src/com/android/settings/ActivityPicker.java - platform/packages/apps/Settings - Git at Google

 /*
  * Copyright (C) 2009 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.settings;

 import android.app.Activity;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.Intent.ShortcutIconResource;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.ResolveInfo;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
 import android.graphics.PaintFlagsDrawFilter;
 import android.graphics.PixelFormat;
 import android.graphics.Rect;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.PaintDrawable;
 import android.os.Bundle;
 import android.os.Parcelable;
 import android.util.DisplayMetrics;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.TextView;

 import com.android.internal.app.AlertActivity;
 import com.android.internal.app.AlertController;

 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;

 /**
  * Displays a list of all activities matching the incoming
  * {@link Intent#EXTRA_INTENT} query, along with any injected items.
  */
 public class ActivityPicker extends AlertActivity implements
         DialogInterface.OnClickListener, DialogInterface.OnCancelListener {

     /**
      * Adapter of items that are displayed in this dialog.
      */
     private PickAdapter mAdapter;

     /**
      * Base {@link Intent} used when building list.
      */
     private Intent mBaseIntent;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         final Intent intent = getIntent();

         // Read base intent from extras, otherwise assume default
         Parcelable parcel = intent.getParcelableExtra(Intent.EXTRA_INTENT);
         if (parcel instanceof Intent) {
             mBaseIntent = (Intent) parcel;
             mBaseIntent.setFlags(mBaseIntent.getFlags() & ~(Intent.FLAG_GRANT_READ_URI_PERMISSION
                     | Intent.FLAG_GRANT_WRITE_URI_PERMISSION
                     | Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
                     | Intent.FLAG_GRANT_PREFIX_URI_PERMISSION));
         } else {
             mBaseIntent = new Intent(Intent.ACTION_MAIN, null);
             mBaseIntent.addCategory(Intent.CATEGORY_DEFAULT);
         }

         // Create dialog parameters
         AlertController.AlertParams params = mAlertParams;
         params.mOnClickListener = this;
         params.mOnCancelListener = this;

         // Use custom title if provided, otherwise default window title
         if (intent.hasExtra(Intent.EXTRA_TITLE)) {
             params.mTitle = intent.getStringExtra(Intent.EXTRA_TITLE);
         } else {
             params.mTitle = getTitle();
         }

         // Build list adapter of pickable items
         List<PickAdapter.Item> items = getItems();
         mAdapter = new PickAdapter(this, items);
         params.mAdapter = mAdapter;

         setupAlert();
     }

     /**
      * Handle clicking of dialog item by passing back
      * {@link #getIntentForPosition(int)} in {@link #setResult(int, Intent)}.
      */
     public void onClick(DialogInterface dialog, int which) {
         Intent intent = getIntentForPosition(which);
         setResult(Activity.RESULT_OK, intent);
         finish();
     }

     /**
      * Handle canceled dialog by passing back {@link Activity#RESULT_CANCELED}.
      */
     public void onCancel(DialogInterface dialog) {
         setResult(Activity.RESULT_CANCELED);
         finish();
     }

     /**
      * Build the specific {@link Intent} for a given list position. Convenience
      * method that calls through to {@link PickAdapter.Item#getIntent(Intent)}.
      */
     protected Intent getIntentForPosition(int position) {
         PickAdapter.Item item = (PickAdapter.Item) mAdapter.getItem(position);
         return item.getIntent(mBaseIntent);
     }

     /**
      * Build and return list of items to be shown in dialog. Default
      * implementation mixes activities matching {@link #mBaseIntent} from
      * {@link #putIntentItems(Intent, List)} with any injected items from
      * {@link Intent#EXTRA_SHORTCUT_NAME}. Override this method in subclasses to
      * change the items shown.
      */
     protected List<PickAdapter.Item> getItems() {
         PackageManager packageManager = getPackageManager();
         List<PickAdapter.Item> items = new ArrayList<PickAdapter.Item>();

         // Add any injected pick items
         final Intent intent = getIntent();
         ArrayList<String> labels =
             intent.getStringArrayListExtra(Intent.EXTRA_SHORTCUT_NAME);
         ArrayList<ShortcutIconResource> icons =
             intent.getParcelableArrayListExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE);

         if (labels != null && icons != null && labels.size() == icons.size()) {
             for (int i = 0; i < labels.size(); i++) {
                 String label = labels.get(i);
                 Drawable icon = null;

                 try {
                     // Try loading icon from requested package
                     ShortcutIconResource iconResource = icons.get(i);
                     Resources res = packageManager.getResourcesForApplication(
                             iconResource.packageName);
                     icon = res.getDrawable(res.getIdentifier(
                             iconResource.resourceName, null, null), null);
                 } catch (NameNotFoundException e) {
                     // Ignore
                 }

                 items.add(new PickAdapter.Item(this, label, icon));
             }
         }

         // Add any intent items if base was given
         if (mBaseIntent != null) {
             putIntentItems(mBaseIntent, items);
         }

         return items;
     }

     /**
      * Fill the given list with any activities matching the base {@link Intent}.
      */
     protected void putIntentItems(Intent baseIntent, List<PickAdapter.Item> items) {
         PackageManager packageManager = getPackageManager();
         List<ResolveInfo> list = packageManager.queryIntentActivities(baseIntent,
                 0 /* no flags */);
         Collections.sort(list, new ResolveInfo.DisplayNameComparator(packageManager));

         final int listSize = list.size();
         for (int i = 0; i < listSize; i++) {
             ResolveInfo resolveInfo = list.get(i);
             items.add(new PickAdapter.Item(this, packageManager, resolveInfo));
         }
     }

     /**
      * Adapter which shows the set of activities that can be performed for a
      * given {@link Intent}.
      */
     protected static class PickAdapter extends BaseAdapter {

         /**
          * Item that appears in a {@link PickAdapter} list.
          */
         public static class Item implements AppWidgetLoader.LabelledItem {
             protected static IconResizer sResizer;

             protected IconResizer getResizer(Context context) {
                 if (sResizer == null) {
                     final Resources resources = context.getResources();
                     int size = (int) resources.getDimension(android.R.dimen.app_icon_size);
                     sResizer = new IconResizer(size, size, resources.getDisplayMetrics());
                 }
                 return sResizer;
             }

             CharSequence label;
             Drawable icon;
             String packageName;
             String className;
             Bundle extras;

             /**
              * Create a list item from given label and icon.
              */
             Item(Context context, CharSequence label, Drawable icon) {
                 this.label = label;
                 this.icon = getResizer(context).createIconThumbnail(icon);
             }

             /**
              * Create a list item and fill it with details from the given
              * {@link ResolveInfo} object.
              */
             Item(Context context, PackageManager pm, ResolveInfo resolveInfo) {
                 label = resolveInfo.loadLabel(pm);
                 if (label == null && resolveInfo.activityInfo != null) {
                     label = resolveInfo.activityInfo.name;
                 }

                 icon = getResizer(context).createIconThumbnail(resolveInfo.loadIcon(pm));
                 packageName = resolveInfo.activityInfo.applicationInfo.packageName;
                 className = resolveInfo.activityInfo.name;
             }

             /**
              * Build the {@link Intent} described by this item. If this item
              * can't create a valid {@link android.content.ComponentName}, it will return
              * {@link Intent#ACTION_CREATE_SHORTCUT} filled with the item label.
              */
             Intent getIntent(Intent baseIntent) {
                 Intent intent = new Intent(baseIntent);
                 if (packageName != null && className != null) {
                     // Valid package and class, so fill details as normal intent
                     intent.setClassName(packageName, className);
                     if (extras != null) {
                         intent.putExtras(extras);
                     }
                 } else {
                     // No valid package or class, so treat as shortcut with label
                     intent.setAction(Intent.ACTION_CREATE_SHORTCUT);
                     intent.putExtra(Intent.EXTRA_SHORTCUT_NAME, label);
                 }
                 return intent;
             }

             public CharSequence getLabel() {
                 return label;
             }
         }

         private final LayoutInflater mInflater;
         private final List<Item> mItems;

         /**
          * Create an adapter for the given items.
          */
         public PickAdapter(Context context, List<Item> items) {
             mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
             mItems = items;
         }

         /**
          * {@inheritDoc}
          */
         public int getCount() {
             return mItems.size();
         }

         /**
          * {@inheritDoc}
          */
         public Object getItem(int position) {
             return mItems.get(position);
         }

         /**
          * {@inheritDoc}
          */
         public long getItemId(int position) {
             return position;
         }

         /**
          * {@inheritDoc}
          */
         public View getView(int position, View convertView, ViewGroup parent) {
             if (convertView == null) {
                 convertView = mInflater.inflate(R.layout.pick_item, parent, false);
             }

             Item item = (Item) getItem(position);
             TextView textView = (TextView) convertView;
             textView.setText(item.label);
             textView.setCompoundDrawablesWithIntrinsicBounds(item.icon, null, null, null);

             return convertView;
         }
     }

     /**
      * Utility class to resize icons to match default icon size. Code is mostly
      * borrowed from Launcher.
      */
     private static class IconResizer {
         private final int mIconWidth;
         private final int mIconHeight;

         private final DisplayMetrics mMetrics;
         private final Rect mOldBounds = new Rect();
         private final Canvas mCanvas = new Canvas();

         public IconResizer(int width, int height, DisplayMetrics metrics) {
             mCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
                     Paint.FILTER_BITMAP_FLAG));

             mMetrics = metrics;
             mIconWidth = width;
             mIconHeight = height;
         }

         /**
          * Returns a Drawable representing the thumbnail of the specified Drawable.
          * The size of the thumbnail is defined by the dimension
          * android.R.dimen.launcher_application_icon_size.
          *
          * This method is not thread-safe and should be invoked on the UI thread only.
          *
          * @param icon The icon to get a thumbnail of.
          *
          * @return A thumbnail for the specified icon or the icon itself if the
          *         thumbnail could not be created.
          */
         public Drawable createIconThumbnail(Drawable icon) {
             int width = mIconWidth;
             int height = mIconHeight;

             if (icon == null) {
                 return new EmptyDrawable(width, height);
             }

             try {
                 if (icon instanceof PaintDrawable) {
                     PaintDrawable painter = (PaintDrawable) icon;
                     painter.setIntrinsicWidth(width);
                     painter.setIntrinsicHeight(height);
                 } else if (icon instanceof BitmapDrawable) {
                     // Ensure the bitmap has a density.
                     BitmapDrawable bitmapDrawable = (BitmapDrawable) icon;
                     Bitmap bitmap = bitmapDrawable.getBitmap();
                     if (bitmap.getDensity() == Bitmap.DENSITY_NONE) {
                         bitmapDrawable.setTargetDensity(mMetrics);
                     }
                 }
                 int iconWidth = icon.getIntrinsicWidth();
                 int iconHeight = icon.getIntrinsicHeight();

                 if (iconWidth > 0 && iconHeight > 0) {
                     if (width < iconWidth || height < iconHeight) {
                         final float ratio = (float) iconWidth / iconHeight;

                         if (iconWidth > iconHeight) {
                             height = (int) (width / ratio);
                         } else if (iconHeight > iconWidth) {
                             width = (int) (height * ratio);
                         }

                         final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ?
                                     Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
                         final Bitmap thumb = Bitmap.createBitmap(mIconWidth, mIconHeight, c);
                         final Canvas canvas = mCanvas;
                         canvas.setBitmap(thumb);
                         // Copy the old bounds to restore them later
                         // If we were to do oldBounds = icon.getBounds(),
                         // the call to setBounds() that follows would
                         // change the same instance and we would lose the
                         // old bounds
                         mOldBounds.set(icon.getBounds());
                         final int x = (mIconWidth - width) / 2;
                         final int y = (mIconHeight - height) / 2;
                         icon.setBounds(x, y, x + width, y + height);
                         icon.draw(canvas);
                         icon.setBounds(mOldBounds);
                         //noinspection deprecation
                         icon = new BitmapDrawable(thumb);
                         ((BitmapDrawable) icon).setTargetDensity(mMetrics);
                         canvas.setBitmap(null);
                     } else if (iconWidth < width && iconHeight < height) {
                         final Bitmap.Config c = Bitmap.Config.ARGB_8888;
                         final Bitmap thumb = Bitmap.createBitmap(mIconWidth, mIconHeight, c);
                         final Canvas canvas = mCanvas;
                         canvas.setBitmap(thumb);
                         mOldBounds.set(icon.getBounds());
                         final int x = (width - iconWidth) / 2;
                         final int y = (height - iconHeight) / 2;
                         icon.setBounds(x, y, x + iconWidth, y + iconHeight);
                         icon.draw(canvas);
                         icon.setBounds(mOldBounds);
                         //noinspection deprecation
                         icon = new BitmapDrawable(thumb);
                         ((BitmapDrawable) icon).setTargetDensity(mMetrics);
                         canvas.setBitmap(null);
                     }
                 }

             } catch (Throwable t) {
                 icon = new EmptyDrawable(width, height);
             }

             return icon;
         }
     }

     private static class EmptyDrawable extends Drawable {
         private final int mWidth;
         private final int mHeight;

         EmptyDrawable(int width, int height) {
             mWidth = width;
             mHeight = height;
         }

         @Override
         public int getIntrinsicWidth() {
             return mWidth;
         }

         @Override
         public int getIntrinsicHeight() {
             return mHeight;
         }

         @Override
         public int getMinimumWidth() {
             return mWidth;
         }

         @Override
         public int getMinimumHeight() {
             return mHeight;
         }

         @Override
         public void draw(Canvas canvas) {
         }

         @Override
         public void setAlpha(int alpha) {
         }

         @Override
         public void setColorFilter(ColorFilter cf) {
         }

         @Override
         public int getOpacity() {
             return PixelFormat.TRANSLUCENT;
         }
     }
 }
	/*
	* Copyright (C) 2009 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.settings;

	import android.app.Activity;
	import android.content.Context;
	import android.content.DialogInterface;
	import android.content.Intent;
	import android.content.Intent.ShortcutIconResource;
	import android.content.pm.PackageManager;
	import android.content.pm.PackageManager.NameNotFoundException;
	import android.content.pm.ResolveInfo;
	import android.content.res.Resources;
	import android.graphics.Bitmap;
	import android.graphics.Canvas;
	import android.graphics.ColorFilter;
	import android.graphics.Paint;
	import android.graphics.PaintFlagsDrawFilter;
	import android.graphics.PixelFormat;
	import android.graphics.Rect;
	import android.graphics.drawable.BitmapDrawable;
	import android.graphics.drawable.Drawable;
	import android.graphics.drawable.PaintDrawable;
	import android.os.Bundle;
	import android.os.Parcelable;
	import android.util.DisplayMetrics;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.BaseAdapter;
	import android.widget.TextView;

	import com.android.internal.app.AlertActivity;
	import com.android.internal.app.AlertController;

	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.List;

	/**
	* Displays a list of all activities matching the incoming
	* {@link Intent#EXTRA_INTENT} query, along with any injected items.
	*/
	public class ActivityPicker extends AlertActivity implements
	DialogInterface.OnClickListener, DialogInterface.OnCancelListener {

	/**
	* Adapter of items that are displayed in this dialog.
	*/
	private PickAdapter mAdapter;

	/**
	* Base {@link Intent} used when building list.
	*/
	private Intent mBaseIntent;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	final Intent intent = getIntent();

	// Read base intent from extras, otherwise assume default
	Parcelable parcel = intent.getParcelableExtra(Intent.EXTRA_INTENT);
	if (parcel instanceof Intent) {
	mBaseIntent = (Intent) parcel;
	mBaseIntent.setFlags(mBaseIntent.getFlags() & ~(Intent.FLAG_GRANT_READ_URI_PERMISSION
	\| Intent.FLAG_GRANT_WRITE_URI_PERMISSION
	\| Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
	\| Intent.FLAG_GRANT_PREFIX_URI_PERMISSION));
	} else {
	mBaseIntent = new Intent(Intent.ACTION_MAIN, null);
	mBaseIntent.addCategory(Intent.CATEGORY_DEFAULT);
	}

	// Create dialog parameters
	AlertController.AlertParams params = mAlertParams;
	params.mOnClickListener = this;
	params.mOnCancelListener = this;

	// Use custom title if provided, otherwise default window title
	if (intent.hasExtra(Intent.EXTRA_TITLE)) {
	params.mTitle = intent.getStringExtra(Intent.EXTRA_TITLE);
	} else {
	params.mTitle = getTitle();
	}

	// Build list adapter of pickable items
	List<PickAdapter.Item> items = getItems();
	mAdapter = new PickAdapter(this, items);
	params.mAdapter = mAdapter;

	setupAlert();
	}

	/**
	* Handle clicking of dialog item by passing back
	* {@link #getIntentForPosition(int)} in {@link #setResult(int, Intent)}.
	*/
	public void onClick(DialogInterface dialog, int which) {
	Intent intent = getIntentForPosition(which);
	setResult(Activity.RESULT_OK, intent);
	finish();
	}

	/**
	* Handle canceled dialog by passing back {@link Activity#RESULT_CANCELED}.
	*/
	public void onCancel(DialogInterface dialog) {
	setResult(Activity.RESULT_CANCELED);
	finish();
	}

	/**
	* Build the specific {@link Intent} for a given list position. Convenience
	* method that calls through to {@link PickAdapter.Item#getIntent(Intent)}.
	*/
	protected Intent getIntentForPosition(int position) {
	PickAdapter.Item item = (PickAdapter.Item) mAdapter.getItem(position);
	return item.getIntent(mBaseIntent);
	}

	/**
	* Build and return list of items to be shown in dialog. Default
	* implementation mixes activities matching {@link #mBaseIntent} from
	* {@link #putIntentItems(Intent, List)} with any injected items from
	* {@link Intent#EXTRA_SHORTCUT_NAME}. Override this method in subclasses to
	* change the items shown.
	*/
	protected List<PickAdapter.Item> getItems() {
	PackageManager packageManager = getPackageManager();
	List<PickAdapter.Item> items = new ArrayList<PickAdapter.Item>();

	// Add any injected pick items
	final Intent intent = getIntent();
	ArrayList<String> labels =
	intent.getStringArrayListExtra(Intent.EXTRA_SHORTCUT_NAME);
	ArrayList<ShortcutIconResource> icons =
	intent.getParcelableArrayListExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE);

	if (labels != null && icons != null && labels.size() == icons.size()) {
	for (int i = 0; i < labels.size(); i++) {
	String label = labels.get(i);
	Drawable icon = null;

	try {
	// Try loading icon from requested package
	ShortcutIconResource iconResource = icons.get(i);
	Resources res = packageManager.getResourcesForApplication(
	iconResource.packageName);
	icon = res.getDrawable(res.getIdentifier(
	iconResource.resourceName, null, null), null);
	} catch (NameNotFoundException e) {
	// Ignore
	}

	items.add(new PickAdapter.Item(this, label, icon));
	}
	}

	// Add any intent items if base was given
	if (mBaseIntent != null) {
	putIntentItems(mBaseIntent, items);
	}

	return items;
	}

	/**
	* Fill the given list with any activities matching the base {@link Intent}.
	*/
	protected void putIntentItems(Intent baseIntent, List<PickAdapter.Item> items) {
	PackageManager packageManager = getPackageManager();
	List<ResolveInfo> list = packageManager.queryIntentActivities(baseIntent,
	0 /* no flags */);
	Collections.sort(list, new ResolveInfo.DisplayNameComparator(packageManager));

	final int listSize = list.size();
	for (int i = 0; i < listSize; i++) {
	ResolveInfo resolveInfo = list.get(i);
	items.add(new PickAdapter.Item(this, packageManager, resolveInfo));
	}
	}

	/**
	* Adapter which shows the set of activities that can be performed for a
	* given {@link Intent}.
	*/
	protected static class PickAdapter extends BaseAdapter {

	/**
	* Item that appears in a {@link PickAdapter} list.
	*/
	public static class Item implements AppWidgetLoader.LabelledItem {
	protected static IconResizer sResizer;

	protected IconResizer getResizer(Context context) {
	if (sResizer == null) {
	final Resources resources = context.getResources();
	int size = (int) resources.getDimension(android.R.dimen.app_icon_size);
	sResizer = new IconResizer(size, size, resources.getDisplayMetrics());
	}
	return sResizer;
	}

	CharSequence label;
	Drawable icon;
	String packageName;
	String className;
	Bundle extras;

	/**
	* Create a list item from given label and icon.
	*/
	Item(Context context, CharSequence label, Drawable icon) {
	this.label = label;
	this.icon = getResizer(context).createIconThumbnail(icon);
	}

	/**
	* Create a list item and fill it with details from the given
	* {@link ResolveInfo} object.
	*/
	Item(Context context, PackageManager pm, ResolveInfo resolveInfo) {
	label = resolveInfo.loadLabel(pm);
	if (label == null && resolveInfo.activityInfo != null) {
	label = resolveInfo.activityInfo.name;
	}

	icon = getResizer(context).createIconThumbnail(resolveInfo.loadIcon(pm));
	packageName = resolveInfo.activityInfo.applicationInfo.packageName;
	className = resolveInfo.activityInfo.name;
	}

	/**
	* Build the {@link Intent} described by this item. If this item
	* can't create a valid {@link android.content.ComponentName}, it will return
	* {@link Intent#ACTION_CREATE_SHORTCUT} filled with the item label.
	*/
	Intent getIntent(Intent baseIntent) {
	Intent intent = new Intent(baseIntent);
	if (packageName != null && className != null) {
	// Valid package and class, so fill details as normal intent
	intent.setClassName(packageName, className);
	if (extras != null) {
	intent.putExtras(extras);
	}
	} else {
	// No valid package or class, so treat as shortcut with label
	intent.setAction(Intent.ACTION_CREATE_SHORTCUT);
	intent.putExtra(Intent.EXTRA_SHORTCUT_NAME, label);
	}
	return intent;
	}

	public CharSequence getLabel() {
	return label;
	}
	}

	private final LayoutInflater mInflater;
	private final List<Item> mItems;

	/**
	* Create an adapter for the given items.
	*/
	public PickAdapter(Context context, List<Item> items) {
	mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	mItems = items;
	}

	/**
	* {@inheritDoc}
	*/
	public int getCount() {
	return mItems.size();
	}

	/**
	* {@inheritDoc}
	*/
	public Object getItem(int position) {
	return mItems.get(position);
	}

	/**
	* {@inheritDoc}
	*/
	public long getItemId(int position) {
	return position;
	}

	/**
	* {@inheritDoc}
	*/
	public View getView(int position, View convertView, ViewGroup parent) {
	if (convertView == null) {
	convertView = mInflater.inflate(R.layout.pick_item, parent, false);
	}

	Item item = (Item) getItem(position);
	TextView textView = (TextView) convertView;
	textView.setText(item.label);
	textView.setCompoundDrawablesWithIntrinsicBounds(item.icon, null, null, null);

	return convertView;
	}
	}

	/**
	* Utility class to resize icons to match default icon size. Code is mostly
	* borrowed from Launcher.
	*/
	private static class IconResizer {
	private final int mIconWidth;
	private final int mIconHeight;

	private final DisplayMetrics mMetrics;
	private final Rect mOldBounds = new Rect();
	private final Canvas mCanvas = new Canvas();

	public IconResizer(int width, int height, DisplayMetrics metrics) {
	mCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
	Paint.FILTER_BITMAP_FLAG));

	mMetrics = metrics;
	mIconWidth = width;
	mIconHeight = height;
	}

	/**
	* Returns a Drawable representing the thumbnail of the specified Drawable.
	* The size of the thumbnail is defined by the dimension
	* android.R.dimen.launcher_application_icon_size.
	*
	* This method is not thread-safe and should be invoked on the UI thread only.
	*
	* @param icon The icon to get a thumbnail of.
	*
	* @return A thumbnail for the specified icon or the icon itself if the
	* thumbnail could not be created.
	*/
	public Drawable createIconThumbnail(Drawable icon) {
	int width = mIconWidth;
	int height = mIconHeight;

	if (icon == null) {
	return new EmptyDrawable(width, height);
	}

	try {
	if (icon instanceof PaintDrawable) {
	PaintDrawable painter = (PaintDrawable) icon;
	painter.setIntrinsicWidth(width);
	painter.setIntrinsicHeight(height);
	} else if (icon instanceof BitmapDrawable) {
	// Ensure the bitmap has a density.
	BitmapDrawable bitmapDrawable = (BitmapDrawable) icon;
	Bitmap bitmap = bitmapDrawable.getBitmap();
	if (bitmap.getDensity() == Bitmap.DENSITY_NONE) {
	bitmapDrawable.setTargetDensity(mMetrics);
	}
	}
	int iconWidth = icon.getIntrinsicWidth();
	int iconHeight = icon.getIntrinsicHeight();

	if (iconWidth > 0 && iconHeight > 0) {
	if (width < iconWidth \|\| height < iconHeight) {
	final float ratio = (float) iconWidth / iconHeight;

	if (iconWidth > iconHeight) {
	height = (int) (width / ratio);
	} else if (iconHeight > iconWidth) {
	width = (int) (height * ratio);
	}

	final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ?
	Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
	final Bitmap thumb = Bitmap.createBitmap(mIconWidth, mIconHeight, c);
	final Canvas canvas = mCanvas;
	canvas.setBitmap(thumb);
	// Copy the old bounds to restore them later
	// If we were to do oldBounds = icon.getBounds(),
	// the call to setBounds() that follows would
	// change the same instance and we would lose the
	// old bounds
	mOldBounds.set(icon.getBounds());
	final int x = (mIconWidth - width) / 2;
	final int y = (mIconHeight - height) / 2;
	icon.setBounds(x, y, x + width, y + height);
	icon.draw(canvas);
	icon.setBounds(mOldBounds);
	//noinspection deprecation
	icon = new BitmapDrawable(thumb);
	((BitmapDrawable) icon).setTargetDensity(mMetrics);
	canvas.setBitmap(null);
	} else if (iconWidth < width && iconHeight < height) {
	final Bitmap.Config c = Bitmap.Config.ARGB_8888;
	final Bitmap thumb = Bitmap.createBitmap(mIconWidth, mIconHeight, c);
	final Canvas canvas = mCanvas;
	canvas.setBitmap(thumb);
	mOldBounds.set(icon.getBounds());
	final int x = (width - iconWidth) / 2;
	final int y = (height - iconHeight) / 2;
	icon.setBounds(x, y, x + iconWidth, y + iconHeight);
	icon.draw(canvas);
	icon.setBounds(mOldBounds);
	//noinspection deprecation
	icon = new BitmapDrawable(thumb);
	((BitmapDrawable) icon).setTargetDensity(mMetrics);
	canvas.setBitmap(null);
	}
	}

	} catch (Throwable t) {
	icon = new EmptyDrawable(width, height);
	}

	return icon;
	}
	}

	private static class EmptyDrawable extends Drawable {
	private final int mWidth;
	private final int mHeight;

	EmptyDrawable(int width, int height) {
	mWidth = width;
	mHeight = height;
	}

	@Override
	public int getIntrinsicWidth() {
	return mWidth;
	}

	@Override
	public int getIntrinsicHeight() {
	return mHeight;
	}

	@Override
	public int getMinimumWidth() {
	return mWidth;
	}

	@Override
	public int getMinimumHeight() {
	return mHeight;
	}

	@Override
	public void draw(Canvas canvas) {
	}

	@Override
	public void setAlpha(int alpha) {
	}

	@Override
	public void setColorFilter(ColorFilter cf) {
	}

	@Override
	public int getOpacity() {
	return PixelFormat.TRANSLUCENT;
	}
	}
	}