Load PackageItemInfo in background thread to prevent ANR

- Decoupled widget model from widget view, and placed the
creation to LauncherModel.
- As a result packagemanager operation, iconcache retrieval is all done inside
LauncherModel on background thread
b/21311085
b/21325319

Change-Id: I294698527db58b89f3da558090a367530c058776

src/com/android/launcher3/model/WidgetsModel.java

@@ -0,0 +1,125 @@
+
+package com.android.launcher3.model;
+
+import android.content.Context;
+import android.content.pm.ResolveInfo;
+import android.os.Handler;
+import android.os.Process;
+import android.util.Log;
+
+import com.android.launcher3.IconCache;
+import com.android.launcher3.LauncherAppState;
+import com.android.launcher3.LauncherAppWidgetProviderInfo;
+
+import com.android.launcher3.LauncherModel;
+import com.android.launcher3.Utilities;
+import com.android.launcher3.compat.UserHandleCompat;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Widgets data model that is used by the adapters of the widget views and controllers.
+ *
+ * <p> The widgets and shortcuts are organized using package name as its index.
+ */
+public class WidgetsModel {
+
+    private static final String TAG = "WidgetsModel";
+    private static final boolean DEBUG = false;
+
+    /* List of packages that is tracked by this model. */
+    private List<PackageItemInfo> mPackageItemInfos = new ArrayList<>();
+
+    /* Map of widgets and shortcuts that are tracked per package. */
+    private Map<PackageItemInfo, ArrayList<Object>> mWidgetsList = new HashMap<>();
+
+    private ArrayList<Object> mRawList;
+
+    private final Comparator mWidgetAndShortcutNameComparator;
+    private final Comparator mAppNameComparator;
+
+    private final IconCache mIconCache;
+    private final Handler mWorkerHandler;
+
+    public WidgetsModel(Context context) {
+        mWidgetAndShortcutNameComparator = new WidgetsAndShortcutNameComparator(context);
+        mAppNameComparator = (new AppNameComparator(context)).getAppInfoComparator();
+        mIconCache = LauncherAppState.getInstance().getIconCache();
+        mWorkerHandler = new Handler(LauncherModel.getWorkerLooper());
+    }
+
+    // Access methods that may be deleted if the private fields are made package-private.
+    public int getPackageSize() {
+        return mPackageItemInfos.size();
+    }
+
+    // Access methods that may be deleted if the private fields are made package-private.
+    public PackageItemInfo getPackageItemInfo(int pos) {
+        return mPackageItemInfos.get(pos);
+    }
+
+    public List<Object> getSortedWidgets(int pos) {
+        return mWidgetsList.get(mPackageItemInfos.get(pos));
+    }
+
+    public ArrayList<Object> getRawList() {
+        return mRawList;
+    }
+
+    public void addWidgetsAndShortcuts(ArrayList<Object> rawWidgetsShortcuts) {
+        Utilities.assertWorkerThread();
+        mRawList = rawWidgetsShortcuts;
+        if (DEBUG) {
+            Log.d(TAG, "addWidgetsAndShortcuts, widgetsShortcuts#=" + rawWidgetsShortcuts.size());
+        }
+
+        // Temporary list for {@link PackageItemInfos} to avoid having to go through
+        // {@link mPackageItemInfos} to locate the key to be used for {@link #mWidgetsList}
+        HashMap<String, PackageItemInfo> tmpPackageItemInfos = new HashMap<>();
+
+        // clear the lists.
+        mWidgetsList.clear();
+        mPackageItemInfos.clear();
+
+        // add and update.
+        for (Object o: rawWidgetsShortcuts) {
+            String packageName = "";
+            if (o instanceof LauncherAppWidgetProviderInfo) {
+                LauncherAppWidgetProviderInfo widgetInfo = (LauncherAppWidgetProviderInfo) o;
+                packageName = widgetInfo.provider.getPackageName();
+            } else if (o instanceof ResolveInfo) {
+                ResolveInfo resolveInfo = (ResolveInfo) o;
+                packageName = resolveInfo.activityInfo.packageName;
+            } else {
+                Log.e(TAG, String.format("addWidgetsAndShortcuts, nothing added for class=%s",
+                        o.getClass().toString()));
+            }
+
+            PackageItemInfo pInfo = tmpPackageItemInfos.get(packageName);
+            ArrayList<Object> widgetsShortcutsList = mWidgetsList.get(pInfo);
+            if (widgetsShortcutsList != null) {
+                widgetsShortcutsList.add(o);
+            } else {
+                widgetsShortcutsList = new ArrayList<Object>();
+                widgetsShortcutsList.add(o);
+                pInfo = new PackageItemInfo(packageName);
+                mIconCache.getTitleAndIconForApp(packageName, UserHandleCompat.myUserHandle(),
+                        true /* userLowResIcon */, pInfo);
+                mWidgetsList.put(pInfo, widgetsShortcutsList);
+                tmpPackageItemInfos.put(packageName,  pInfo);
+                mPackageItemInfos.add(pInfo);
+            }
+        }
+
+        // sort.
+        Collections.sort(mPackageItemInfos, mAppNameComparator);
+        for (PackageItemInfo p: mPackageItemInfos) {
+            Collections.sort(mWidgetsList.get(p), mWidgetAndShortcutNameComparator);
+        }
+    }
+}