }

}

• 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"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:gravity="center">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="프로필 사진 교체"
        android:textStyle="bold"
        android:layout_marginBottom="24dp"/>

    <androidx.cardview.widget.CardView
        android:layout_width="150dp"
        android:layout_height="150dp"
        app:cardCornerRadius="75dp"
        app:cardElevation="0dp"
        >
        <ImageView
            android:id="@+id/userImageView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/user_basic"
            android:scaleType="centerCrop"
            />
    </androidx.cardview.widget.CardView>

    <Button
        android:id="@+id/galleryButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Gallery App"
        android:layout_marginTop="24dp"/>
    <Button
        android:id="@+id/cameraButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Camera App"
        android:layout_marginTop="24dp"/>

</LinearLayout>

• xml/file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="myfiles"
        path="Android/data/com.example.ch16_provider/files/Pictures"/>
</paths>