Lingviston,
Can you tell me what IDE and process you are using to build your APK file?
I am having issues with loading the Lucene42Codec and I see the code you
are using is just like mine. However, when I try to run the app, I get an
exception stating that it can't find the codec.
I am using IntelliJ to build the APK file using the discrete lucence
library jars.
Thanks,
Darren
On 8/12/13 1:02 AM, "Lingviston" <vladislav.ermo...@outlook.com> wrote:
>Hi, I'm trying to use Lucene in my Android project. To start with I've
>created a small demo app. It works with .txt files but I need to work with
>.pdf. So analyzing my code I understand that it will have some issues with
>.pdfs due to memory management. However the question I want to ask here is
>not related to memory but to hit highlighting. It works now but using of
>`Highlighter` class with pdfs is not what I want. So to implement my own
>highlighting I need to know some kind of coordinates of found words in the
>text. How can I get them? I'm using lucene 4.4.0 while all of the examples
>like here are for much older versions. Here is my code:
>
> public class MainActivity extends Activity {
>
>//------------------------------------------------------------------------
>-----------------------------
> //
> // Constants
> //
>
>//------------------------------------------------------------------------
>-----------------------------
> public static final String FIELD_PATH = "path";
> public static final String FIELD_CONTENTS = "contents";
>
>
>//------------------------------------------------------------------------
>-----------------------------
> //
> // Fields
> //
>
>//------------------------------------------------------------------------
>-----------------------------
> private EditText mEditText;
> private TextView mTextView;
>
>
>//------------------------------------------------------------------------
>-----------------------------
> //
> // Methods
> //
>
>//------------------------------------------------------------------------
>-----------------------------
> @Override
> protected void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.activity_main);
> findViews();
> initViews();
> createIndex();
> }
>
> private void findViews() {
> mEditText = (EditText) findViewById(R.id.activity_main_edittext);
> mTextView = (TextView) findViewById(R.id.activity_main_textview);
> }
>
> private void initViews() {
> mEditText.setOnEditorActionListener(mEditorActionListener);
> }
>
> private void performSearch(String searchString) {
> try {
> Directory directory =
>NIOFSDirectory.open(getExternalFilesDir(null));
> DirectoryReader ireader =
>DirectoryReader.open(directory);
> IndexSearcher isearcher = new IndexSearcher(ireader);
>
> Analyzer analyzer = new
>StandardAnalyzer(Version.LUCENE_44);
> QueryParser queryParser = new
>AnalyzingQueryParser(Version.LUCENE_44, FIELD_CONTENTS, analyzer);
> Query query = queryParser.parse(searchString);
> TopDocs topDocs = isearcher.search(query, null,
>1000);
> ScoreDoc[] docs = topDocs.scoreDocs;
>
> StringBuilder result = new StringBuilder();
> StringBuilder debugInfo = new StringBuilder();
> debugInfo.append("Number of hits: ");
> debugInfo.append(docs.length);
> debugInfo.append("\n");
>
> // Iterate through the results:
> for (int i = 0; i < docs.length; i++) {
> Document hitDoc =
>isearcher.doc(docs[i].doc);
>
> String path = hitDoc.get(FIELD_PATH);
> debugInfo.append("Path: ");
> debugInfo.append(path);
> debugInfo.append("\n");
>
>
>result.append("-------------------------------------------------------");
> result.append("File: ");
> result.append(path);
>
>result.append("-------------------------------------------------------");
> result.append("<br>");
>
> String content =
>hitDoc.get(FIELD_CONTENTS);
> QueryScorer scorer = new
>QueryScorer(query);
> Highlighter highlighter = new
>Highlighter(new SimpleHTMLFormatter("", ""), scorer);
> highlighter.setTextFragmenter(new
>SimpleSpanFragmenter(scorer, Integer.MAX_VALUE));
> String highlighted =
>highlighter.getBestFragment(analyzer, FIELD_CONTENTS, content);
>
>result.append("-------------------------------------------------------");
> result.append("Contents: ");
>
>result.append("-------------------------------------------------------");
> result.append("<br>");
> result.append(highlighted);
> result.append("<br><br><br>");
> }
>
> //not working
> /*PostingsHighlighter highlighter = new
>PostingsHighlighter();
> String highlights[] =
>highlighter.highlight(FIELD_CONTENTS, query, isearcher, topDocs);*/
>
>mTextView.setText(Html.fromHtml(result.toString()));
> Log.d(getClass().getSimpleName(),
>debugInfo.toString());
> } catch (Exception e) {
> e.printStackTrace();
> Log.e(getClass().getSimpleName(), e.getMessage());
> }
>
> }
>
> private void createIndex() {
> try {
> //Create directory for index.
> Directory indexDirectory = new
>NIOFSDirectory(getExternalFilesDir(null));
>
> Analyzer analyzer = new
>StandardAnalyzer(Version.LUCENE_44);
>
> IndexWriterConfig config = new
>IndexWriterConfig(Version.LUCENE_44, analyzer);
> config.setOpenMode(OpenMode.CREATE);
>
> IndexWriter indexWriter = new
>IndexWriter(indexDirectory, config);
>
> //Loop through files in specified directory and
>adding them to index.
> File dir = new
>File(Environment.getExternalStorageDirectory() + "/lucene");
> File[] files = dir.listFiles();
> for (File file : files) {
> Document document = new Document();
>
> {
> FieldType fieldType = new
>FieldType(TextField.TYPE_STORED);
>
>fieldType.setIndexOptions(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OF
>FSETS);
>
> String path =
>file.getCanonicalPath();
> document.add(new Field(FIELD_PATH,
>path, fieldType));
> }
>
> {
> FieldType fieldType = new
>FieldType(TextField.TYPE_STORED);
> fieldType.setIndexed(true);
>
>fieldType.setIndexOptions(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OF
>FSETS);
> fieldType.setStored(true);
>
>fieldType.setStoreTermVectors(true);
> fieldType.setTokenized(true);
>
>fieldType.setStoreTermVectorOffsets(true);
> String content = readFully(new
>FileReader(file)); //we can't store Reader objects but we need to be able
>to
>access the content for highlighting
> document.add(new
>Field(FIELD_CONTENTS, content, fieldType));
> }
>
> indexWriter.addDocument(document);
> }
> indexWriter.close();
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
>
> public static String readFully(Reader reader) throws IOException {
> char[] arr = new char[8*1024]; // 8K at a time
> StringBuffer buf = new StringBuffer();
> int numChars;
>
> while ((numChars = reader.read(arr, 0, arr.length)) > 0) {
> buf.append(arr, 0, numChars);
> }
>
> return buf.toString();
> }
>
> @Override
> public boolean onCreateOptionsMenu(Menu menu) {
> getMenuInflater().inflate(R.menu.main, menu);
> return true;
> }
>
>
>//------------------------------------------------------------------------
>-----------------------------
> //
> // Listeners
> //
>
>//------------------------------------------------------------------------
>-----------------------------
> private OnEditorActionListener mEditorActionListener = new
>OnEditorActionListener() {
> @Override
> public boolean onEditorAction(TextView v, int actionId,
>KeyEvent event) {
> if (actionId == EditorInfo.IME_ACTION_SEARCH) {
> performSearch(v.getText().toString());
> return true;
> }
> return false;
> }
>};
>}
>
>So how can I get hit coordinates and maybe you have any other advices what
>I'm doing wrong? This is rather common task I think so it must be rather
>simple.
>
>
>
>--
>View this message in context:
>http://lucene.472066.n3.nabble.com/How-to-get-hits-coordinates-in-Lucene-4
>-4-0-tp4083913.html
>Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
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