Question

我的主要活动有Listview和搜索视图。 Listview显示数据库中的所有条目。它工作正常（从我的数据库加载所有单词/字符串）。但问题在于SearchView。当我输入文本时，它不会在Listview中过滤字符串/单词。所以，它什么都没发生，我不知道为什么。

以下三个类：主要活动，wordactivity和数据库。我需要一些帮助。我是新手。

BancoDictionary（主要活动）

public class BancoDictionary extends Activity  {

public static final String PREFS_NAME = "MyPrefsFile1";


ListView mListView;
SearchView sv;


ArrayAdapter<WordDefinition> adapter;


ArrayList<WordDefinition> allWordDefinitions=new ArrayList<WordDefinition>();


DictionaryDatabase DictionaryDatabase;

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

    setContentView(R.layout.main);


    mListView = (ListView) findViewById(R.id.list);
    sv = (SearchView) findViewById(R.id.searchView1);

    adapter =new ArrayAdapter<WordDefinition>(this, android.R.layout.simple_list_item_1, allWordDefinitions);
    mListView.setAdapter(adapter);

    sv.setOnQueryTextListener(new OnQueryTextListener() {

        @Override
        public boolean onQueryTextSubmit(String text) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public boolean onQueryTextChange(String text) {


            adapter.getFilter().filter(text);
            return false;
        }
    });

    mListView.setTextFilterEnabled(true);



    DictionaryDatabase=new DictionaryDatabase(this); 
    allWordDefinitions=DictionaryDatabase.getAllWords(); 




    Collections.sort(allWordDefinitions, new CustomComparator());   
    mListView.setAdapter(new BaseAdapter() {

        @Override
        public View getView(int position, View view, ViewGroup parent) {
            if (view==null) {
                view=getLayoutInflater().inflate(R.layout.list_item, parent, false);
            }
            TextView textView=(TextView) view.findViewById(R.id.listItemTextView);
            textView.setText(allWordDefinitions.get(position).word);

            return view;
        }

        @Override
        public long getItemId(int arg0) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public Object getItem(int arg0) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return allWordDefinitions.size();
        }
    });

    mListView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View view, int position,
                long arg3) {
            Intent intent =new Intent(BancoDictionary.this, WordDefinitionDetailActivity.class);
            intent.putExtra("word", allWordDefinitions.get(position).word);
            intent.putExtra("definition", allWordDefinitions.get(position).definition);


            startActivity(intent);
        }
    });


}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
 // Inflate the menu; this adds items to the action bar if it is present.
 getMenuInflater().inflate(R.menu.main, menu);
         return super.onCreateOptionsMenu(menu);
}



public class CustomComparator implements Comparator<WordDefinition> { 
       @Override
       public int compare(WordDefinition p1, WordDefinition p2) {
          return p1.word.compareToIgnoreCase(p2.word);
       }
    }

}

WordDefinition

public class WordDefinition {
String word,definition;

public WordDefinition(String word,ArrayList<String> alldefinition) {
    this.word=word;

    StringBuilder stringBuilder=new StringBuilder();
    for (String string : alldefinition) {
        stringBuilder.append(string);
    }       
    this.definition=stringBuilder.toString();

}

public WordDefinition(String word,String alldefinition) {
    this.word=word;     
    this.definition=alldefinition;

}


  }

DictionaryDatabase

public class DictionaryDatabase {
private static final String TAG = "DictionaryDatabase";

public static final String KEY_WORD = SearchManager.SUGGEST_COLUMN_TEXT_1;
public static final String KEY_DEFINITION = SearchManager.SUGGEST_COLUMN_TEXT_2;

private static final String DATABASE_NAME = "dictionary";
private static final String FTS_VIRTUAL_TABLE = "FTSdictionary";
private static final int DATABASE_VERSION = 2;

private final DictionaryOpenHelper mDatabaseOpenHelper;
private static final HashMap<String,String> mColumnMap = buildColumnMap();

public DictionaryDatabase(Context context) {
    mDatabaseOpenHelper = new DictionaryOpenHelper(context);
}

private static HashMap<String,String> buildColumnMap() {
    HashMap<String,String> map = new HashMap<String,String>();
    map.put(KEY_WORD, KEY_WORD);
    map.put(KEY_DEFINITION, KEY_DEFINITION);
    map.put(BaseColumns._ID, "rowid AS " +
            BaseColumns._ID);
    map.put(SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID, "rowid AS " +
            SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID);
    map.put(SearchManager.SUGGEST_COLUMN_SHORTCUT_ID, "rowid AS " +
            SearchManager.SUGGEST_COLUMN_SHORTCUT_ID);
    return map;
}




public Cursor getWord(String rowId, String[] columns) {
    String selection = "rowid = ?";
    String[] selectionArgs = new String[] {rowId};

    return query(selection, selectionArgs, columns);

}

public Cursor getWordMatches(String query, String[] columns) {
    String selection = KEY_WORD + " MATCH ?";
    String[] selectionArgs = new String[] {query+"*"};

    return query(selection, selectionArgs, columns);

}

private Cursor query(String selection, String[] selectionArgs, String[] columns) {

    SQLiteQueryBuilder builder = new SQLiteQueryBuilder();
    builder.setTables(FTS_VIRTUAL_TABLE);
    builder.setProjectionMap(mColumnMap);

    Cursor cursor = builder.query(mDatabaseOpenHelper.getReadableDatabase(),
            columns, selection, selectionArgs, null, null, KEY_WORD + " COLLATE NOCASE ASC");

    if (cursor == null) {
        return null;
    } else if (!cursor.moveToFirst()) {
        cursor.close();
        return null;
    }
    return cursor;
}

private static class DictionaryOpenHelper extends SQLiteOpenHelper {

    private final Context mHelperContext;
    private SQLiteDatabase mDatabase;

    private static final String FTS_TABLE_CREATE =
                "CREATE VIRTUAL TABLE " + FTS_VIRTUAL_TABLE +
                " USING fts3 (" +
                KEY_WORD + ", " +
                KEY_DEFINITION + ");";



    DictionaryOpenHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        mHelperContext = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        mDatabase = db;
        mDatabase.execSQL(FTS_TABLE_CREATE);
        loadDictionary();
    }



    private void loadDictionary() {
        new Thread(new Runnable() {
            public void run() {
                try {
                    loadWords();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }).start();
    }

    private void loadWords() throws IOException {
        Log.d(TAG, "Loading words...");
        final Resources URL = mHelperContext.getResources();
        InputStream input = new URL("http://example.com.br/example.txt").openStream();


        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        try {
            String line;
            while ((line = reader.readLine()) != null) {
                String[] strings = TextUtils.split(line, "//");
                if (strings.length < 2) continue;
                long id = addWord(strings[0].trim(), strings[1].trim());
                if (id < 0) {
                    Log.e(TAG, "unable to add word: " + strings[0].trim());
                }
            }
        } finally {
            reader.close();
        }
        Log.d(TAG, "DONE loading words.");
    }


    public long addWord(String word, String definition) {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_WORD, word);
        initialValues.put(KEY_DEFINITION, definition);

        return mDatabase.insert(FTS_VIRTUAL_TABLE, null, initialValues);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
                + newVersion + ", which will destroy all old data");
        db.execSQL("DROP TABLE IF EXISTS " + FTS_VIRTUAL_TABLE);
        onCreate(db);
    }
}

public long insertData(WordDefinition wordDefinition) {
    SQLiteDatabase database=mDatabaseOpenHelper.getWritableDatabase();
    ContentValues values=new ContentValues();

    values.put(KEY_WORD, wordDefinition.word);
    values.put(KEY_DEFINITION, wordDefinition.definition);

    return database.insert(FTS_VIRTUAL_TABLE, null, values);        

}

   public long updateData(WordDefinition wordDefinition) {
    SQLiteDatabase database=mDatabaseOpenHelper.getWritableDatabase();
    ContentValues values=new ContentValues();

    values.put(KEY_WORD, wordDefinition.word);
    values.put(KEY_DEFINITION, wordDefinition.definition);

    return database.update(FTS_VIRTUAL_TABLE, values, KEY_WORD+" =?", new String[]{wordDefinition.word});   

}

public void deleteData(WordDefinition wordDefinition) {
    SQLiteDatabase database=mDatabaseOpenHelper.getWritableDatabase();
    String queryString="DELETE FROM "+FTS_VIRTUAL_TABLE+" WHERE "+KEY_WORD+" = '"+wordDefinition.word+"'";

    database.execSQL(queryString);
}


public ArrayList<WordDefinition> getAllWords() {
ArrayList<WordDefinition> arrayList=new ArrayList<WordDefinition>();
SQLiteDatabase database=mDatabaseOpenHelper.getReadableDatabase();

String selectAllQueryString="SELECT * FROM "+FTS_VIRTUAL_TABLE;
Cursor cursor=database.rawQuery(selectAllQueryString, null);

if (cursor.moveToFirst()) {
    do {            
        WordDefinition wordDefinition=new WordDefinition(cursor.getString(cursor.getColumnIndex(KEY_WORD)), cursor.getString(cursor.getColumnIndex(KEY_DEFINITION)));
        arrayList.add(wordDefinition);              
    } while (cursor.moveToNext());          
}   
return arrayList;
}

public WordDefinition getWordDefinition(String word) {
SQLiteDatabase database=mDatabaseOpenHelper.getReadableDatabase();
WordDefinition wordDefinition=null;

String selectQueryString="SELECT * FROM "+FTS_VIRTUAL_TABLE+ " WHERE "+KEY_WORD+" = '"+word+ "'";
Cursor cursor=database.rawQuery(selectQueryString, null);

if (cursor.moveToFirst()) {
    wordDefinition=new WordDefinition(cursor.getString(cursor.getColumnIndex(KEY_WORD)), cursor.getString(cursor.getColumnIndex(KEY_DEFINITION)));

}   

return wordDefinition;

}

public WordDefinition getWordDefinition(long id) {
SQLiteDatabase database=mDatabaseOpenHelper.getReadableDatabase();
WordDefinition wordDefinition=null;

String selectQueryString="SELECT * FROM "+FTS_VIRTUAL_TABLE+ " WHERE "+BaseColumns._ID+" = '"+id+ "'";
Cursor cursor=database.rawQuery(selectQueryString, null);

if (cursor.moveToFirst()) {
    wordDefinition=new WordDefinition(cursor.getString(cursor.getColumnIndex(KEY_WORD)), cursor.getString(cursor.getColumnIndex(KEY_DEFINITION)));

}   

return wordDefinition;

   }


 public void initializeDatabaseFortheFirstTime(ArrayList<WordDefinition> wordDefinitions) {
SQLiteDatabase database=mDatabaseOpenHelper.getWritableDatabase();
database.execSQL("BEGIN");

ContentValues contentValues=new ContentValues();

for (WordDefinition wordDefinition : wordDefinitions) {
    contentValues.put(KEY_WORD, wordDefinition.word);
    contentValues.put(KEY_DEFINITION, wordDefinition.definition);           
    database.insert(FTS_VIRTUAL_TABLE, null, contentValues);
}
database.execSQL("COMMIT");

}

  }

Answer 1

您似乎正在使用具有通用数组适配器的非泛型对象。数组适配器的默认过滤器会检查Object.toString().toLowerCase()。要在数据集中使用过滤器，请创建自定义适配器和过滤器或（这可能是此阶段更容易的选项）覆盖toString()中的WordDefinition以返回您可以过滤的内容通过。

Listview中的SearchView过滤模式模式不起作用

1 个答案: