Java tutorial
/* * Twidere - Twitter client for Android * * Copyright (C) 2012 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.mariotaku.twidere.adapter; import org.mariotaku.twidere.Constants; import org.mariotaku.twidere.R; import org.mariotaku.twidere.app.TwidereApplication; import org.mariotaku.twidere.provider.TweetStore.CachedHashtags; import org.mariotaku.twidere.provider.TweetStore.CachedUsers; import org.mariotaku.twidere.provider.TweetStore.CachedValues; import org.mariotaku.twidere.util.LazyImageLoader; import org.mariotaku.twidere.view.StatusComposeEditText; import android.content.ContentResolver; import android.content.Context; import android.content.SharedPreferences; import android.database.Cursor; import android.support.v4.widget.SimpleCursorAdapter; import android.view.View; import android.widget.FilterQueryProvider; import android.widget.ImageView; import android.widget.TextView; public class AutoCompleteAdapter 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.NAME, CachedUsers.SCREEN_NAME, CachedUsers.PROFILE_IMAGE_URL }; private final ContentResolver mResolver; private final LazyImageLoader mProfileImageLoader; private final SharedPreferences mPreferences; private final StatusComposeEditText mEditText; private final boolean mDisplayProfileImage; private Cursor mCursor; private int mProfileImageUrlIdx, mNameIdx, mScreenNameIdx; private char mToken = '@'; public AutoCompleteAdapter(final Context context) { this(context, null); } public AutoCompleteAdapter(final Context context, final StatusComposeEditText view) { super(context, R.layout.user_autocomplete_list_item, null, FROM, TO, 0); mEditText = view; mPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); mResolver = context.getContentResolver(); final Context app_context = context.getApplicationContext(); mProfileImageLoader = app_context instanceof TwidereApplication ? ((TwidereApplication) app_context).getProfileImageLoader() : null; mDisplayProfileImage = mPreferences != null ? mPreferences.getBoolean(PREFERENCE_KEY_DISPLAY_PROFILE_IMAGE, true) : true; } public AutoCompleteAdapter(final StatusComposeEditText 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); if (mScreenNameIdx != -1) { text1.setText(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 && mProfileImageLoader != null) { final String profile_image_url_string = cursor.getString(mProfileImageUrlIdx); mProfileImageLoader.displayImage(icon, profile_image_url_string); } else { icon.setImageResource(R.drawable.ic_profile_image_default); } } else { icon.setImageResource(R.drawable.ic_menu_hashtag); } super.bindView(view, context, cursor); } @Override public void changeCursor(final Cursor cursor) { if (cursor != null) { mNameIdx = cursor.getColumnIndex(CachedValues.NAME); mScreenNameIdx = cursor.getColumnIndex(CachedUsers.SCREEN_NAME); mProfileImageUrlIdx = cursor.getColumnIndex(CachedUsers.PROFILE_IMAGE_URL); } mCursor = cursor; super.changeCursor(mCursor); } public void closeCursor() { if (mCursor == null) return; if (!mCursor.isClosed()) { mCursor.close(); } mCursor = null; } @Override public CharSequence convertToString(final Cursor cursor) { if (isCursorClosed()) return null; return cursor.getString(mScreenNameIdx != -1 ? mScreenNameIdx : mNameIdx); } public boolean isCursorClosed() { return mCursor == null || mCursor.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 CharSequence constraint_escaped = constraint != null ? constraint.toString().replaceAll("_", "^_") : null; if (isAtSymbol(token)) { final StringBuilder where = new StringBuilder(); where.append(CachedUsers.SCREEN_NAME + " LIKE '" + constraint_escaped + "%' ESCAPE '^'"); where.append(" OR "); where.append(CachedUsers.NAME + " LIKE '" + constraint_escaped + "%' ESCAPE '^'"); return mResolver.query(CachedUsers.CONTENT_URI, CACHED_USERS_COLUMNS, constraint_escaped != null ? where.toString() : null, null, null); } else { final String where = CachedHashtags.NAME + " LIKE '" + constraint_escaped + "%' ESCAPE '^'"; return mResolver.query(CachedHashtags.CONTENT_URI, CachedHashtags.COLUMNS, constraint_escaped != null ? where : null, null, null); } } private static boolean isAtSymbol(final char character) { switch (character) { case '\uff20': case '@': return true; } return false; } }