사진을 찍던, 갤러리에 보관이 되던 썸네일은 항상 internal 에 보관이 되어있습니다.
리스트에서 사용을 앱의 성능 향상을 위해서는 썸네일을 쓰는 것이 좋습니다.
코드 사용
xml 코드
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="갤러리 호출"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="16dp" />
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/ic_launcher"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
java 코드
public class MainActivity extends AppCompatActivity {
private static final int PICK_FROM_ALBUM = 1;
ImageView imageView;
//권한 추가
private static final int REQUEST_PERMISSIONS = 1;
private static final String[] MY_PERMISSIONS = {
Manifest.permission.READ_EXTERNAL_STORAGE
};
public boolean hasAllPermissionsGranted() {
for (String permission : MY_PERMISSIONS) {
if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, MY_PERMISSIONS, REQUEST_PERMISSIONS);
return false;
}
}
return true;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == REQUEST_PERMISSIONS) {
int index = 0;
for (String permission : permissions) {
if(permission.equalsIgnoreCase(Manifest.permission.READ_EXTERNAL_STORAGE) && grantResults[index] == PackageManager.PERMISSION_GRANTED) {
getGalley();
break;
}
index++;
}
return;
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView);
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
boolean permission = hasAllPermissionsGranted();
Log.e("test","permission : "+permission);
if(!permission)
return;
}
getGalley();
}
});
}
private void getGalley() {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType(MediaStore.Images.Media.CONTENT_TYPE);
startActivityForResult(intent, PICK_FROM_ALBUM);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_FROM_ALBUM) {
if (resultCode == Activity.RESULT_OK) {
Log.d("test","data : "+data);
if(data != null) {
Uri returnImg = data.getData();
if("com.google.android.apps.photos.contentprovider".equals(returnImg.getAuthority())) {
for(int i=0;i<returnImg.getPathSegments().size();i++) {
String temp = returnImg.getPathSegments().get(i);
if(temp.startsWith("content://")) {
returnImg = Uri.parse(temp);
break;
}
}
}
// 썸네일 가져오기
Bitmap bm = getThumbNail(returnImg);
imageView.setImageBitmap(bm);
}
}
}
}
private Bitmap getThumbNail(Uri uri) {
Log.d("test","from uri : "+uri);
String[] filePathColumn = {MediaStore.Images.Media._ID, MediaStore.Images.Media.DATA, MediaStore.Images.Media.TITLE/*, MediaStore.Images.Media.ORIENTATION*/};
ContentResolver cor = getContentResolver();
//content 프로토콜로 리턴되기 때문에 실제 파일의 위치로 변환한다.
Cursor cursor = cor.query(uri, filePathColumn, null, null, null);
Bitmap thumbnail = null;
if(cursor != null) {
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
long ImageId = cursor.getLong(columnIndex);
if(ImageId != 0) {
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
thumbnail = MediaStore.Images.Thumbnails.getThumbnail(
getContentResolver(), ImageId,
MediaStore.Images.Thumbnails.MINI_KIND,
bmOptions);
} else {
Toast.makeText(this, "불러올수 없는 이미지 입니다.", Toast.LENGTH_LONG).show();
}
cursor.close();
}
return thumbnail;
}
}작업 전
썸네일 불러오기 후
