Java tutorial
/* * Firetweet - Twitter client for Android * * 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 org.getlantern.firetweet.adapter; import android.content.ContentResolver; import android.content.Context; import android.content.SharedPreferences; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.graphics.PorterDuff.Mode; import android.net.Uri; import android.support.annotation.NonNull; import android.support.v4.widget.SimpleCursorAdapter; import android.view.View; import android.widget.EditText; import android.widget.FilterQueryProvider; import android.widget.ImageView; import android.widget.TextView; import org.getlantern.querybuilder.Columns.Column; import org.getlantern.querybuilder.Expression; import org.getlantern.querybuilder.OrderBy; import org.getlantern.querybuilder.RawItemArray; import org.getlantern.firetweet.Constants; import org.getlantern.firetweet.R; import org.getlantern.firetweet.app.FiretweetApplication; import org.getlantern.firetweet.provider.FiretweetDataStore.CachedHashtags; import org.getlantern.firetweet.provider.FiretweetDataStore.CachedUsers; import org.getlantern.firetweet.provider.FiretweetDataStore.CachedValues; import org.getlantern.firetweet.util.MediaLoaderWrapper; import org.getlantern.firetweet.util.ParseUtils; import org.getlantern.firetweet.util.SharedPreferencesWrapper; import org.getlantern.firetweet.util.Utils; import static org.getlantern.firetweet.util.UserColorNameUtils.getUserNickname; public class UserHashtagAutoCompleteAdapter extends SimpleCursorAdapter implements Constants { private static final String[] FROM = new String[0]; private static final int[] TO = new int[0]; @NonNull private final ContentResolver mResolver; @NonNull private final SQLiteDatabase mDatabase; @NonNull private final MediaLoaderWrapper mProfileImageLoader; @NonNull private final SharedPreferencesWrapper mPreferences; @NonNull private final SharedPreferences mUserNicknamePreferences; private final EditText mEditText; private final boolean mDisplayProfileImage; private int mProfileImageUrlIdx, mNameIdx, mScreenNameIdx, mUserIdIdx; private char mToken = '@'; private long mAccountId; 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 = SharedPreferencesWrapper.getInstance(context, SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); mUserNicknamePreferences = context.getSharedPreferences(USER_NICKNAME_PREFERENCES_NAME, Context.MODE_PRIVATE); mResolver = context.getContentResolver(); final FiretweetApplication app = FiretweetApplication.getInstance(context); mProfileImageLoader = app.getMediaLoaderWrapper(); mDatabase = app.getSQLiteDatabase(); mDisplayProfileImage = mPreferences.getBoolean(KEY_DISPLAY_PROFILE_IMAGE, true); } 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) { text1.setText(getUserNickname(context, cursor.getLong(mUserIdIdx), cursor.getString(mNameIdx))); 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) { final String profileImageUrl = cursor.getString(mProfileImageUrlIdx); mProfileImageLoader.displayProfileImage(icon, profileImageUrl); } else { mProfileImageLoader.cancelDisplayTask(icon); // icon.setImageResource(R.drawable.ic_profile_image_default); } icon.clearColorFilter(); } else { icon.setImageResource(R.drawable.ic_action_hashtag); icon.setColorFilter(text1.getCurrentTextColor(), Mode.SRC_ATOP); } 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 constraintEscaped = constraint != null ? constraint.toString().replaceAll("_", "^_") : null; if (isAtSymbol(token)) { final Expression selection; final String[] selectionArgs; if (constraintEscaped != null) { final long[] nicknameIds = Utils.getMatchedNicknameIds(ParseUtils.parseString(constraint), mUserNicknamePreferences); selection = Expression.or(Expression.likeRaw(new Column(CachedUsers.SCREEN_NAME), "?||'%'", "^"), Expression.likeRaw(new Column(CachedUsers.NAME), "?||'%'", "^"), Expression.in(new Column(CachedUsers.USER_ID), new RawItemArray(nicknameIds))); selectionArgs = new String[] { constraintEscaped, constraintEscaped }; } else { selection = null; selectionArgs = null; } final OrderBy orderBy = new OrderBy( new String[] { CachedUsers.LAST_SEEN, "score", CachedUsers.SCREEN_NAME, CachedUsers.NAME }, new boolean[] { false, false, true, true }); final Cursor cursor = mResolver.query( Uri.withAppendedPath(CachedUsers.CONTENT_URI_WITH_SCORE, String.valueOf(mAccountId)), CachedUsers.BASIC_COLUMNS, selection != null ? selection.getSQL() : null, selectionArgs, orderBy.getSQL()); if (Utils.isDebugBuild() && cursor == null) throw new NullPointerException(); return cursor; } else { final String selection = constraintEscaped != null ? CachedHashtags.NAME + " LIKE ?||'%' ESCAPE '^'" : null; final String[] selectionArgs = constraintEscaped != null ? new String[] { constraintEscaped } : null; final Cursor cursor = mDatabase.query(true, CachedHashtags.TABLE_NAME, CachedHashtags.COLUMNS, selection, selectionArgs, null, null, CachedHashtags.NAME, null); if (Utils.isDebugBuild() && cursor == null) throw new NullPointerException(); return cursor; } } public void setAccountId(long accountId) { mAccountId = accountId; } @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 static boolean isAtSymbol(final char character) { switch (character) { case '\uff20': case '@': return true; } return false; } }