Java tutorial
/* * Twittnuker - Twitter client for Android * * Copyright (C) 2013-2014 vanita5 <mail@vanita5.de> * * This program incorporates a modified version of Twidere. * Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package de.vanita5.twittnuker.adapter; import static de.vanita5.twittnuker.util.UserColorNicknameUtils.getUserNickname; import android.content.ContentResolver; import android.content.Context; import android.content.SharedPreferences; import android.content.res.Resources; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.support.v4.widget.SimpleCursorAdapter; import android.text.TextUtils; import android.view.View; import android.widget.EditText; import android.widget.FilterQueryProvider; import android.widget.ImageView; import android.widget.TextView; import org.mariotaku.querybuilder.Columns.Column; import org.mariotaku.querybuilder.RawItemArray; import org.mariotaku.querybuilder.Where; import de.vanita5.twittnuker.Constants; import de.vanita5.twittnuker.R; import de.vanita5.twittnuker.activity.iface.IThemedActivity; import de.vanita5.twittnuker.app.TwittnukerApplication; import de.vanita5.twittnuker.provider.TweetStore.CachedHashtags; import de.vanita5.twittnuker.provider.TweetStore.CachedUsers; import de.vanita5.twittnuker.provider.TweetStore.CachedValues; import de.vanita5.twittnuker.util.ArrayUtils; import de.vanita5.twittnuker.util.ImageLoaderWrapper; import de.vanita5.twittnuker.util.ParseUtils; import de.vanita5.twittnuker.util.ThemeUtils; import java.util.ArrayList; import java.util.List; import java.util.Locale; import java.util.Map.Entry; public class UserHashtagAutoCompleteAdapter extends SimpleCursorAdapter implements Constants { private static final String[] FROM = new String[0]; private static final int[] TO = new int[0]; private static final String[] CACHED_USERS_COLUMNS = new String[] { CachedUsers._ID, CachedUsers.USER_ID, CachedUsers.NAME, CachedUsers.SCREEN_NAME, CachedUsers.PROFILE_IMAGE_URL }; private final Locale mLocale; private final ContentResolver mResolver; private final SQLiteDatabase mDatabase; private final ImageLoaderWrapper mProfileImageLoader; private final SharedPreferences mPreferences, mUserNicknamePreferences; private final Resources mResources; private final EditText mEditText; private final boolean mDisplayProfileImage, mNicknameOnly; private int mProfileImageUrlIdx, mNameIdx, mScreenNameIdx, mUserIdIdx; private char mToken = '@'; public UserHashtagAutoCompleteAdapter(final Context context) { this(context, null); } public UserHashtagAutoCompleteAdapter(final Context context, final EditText view) { super(context, R.layout.list_item_two_line_small, null, FROM, TO, 0); mEditText = view; mPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); mUserNicknamePreferences = context.getSharedPreferences(USER_NICKNAME_PREFERENCES_NAME, Context.MODE_PRIVATE); mResolver = context.getContentResolver(); final TwittnukerApplication app = TwittnukerApplication.getInstance(context); mProfileImageLoader = app != null ? app.getImageLoaderWrapper() : null; mDatabase = app != null ? app.getSQLiteDatabase() : null; mDisplayProfileImage = mPreferences != null && mPreferences.getBoolean(KEY_DISPLAY_PROFILE_IMAGE, true); mNicknameOnly = mPreferences != null && mPreferences.getBoolean(KEY_NICKNAME_ONLY, false); mLocale = context.getResources().getConfiguration().locale; final int themeRes, accentColor; if (context instanceof IThemedActivity) { themeRes = ((IThemedActivity) context).getThemeResourceId(); accentColor = ((IThemedActivity) context).getOverrideAccentColor(); } else { themeRes = ThemeUtils.getThemeResource(context); accentColor = ThemeUtils.getUserThemeColor(context); } mResources = ThemeUtils.getThemedResourcesForActionIcons(context, themeRes, accentColor); } public UserHashtagAutoCompleteAdapter(final EditText view) { this(view.getContext(), view); } @Override public void bindView(final View view, final Context context, final Cursor cursor) { if (isCursorClosed()) return; final TextView text1 = (TextView) view.findViewById(android.R.id.text1); final TextView text2 = (TextView) view.findViewById(android.R.id.text2); final ImageView icon = (ImageView) view.findViewById(android.R.id.icon); // Clear images in prder to prevent images in recycled view shown. icon.setImageDrawable(null); if (mScreenNameIdx != -1 && mNameIdx != -1 && mUserIdIdx != -1) { final String nick = getUserNickname(context, cursor.getLong(mUserIdIdx)); final String name = cursor.getString(mNameIdx); if (TextUtils.isEmpty(nick)) { text1.setText(name); } else { text1.setText(mNicknameOnly ? nick : context.getString(R.string.name_with_nickname, name, nick)); } text2.setText("@" + cursor.getString(mScreenNameIdx)); } else { text1.setText("#" + cursor.getString(mNameIdx)); text2.setText(R.string.hashtag); } icon.setVisibility(mDisplayProfileImage ? View.VISIBLE : View.GONE); if (mProfileImageUrlIdx != -1) { if (mDisplayProfileImage && mProfileImageLoader != null) { final String profile_image_url_string = cursor.getString(mProfileImageUrlIdx); mProfileImageLoader.displayProfileImage(icon, profile_image_url_string); } else { icon.setImageResource(R.drawable.ic_profile_image_default); } } else { icon.setImageDrawable(mResources.getDrawable(R.drawable.ic_iconic_action_hashtag)); } super.bindView(view, context, cursor); } public void closeCursor() { final Cursor cursor = getCursor(); if (cursor == null) return; if (!cursor.isClosed()) { cursor.close(); } } @Override public CharSequence convertToString(final Cursor cursor) { if (isCursorClosed()) return null; return cursor.getString(mScreenNameIdx != -1 ? mScreenNameIdx : mNameIdx); } public boolean isCursorClosed() { final Cursor cursor = getCursor(); return cursor == null || cursor.isClosed(); } @Override public Cursor runQueryOnBackgroundThread(final CharSequence constraint) { char token = mToken; if (mEditText != null && constraint != null) { final CharSequence text = mEditText.getText(); token = text.charAt(mEditText.getSelectionEnd() - constraint.length() - 1); } if (isAtSymbol(token) == isAtSymbol(mToken)) { final FilterQueryProvider filter = getFilterQueryProvider(); if (filter != null) return filter.runQuery(constraint); } mToken = token; final String constraint_escaped = constraint != null ? constraint.toString().replaceAll("_", "^_") : null; if (isAtSymbol(token)) { final StringBuilder builder = new StringBuilder(); builder.append(CachedUsers.SCREEN_NAME + " LIKE ?||'%' ESCAPE '^'"); builder.append(" OR "); builder.append(CachedUsers.NAME + " LIKE ?||'%' ESCAPE '^'"); builder.append(" OR "); builder.append(Where.in(new Column(CachedUsers.USER_ID), new RawItemArray(getMatchedNicknameIds(ParseUtils.parseString(constraint)))).getSQL()); final String selection = constraint_escaped != null ? builder.toString() : null; final String[] selectionArgs = constraint_escaped != null ? new String[] { constraint_escaped, constraint_escaped } : null; final String orderBy = CachedUsers.SCREEN_NAME + ", " + CachedUsers.NAME; return mResolver.query(CachedUsers.CONTENT_URI, CACHED_USERS_COLUMNS, selection, selectionArgs, orderBy); } else { final String selection = constraint_escaped != null ? CachedHashtags.NAME + " LIKE ?||'%' ESCAPE '^'" : null; final String[] selectionArgs = constraint_escaped != null ? new String[] { constraint_escaped } : null; return mDatabase.query(true, CachedHashtags.TABLE_NAME, CachedHashtags.COLUMNS, selection, selectionArgs, null, null, CachedHashtags.NAME, null); } } @Override public Cursor swapCursor(final Cursor cursor) { if (cursor != null) { mNameIdx = cursor.getColumnIndex(CachedValues.NAME); mScreenNameIdx = cursor.getColumnIndex(CachedUsers.SCREEN_NAME); mUserIdIdx = cursor.getColumnIndex(CachedUsers.USER_ID); mProfileImageUrlIdx = cursor.getColumnIndex(CachedUsers.PROFILE_IMAGE_URL); } return super.swapCursor(cursor); } private long[] getMatchedNicknameIds(final String str) { if (TextUtils.isEmpty(str)) return new long[0]; final List<Long> list = new ArrayList<Long>(); for (final Entry<String, ?> entry : mUserNicknamePreferences.getAll().entrySet()) { final String value = ParseUtils.parseString(entry.getValue()); final long key = ParseUtils.parseLong(entry.getKey(), -1); if (key == -1 || TextUtils.isEmpty(value)) { continue; } if (value.toLowerCase(mLocale).startsWith(str.toLowerCase(mLocale))) { list.add(key); } } return ArrayUtils.fromList(list); } private static boolean isAtSymbol(final char character) { switch (character) { case '\uff20': case '@': return true; } return false; } }