我在我的应用中遇到了一个错误，每次我更改详细活动的方向时，共享操作项都会添加到操作栏中。
当我开始详细活动并附加片段时，这应该只发生一次。出于某种原因，每次我改变方向时都会发生这种情况。 我知道当我改变方向时，我实际上正在摧毁并重新创建活动，但是遵循这个逻辑，每当我改变方向时，共享行动项目也应该被销毁，不应该被摧毁吗？
这是我的详细活动片段：
$ ls -b
\177.txt
我的详细活动如下：
/**
* Fragment where the information about a selected movie will be displayed
*/
public class DetailActivityFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> {
private static final int MY_LOADER_ID = 2;
private static final int NON_FAVORITE = 0;
List<Trailer> mTrailerList;
List<Review> mReviewList;
TrailerAdapter mTrailerAdapter;
ReviewAdapter mReviewAdapter;
Movie mMovie;
private final int FAVORITE = 2;
@Bind(R.id.movie_name) TextView mMovieTitle;
@Bind(R.id.release_date) TextView mReleaseDate;
@Bind(R.id.plot_synopsis) TextView mSynopsis;
@Bind(R.id.vote_average) TextView mRating;
@Bind(R.id.movie_thumbnail) ImageView mMovieThumbnail;
private String mMovieId;
private boolean FAVORITE_MOVIE = false;
private ShareActionProvider mShareActionProvider;
public DetailActivityFragment() {}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
mMovieId = getActivity().getIntent().getStringExtra(MovieListFragment.EXTRA_MOVIE);
Cursor trailerCursor = getActivity().getContentResolver().query(
TrailersEntry.CONTENT_URI,
null,
TrailersEntry.COLUMN_MOVIE_ID + " = ?",
new String[] {mMovieId},
null
);
Cursor reviewCursor = getActivity().getContentResolver().query(
ReviewsEntry.CONTENT_URI,
null,
ReviewsEntry.COLUMN_MOVIE_ID + " = ?",
new String[]{mMovieId},
null
);
mTrailerList = Utility.getTrailersFromCursor(trailerCursor);
mReviewList = Utility.getReviewsFromCursor(reviewCursor);
getLoaderManager().initLoader(MY_LOADER_ID, null, this);
//If the movie is a favorite, we will change the appearance of the favorite button and its callback
Cursor checkFavouriteCursor = getActivity().getContentResolver().query(
MoviesEntry.CONTENT_URI,
null,
MoviesEntry.COLUMN_MOVIE_ID + " = ? AND " + MoviesEntry.COLUMN_MOVIE_TYPE + " = ?",
new String[] {mMovieId,String.valueOf(FAVORITE)},
null
);
if (checkFavouriteCursor != null && checkFavouriteCursor.getCount() >0) {
FAVORITE_MOVIE = true;
//Free cursor for resources
checkFavouriteCursor.close();
}
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.detail_fragment, menu);
// Retrieve the share menu item
MenuItem menuItem = menu.findItem(R.id.action_share);
// Get the provider and hold onto it to set/change the share intent.
mShareActionProvider =
(ShareActionProvider) MenuItemCompat.getActionProvider(menuItem);
// Attach an intent to this ShareActionProvider. You can update this at any time,
// like when the user selects a new piece of data they might like to share.
if (mShareActionProvider != null ) {
mShareActionProvider.setShareIntent(createShareTrailerIntent());
}
}
private Intent createShareTrailerIntent() {
if (mTrailerAdapter.getCount() == 0) return null;
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT, mTrailerAdapter.getItem(0).getTrailerPath());
return shareIntent;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_detail, container, false);
//We target the appropriate views
ButterKnife.bind(this, rootView);
//Initialize the trailer adapter
mTrailerAdapter = new TrailerAdapter(
getContext(),
R.id.trailer,
(ArrayList<Trailer>) mTrailerList,
inflater
);
//Initialize the trailer adapter
mReviewAdapter = new ReviewAdapter(
getContext(),
R.id.review_holder,
(ArrayList<Review>) mReviewList,
inflater
);
ListView trailerListView = (ListView) rootView.findViewById(R.id.trailer_listview);
ListView reviewListView = (ListView) rootView.findViewById(R.id.review_listview);
trailerListView.setAdapter(mTrailerAdapter);
reviewListView.setAdapter(mReviewAdapter);
//We assign a callback method when the favourites_button is clicked
final Button favouritesButton = (Button) rootView.findViewById(R.id.favourites_button);
updateButtonStyling(favouritesButton);
favouritesButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
updateMovieAsFavourite(mMovie);
updateButtonStyling(favouritesButton);
}
});
//We assign a callback method to the trailer elements
trailerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Trailer trailer = (Trailer) parent.getItemAtPosition(position);
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(trailer.getTrailerPath())));
}
});
//If the movie we have selected
return rootView;
}
//Method to save a movie into the database
private void updateMovieAsFavourite(Movie movie) {
ContentValues values = new ContentValues();
values.put(MoviesEntry.COLUMN_MOVIE_ID, movie.getMovieId());
values.put(MoviesEntry.COLUMN_POSTER_URL,movie.getUrlPath());
values.put(MoviesEntry.COLUMN_TITLE, movie.getOriginalTitle());
values.put(MoviesEntry.COLUMN_PLOT,movie.getPlotSynopsis());
values.put(MoviesEntry.COLUMN_RATING_AVERAGE, movie.getUserRating());
values.put(MoviesEntry.COLUMN_RATING_COUNT, movie.getVoteCount());
values.put(MoviesEntry.COLUMN_RELEASE_DATE, movie.getReleaseDate());
//Actually updated field, marking movie as a favorite
if (FAVORITE_MOVIE) {
values.put(MoviesEntry.COLUMN_MOVIE_TYPE, NON_FAVORITE);
} else {
values.put(MoviesEntry.COLUMN_MOVIE_TYPE, FAVORITE);
}
//Return value from the insertion
int numrows = 0;
//Actual insertion, if the movie is not saved, we do it now
try {
getActivity().getContentResolver().update(
MoviesEntry.CONTENT_URI,
values,
MoviesEntry.COLUMN_MOVIE_ID + " = ?",
new String[]{String.valueOf(movie.getMovieId())}
);
if (FAVORITE_MOVIE) {
Toast.makeText(getActivity(),
String.format(
"%s removed from your favorites list",
movie.getOriginalTitle()),
Toast.LENGTH_LONG
).show();
} else {
Toast.makeText(getActivity(),
String.format(
"%s added to your favorites list",
movie.getOriginalTitle()),
Toast.LENGTH_LONG
).show();
}
} catch (SQLException e) {e.printStackTrace();}
//Clicking the button changes wether the movie is a favourite or not
FAVORITE_MOVIE = !FAVORITE_MOVIE;
}
private void updateButtonStyling(Button button) {
if (FAVORITE_MOVIE) {
button.setText(R.string.remove_favorite);
button.setBackgroundColor(getResources().getColor(R.color.danger_button));
} else {
button.setText(R.string.favorite);
button.setBackgroundColor(getResources().getColor(R.color.success_button));
}
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
return new CursorLoader(getContext(),
MoviesEntry.CONTENT_URI,
null,
MoviesEntry.COLUMN_MOVIE_ID + " = ?",
new String[] {mMovieId},
null
);
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
mMovie = Utility.makeMovieFromCursor(data);
if (mMovie != null) {
mMovieTitle.setText(Html.fromHtml("<b>Original Title: </b>" + mMovie.getOriginalTitle()));
mReleaseDate.setText(Html.fromHtml("<b>Release date: </b>" + mMovie.getReleaseDate()));
mSynopsis.setText(Html.fromHtml("<b>Synopsis: </b><br></br>" + mMovie.getPlotSynopsis()));
mRating.setText(Html.fromHtml("<b>Rating: </b>"
+ String.format("%.2f / 10 - Based on %d reviews",
mMovie.getUserRating(),
mMovie.getVoteCount()
)));
Picasso.with(getContext())
.load(mMovie.getUrlPath())
.resize(300,450)
.into(mMovieThumbnail);
}
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
}
}
共享操作项所在的XML文件是：
public class DetailActivity extends AppCompatActivity {
public final String DETAIL_TAG = "detail fragment";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// We include the fragment into the Activity's layout
getSupportFragmentManager().beginTransaction()
.add(R.id.detail_container, new DetailActivityFragment(),DETAIL_TAG )
.commit();
// We display the up button but we get rid of the activity name as we'll use an icon
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
}
}
如果你能指出我正确的方向，我会很感激。
非常感谢。