Search for text in PDFs on Android

val textSearch = TextSearch(document, configuration)
val query = "Weather reports"
val searchResults : List<SearchResult> = textSearch.performSearch(query)

final TextSearch textSearch = new TextSearch(document, configuration);
final String query = "Weather reports";
final List<SearchResult> searchResults = textSearch.performSearch(query);

// Perform an async search on a computation thread and update the UI on the main thread.
val searchSubscription = search.performSearchAsync(query)
    .subscribeOn(Schedulers.computation())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe { nextResult ->
        // This will be called once for every `SearchResult` object.
        // Put your search result handling here.
    }

// Perform an async search on a computation thread and update the UI on the main thread.
final Disposable searchSubscription = textSearch.performSearchAsync(query)
    .subscribeOn(Schedulers.computation())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(nextResult -> {
        // This will be called once for every `SearchResult` object.
        // Put your search result handling here.
    })

val options = SearchOptions.Builder()
    .maxSearchResults(100)
    .snippetLength(40)
    .build()

val results = textSearch.performSearch(query, options)

final SearchOptions options = new SearchOptions.Builder()
    .maxSearchResults(100)
    .snippetLength(40)
    .build();

final List<SearchResult> results = textSearch.performSearch(query, options);

// The search result consists of at least one text rect. This will create a union of all of its rects.
val searchResultRect: RectF = PdfUtils.createPdfRectUnion(searchResult.textBlock.pageRects)
// This will also switch to the correct page if it is not active.
fragment.zoomTo(searchResultRect, searchResult.pageNumber, 200)

// The search result consists of at least one text rect. This will create a union of all of its rects.
final RectF searchResultRect = PdfUtils.createPdfRectUnion(searchResult.textBlock.pageRects);
// This will also switch to the correct page if it is not active.
fragment.zoomTo(searchResultRect, searchResult.pageNumber, 200);

// Use the synthetic property for accessing a view from the layout.
import kotlinx.android.synthetic.main.activity_main.previewText

/**
 * Sets the search result snippet to a TextView highlighting the actual search term inside the result.
 */
private fun showSearchResultText(result: SearchResult) {
    // If you deactivated snippet extraction, it may be `null`.
    val snippet = result.snippet ?: return

    // This is the location of the search term inside the snippet.
    val highlightStart = snippet.rangeInSnippet.startPosition
    val highlightEnd = snippet.rangeInSnippet.endPosition

    val previewText = SpannableString(snippet.text)
    val resultHighlight = BackgroundColorSpan(Color.YELLOW)
    previewText.setSpan(resultHighlight, highlightStart, highlightEnd, 0)
}

// This has to be inflated from your layout before using it.
private TextView previewText;

/**
 * Sets the search result snippet to a TextView highlighting the actual search term inside the result.
 */
private void showSearchResultText(@NonNull final SearchResult result) {
    // If you deactivated snippet extraction, it may be `null`.
    if (result.snippet == null) return;

    // This is the location of the search term inside the snippet.
    final int highlightStart = result.snippet.rangeInSnippet.getStartPosition();
    final int highlightEnd = result.snippet.rangeInSnippet.getEndPosition();

    final SpannableString previewText = new SpannableString(result.snippet.text);
    final BackgroundColorSpan resultHighlight = new BackgroundColorSpan(Color.YELLOW);
    previewText.setSpan(resultHighlight, highlightStart, highlightEnd, 0);
}

lateinit var highlighter : SearchResultHighlighter

/** Holds your PdfFragment. You don't need to define this when using PdfActivity. */
val fragment: PdfFragment

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    // The context is used to retrieve the highlighter color from the theme.
    highlighter = SearchResultHighlighter(context)
    fragment.addDrawableProvider(highlighter)
}

/**
 * Called by your application once a search is finished.
 * The highlighter will immediately start highlighting the given results.
 */
fun onSearchFinished(searchResults : List<SearchResult>) = highlighter.setSearchResults(searchResults)

private SearchResultHighlighter highlighter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This is possible in all `PdfActivity` subclasses.
    // If you aren't using `PdfActivity`, replace this with your own code.
    final PdfFragment fragment = getPdfFragment();

    // The context is used to retrieve the highlighter color from the theme.
    highlighter = new SearchResultHighlighter(context);
    fragment.addDrawableProvider(highlighter);

    // ...
}

/**
 * Called by your application once a search is finished.
 */
private void onSearchFinished(@NonNull final List<SearchResult> searchResults) {
    // The highlighter will immediately start highlighting the given results.
    highlighter.setSearchResults(searchResults);
}

/**
 * Called by your application, e.g. if the user taps a search result inside a list.
 */
fun onSearchResultSelected(selectedResult : SearchResult) =
    highlighter.setSelectedSearchResult(selectedResult)

/**
 * Called by your application, e.g. if the user taps a search result inside a list.
 */
private void onSearchResultSelected(@NonNull final SearchResult selectedResult) {
    highlighter.setSelectedSearchResult(selectedResult);
}