[ Android ] 임시 파일 생성해서 외부 앱으로 찍은 사진 받기

 

 

resolveActivity()

takePictureIntent.resolveActivity(getPackageManager())

결과가 null이 아닌 경우, 인텐트를 처리할 수 있는 앱이 최소한 하나는 있다는 뜻이며 startActivity()를 호출해도 안전합니다. 결과가 null이면 해당 인텐트를 사용해서는 안 되고, 가능하면 해당 인텐트를 호출하는 기능을 비활성화해야 합니다.

 

 

 Code

 

        <provider
            android:authorities="${applicationId}.provider"
            android:name="androidx.core.content.FileProvider"
            android:grantUriPermissions="true"
            android:exported="false">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/filepaths"/>
        </provider>

 

<paths>
    <external-path
        name="images"
        path="."/>
</paths>

 

public class ReportCameraActivity extends AppCompatActivity {
    private File filePath;
    private ImageView resultView;

    private String currentPhotoPath;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_report_camera);

        resultView = findViewById(R.id.resultImageView);
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED) {

            filePath = dispatchTakePictureIntent();
        }
    }

    private File dispatchTakePictureIntent() {
        Uri photoURI;

        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            // Create the File where the photo should go
            File photoFile = null;
            try {
                photoFile = createImageFile();
            } catch (IOException ex) {
                // Error occurred while creating the File
            }

            // Continue only if the File was successfully created
            if (photoFile != null) {
                photoURI = FileProvider.getUriForFile(Objects.requireNonNull(getApplicationContext()),
                        BuildConfig.APPLICATION_ID+".provider",
                        photoFile);
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);

                startActivityForResult(takePictureIntent, Constants.CAMERA_REQUEST_CODE);
            }

            return photoFile;
        }

        return null;
    }

    private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );

        return image;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == Constants.CAMERA_REQUEST_CODE && resultCode == RESULT_OK) {
            /**
             * 이미지의 크기와 프로그램에서 사용하려는 이미지 크기를 비교해서 비율을 동적으로 결정
             **/
            if (filePath != null) {
                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inJustDecodeBounds = true;
                try {
                    InputStream in = new FileInputStream(filePath);
                    BitmapFactory.decodeStream(in, null, options);
                    in.close();
                    in = null;
                } catch ( Exception e ) {
                    e.printStackTrace();
                }

                final int width = options.outWidth;
                final int height = options.outHeight;
                int inSampleSize = 1;

                final int repWidth = 300;
                final int reqHeight = 300;

                // width, height 값에 따라 inSaampleSize 값 계산
                if (height > reqHeight || width > repWidth) {
                    final int heightRatio = Math.round((float) height/(float)reqHeight);
                    final int widthRatio = Math.round((float) height/(float)repWidth);
                    inSampleSize = (heightRatio < widthRatio)? heightRatio : widthRatio;
                }

                BitmapFactory.Options imgOptions = new BitmapFactory.Options();
                imgOptions.inSampleSize = inSampleSize;
                Bitmap bitmap = BitmapFactory
                        .decodeFile(filePath.getAbsolutePath(), imgOptions);
                resultView.setImageBitmap(bitmap);
            }
        }
    }
}

 

 

출처

1. 사진 촬영

2. 파일 공유 설정

3. 큰 비트맵을 효율적으로 로드