@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
mViewAdapter.swapCursor(new BooksCursor(data));
// If the user queries, set the no results string. If there is no query, set the empty
// library string.
TextView emptyView = (TextView) mRootView.findViewById(R.id.view_books_empty);
if (mQueried) emptyView.setText(R.string.empty_view_books_no_results);
else emptyView.setText(R.string.empty_view_books);
mViewAdapter.notifyDataSetChanged();
}
@Override
public View onCreateView(
final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mRootView = inflater.inflate(R.layout.fragment_view_books, container, false);
View emptyView = mRootView.findViewById(R.id.view_books_empty);
mSearchField = (EditText) mRootView.findViewById(R.id.view_books_search_field);
mLoadingSpinner = (ProgressBar) mRootView.findViewById(R.id.view_books_progress_spinner);
// Initialize recycler view
mRecyclerView = (RecyclerView) mRootView.findViewById(R.id.view_books_recyclerview);
mViewAdapter =
new ViewAdapter(
getContext(),
new ViewAdapter.ViewAdapterOnClickHandler() {
@Override
public void onClick(String bookId, ViewAdapter.ViewHolder holder) {
((BookSelectionCallback) getActivity()).onBookItemSelected(bookId, holder);
}
},
emptyView);
mViewAdapter.swapCursor(null);
if (((ViewGroup.MarginLayoutParams) mSearchField.getLayoutParams()).leftMargin > 0) {
// Number of columns determined by sw and orientation (see res/values/integers)
mRecyclerView.setLayoutManager(
new StaggeredGridLayoutManager(
getResources().getInteger(R.integer.num_card_columns),
StaggeredGridLayoutManager.VERTICAL));
} else {
mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
}
mRecyclerView.setAdapter(mViewAdapter);
// This is performed every time the text field value is changed
// Use of timer to delay changed text event attributed to Marcus Pohls of futurestud.io
// (url: https://futurestud.io/blog/android-how-to-delay-changedtextevent-on-androids-edittext)
mSearchField.addTextChangedListener(
new TextWatcher() {
private Timer timer;
private static final int TIMER_DURATION = 600;
// Called before text in EditText changes
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// no need
}
// Called while text in EditText changes
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// User is currently typing: reset already started timer (if existing)
if (timer != null) timer.cancel();
}
// Called after text in EditText changes
@Override
public void afterTextChanged(final Editable s) {
// User typed: start the timer. This allows the action below to be executed only
// within the temporal bounds set by the timer. The timer runs until the specified
// duration time (in ms). If the user continues to type, the timer is reset back
// to 0 and starts again.
timer = new Timer();
timer.schedule(
new TimerTask() {
@Override
public void run() {
// Restarting the loader needs to be done on the ui thread
mRootView.post(
new Runnable() {
@Override
public void run() {
restartLoader();
}
});
}
},
TIMER_DURATION);
}
});
// Start the fetch fragment
mRootView
.findViewById(R.id.view_books_button_add)
.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
((FetchButtonClickedListener) getActivity()).onFetchButtonClicked();
}
});
// Save the value currently in the search field for when the activity recreates itself
if (savedInstanceState != null) {
mSearchField.setText(savedInstanceState.getString(SIS_QUERY));
mSearchField.setHint("");
}
return mRootView;
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
mViewAdapter.swapCursor(null);
}