我正在开发一个图库应用程序，我将外部存储中的所有图标显示到我的应用程序中。我按照以下链接中的教程进行操作。
现在，除此之外，我还为用户提供了一个选项，可以从应用程序中拍摄照片并将其保存到图库中。使用相机意图拍摄照片时，图像实际保存在图库中。但我不得不想要另一个片段并回到画廊看我拍的照片。
要立即查看相关意图的onActivityResult（），我正在重新创建片段。但是当我们单击后退按钮时会出现问题。重新创建的片段永远留在后台。我大脑褪色寻找答案。任何帮助表示赞赏。
请在下面找到我到目前为止所尝试的内容。
public class GalleryFragment extends Fragment {
Toolbar toolbar;
MenuItem search;
public static ArrayList<Model_images> al_images = new ArrayList<>();
boolean boolean_folder;
Adapter_PhotosFolder obj_adapter;
GridView gv_folder;
FloatingActionButton cameraButton;
private static final int REQUEST_PERMISSIONS = 100;
static final int REQUEST_TAKE_PHOTO = 1;
static final int REQUEST_IMAGE_CAPTURE = 1;
String projectName = "ProjectGA";
File directory;
String mCurrentPhotoPath;
List<GridViewItem> gridItems;
GridView gridView;
public static GalleryFragment newInstance(){
GalleryFragment galleryFragment = new GalleryFragment();
return galleryFragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
directory = new File(Environment.getExternalStorageDirectory() + projectName);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_gallery, container, false);
toolbar = (Toolbar) getActivity().findViewById(R.id.toolbar);
ImageView icon = (ImageView) getActivity().findViewById(R.id.toolbarIcon);
icon.setImageResource(R.drawable.ic_perm_media_black_24dp);
icon.setColorFilter(getResources().getColor(R.color.Gallery));
TextView title = (TextView) getActivity().findViewById(R.id.toolbarTitle);
title.setText(getString(R.string.galleryLabel));
title.setTextColor(getResources().getColor(R.color.textInputEditTextColor));
toolbar.setBackground(getResources().getDrawable(R.drawable.tile_green));
toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_menu_green_24dp));
cameraButton = (FloatingActionButton) getActivity().findViewById(R.id.rightActionButton);
cameraButton.setVisibility(View.VISIBLE);
cameraButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dispatchTakePictureIntent();
}
});
//gridView = (GridView) view.findViewById(R.id.gridView);
gv_folder = (GridView)view.findViewById(R.id.gv_folder);
gv_folder.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getContext(), PhotosActivity.class);
intent.putExtra("value",i);
startActivity(intent);
}
});
if ((ContextCompat.checkSelfPermission(getContext(),
Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(getContext(),
Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) {
if ((ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.WRITE_EXTERNAL_STORAGE)) && (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.READ_EXTERNAL_STORAGE))) {
} else {
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_PERMISSIONS);
}
}else {
Log.e("Else","Else");
fn_imagespath();
}
setHasOptionsMenu(true);
return view;
}
@Override
public void onDestroyView() {
cameraButton.setVisibility(View.INVISIBLE);
super.onDestroyView();
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {photoFile = createImageFile();
} catch (IOException ex) {
Context context = getContext();
CharSequence text = "Photo cannot be stored.";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
// Continue only if the File was successfully created
if (photoFile != null) {
Context context = getContext();
Uri photoURI = FileProvider.getUriForFile(context,
"com.example.projectga.fileprovider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}else{
Context context = getContext();
CharSequence text = "Attention! Required to take picture!!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
}
}
public void createFolder(){
if (!directory.exists()){
directory.mkdirs();
}
}
private File createImageFile() throws IOException {
createFolder();
// Create an image file name
Context context = getContext();
String timeStamp = new SimpleDateFormat("dd-MMM-yyyy").format(new Date());
String imageFileName = projectName + "_" + timeStamp + "_";
File storageDir = getActivity().getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
addImageToGallery(image, context);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = "file:" + image.getPath();
return image;
}
public static void addImageToGallery(File image, final Context context) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis());
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
values.put(MediaStore.MediaColumns.DATA, image.toString());
context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) {
getFragmentManager().beginTransaction()
.replace(R.id.container_gaFragments, GalleryFragment.newInstance()).commit();
}
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
search = menu.add("search").setIcon(R.drawable.ic_search_green_24dp).setShowAsActionFlags(1);
super.onCreateOptionsMenu(menu, inflater);
}
public ArrayList<Model_images> fn_imagespath() {
al_images.clear();
int int_position = 0;
Uri uri;
Cursor cursor;
int column_index_data, column_index_folder_name;
String absolutePathOfImage = null;
uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
String[] projection = {MediaStore.MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME};
final String orderBy = MediaStore.Images.Media.DATE_TAKEN;
cursor = getContext().getContentResolver().query(uri, projection, null, null, orderBy + " DESC");
column_index_data = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
column_index_folder_name = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
while (cursor.moveToNext()) {
absolutePathOfImage = cursor.getString(column_index_data);
Log.e("Column", absolutePathOfImage);
Log.e("Folder", cursor.getString(column_index_folder_name));
for (int i = 0; i < al_images.size(); i++) {
if (al_images.get(i).getStr_folder().equals(cursor.getString(column_index_folder_name))) {
boolean_folder = true;
int_position = i;
break;
} else {
boolean_folder = false;
}
}
if (boolean_folder) {
ArrayList<String> al_path = new ArrayList<>();
al_path.addAll(al_images.get(int_position).getAl_imagepath());
al_path.add(absolutePathOfImage);
al_images.get(int_position).setAl_imagepath(al_path);
} else {
ArrayList<String> al_path = new ArrayList<>();
al_path.add(absolutePathOfImage);
Model_images obj_model = new Model_images();
obj_model.setStr_folder(cursor.getString(column_index_folder_name));
obj_model.setAl_imagepath(al_path);
al_images.add(obj_model);
}
}
for (int i = 0; i < al_images.size(); i++) {
Log.e("FOLDER", al_images.get(i).getStr_folder());
for (int j = 0; j < al_images.get(i).getAl_imagepath().size(); j++) {
Log.e("FILE", al_images.get(i).getAl_imagepath().get(j));
}
}
obj_adapter = new Adapter_PhotosFolder(getContext(),al_images);
gv_folder.setAdapter(obj_adapter);
return al_images;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_PERMISSIONS: {
for (int i = 0; i < grantResults.length; i++) {
if (grantResults.length > 0 && grantResults[i] == PackageManager.PERMISSION_GRANTED) {
fn_imagespath();
} else {
Toast.makeText(getContext(), "The app was not allowed to read or write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
}
}
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
}
}
我还覆盖了Activity中的onBackPressed（）。请帮忙。还附上一些图像以使其清晰。
The exact problem of what is happening
感谢任何帮助。
