갤러리에서 Image 받아와 ImageView에 적용 예제

public class MainActivity extends AppCompatActivity {

    ImageView pic;
    Button callBtn, uploadBtn;
    private int PICK_IMAGE_REQUEST = 1;
    private String TAG = "uploadActicity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initialSetting();
    }

    public void initialSetting() {
        pic = findViewById(R.id.iv_pic);
        callBtn = findViewById(R.id.btn_callPic);
        uploadBtn = findViewById(R.id.btn_uploadPic);
    }

    public void callImage(View v) {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "사진을 선택하세요"), PICK_IMAGE_REQUEST);
    }

    public void uploadImage(View v) {
        // Upload image with lon library
    }

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

        if(requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
            Uri uri = data.getData();

            try {
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
                Log.d(TAG, String.valueOf(bitmap));

                pic.setImageBitmap(bitmap);
            } catch(IOException e) {
                e.printStackTrace();
            }
        }
    }
}