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 17 package android.widget; 18 19 import android.app.SearchDialog; 20 import android.app.SearchManager; 21 import android.app.SearchableInfo; 22 import android.content.ComponentName; 23 import android.content.ContentResolver; 24 import android.content.ContentResolver.OpenResourceIdResult; 25 import android.content.Context; 26 import android.content.pm.ActivityInfo; 27 import android.content.pm.PackageManager; 28 import android.content.pm.PackageManager.NameNotFoundException; 29 import android.content.res.ColorStateList; 30 import android.content.res.Resources; 31 import android.database.Cursor; 32 import android.graphics.drawable.Drawable; 33 import android.net.Uri; 34 import android.os.Bundle; 35 import android.text.Spannable; 36 import android.text.SpannableString; 37 import android.text.TextUtils; 38 import android.text.style.TextAppearanceSpan; 39 import android.util.Log; 40 import android.util.TypedValue; 41 import android.view.View; 42 import android.view.View.OnClickListener; 43 import android.view.ViewGroup; 44 45 import com.android.internal.R; 46 47 import java.io.FileNotFoundException; 48 import java.io.IOException; 49 import java.io.InputStream; 50 import java.util.WeakHashMap; 51 52 /** 53 * Provides the contents for the suggestion drop-down list.in {@link SearchDialog}. 54 * 55 * @hide 56 */ 57 class SuggestionsAdapter extends ResourceCursorAdapter implements OnClickListener { 58 59 private static final boolean DBG = false; 60 private static final String LOG_TAG = "SuggestionsAdapter"; 61 private static final int QUERY_LIMIT = 50; 62 63 static final int REFINE_NONE = 0; 64 static final int REFINE_BY_ENTRY = 1; 65 static final int REFINE_ALL = 2; 66 67 private final SearchManager mSearchManager; 68 private final SearchView mSearchView; 69 private final SearchableInfo mSearchable; 70 private final Context mProviderContext; 71 private final WeakHashMap<String, Drawable.ConstantState> mOutsideDrawablesCache; 72 private final int mCommitIconResId; 73 74 private boolean mClosed = false; 75 private int mQueryRefinement = REFINE_BY_ENTRY; 76 77 // URL color 78 private ColorStateList mUrlColor; 79 80 static final int INVALID_INDEX = -1; 81 82 // Cached column indexes, updated when the cursor changes. 83 private int mText1Col = INVALID_INDEX; 84 private int mText2Col = INVALID_INDEX; 85 private int mText2UrlCol = INVALID_INDEX; 86 private int mIconName1Col = INVALID_INDEX; 87 private int mIconName2Col = INVALID_INDEX; 88 private int mFlagsCol = INVALID_INDEX; 89 90 // private final Runnable mStartSpinnerRunnable; 91 // private final Runnable mStopSpinnerRunnable; 92 93 /** 94 * The amount of time we delay in the filter when the user presses the delete key. 95 * @see Filter#setDelayer(android.widget.Filter.Delayer). 96 */ 97 private static final long DELETE_KEY_POST_DELAY = 500L; 98 99 public SuggestionsAdapter(Context context, SearchView searchView, SearchableInfo searchable, 100 WeakHashMap<String, Drawable.ConstantState> outsideDrawablesCache) { 101 super(context, searchView.getSuggestionRowLayout(), null /* no initial cursor */, 102 true /* auto-requery */); 103 104 mSearchManager = (SearchManager) mContext.getSystemService(Context.SEARCH_SERVICE); 105 mSearchView = searchView; 106 mSearchable = searchable; 107 mCommitIconResId = searchView.getSuggestionCommitIconResId(); 108 109 // set up provider resources (gives us icons, etc.) 110 final Context activityContext = mSearchable.getActivityContext(mContext); 111 mProviderContext = mSearchable.getProviderContext(mContext, activityContext); 112 113 mOutsideDrawablesCache = outsideDrawablesCache; 114 115 // mStartSpinnerRunnable = new Runnable() { 116 // public void run() { 117 // // mSearchView.setWorking(true); // TODO: 118 // } 119 // }; 120 // 121 // mStopSpinnerRunnable = new Runnable() { 122 // public void run() { 123 // // mSearchView.setWorking(false); // TODO: 124 // } 125 // }; 126 127 // delay 500ms when deleting 128 getFilter().setDelayer(new Filter.Delayer() { 129 130 private int mPreviousLength = 0; 131 132 public long getPostingDelay(CharSequence constraint) { 133 if (constraint == null) return 0; 134 135 long delay = constraint.length() < mPreviousLength ? DELETE_KEY_POST_DELAY : 0; 136 mPreviousLength = constraint.length(); 137 return delay; 138 } 139 }); 140 } 141 142 /** 143 * Enables query refinement for all suggestions. This means that an additional icon 144 * will be shown for each entry. When clicked, the suggested text on that line will be 145 * copied to the query text field. 146 * <p> 147 * 148 * @param refineWhat which queries to refine. Possible values are 149 * {@link #REFINE_NONE}, {@link #REFINE_BY_ENTRY}, and 150 * {@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 if (mSearchView.getVisibility() != View.VISIBLE 188 || mSearchView.getWindowVisibility() != View.VISIBLE) { 189 return null; 190 } 191 //mSearchView.getWindow().getDecorView().post(mStartSpinnerRunnable); // TODO: 192 try { 193 cursor = mSearchManager.getSuggestions(mSearchable, query, QUERY_LIMIT); 194 // trigger fill window so the spinner stays up until the results are copied over and 195 // closer to being ready 196 if (cursor != null) { 197 cursor.getCount(); 198 return cursor; 199 } 200 } catch (RuntimeException e) { 201 Log.w(LOG_TAG, "Search suggestions query threw an exception.", e); 202 } 203 // If cursor is null or an exception was thrown, stop the spinner and return null. 204 // changeCursor doesn't get called if cursor is null 205 // mSearchView.getWindow().getDecorView().post(mStopSpinnerRunnable); // TODO: 206 return null; 207 } 208 209 public void close() { 210 if (DBG) Log.d(LOG_TAG, "close()"); 211 changeCursor(null); 212 mClosed = true; 213 } 214 215 @Override 216 public void notifyDataSetChanged() { 217 if (DBG) Log.d(LOG_TAG, "notifyDataSetChanged"); 218 super.notifyDataSetChanged(); 219 220 // mSearchView.onDataSetChanged(); // TODO: 221 222 updateSpinnerState(getCursor()); 223 } 224 225 @Override 226 public void notifyDataSetInvalidated() { 227 if (DBG) Log.d(LOG_TAG, "notifyDataSetInvalidated"); 228 super.notifyDataSetInvalidated(); 229 230 updateSpinnerState(getCursor()); 231 } 232 233 private void updateSpinnerState(Cursor cursor) { 234 Bundle extras = cursor != null ? cursor.getExtras() : null; 235 if (DBG) { 236 Log.d(LOG_TAG, "updateSpinnerState - extra = " 237 + (extras != null 238 ? extras.getBoolean(SearchManager.CURSOR_EXTRA_KEY_IN_PROGRESS) 239 : null)); 240 } 241 // Check if the Cursor indicates that the query is not complete and show the spinner 242 if (extras != null 243 && extras.getBoolean(SearchManager.CURSOR_EXTRA_KEY_IN_PROGRESS)) { 244 // mSearchView.getWindow().getDecorView().post(mStartSpinnerRunnable); // TODO: 245 return; 246 } 247 // If cursor is null or is done, stop the spinner 248 // mSearchView.getWindow().getDecorView().post(mStopSpinnerRunnable); // TODO: 249 } 250 251 /** 252 * Cache columns. 253 */ 254 @Override 255 public void changeCursor(Cursor c) { 256 if (DBG) Log.d(LOG_TAG, "changeCursor(" + c + ")"); 257 258 if (mClosed) { 259 Log.w(LOG_TAG, "Tried to change cursor after adapter was closed."); 260 if (c != null) c.close(); 261 return; 262 } 263 264 try { 265 super.changeCursor(c); 266 267 if (c != null) { 268 mText1Col = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_TEXT_1); 269 mText2Col = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_TEXT_2); 270 mText2UrlCol = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_TEXT_2_URL); 271 mIconName1Col = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_ICON_1); 272 mIconName2Col = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_ICON_2); 273 mFlagsCol = c.getColumnIndex(SearchManager.SUGGEST_COLUMN_FLAGS); 274 } 275 } catch (Exception e) { 276 Log.e(LOG_TAG, "error changing cursor and caching columns", e); 277 } 278 } 279 280 /** 281 * Tags the view with cached child view look-ups. 282 */ 283 @Override 284 public View newView(Context context, Cursor cursor, ViewGroup parent) { 285 final View v = super.newView(context, cursor, parent); 286 v.setTag(new ChildViewCache(v)); 287 288 // Set up icon. 289 final ImageView iconRefine = v.findViewById(R.id.edit_query); 290 iconRefine.setImageResource(mCommitIconResId); 291 292 return v; 293 } 294 295 /** 296 * Cache of the child views of drop-drown list items, to avoid looking up the children 297 * each time the contents of a list item are changed. 298 */ 299 private final static class ChildViewCache { 300 public final TextView mText1; 301 public final TextView mText2; 302 public final ImageView mIcon1; 303 public final ImageView mIcon2; 304 public final ImageView mIconRefine; 305 306 public ChildViewCache(View v) { 307 mText1 = v.findViewById(com.android.internal.R.id.text1); 308 mText2 = v.findViewById(com.android.internal.R.id.text2); 309 mIcon1 = v.findViewById(com.android.internal.R.id.icon1); 310 mIcon2 = v.findViewById(com.android.internal.R.id.icon2); 311 mIconRefine = v.findViewById(com.android.internal.R.id.edit_query); 312 } 313 } 314 315 @Override 316 public void bindView(View view, Context context, Cursor cursor) { 317 ChildViewCache views = (ChildViewCache) view.getTag(); 318 319 int flags = 0; 320 if (mFlagsCol != INVALID_INDEX) { 321 flags = cursor.getInt(mFlagsCol); 322 } 323 if (views.mText1 != null) { 324 String text1 = getStringOrNull(cursor, mText1Col); 325 setViewText(views.mText1, text1); 326 } 327 if (views.mText2 != null) { 328 // First check TEXT_2_URL 329 CharSequence text2 = getStringOrNull(cursor, mText2UrlCol); 330 if (text2 != null) { 331 text2 = formatUrl(context, text2); 332 } else { 333 text2 = getStringOrNull(cursor, mText2Col); 334 } 335 336 // If no second line of text is indicated, allow the first line of text 337 // to be up to two lines if it wants to be. 338 if (TextUtils.isEmpty(text2)) { 339 if (views.mText1 != null) { 340 views.mText1.setSingleLine(false); 341 views.mText1.setMaxLines(2); 342 } 343 } else { 344 if (views.mText1 != null) { 345 views.mText1.setSingleLine(true); 346 views.mText1.setMaxLines(1); 347 } 348 } 349 setViewText(views.mText2, text2); 350 } 351 352 if (views.mIcon1 != null) { 353 setViewDrawable(views.mIcon1, getIcon1(cursor), View.INVISIBLE); 354 } 355 if (views.mIcon2 != null) { 356 setViewDrawable(views.mIcon2, getIcon2(cursor), View.GONE); 357 } 358 if (mQueryRefinement == REFINE_ALL 359 || (mQueryRefinement == REFINE_BY_ENTRY 360 && (flags & SearchManager.FLAG_QUERY_REFINEMENT) != 0)) { 361 views.mIconRefine.setVisibility(View.VISIBLE); 362 views.mIconRefine.setTag(views.mText1.getText()); 363 views.mIconRefine.setOnClickListener(this); 364 } else { 365 views.mIconRefine.setVisibility(View.GONE); 366 } 367 } 368 369 public void onClick(View v) { 370 Object tag = v.getTag(); 371 if (tag instanceof CharSequence) { 372 mSearchView.onQueryRefine((CharSequence) tag); 373 } 374 } 375 376 private CharSequence formatUrl(Context context, CharSequence url) { 377 if (mUrlColor == null) { 378 // Lazily get the URL color from the current theme. 379 TypedValue colorValue = new TypedValue(); 380 context.getTheme().resolveAttribute(R.attr.textColorSearchUrl, colorValue, true); 381 mUrlColor = context.getColorStateList(colorValue.resourceId); 382 } 383 384 SpannableString text = new SpannableString(url); 385 text.setSpan(new TextAppearanceSpan(null, 0, 0, mUrlColor, null), 386 0, url.length(), 387 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 388 return text; 389 } 390 391 private void setViewText(TextView v, CharSequence text) { 392 // Set the text even if it's null, since we need to clear any previous text. 393 v.setText(text); 394 395 if (TextUtils.isEmpty(text)) { 396 v.setVisibility(View.GONE); 397 } else { 398 v.setVisibility(View.VISIBLE); 399 } 400 } 401 402 private Drawable getIcon1(Cursor cursor) { 403 if (mIconName1Col == INVALID_INDEX) { 404 return null; 405 } 406 String value = cursor.getString(mIconName1Col); 407 Drawable drawable = getDrawableFromResourceValue(value); 408 if (drawable != null) { 409 return drawable; 410 } 411 return getDefaultIcon1(cursor); 412 } 413 414 private Drawable getIcon2(Cursor cursor) { 415 if (mIconName2Col == INVALID_INDEX) { 416 return null; 417 } 418 String value = cursor.getString(mIconName2Col); 419 return getDrawableFromResourceValue(value); 420 } 421 422 /** 423 * Sets the drawable in an image view, makes sure the view is only visible if there 424 * is a drawable. 425 */ 426 private void setViewDrawable(ImageView v, Drawable drawable, int nullVisibility) { 427 // Set the icon even if the drawable is null, since we need to clear any 428 // previous icon. 429 v.setImageDrawable(drawable); 430 431 if (drawable == null) { 432 v.setVisibility(nullVisibility); 433 } else { 434 v.setVisibility(View.VISIBLE); 435 436 // This is a hack to get any animated drawables (like a 'working' spinner) 437 // to animate. You have to setVisible true on an AnimationDrawable to get 438 // it to start animating, but it must first have been false or else the 439 // call to setVisible will be ineffective. We need to clear up the story 440 // about animated drawables in the future, see http://b/1878430. 441 drawable.setVisible(false, false); 442 drawable.setVisible(true, false); 443 } 444 } 445 446 /** 447 * Gets the text to show in the query field when a suggestion is selected. 448 * 449 * @param cursor The Cursor to read the suggestion data from. The Cursor should already 450 * be moved to the suggestion that is to be read from. 451 * @return The text to show, or <code>null</code> if the query should not be 452 * changed when selecting this suggestion. 453 */ 454 @Override 455 public CharSequence convertToString(Cursor cursor) { 456 if (cursor == null) { 457 return null; 458 } 459 460 String query = getColumnString(cursor, SearchManager.SUGGEST_COLUMN_QUERY); 461 if (query != null) { 462 return query; 463 } 464 465 if (mSearchable.shouldRewriteQueryFromData()) { 466 String data = getColumnString(cursor, SearchManager.SUGGEST_COLUMN_INTENT_DATA); 467 if (data != null) { 468 return data; 469 } 470 } 471 472 if (mSearchable.shouldRewriteQueryFromText()) { 473 String text1 = getColumnString(cursor, SearchManager.SUGGEST_COLUMN_TEXT_1); 474 if (text1 != null) { 475 return text1; 476 } 477 } 478 479 return null; 480 } 481 482 /** 483 * This method is overridden purely to provide a bit of protection against 484 * flaky content providers. 485 * 486 * @see android.widget.ListAdapter#getView(int, View, ViewGroup) 487 */ 488 @Override 489 public View getView(int position, View convertView, ViewGroup parent) { 490 try { 491 return super.getView(position, convertView, parent); 492 } catch (RuntimeException e) { 493 Log.w(LOG_TAG, "Search suggestions cursor threw exception.", e); 494 // Put exception string in item title 495 View v = newView(mContext, mCursor, parent); 496 if (v != null) { 497 ChildViewCache views = (ChildViewCache) v.getTag(); 498 TextView tv = views.mText1; 499 tv.setText(e.toString()); 500 } 501 return v; 502 } 503 } 504 505 /** 506 * This method is overridden purely to provide a bit of protection against 507 * flaky content providers. 508 * 509 * @see android.widget.CursorAdapter#getDropDownView(int, View, ViewGroup) 510 */ 511 @Override 512 public View getDropDownView(int position, View convertView, ViewGroup parent) { 513 try { 514 return super.getDropDownView(position, convertView, parent); 515 } catch (RuntimeException e) { 516 Log.w(LOG_TAG, "Search suggestions cursor threw exception.", e); 517 // Put exception string in item title 518 final Context context = mDropDownContext == null ? mContext : mDropDownContext; 519 final View v = newDropDownView(context, mCursor, parent); 520 if (v != null) { 521 final ChildViewCache views = (ChildViewCache) v.getTag(); 522 final TextView tv = views.mText1; 523 tv.setText(e.toString()); 524 } 525 return v; 526 } 527 } 528 529 /** 530 * Gets a drawable given a value provided by a suggestion provider. 531 * 532 * This value could be just the string value of a resource id 533 * (e.g., "2130837524"), in which case we will try to retrieve a drawable from 534 * the provider's resources. If the value is not an integer, it is 535 * treated as a Uri and opened with 536 * {@link ContentResolver#openOutputStream(android.net.Uri, String)}. 537 * 538 * All resources and URIs are read using the suggestion provider's context. 539 * 540 * If the string is not formatted as expected, or no drawable can be found for 541 * the provided value, this method returns null. 542 * 543 * @param drawableId a string like "2130837524", 544 * "android.resource://com.android.alarmclock/2130837524", 545 * or "content://contacts/photos/253". 546 * @return a Drawable, or null if none found 547 */ 548 private Drawable getDrawableFromResourceValue(String drawableId) { 549 if (drawableId == null || drawableId.length() == 0 || "0".equals(drawableId)) { 550 return null; 551 } 552 try { 553 // First, see if it's just an integer 554 int resourceId = Integer.parseInt(drawableId); 555 // It's an int, look for it in the cache 556 String drawableUri = ContentResolver.SCHEME_ANDROID_RESOURCE 557 + "://" + mProviderContext.getPackageName() + "/" + resourceId; 558 // Must use URI as cache key, since ints are app-specific 559 Drawable drawable = checkIconCache(drawableUri); 560 if (drawable != null) { 561 return drawable; 562 } 563 // Not cached, find it by resource ID 564 drawable = mProviderContext.getDrawable(resourceId); 565 // Stick it in the cache, using the URI as key 566 storeInIconCache(drawableUri, drawable); 567 return drawable; 568 } catch (NumberFormatException nfe) { 569 // It's not an integer, use it as a URI 570 Drawable drawable = checkIconCache(drawableId); 571 if (drawable != null) { 572 return drawable; 573 } 574 Uri uri = Uri.parse(drawableId); 575 drawable = getDrawable(uri); 576 storeInIconCache(drawableId, drawable); 577 return drawable; 578 } catch (Resources.NotFoundException nfe) { 579 // It was an integer, but it couldn't be found, bail out 580 Log.w(LOG_TAG, "Icon resource not found: " + drawableId); 581 return null; 582 } 583 } 584 585 /** 586 * Gets a drawable by URI, without using the cache. 587 * 588 * @return A drawable, or {@code null} if the drawable could not be loaded. 589 */ 590 private Drawable getDrawable(Uri uri) { 591 try { 592 String scheme = uri.getScheme(); 593 if (ContentResolver.SCHEME_ANDROID_RESOURCE.equals(scheme)) { 594 // Load drawables through Resources, to get the source density information 595 OpenResourceIdResult r = 596 mProviderContext.getContentResolver().getResourceId(uri); 597 try { 598 return r.r.getDrawable(r.id, mProviderContext.getTheme()); 599 } catch (Resources.NotFoundException ex) { 600 throw new FileNotFoundException("Resource does not exist: " + uri); 601 } 602 } else { 603 // Let the ContentResolver handle content and file URIs. 604 InputStream stream = mProviderContext.getContentResolver().openInputStream(uri); 605 if (stream == null) { 606 throw new FileNotFoundException("Failed to open " + uri); 607 } 608 try { 609 return Drawable.createFromStream(stream, null); 610 } finally { 611 try { 612 stream.close(); 613 } catch (IOException ex) { 614 Log.e(LOG_TAG, "Error closing icon stream for " + uri, ex); 615 } 616 } 617 } 618 } catch (FileNotFoundException fnfe) { 619 Log.w(LOG_TAG, "Icon not found: " + uri + ", " + fnfe.getMessage()); 620 return null; 621 } 622 } 623 624 private Drawable checkIconCache(String resourceUri) { 625 Drawable.ConstantState cached = mOutsideDrawablesCache.get(resourceUri); 626 if (cached == null) { 627 return null; 628 } 629 if (DBG) Log.d(LOG_TAG, "Found icon in cache: " + resourceUri); 630 return cached.newDrawable(); 631 } 632 633 private void storeInIconCache(String resourceUri, Drawable drawable) { 634 if (drawable != null) { 635 mOutsideDrawablesCache.put(resourceUri, drawable.getConstantState()); 636 } 637 } 638 639 /** 640 * Gets the left-hand side icon that will be used for the current suggestion 641 * if the suggestion contains an icon column but no icon or a broken icon. 642 * 643 * @param cursor A cursor positioned at the current suggestion. 644 * @return A non-null drawable. 645 */ 646 private Drawable getDefaultIcon1(Cursor cursor) { 647 // Check the component that gave us the suggestion 648 Drawable drawable = getActivityIconWithCache(mSearchable.getSearchActivity()); 649 if (drawable != null) { 650 return drawable; 651 } 652 653 // Fall back to a default icon 654 return mContext.getPackageManager().getDefaultActivityIcon(); 655 } 656 657 /** 658 * Gets the activity or application icon for an activity. 659 * Uses the local icon cache for fast repeated lookups. 660 * 661 * @param component Name of an activity. 662 * @return A drawable, or {@code null} if neither the activity nor the application 663 * has an icon set. 664 */ 665 private Drawable getActivityIconWithCache(ComponentName component) { 666 // First check the icon cache 667 String componentIconKey = component.flattenToShortString(); 668 // Using containsKey() since we also store null values. 669 if (mOutsideDrawablesCache.containsKey(componentIconKey)) { 670 Drawable.ConstantState cached = mOutsideDrawablesCache.get(componentIconKey); 671 return cached == null ? null : cached.newDrawable(mProviderContext.getResources()); 672 } 673 // Then try the activity or application icon 674 Drawable drawable = getActivityIcon(component); 675 // Stick it in the cache so we don't do this lookup again. 676 Drawable.ConstantState toCache = drawable == null ? null : drawable.getConstantState(); 677 mOutsideDrawablesCache.put(componentIconKey, toCache); 678 return drawable; 679 } 680 681 /** 682 * Gets the activity or application icon for an activity. 683 * 684 * @param component Name of an activity. 685 * @return A drawable, or {@code null} if neither the acitivy or the application 686 * have an icon set. 687 */ 688 private Drawable getActivityIcon(ComponentName component) { 689 PackageManager pm = mContext.getPackageManager(); 690 final ActivityInfo activityInfo; 691 try { 692 activityInfo = pm.getActivityInfo(component, PackageManager.GET_META_DATA); 693 } catch (NameNotFoundException ex) { 694 Log.w(LOG_TAG, ex.toString()); 695 return null; 696 } 697 int iconId = activityInfo.getIconResource(); 698 if (iconId == 0) return null; 699 String pkg = component.getPackageName(); 700 Drawable drawable = pm.getDrawable(pkg, iconId, activityInfo.applicationInfo); 701 if (drawable == null) { 702 Log.w(LOG_TAG, "Invalid icon resource " + iconId + " for " 703 + component.flattenToShortString()); 704 return null; 705 } 706 return drawable; 707 } 708 709 /** 710 * Gets the value of a string column by name. 711 * 712 * @param cursor Cursor to read the value from. 713 * @param columnName The name of the column to read. 714 * @return The value of the given column, or <code>null</null> 715 * if the cursor does not contain the given column. 716 */ 717 public static String getColumnString(Cursor cursor, String columnName) { 718 int col = cursor.getColumnIndex(columnName); 719 return getStringOrNull(cursor, col); 720 } 721 722 private static String getStringOrNull(Cursor cursor, int col) { 723 if (col == INVALID_INDEX) { 724 return null; 725 } 726 try { 727 return cursor.getString(col); 728 } catch (Exception e) { 729 Log.e(LOG_TAG, 730 "unexpected error retrieving valid column from cursor, " 731 + "did the remote process die?", e); 732 return null; 733 } 734 } 735 } 736
