SuggestionsAdapter.java revision e678f46ec45076203f6260f8a26f56d838c6b6ff
1/* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.widget; 18 19import com.android.internal.R; 20 21import android.app.SearchDialog; 22import android.app.SearchManager; 23import android.app.SearchableInfo; 24import android.content.ComponentName; 25import android.content.ContentResolver; 26import android.content.Context; 27import android.content.ContentResolver.OpenResourceIdResult; 28import android.content.pm.ActivityInfo; 29import android.content.pm.PackageManager; 30import android.content.pm.PackageManager.NameNotFoundException; 31import android.content.res.ColorStateList; 32import android.content.res.Resources; 33import android.database.Cursor; 34import android.graphics.drawable.ColorDrawable; 35import android.graphics.drawable.Drawable; 36import android.graphics.drawable.StateListDrawable; 37import android.net.Uri; 38import android.os.Bundle; 39import android.text.Spannable; 40import android.text.SpannableString; 41import android.text.TextUtils; 42import android.text.style.TextAppearanceSpan; 43import android.util.Log; 44import android.util.SparseArray; 45import android.util.TypedValue; 46import android.view.View; 47import android.view.ViewGroup; 48import android.view.View.OnClickListener; 49 50import java.io.FileNotFoundException; 51import java.io.IOException; 52import java.io.InputStream; 53import java.util.WeakHashMap; 54 55/** 56 * Provides the contents for the suggestion drop-down list.in {@link SearchDialog}. 57 * 58 * @hide 59 */ 60class SuggestionsAdapter extends ResourceCursorAdapter implements OnClickListener { 61 62 private static final boolean DBG = false; 63 private static final String LOG_TAG = "SuggestionsAdapter"; 64 private static final int QUERY_LIMIT = 50; 65 66 static final int REFINE_NONE = 0; 67 static final int REFINE_BY_ENTRY = 1; 68 static final int REFINE_ALL = 2; 69 70 private SearchManager mSearchManager; 71 private SearchView mSearchView; 72 private SearchableInfo mSearchable; 73 private Context mProviderContext; 74 private WeakHashMap<String, Drawable.ConstantState> mOutsideDrawablesCache; 75 private boolean mClosed = false; 76 private int mQueryRefinement = REFINE_BY_ENTRY; 77 78 // URL color 79 private ColorStateList mUrlColor; 80 81 // Cached column indexes, updated when the cursor changes. 82 private int mText1Col; 83 private int mText2Col; 84 private int mText2UrlCol; 85 private int mIconName1Col; 86 private int mIconName2Col; 87 private int mFlagsCol; 88 89 static final int NONE = -1; 90 91 private final Runnable mStartSpinnerRunnable; 92 private final Runnable mStopSpinnerRunnable; 93 94 /** 95 * The amount of time we delay in the filter when the user presses the delete key. 96 * @see Filter#setDelayer(android.widget.Filter.Delayer). 97 */ 98 private static final long DELETE_KEY_POST_DELAY = 500L; 99 100 public SuggestionsAdapter(Context context, SearchView searchView, 101 SearchableInfo searchable, 102 WeakHashMap<String, Drawable.ConstantState> outsideDrawablesCache) { 103 super(context, 104 com.android.internal.R.layout.search_dropdown_item_icons_2line, 105 null, // no initial cursor 106 true); // auto-requery 107 mSearchManager = (SearchManager) mContext.getSystemService(Context.SEARCH_SERVICE); 108 mSearchView = searchView; 109 mSearchable = searchable; 110 // set up provider resources (gives us icons, etc.) 111 Context activityContext = mSearchable.getActivityContext(mContext); 112 mProviderContext = mSearchable.getProviderContext(mContext, activityContext); 113 114 mOutsideDrawablesCache = outsideDrawablesCache; 115 116 mStartSpinnerRunnable = new Runnable() { 117 public void run() { 118 // mSearchView.setWorking(true); // TODO: 119 } 120 }; 121 122 mStopSpinnerRunnable = new Runnable() { 123 public void run() { 124 // mSearchView.setWorking(false); // TODO: 125 } 126 }; 127 128 // delay 500ms when deleting 129 getFilter().setDelayer(new Filter.Delayer() { 130 131 private int mPreviousLength = 0; 132 133 public long getPostingDelay(CharSequence constraint) { 134 if (constraint == null) return 0; 135 136 long delay = constraint.length() < mPreviousLength ? DELETE_KEY_POST_DELAY : 0; 137 mPreviousLength = constraint.length(); 138 return delay; 139 } 140 }); 141 } 142 143 /** 144 * Enables query refinement for all suggestions. This means that an additional icon 145 * will be shown for each entry. When clicked, the suggested text on that line will be 146 * copied to the query text field. 147 * <p> 148 * 149 * @param refine which queries to refine. Possible values are {@link #REFINE_NONE}, 150 * {@link #REFINE_BY_ENTRY}, and {@link #REFINE_ALL}. 151 */ 152 public void setQueryRefinement(int refineWhat) { 153 mQueryRefinement = refineWhat; 154 } 155 156 /** 157 * Returns the current query refinement preference. 158 * @return value of query refinement preference 159 */ 160 public int getQueryRefinement() { 161 return mQueryRefinement; 162 } 163 164 /** 165 * Overridden to always return <code>false</code>, since we cannot be sure that 166 * suggestion sources return stable IDs. 167 */ 168 @Override 169 public boolean hasStableIds() { 170 return false; 171 } 172 173 /** 174 * Use the search suggestions provider to obtain a live cursor. This will be called 175 * in a worker thread, so it's OK if the query is slow (e.g. round trip for suggestions). 176 * The results will be processed in the UI thread and changeCursor() will be called. 177 */ 178 @Override 179 public Cursor runQueryOnBackgroundThread(CharSequence constraint) { 180 if (DBG) Log.d(LOG_TAG, "runQueryOnBackgroundThread(" + constraint + ")"); 181 String query = (constraint == null) ? "" : constraint.toString(); 182 /** 183 * for in app search we show the progress spinner until the cursor is returned with 184 * the results. 185 */ 186 Cursor cursor = null; 187 //mSearchView.getWindow().getDecorView().post(mStartSpinnerRunnable); // TODO: 188 try { 189 cursor = mSearchManager.getSuggestions(mSearchable, query, QUERY_LIMIT); 190 // trigger fill window so the spinner stays up until the results are copied over and 191 // closer to being ready 192 if (cursor != null) { 193 cursor.getCount(); 194 return cursor; 195 } 196 } catch (RuntimeException e) { 197 Log.w(LOG_TAG, "Search suggestions query threw an exception.", e); 198 } 199 // If cursor is null or an exception was thrown, stop the spinner and return null. 200 // changeCursor doesn't get called if cursor is null 201 // mSearchView.getWindow().getDecorView().post(mStopSpinnerRunnable); // TODO: 202 return null; 203 } 204 205 public void close() { 206 if (DBG) Log.d(LOG_TAG, "close()"); 207 changeCursor(null); 208 mClosed = true; 209 } 210 211 @Override 212 public void notifyDataSetChanged() { 213 if (DBG) Log.d(LOG_TAG, "notifyDataSetChanged"); 214 super.notifyDataSetChanged(); 215 216 // mSearchView.onDataSetChanged(); // TODO: 217 218 updateSpinnerState(getCursor()); 219 } 220 221 @Override 222 public void notifyDataSetInvalidated() { 223 if (DBG) Log.d(LOG_TAG, "notifyDataSetInvalidated"); 224 super.notifyDataSetInvalidated(); 225 226 updateSpinnerState(getCursor()); 227 } 228 229 private void updateSpinnerState(Cursor cursor) { 230 Bundle extras = cursor != null ? cursor.getExtras() : null; 231 if (DBG) { 232 Log.d(LOG_TAG, "updateSpinnerState - extra = " 233 + (extras != null 234 ? extras.getBoolean(SearchManager.CURSOR_EXTRA_KEY_IN_PROGRESS) 235 : null)); 236 } 237 // Check if the Cursor indicates that the query is not complete and show the spinner 238 if (extras != null 239 && extras.getBoolean(SearchManager.CURSOR_EXTRA_KEY_IN_PROGRESS)) { 240 // mSearchView.getWindow().getDecorView().post(mStartSpinnerRunnable); // TODO: 241 return; 242 } 243 // If cursor is null or is done, stop the spinner 244 // mSearchView.getWindow().getDecorView().post(mStopSpinnerRunnable); // TODO: 245 } 246 247 /** 248 * Cache columns. 249 */ 250 @Override 251 public void changeCursor(Cursor c) { 252 if (DBG) Log.d(LOG_TAG, "changeCursor(" + c + ")"); 253 254 if (mClosed) { 255 Log.w(LOG_TAG, "Tried to change cursor after adapter was closed."); 256 if (c != null) c.close(); 257 return; 258 } 259 260 try { 261 super.changeCursor(c); 262 263 if (c != null) { 264 mText1Col = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_TEXT_1); 265 mText2Col = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_TEXT_2); 266 mText2UrlCol = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_TEXT_2_URL); 267 mIconName1Col = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_ICON_1); 268 mIconName2Col = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_ICON_2); 269 mFlagsCol = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_FLAGS); 270 } 271 } catch (Exception e) { 272 Log.e(LOG_TAG, "error changing cursor and caching columns", e); 273 } 274 } 275 276 /** 277 * Tags the view with cached child view look-ups. 278 */ 279 @Override 280 public View newView(Context context, Cursor cursor, ViewGroup parent) { 281 View v = super.newView(context, cursor, parent); 282 v.setTag(new ChildViewCache(v)); 283 return v; 284 } 285 286 /** 287 * Cache of the child views of drop-drown list items, to avoid looking up the children 288 * each time the contents of a list item are changed. 289 */ 290 private final static class ChildViewCache { 291 public final TextView mText1; 292 public final TextView mText2; 293 public final ImageView mIcon1; 294 public final ImageView mIcon2; 295 public final ImageView mIconRefine; 296 297 public ChildViewCache(View v) { 298 mText1 = (TextView) v.findViewById(com.android.internal.R.id.text1); 299 mText2 = (TextView) v.findViewById(com.android.internal.R.id.text2); 300 mIcon1 = (ImageView) v.findViewById(com.android.internal.R.id.icon1); 301 mIcon2 = (ImageView) v.findViewById(com.android.internal.R.id.icon2); 302 mIconRefine = (ImageView) v.findViewById(com.android.internal.R.id.edit_query); 303 } 304 } 305 306 @Override 307 public void bindView(View view, Context context, Cursor cursor) { 308 ChildViewCache views = (ChildViewCache) view.getTag(); 309 310 int flags = 0; 311 if (mFlagsCol != -1) { 312 flags = cursor.getInt(mFlagsCol); 313 } 314 if (views.mText1 != null) { 315 String text1 = getStringOrNull(cursor, mText1Col); 316 setViewText(views.mText1, text1); 317 } 318 if (views.mText2 != null) { 319 // First check TEXT_2_URL 320 CharSequence text2 = getStringOrNull(cursor, mText2UrlCol); 321 if (text2 != null) { 322 text2 = formatUrl(text2); 323 } else { 324 text2 = getStringOrNull(cursor, mText2Col); 325 } 326 327 // If no second line of text is indicated, allow the first line of text 328 // to be up to two lines if it wants to be. 329 if (TextUtils.isEmpty(text2)) { 330 if (views.mText1 != null) { 331 views.mText1.setSingleLine(false); 332 views.mText1.setMaxLines(2); 333 } 334 } else { 335 if (views.mText1 != null) { 336 views.mText1.setSingleLine(true); 337 views.mText1.setMaxLines(1); 338 } 339 } 340 setViewText(views.mText2, text2); 341 } 342 343 if (views.mIcon1 != null) { 344 setViewDrawable(views.mIcon1, getIcon1(cursor)); 345 } 346 if (views.mIcon2 != null) { 347 setViewDrawable(views.mIcon2, getIcon2(cursor)); 348 } 349 if (mQueryRefinement == REFINE_ALL 350 || (mQueryRefinement == REFINE_BY_ENTRY 351 && (flags & SearchManager.FLAG_QUERY_REFINEMENT) != 0)) { 352 views.mIconRefine.setVisibility(View.VISIBLE); 353 views.mIconRefine.setTag(views.mText1.getText()); 354 views.mIconRefine.setOnClickListener(this); 355 } else { 356 views.mIconRefine.setVisibility(View.GONE); 357 } 358 } 359 360 public void onClick(View v) { 361 Object tag = v.getTag(); 362 if (tag instanceof CharSequence) { 363 mSearchView.onQueryRefine((CharSequence) tag); 364 } 365 } 366 367 private CharSequence formatUrl(CharSequence url) { 368 if (mUrlColor == null) { 369 // Lazily get the URL color from the current theme. 370 TypedValue colorValue = new TypedValue(); 371 mContext.getTheme().resolveAttribute(R.attr.textColorSearchUrl, colorValue, true); 372 mUrlColor = mContext.getResources().getColorStateList(colorValue.resourceId); 373 } 374 375 SpannableString text = new SpannableString(url); 376 text.setSpan(new TextAppearanceSpan(null, 0, 0, mUrlColor, null), 377 0, url.length(), 378 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 379 return text; 380 } 381 382 private void setViewText(TextView v, CharSequence text) { 383 // Set the text even if it's null, since we need to clear any previous text. 384 v.setText(text); 385 386 if (TextUtils.isEmpty(text)) { 387 v.setVisibility(View.GONE); 388 } else { 389 v.setVisibility(View.VISIBLE); 390 } 391 } 392 393 private Drawable getIcon1(Cursor cursor) { 394 if (mIconName1Col < 0) { 395 return null; 396 } 397 String value = cursor.getString(mIconName1Col); 398 Drawable drawable = getDrawableFromResourceValue(value); 399 if (drawable != null) { 400 return drawable; 401 } 402 return getDefaultIcon1(cursor); 403 } 404 405 private Drawable getIcon2(Cursor cursor) { 406 if (mIconName2Col < 0) { 407 return null; 408 } 409 String value = cursor.getString(mIconName2Col); 410 return getDrawableFromResourceValue(value); 411 } 412 413 /** 414 * Sets the drawable in an image view, makes sure the view is only visible if there 415 * is a drawable. 416 */ 417 private void setViewDrawable(ImageView v, Drawable drawable) { 418 // Set the icon even if the drawable is null, since we need to clear any 419 // previous icon. 420 v.setImageDrawable(drawable); 421 422 if (drawable == null) { 423 v.setVisibility(View.GONE); 424 } else { 425 v.setVisibility(View.VISIBLE); 426 427 // This is a hack to get any animated drawables (like a 'working' spinner) 428 // to animate. You have to setVisible true on an AnimationDrawable to get 429 // it to start animating, but it must first have been false or else the 430 // call to setVisible will be ineffective. We need to clear up the story 431 // about animated drawables in the future, see http://b/1878430. 432 drawable.setVisible(false, false); 433 drawable.setVisible(true, false); 434 } 435 } 436 437 /** 438 * Gets the text to show in the query field when a suggestion is selected. 439 * 440 * @param cursor The Cursor to read the suggestion data from. The Cursor should already 441 * be moved to the suggestion that is to be read from. 442 * @return The text to show, or <code>null</code> if the query should not be 443 * changed when selecting this suggestion. 444 */ 445 @Override 446 public CharSequence convertToString(Cursor cursor) { 447 if (cursor == null) { 448 return null; 449 } 450 451 String query = getColumnString(cursor, SearchManager.SUGGEST_COLUMN_QUERY); 452 if (query != null) { 453 return query; 454 } 455 456 if (mSearchable.shouldRewriteQueryFromData()) { 457 String data = getColumnString(cursor, SearchManager.SUGGEST_COLUMN_INTENT_DATA); 458 if (data != null) { 459 return data; 460 } 461 } 462 463 if (mSearchable.shouldRewriteQueryFromText()) { 464 String text1 = getColumnString(cursor, SearchManager.SUGGEST_COLUMN_TEXT_1); 465 if (text1 != null) { 466 return text1; 467 } 468 } 469 470 return null; 471 } 472 473 /** 474 * This method is overridden purely to provide a bit of protection against 475 * flaky content providers. 476 * 477 * @see android.widget.ListAdapter#getView(int, View, ViewGroup) 478 */ 479 @Override 480 public View getView(int position, View convertView, ViewGroup parent) { 481 try { 482 return super.getView(position, convertView, parent); 483 } catch (RuntimeException e) { 484 Log.w(LOG_TAG, "Search suggestions cursor threw exception.", e); 485 // Put exception string in item title 486 View v = newView(mContext, mCursor, parent); 487 if (v != null) { 488 ChildViewCache views = (ChildViewCache) v.getTag(); 489 TextView tv = views.mText1; 490 tv.setText(e.toString()); 491 } 492 return v; 493 } 494 } 495 496 /** 497 * Gets a drawable given a value provided by a suggestion provider. 498 * 499 * This value could be just the string value of a resource id 500 * (e.g., "2130837524"), in which case we will try to retrieve a drawable from 501 * the provider's resources. If the value is not an integer, it is 502 * treated as a Uri and opened with 503 * {@link ContentResolver#openOutputStream(android.net.Uri, String)}. 504 * 505 * All resources and URIs are read using the suggestion provider's context. 506 * 507 * If the string is not formatted as expected, or no drawable can be found for 508 * the provided value, this method returns null. 509 * 510 * @param drawableId a string like "2130837524", 511 * "android.resource://com.android.alarmclock/2130837524", 512 * or "content://contacts/photos/253". 513 * @return a Drawable, or null if none found 514 */ 515 private Drawable getDrawableFromResourceValue(String drawableId) { 516 if (drawableId == null || drawableId.length() == 0 || "0".equals(drawableId)) { 517 return null; 518 } 519 try { 520 // First, see if it's just an integer 521 int resourceId = Integer.parseInt(drawableId); 522 // It's an int, look for it in the cache 523 String drawableUri = ContentResolver.SCHEME_ANDROID_RESOURCE 524 + "://" + mProviderContext.getPackageName() + "/" + resourceId; 525 // Must use URI as cache key, since ints are app-specific 526 Drawable drawable = checkIconCache(drawableUri); 527 if (drawable != null) { 528 return drawable; 529 } 530 // Not cached, find it by resource ID 531 drawable = mProviderContext.getResources().getDrawable(resourceId); 532 // Stick it in the cache, using the URI as key 533 storeInIconCache(drawableUri, drawable); 534 return drawable; 535 } catch (NumberFormatException nfe) { 536 // It's not an integer, use it as a URI 537 Drawable drawable = checkIconCache(drawableId); 538 if (drawable != null) { 539 return drawable; 540 } 541 Uri uri = Uri.parse(drawableId); 542 drawable = getDrawable(uri); 543 storeInIconCache(drawableId, drawable); 544 return drawable; 545 } catch (Resources.NotFoundException nfe) { 546 // It was an integer, but it couldn't be found, bail out 547 Log.w(LOG_TAG, "Icon resource not found: " + drawableId); 548 return null; 549 } 550 } 551 552 /** 553 * Gets a drawable by URI, without using the cache. 554 * 555 * @return A drawable, or {@code null} if the drawable could not be loaded. 556 */ 557 private Drawable getDrawable(Uri uri) { 558 try { 559 String scheme = uri.getScheme(); 560 if (ContentResolver.SCHEME_ANDROID_RESOURCE.equals(scheme)) { 561 // Load drawables through Resources, to get the source density information 562 OpenResourceIdResult r = 563 mProviderContext.getContentResolver().getResourceId(uri); 564 try { 565 return r.r.getDrawable(r.id); 566 } catch (Resources.NotFoundException ex) { 567 throw new FileNotFoundException("Resource does not exist: " + uri); 568 } 569 } else { 570 // Let the ContentResolver handle content and file URIs. 571 InputStream stream = mProviderContext.getContentResolver().openInputStream(uri); 572 if (stream == null) { 573 throw new FileNotFoundException("Failed to open " + uri); 574 } 575 try { 576 return Drawable.createFromStream(stream, null); 577 } finally { 578 try { 579 stream.close(); 580 } catch (IOException ex) { 581 Log.e(LOG_TAG, "Error closing icon stream for " + uri, ex); 582 } 583 } 584 } 585 } catch (FileNotFoundException fnfe) { 586 Log.w(LOG_TAG, "Icon not found: " + uri + ", " + fnfe.getMessage()); 587 return null; 588 } 589 } 590 591 private Drawable checkIconCache(String resourceUri) { 592 Drawable.ConstantState cached = mOutsideDrawablesCache.get(resourceUri); 593 if (cached == null) { 594 return null; 595 } 596 if (DBG) Log.d(LOG_TAG, "Found icon in cache: " + resourceUri); 597 return cached.newDrawable(); 598 } 599 600 private void storeInIconCache(String resourceUri, Drawable drawable) { 601 if (drawable != null) { 602 mOutsideDrawablesCache.put(resourceUri, drawable.getConstantState()); 603 } 604 } 605 606 /** 607 * Gets the left-hand side icon that will be used for the current suggestion 608 * if the suggestion contains an icon column but no icon or a broken icon. 609 * 610 * @param cursor A cursor positioned at the current suggestion. 611 * @return A non-null drawable. 612 */ 613 private Drawable getDefaultIcon1(Cursor cursor) { 614 // Check the component that gave us the suggestion 615 Drawable drawable = getActivityIconWithCache(mSearchable.getSearchActivity()); 616 if (drawable != null) { 617 return drawable; 618 } 619 620 // Fall back to a default icon 621 return mContext.getPackageManager().getDefaultActivityIcon(); 622 } 623 624 /** 625 * Gets the activity or application icon for an activity. 626 * Uses the local icon cache for fast repeated lookups. 627 * 628 * @param component Name of an activity. 629 * @return A drawable, or {@code null} if neither the activity nor the application 630 * has an icon set. 631 */ 632 private Drawable getActivityIconWithCache(ComponentName component) { 633 // First check the icon cache 634 String componentIconKey = component.flattenToShortString(); 635 // Using containsKey() since we also store null values. 636 if (mOutsideDrawablesCache.containsKey(componentIconKey)) { 637 Drawable.ConstantState cached = mOutsideDrawablesCache.get(componentIconKey); 638 return cached == null ? null : cached.newDrawable(mProviderContext.getResources()); 639 } 640 // Then try the activity or application icon 641 Drawable drawable = getActivityIcon(component); 642 // Stick it in the cache so we don't do this lookup again. 643 Drawable.ConstantState toCache = drawable == null ? null : drawable.getConstantState(); 644 mOutsideDrawablesCache.put(componentIconKey, toCache); 645 return drawable; 646 } 647 648 /** 649 * Gets the activity or application icon for an activity. 650 * 651 * @param component Name of an activity. 652 * @return A drawable, or {@code null} if neither the acitivy or the application 653 * have an icon set. 654 */ 655 private Drawable getActivityIcon(ComponentName component) { 656 PackageManager pm = mContext.getPackageManager(); 657 final ActivityInfo activityInfo; 658 try { 659 activityInfo = pm.getActivityInfo(component, PackageManager.GET_META_DATA); 660 } catch (NameNotFoundException ex) { 661 Log.w(LOG_TAG, ex.toString()); 662 return null; 663 } 664 int iconId = activityInfo.getIconResource(); 665 if (iconId == 0) return null; 666 String pkg = component.getPackageName(); 667 Drawable drawable = pm.getDrawable(pkg, iconId, activityInfo.applicationInfo); 668 if (drawable == null) { 669 Log.w(LOG_TAG, "Invalid icon resource " + iconId + " for " 670 + component.flattenToShortString()); 671 return null; 672 } 673 return drawable; 674 } 675 676 /** 677 * Gets the value of a string column by name. 678 * 679 * @param cursor Cursor to read the value from. 680 * @param columnName The name of the column to read. 681 * @return The value of the given column, or <code>null</null> 682 * if the cursor does not contain the given column. 683 */ 684 public static String getColumnString(Cursor cursor, String columnName) { 685 int col = cursor.getColumnIndex(columnName); 686 return getStringOrNull(cursor, col); 687 } 688 689 private static String getStringOrNull(Cursor cursor, int col) { 690 if (col == NONE) { 691 return null; 692 } 693 try { 694 return cursor.getString(col); 695 } catch (Exception e) { 696 Log.e(LOG_TAG, 697 "unexpected error retrieving valid column from cursor, " 698 + "did the remote process die?", e); 699 return null; 700 } 701 } 702} 703