packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2011 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.systemui.recent;

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

 import android.animation.Animator;
 import android.animation.LayoutTransition;
 import android.app.ActivityManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Matrix;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.Shader.TileMode;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.RelativeLayout;
 import android.widget.TextView;

 import com.android.systemui.R;
 import com.android.systemui.statusbar.StatusBar;
 import com.android.systemui.statusbar.phone.PhoneStatusBar;
 import com.android.systemui.statusbar.tablet.StatusBarPanel;
 import com.android.systemui.statusbar.tablet.TabletStatusBar;

 public class RecentsPanelView extends RelativeLayout
         implements OnItemClickListener, RecentsCallback, StatusBarPanel, Animator.AnimatorListener {
     static final String TAG = "RecentsListView";
     static final boolean DEBUG = TabletStatusBar.DEBUG || PhoneStatusBar.DEBUG;
     private static final int DISPLAY_TASKS = 20;
     private static final int MAX_TASKS = DISPLAY_TASKS + 1; // allow extra for non-apps
     private StatusBar mBar;
     private ArrayList<ActivityDescription> mActivityDescriptions;
     private int mIconDpi;
     private View mRecentsScrim;
     private View mRecentsGlowView;
     private View mRecentsContainer;
     private Bitmap mGlowBitmap;
     // TODO: add these widgets attributes to the layout file
     private int mGlowBitmapPaddingLeftPx;
     private int mGlowBitmapPaddingTopPx;
     private int mGlowBitmapPaddingRightPx;
     private int mGlowBitmapPaddingBottomPx;
     private boolean mShowing;
     private Choreographer mChoreo;
     private View mRecentsDismissButton;
     private ActivityDescriptionAdapter mListAdapter;

     /* package */ final static class ActivityDescription {
         int taskId; // application task id for curating apps
         Bitmap thumbnail; // generated by Activity.onCreateThumbnail()
         Drawable icon; // application package icon
         String label; // application package label
         CharSequence description; // generated by Activity.onCreateDescription()
         Intent intent; // launch intent for application
         Matrix matrix; // arbitrary rotation matrix to correct orientation
         String packageName; // used to override animations (see onClick())
         int position; // position in list

         public ActivityDescription(Bitmap _thumbnail,
                 Drawable _icon, String _label, CharSequence _desc, Intent _intent,
                 int _id, int _pos, String _packageName)
         {
             thumbnail = _thumbnail;
             icon = _icon;
             label = _label;
             description = _desc;
             intent = _intent;
             taskId = _id;
             position = _pos;
             packageName = _packageName;
         }
     };

     /* package */ final static class ViewHolder {
         ImageView thumbnailView;
         ImageView iconView;
         TextView labelView;
         TextView descriptionView;
         ActivityDescription activityDescription;
     }

     /* package */ final class ActivityDescriptionAdapter extends BaseAdapter {
         private LayoutInflater mInflater;

         public ActivityDescriptionAdapter(Context context) {
             mInflater = LayoutInflater.from(context);
         }

         public int getCount() {
             return mActivityDescriptions != null ? mActivityDescriptions.size() : 0;
         }

         public Object getItem(int position) {
             return position; // we only need the index
         }

         public long getItemId(int position) {
             return position; // we just need something unique for this position
         }

         public View getView(int position, View convertView, ViewGroup parent) {
             ViewHolder holder;
             if (convertView == null) {
                 convertView = mInflater.inflate(R.layout.status_bar_recent_item, null);
                 holder = new ViewHolder();
                 holder.thumbnailView = (ImageView) convertView.findViewById(R.id.app_thumbnail);
                 holder.iconView = (ImageView) convertView.findViewById(R.id.app_icon);
                 holder.labelView = (TextView) convertView.findViewById(R.id.app_label);
                 holder.descriptionView = (TextView) convertView.findViewById(R.id.app_description);
                 convertView.setTag(holder);
             } else {
                 holder = (ViewHolder) convertView.getTag();
             }

             // activityId is reverse since most recent appears at the bottom...
             final int activityId = mActivityDescriptions.size() - position - 1;

             final ActivityDescription activityDescription = mActivityDescriptions.get(activityId);
             final Bitmap thumb = activityDescription.thumbnail;
             holder.thumbnailView.setImageBitmap(compositeBitmap(mGlowBitmap, thumb));
             holder.iconView.setImageDrawable(activityDescription.icon);
             holder.labelView.setText(activityDescription.label);
             holder.descriptionView.setText(activityDescription.description);
             holder.thumbnailView.setTag(activityDescription);
             holder.activityDescription = activityDescription;

             return convertView;
         }
     }

     public boolean isInContentArea(int x, int y) {
         // use mRecentsContainer's exact bounds to determine horizontal position
         final int l = mRecentsContainer.getLeft();
         final int r = mRecentsContainer.getRight();
         // use surrounding mRecentsGlowView's position in parent determine vertical bounds
         final int t = mRecentsGlowView.getTop();
         final int b = mRecentsGlowView.getBottom();
         return x >= l && x < r && y >= t && y < b;
     }

     public void show(boolean show, boolean animate) {
         if (animate) {
             if (mShowing != show) {
                 mShowing = show;
                 if (show) {
                     setVisibility(View.VISIBLE);
                 }
                 mChoreo.startAnimation(show);
             }
         } else {
             mShowing = show;
             setVisibility(show ? View.VISIBLE : View.GONE);
             mChoreo.jumpTo(show);
         }
     }

     public void onAnimationCancel(Animator animation) {
     }

     public void onAnimationEnd(Animator animation) {
         if (mShowing) {
             final LayoutTransition transitioner = new LayoutTransition();
             ((ViewGroup)mRecentsContainer).setLayoutTransition(transitioner);
             createCustomAnimations(transitioner);
         } else {
             ((ViewGroup)mRecentsContainer).setLayoutTransition(null);
         }
     }

     public void onAnimationRepeat(Animator animation) {
     }

     public void onAnimationStart(Animator animation) {
     }


     /**
      * We need to be aligned at the bottom.  LinearLayout can't do this, so instead,
      * let LinearLayout do all the hard work, and then shift everything down to the bottom.
      */
     @Override
     protected void onLayout(boolean changed, int l, int t, int r, int b) {
         super.onLayout(changed, l, t, r, b);
         mChoreo.setPanelHeight(mRecentsContainer.getHeight());
     }

     /**
      * Whether the panel is showing, or, if it's animating, whether it will be
      * when the animation is done.
      */
     public boolean isShowing() {
         return mShowing;
     }

     public void setBar(StatusBar bar) {
         mBar = bar;
     }

     public RecentsPanelView(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
     }

     public RecentsPanelView(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);

         Resources res = context.getResources();
         boolean xlarge = (res.getConfiguration().screenLayout
                 & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE;

         mIconDpi = xlarge ? DisplayMetrics.DENSITY_HIGH : res.getDisplayMetrics().densityDpi;

         mGlowBitmap = BitmapFactory.decodeResource(res, R.drawable.recents_thumbnail_bg);
         mGlowBitmapPaddingLeftPx =
                 res.getDimensionPixelSize(R.dimen.recents_thumbnail_bg_padding_left);
         mGlowBitmapPaddingTopPx =
                 res.getDimensionPixelSize(R.dimen.recents_thumbnail_bg_padding_top);
         mGlowBitmapPaddingRightPx =
                 res.getDimensionPixelSize(R.dimen.recents_thumbnail_bg_padding_right);
         mGlowBitmapPaddingBottomPx =
                 res.getDimensionPixelSize(R.dimen.recents_thumbnail_bg_padding_bottom);
     }

     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();
         mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         mRecentsContainer = findViewById(R.id.recents_container);
         mListAdapter = new ActivityDescriptionAdapter(mContext);
         if (mRecentsContainer instanceof RecentsListView) {
             RecentsListView listView = (RecentsListView) mRecentsContainer;
             listView.setAdapter(mListAdapter);
             listView.setOnItemClickListener(this);
             listView.setCallback(this);
         } else if (mRecentsContainer instanceof RecentsHorizontalScrollView){
             RecentsHorizontalScrollView scrollView
                     = (RecentsHorizontalScrollView) mRecentsContainer;
             scrollView.setAdapter(mListAdapter);
             scrollView.setCallback(this);
         } else if (mRecentsContainer instanceof RecentsVerticalScrollView){
             RecentsVerticalScrollView scrollView
                     = (RecentsVerticalScrollView) mRecentsContainer;
             scrollView.setAdapter(mListAdapter);
             scrollView.setCallback(this);
         }
         else {
             throw new IllegalArgumentException("missing RecentsListView/RecentsScrollView");
         }


         mRecentsGlowView = findViewById(R.id.recents_glow);
         mRecentsScrim = (View) findViewById(R.id.recents_bg_protect);
         mChoreo = new Choreographer(this, mRecentsScrim, mRecentsGlowView, this);
         mRecentsDismissButton = findViewById(R.id.recents_dismiss_button);
         mRecentsDismissButton.setOnClickListener(new OnClickListener() {
             public void onClick(View v) {
                 hide(true);
             }
         });

         // In order to save space, we make the background texture repeat in the Y direction
         if (mRecentsScrim != null && mRecentsScrim.getBackground() instanceof BitmapDrawable) {
             ((BitmapDrawable) mRecentsScrim.getBackground()).setTileModeY(TileMode.REPEAT);
         }
     }

     private void createCustomAnimations(LayoutTransition transitioner) {
         transitioner.setDuration(LayoutTransition.DISAPPEARING, 250);
     }

     @Override
     protected void onVisibilityChanged(View changedView, int visibility) {
         super.onVisibilityChanged(changedView, visibility);
         if (DEBUG) Log.v(TAG, "onVisibilityChanged(" + changedView + ", " + visibility + ")");
         if (visibility == View.VISIBLE && changedView == this) {
             refreshApplicationList();
         }
     }

     private Drawable getFullResDefaultActivityIcon() {
         return getFullResIcon(Resources.getSystem(),
                 com.android.internal.R.mipmap.sym_def_app_icon);
     }

     private Drawable getFullResIcon(Resources resources, int iconId) {
         try {
             return resources.getDrawableForDensity(iconId, mIconDpi);
         } catch (Resources.NotFoundException e) {
             return getFullResDefaultActivityIcon();
         }
     }

     private Drawable getFullResIcon(ResolveInfo info, PackageManager packageManager) {
         Resources resources;
         try {
             resources = packageManager.getResourcesForApplication(
                     info.activityInfo.applicationInfo);
         } catch (PackageManager.NameNotFoundException e) {
             resources = null;
         }
         if (resources != null) {
             int iconId = info.activityInfo.getIconResource();
             if (iconId != 0) {
                 return getFullResIcon(resources, iconId);
             }
         }
         return getFullResDefaultActivityIcon();
     }

     private ArrayList<ActivityDescription> getRecentTasks() {
         ArrayList<ActivityDescription> activityDescriptions = new ArrayList<ActivityDescription>();
         final PackageManager pm = mContext.getPackageManager();
         final ActivityManager am = (ActivityManager)
                 mContext.getSystemService(Context.ACTIVITY_SERVICE);

         final List<ActivityManager.RecentTaskInfo> recentTasks =
                 am.getRecentTasks(MAX_TASKS, ActivityManager.RECENT_IGNORE_UNAVAILABLE);

         ActivityInfo homeInfo = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME)
                     .resolveActivityInfo(pm, 0);

         int numTasks = recentTasks.size();

         // skip the first activity - assume it's either the home screen or the current app.
         final int first = 1;
         for (int i = first, index = 0; i < numTasks && (index < MAX_TASKS); ++i) {
             final ActivityManager.RecentTaskInfo recentInfo = recentTasks.get(i);

             Intent intent = new Intent(recentInfo.baseIntent);
             if (recentInfo.origActivity != null) {
                 intent.setComponent(recentInfo.origActivity);
             }

             // Skip the current home activity.
             if (homeInfo != null
                     && homeInfo.packageName.equals(intent.getComponent().getPackageName())
                     && homeInfo.name.equals(intent.getComponent().getClassName())) {
                 continue;
             }

             intent.setFlags((intent.getFlags()&~Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
                     | Intent.FLAG_ACTIVITY_NEW_TASK);
             final ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
             if (resolveInfo != null) {
                 final ActivityInfo info = resolveInfo.activityInfo;
                 final String title = info.loadLabel(pm).toString();
                 // Drawable icon = info.loadIcon(pm);
                 Drawable icon = getFullResIcon(resolveInfo, pm);
                 int id = recentTasks.get(i).id;
                 if (title != null && title.length() > 0 && icon != null) {
                     if (DEBUG) Log.v(TAG, "creating activity desc for id=" + id + ", label=" + title);
                     ActivityManager.TaskThumbnails thumbs = am.getTaskThumbnails(
                             recentInfo.persistentId);
                     ActivityDescription item = new ActivityDescription(
                             thumbs != null ? thumbs.mainThumbnail : null,
                             icon, title, recentInfo.description, intent, id,
                             index, info.packageName);
                     activityDescriptions.add(item);
                     ++index;
                 } else {
                     if (DEBUG) Log.v(TAG, "SKIPPING item " + id);
                 }
             }
         }
         return activityDescriptions;
     }

     ActivityDescription findActivityDescription(int id)
     {
         ActivityDescription desc = null;
         for (int i = 0; i < mActivityDescriptions.size(); i++) {
             ActivityDescription item = mActivityDescriptions.get(i);
             if (item != null && item.taskId == id) {
                 desc = item;
                 break;
             }
         }
         return desc;
     }

     private void refreshApplicationList() {
         mActivityDescriptions = getRecentTasks();
         mListAdapter.notifyDataSetInvalidated();
         if (mActivityDescriptions.size() > 0) {
             if (DEBUG) Log.v(TAG, "Showing " + mActivityDescriptions.size() + " apps");
             updateUiElements(getResources().getConfiguration());
         } else {
             // Immediately hide this panel
             if (DEBUG) Log.v(TAG, "Nothing to show");
             hide(false);
         }
     }

     private Bitmap compositeBitmap(Bitmap background, Bitmap thumbnail) {
         Bitmap outBitmap = background.copy(background.getConfig(), true);
         if (thumbnail != null) {
             Canvas canvas = new Canvas(outBitmap);
             Paint paint = new Paint();
             paint.setAntiAlias(true);
             paint.setFilterBitmap(true);
             paint.setAlpha(255);
             final int srcWidth = thumbnail.getWidth();
             final int srcHeight = thumbnail.getHeight();
             if (DEBUG) Log.v(TAG, "Source thumb: " + srcWidth + "x" + srcHeight);
             canvas.drawBitmap(thumbnail,
                     new Rect(0, 0, srcWidth-1, srcHeight-1),
                     new RectF(mGlowBitmapPaddingLeftPx, mGlowBitmapPaddingTopPx,
                             outBitmap.getWidth() - mGlowBitmapPaddingRightPx,
                             outBitmap.getHeight() - mGlowBitmapPaddingBottomPx), paint);
         }
         return outBitmap;
     }

     private void updateUiElements(Configuration config) {
         final int items = mActivityDescriptions.size();

         mRecentsContainer.setVisibility(items > 0 ? View.VISIBLE : View.GONE);
         mRecentsGlowView.setVisibility(items > 0 ? View.VISIBLE : View.GONE);
     }

     public void hide(boolean animate) {
         if (!animate) {
             setVisibility(View.GONE);
         }
         if (mBar != null) {
             mBar.animateCollapse();
         }
     }

     public void handleOnClick(View view) {
         ActivityDescription ad = ((ViewHolder) view.getTag()).activityDescription;
         final Context context = view.getContext();
         final ActivityManager am = (ActivityManager)
                 context.getSystemService(Context.ACTIVITY_SERVICE);
         if (ad.taskId >= 0) {
             // This is an active task; it should just go to the foreground.
             am.moveTaskToFront(ad.taskId, ActivityManager.MOVE_TASK_WITH_HOME);
         } else {
             Intent intent = ad.intent;
             intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY
                     | Intent.FLAG_ACTIVITY_TASK_ON_HOME);
             if (DEBUG) Log.v(TAG, "Starting activity " + intent);
             context.startActivity(intent);
         }
         hide(true);
     }

     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
         handleOnClick(view);
     }

     public void handleSwipe(View view, int direction) {
         ActivityDescription ad = ((ViewHolder) view.getTag()).activityDescription;
         if (DEBUG) Log.v(TAG, "Jettison " + ad.label);
         mActivityDescriptions.remove(ad);

         // Handled by widget containers to enable LayoutTransitions properly
         // mListAdapter.notifyDataSetChanged();

         if (mActivityDescriptions.size() == 0) {
             hide(false);
         }

         // Currently, either direction means the same thing, so ignore direction and remove
         // the task.
         final ActivityManager am = (ActivityManager)
                 mContext.getSystemService(Context.ACTIVITY_SERVICE);
         am.removeTask(ad.taskId, ActivityManager.REMOVE_TASK_KILL_PROCESS);
     }

     public void handleLongPress(View selectedView) {
         // TODO show context menu : "Remove from list", "Show properties"
     }
 }
	/*
	* Copyright (C) 2011 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.systemui.recent;

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

	import android.animation.Animator;
	import android.animation.LayoutTransition;
	import android.app.ActivityManager;
	import android.content.Context;
	import android.content.Intent;
	import android.content.pm.ActivityInfo;
	import android.content.pm.PackageManager;
	import android.content.pm.ResolveInfo;
	import android.content.res.Configuration;
	import android.content.res.Resources;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.graphics.Canvas;
	import android.graphics.Matrix;
	import android.graphics.Paint;
	import android.graphics.Rect;
	import android.graphics.RectF;
	import android.graphics.Shader.TileMode;
	import android.graphics.drawable.BitmapDrawable;
	import android.graphics.drawable.Drawable;
	import android.util.AttributeSet;
	import android.util.DisplayMetrics;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.AdapterView;
	import android.widget.AdapterView.OnItemClickListener;
	import android.widget.BaseAdapter;
	import android.widget.ImageView;
	import android.widget.RelativeLayout;
	import android.widget.TextView;

	import com.android.systemui.R;
	import com.android.systemui.statusbar.StatusBar;
	import com.android.systemui.statusbar.phone.PhoneStatusBar;
	import com.android.systemui.statusbar.tablet.StatusBarPanel;
	import com.android.systemui.statusbar.tablet.TabletStatusBar;

	public class RecentsPanelView extends RelativeLayout
	implements OnItemClickListener, RecentsCallback, StatusBarPanel, Animator.AnimatorListener {
	static final String TAG = "RecentsListView";
	static final boolean DEBUG = TabletStatusBar.DEBUG \|\| PhoneStatusBar.DEBUG;
	private static final int DISPLAY_TASKS = 20;
	private static final int MAX_TASKS = DISPLAY_TASKS + 1; // allow extra for non-apps
	private StatusBar mBar;
	private ArrayList<ActivityDescription> mActivityDescriptions;
	private int mIconDpi;
	private View mRecentsScrim;
	private View mRecentsGlowView;
	private View mRecentsContainer;
	private Bitmap mGlowBitmap;
	// TODO: add these widgets attributes to the layout file
	private int mGlowBitmapPaddingLeftPx;
	private int mGlowBitmapPaddingTopPx;
	private int mGlowBitmapPaddingRightPx;
	private int mGlowBitmapPaddingBottomPx;
	private boolean mShowing;
	private Choreographer mChoreo;
	private View mRecentsDismissButton;
	private ActivityDescriptionAdapter mListAdapter;

	/* package */ final static class ActivityDescription {
	int taskId; // application task id for curating apps
	Bitmap thumbnail; // generated by Activity.onCreateThumbnail()
	Drawable icon; // application package icon
	String label; // application package label
	CharSequence description; // generated by Activity.onCreateDescription()
	Intent intent; // launch intent for application
	Matrix matrix; // arbitrary rotation matrix to correct orientation
	String packageName; // used to override animations (see onClick())
	int position; // position in list

	public ActivityDescription(Bitmap _thumbnail,
	Drawable _icon, String _label, CharSequence _desc, Intent _intent,
	int _id, int _pos, String _packageName)
	{
	thumbnail = _thumbnail;
	icon = _icon;
	label = _label;
	description = _desc;
	intent = _intent;
	taskId = _id;
	position = _pos;
	packageName = _packageName;
	}
	};

	/* package */ final static class ViewHolder {
	ImageView thumbnailView;
	ImageView iconView;
	TextView labelView;
	TextView descriptionView;
	ActivityDescription activityDescription;
	}

	/* package */ final class ActivityDescriptionAdapter extends BaseAdapter {
	private LayoutInflater mInflater;

	public ActivityDescriptionAdapter(Context context) {
	mInflater = LayoutInflater.from(context);
	}

	public int getCount() {
	return mActivityDescriptions != null ? mActivityDescriptions.size() : 0;
	}

	public Object getItem(int position) {
	return position; // we only need the index
	}

	public long getItemId(int position) {
	return position; // we just need something unique for this position
	}

	public View getView(int position, View convertView, ViewGroup parent) {
	ViewHolder holder;
	if (convertView == null) {
	convertView = mInflater.inflate(R.layout.status_bar_recent_item, null);
	holder = new ViewHolder();
	holder.thumbnailView = (ImageView) convertView.findViewById(R.id.app_thumbnail);
	holder.iconView = (ImageView) convertView.findViewById(R.id.app_icon);
	holder.labelView = (TextView) convertView.findViewById(R.id.app_label);
	holder.descriptionView = (TextView) convertView.findViewById(R.id.app_description);
	convertView.setTag(holder);
	} else {
	holder = (ViewHolder) convertView.getTag();
	}

	// activityId is reverse since most recent appears at the bottom...
	final int activityId = mActivityDescriptions.size() - position - 1;

	final ActivityDescription activityDescription = mActivityDescriptions.get(activityId);
	final Bitmap thumb = activityDescription.thumbnail;
	holder.thumbnailView.setImageBitmap(compositeBitmap(mGlowBitmap, thumb));
	holder.iconView.setImageDrawable(activityDescription.icon);
	holder.labelView.setText(activityDescription.label);
	holder.descriptionView.setText(activityDescription.description);
	holder.thumbnailView.setTag(activityDescription);
	holder.activityDescription = activityDescription;

	return convertView;
	}
	}

	public boolean isInContentArea(int x, int y) {
	// use mRecentsContainer's exact bounds to determine horizontal position
	final int l = mRecentsContainer.getLeft();
	final int r = mRecentsContainer.getRight();
	// use surrounding mRecentsGlowView's position in parent determine vertical bounds
	final int t = mRecentsGlowView.getTop();
	final int b = mRecentsGlowView.getBottom();
	return x >= l && x < r && y >= t && y < b;
	}

	public void show(boolean show, boolean animate) {
	if (animate) {
	if (mShowing != show) {
	mShowing = show;
	if (show) {
	setVisibility(View.VISIBLE);
	}
	mChoreo.startAnimation(show);
	}
	} else {
	mShowing = show;
	setVisibility(show ? View.VISIBLE : View.GONE);
	mChoreo.jumpTo(show);
	}
	}

	public void onAnimationCancel(Animator animation) {
	}

	public void onAnimationEnd(Animator animation) {
	if (mShowing) {
	final LayoutTransition transitioner = new LayoutTransition();
	((ViewGroup)mRecentsContainer).setLayoutTransition(transitioner);
	createCustomAnimations(transitioner);
	} else {
	((ViewGroup)mRecentsContainer).setLayoutTransition(null);
	}
	}

	public void onAnimationRepeat(Animator animation) {
	}

	public void onAnimationStart(Animator animation) {
	}


	/**
	* We need to be aligned at the bottom. LinearLayout can't do this, so instead,
	* let LinearLayout do all the hard work, and then shift everything down to the bottom.
	*/
	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
	super.onLayout(changed, l, t, r, b);
	mChoreo.setPanelHeight(mRecentsContainer.getHeight());
	}

	/**
	* Whether the panel is showing, or, if it's animating, whether it will be
	* when the animation is done.
	*/
	public boolean isShowing() {
	return mShowing;
	}

	public void setBar(StatusBar bar) {
	mBar = bar;
	}

	public RecentsPanelView(Context context, AttributeSet attrs) {
	this(context, attrs, 0);
	}

	public RecentsPanelView(Context context, AttributeSet attrs, int defStyle) {
	super(context, attrs, defStyle);

	Resources res = context.getResources();
	boolean xlarge = (res.getConfiguration().screenLayout
	& Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE;

	mIconDpi = xlarge ? DisplayMetrics.DENSITY_HIGH : res.getDisplayMetrics().densityDpi;

	mGlowBitmap = BitmapFactory.decodeResource(res, R.drawable.recents_thumbnail_bg);
	mGlowBitmapPaddingLeftPx =
	res.getDimensionPixelSize(R.dimen.recents_thumbnail_bg_padding_left);
	mGlowBitmapPaddingTopPx =
	res.getDimensionPixelSize(R.dimen.recents_thumbnail_bg_padding_top);
	mGlowBitmapPaddingRightPx =
	res.getDimensionPixelSize(R.dimen.recents_thumbnail_bg_padding_right);
	mGlowBitmapPaddingBottomPx =
	res.getDimensionPixelSize(R.dimen.recents_thumbnail_bg_padding_bottom);
	}

	@Override
	protected void onFinishInflate() {
	super.onFinishInflate();
	mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	mRecentsContainer = findViewById(R.id.recents_container);
	mListAdapter = new ActivityDescriptionAdapter(mContext);
	if (mRecentsContainer instanceof RecentsListView) {
	RecentsListView listView = (RecentsListView) mRecentsContainer;
	listView.setAdapter(mListAdapter);
	listView.setOnItemClickListener(this);
	listView.setCallback(this);
	} else if (mRecentsContainer instanceof RecentsHorizontalScrollView){
	RecentsHorizontalScrollView scrollView
	= (RecentsHorizontalScrollView) mRecentsContainer;
	scrollView.setAdapter(mListAdapter);
	scrollView.setCallback(this);
	} else if (mRecentsContainer instanceof RecentsVerticalScrollView){
	RecentsVerticalScrollView scrollView
	= (RecentsVerticalScrollView) mRecentsContainer;
	scrollView.setAdapter(mListAdapter);
	scrollView.setCallback(this);
	}
	else {
	throw new IllegalArgumentException("missing RecentsListView/RecentsScrollView");
	}


	mRecentsGlowView = findViewById(R.id.recents_glow);
	mRecentsScrim = (View) findViewById(R.id.recents_bg_protect);
	mChoreo = new Choreographer(this, mRecentsScrim, mRecentsGlowView, this);
	mRecentsDismissButton = findViewById(R.id.recents_dismiss_button);
	mRecentsDismissButton.setOnClickListener(new OnClickListener() {
	public void onClick(View v) {
	hide(true);
	}
	});

	// In order to save space, we make the background texture repeat in the Y direction
	if (mRecentsScrim != null && mRecentsScrim.getBackground() instanceof BitmapDrawable) {
	((BitmapDrawable) mRecentsScrim.getBackground()).setTileModeY(TileMode.REPEAT);
	}
	}

	private void createCustomAnimations(LayoutTransition transitioner) {
	transitioner.setDuration(LayoutTransition.DISAPPEARING, 250);
	}

	@Override
	protected void onVisibilityChanged(View changedView, int visibility) {
	super.onVisibilityChanged(changedView, visibility);
	if (DEBUG) Log.v(TAG, "onVisibilityChanged(" + changedView + ", " + visibility + ")");
	if (visibility == View.VISIBLE && changedView == this) {
	refreshApplicationList();
	}
	}

	private Drawable getFullResDefaultActivityIcon() {
	return getFullResIcon(Resources.getSystem(),
	com.android.internal.R.mipmap.sym_def_app_icon);
	}

	private Drawable getFullResIcon(Resources resources, int iconId) {
	try {
	return resources.getDrawableForDensity(iconId, mIconDpi);
	} catch (Resources.NotFoundException e) {
	return getFullResDefaultActivityIcon();
	}
	}

	private Drawable getFullResIcon(ResolveInfo info, PackageManager packageManager) {
	Resources resources;
	try {
	resources = packageManager.getResourcesForApplication(
	info.activityInfo.applicationInfo);
	} catch (PackageManager.NameNotFoundException e) {
	resources = null;
	}
	if (resources != null) {
	int iconId = info.activityInfo.getIconResource();
	if (iconId != 0) {
	return getFullResIcon(resources, iconId);
	}
	}
	return getFullResDefaultActivityIcon();
	}

	private ArrayList<ActivityDescription> getRecentTasks() {
	ArrayList<ActivityDescription> activityDescriptions = new ArrayList<ActivityDescription>();
	final PackageManager pm = mContext.getPackageManager();
	final ActivityManager am = (ActivityManager)
	mContext.getSystemService(Context.ACTIVITY_SERVICE);

	final List<ActivityManager.RecentTaskInfo> recentTasks =
	am.getRecentTasks(MAX_TASKS, ActivityManager.RECENT_IGNORE_UNAVAILABLE);

	ActivityInfo homeInfo = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME)
	.resolveActivityInfo(pm, 0);

	int numTasks = recentTasks.size();

	// skip the first activity - assume it's either the home screen or the current app.
	final int first = 1;
	for (int i = first, index = 0; i < numTasks && (index < MAX_TASKS); ++i) {
	final ActivityManager.RecentTaskInfo recentInfo = recentTasks.get(i);

	Intent intent = new Intent(recentInfo.baseIntent);
	if (recentInfo.origActivity != null) {
	intent.setComponent(recentInfo.origActivity);
	}

	// Skip the current home activity.
	if (homeInfo != null
	&& homeInfo.packageName.equals(intent.getComponent().getPackageName())
	&& homeInfo.name.equals(intent.getComponent().getClassName())) {
	continue;
	}

	intent.setFlags((intent.getFlags()&~Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
	\| Intent.FLAG_ACTIVITY_NEW_TASK);
	final ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
	if (resolveInfo != null) {
	final ActivityInfo info = resolveInfo.activityInfo;
	final String title = info.loadLabel(pm).toString();
	// Drawable icon = info.loadIcon(pm);
	Drawable icon = getFullResIcon(resolveInfo, pm);
	int id = recentTasks.get(i).id;
	if (title != null && title.length() > 0 && icon != null) {
	if (DEBUG) Log.v(TAG, "creating activity desc for id=" + id + ", label=" + title);
	ActivityManager.TaskThumbnails thumbs = am.getTaskThumbnails(
	recentInfo.persistentId);
	ActivityDescription item = new ActivityDescription(
	thumbs != null ? thumbs.mainThumbnail : null,
	icon, title, recentInfo.description, intent, id,
	index, info.packageName);
	activityDescriptions.add(item);
	++index;
	} else {
	if (DEBUG) Log.v(TAG, "SKIPPING item " + id);
	}
	}
	}
	return activityDescriptions;
	}

	ActivityDescription findActivityDescription(int id)
	{
	ActivityDescription desc = null;
	for (int i = 0; i < mActivityDescriptions.size(); i++) {
	ActivityDescription item = mActivityDescriptions.get(i);
	if (item != null && item.taskId == id) {
	desc = item;
	break;
	}
	}
	return desc;
	}

	private void refreshApplicationList() {
	mActivityDescriptions = getRecentTasks();
	mListAdapter.notifyDataSetInvalidated();
	if (mActivityDescriptions.size() > 0) {
	if (DEBUG) Log.v(TAG, "Showing " + mActivityDescriptions.size() + " apps");
	updateUiElements(getResources().getConfiguration());
	} else {
	// Immediately hide this panel
	if (DEBUG) Log.v(TAG, "Nothing to show");
	hide(false);
	}
	}

	private Bitmap compositeBitmap(Bitmap background, Bitmap thumbnail) {
	Bitmap outBitmap = background.copy(background.getConfig(), true);
	if (thumbnail != null) {
	Canvas canvas = new Canvas(outBitmap);
	Paint paint = new Paint();
	paint.setAntiAlias(true);
	paint.setFilterBitmap(true);
	paint.setAlpha(255);
	final int srcWidth = thumbnail.getWidth();
	final int srcHeight = thumbnail.getHeight();
	if (DEBUG) Log.v(TAG, "Source thumb: " + srcWidth + "x" + srcHeight);
	canvas.drawBitmap(thumbnail,
	new Rect(0, 0, srcWidth-1, srcHeight-1),
	new RectF(mGlowBitmapPaddingLeftPx, mGlowBitmapPaddingTopPx,
	outBitmap.getWidth() - mGlowBitmapPaddingRightPx,
	outBitmap.getHeight() - mGlowBitmapPaddingBottomPx), paint);
	}
	return outBitmap;
	}

	private void updateUiElements(Configuration config) {
	final int items = mActivityDescriptions.size();

	mRecentsContainer.setVisibility(items > 0 ? View.VISIBLE : View.GONE);
	mRecentsGlowView.setVisibility(items > 0 ? View.VISIBLE : View.GONE);
	}

	public void hide(boolean animate) {
	if (!animate) {
	setVisibility(View.GONE);
	}
	if (mBar != null) {
	mBar.animateCollapse();
	}
	}

	public void handleOnClick(View view) {
	ActivityDescription ad = ((ViewHolder) view.getTag()).activityDescription;
	final Context context = view.getContext();
	final ActivityManager am = (ActivityManager)
	context.getSystemService(Context.ACTIVITY_SERVICE);
	if (ad.taskId >= 0) {
	// This is an active task; it should just go to the foreground.
	am.moveTaskToFront(ad.taskId, ActivityManager.MOVE_TASK_WITH_HOME);
	} else {
	Intent intent = ad.intent;
	intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY
	\| Intent.FLAG_ACTIVITY_TASK_ON_HOME);
	if (DEBUG) Log.v(TAG, "Starting activity " + intent);
	context.startActivity(intent);
	}
	hide(true);
	}

	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
	handleOnClick(view);
	}

	public void handleSwipe(View view, int direction) {
	ActivityDescription ad = ((ViewHolder) view.getTag()).activityDescription;
	if (DEBUG) Log.v(TAG, "Jettison " + ad.label);
	mActivityDescriptions.remove(ad);

	// Handled by widget containers to enable LayoutTransitions properly
	// mListAdapter.notifyDataSetChanged();

	if (mActivityDescriptions.size() == 0) {
	hide(false);
	}

	// Currently, either direction means the same thing, so ignore direction and remove
	// the task.
	final ActivityManager am = (ActivityManager)
	mContext.getSystemService(Context.ACTIVITY_SERVICE);
	am.removeTask(ad.taskId, ActivityManager.REMOVE_TASK_KILL_PROCESS);
	}

	public void handleLongPress(View selectedView) {
	// TODO show context menu : "Remove from list", "Show properties"
	}
	}