Fix crash when selecting AppInfo for uninstalled app from Recents.

When an app is uninstalled, the corresponding app info is not removed
fromi the Recents tasks. If user selects that app info entry from the
recents tasks, it will failed to retrieve the app detail as the package
is already removed.

Add the package removed event listener in InstalledAppDetails such
that when the package has been unintalled, its app info task will also
be removed from Recents.

Change-Id: I771507f8f53017f87eda31ddef77a95e30921cbf
Fixes: 28671923

src/com/android/settings/applications/InstalledAppDetails.java

@@ -29,6 +29,7 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.Loader;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageInfo;
@@ -164,6 +165,9 @@ public class InstalledAppDetails extends AppInfoBase
     private Preference mMemoryPreference;
 
     private boolean mDisableAfterUninstall;
+    private boolean mListeningToPackageRemove;
+    private boolean mUninstallRequested;
+
     // Used for updating notification preference.
     private final NotificationBackend mBackend = new NotificationBackend();
 
@@ -336,6 +340,7 @@ public class InstalledAppDetails extends AppInfoBase
         if (mFinishing) {
             return;
         }
+        stopListeningToPackageRemove();
         mState.requestSize(mPackageName, mUserId);
         AppItem app = new AppItem(mAppEntry.info.uid);
         app.addUid(mAppEntry.info.uid);
@@ -352,12 +357,16 @@ public class InstalledAppDetails extends AppInfoBase
     @Override
     public void onPause() {
         getLoaderManager().destroyLoader(LOADER_CHART_DATA);
+        if (!mFinishing && !mUninstallRequested) {
+            startListeningToPackageRemove();
+        }
         super.onPause();
     }
 
     @Override
     public void onDestroy() {
         TrafficStats.closeQuietly(mStatsSession);
+        stopListeningToPackageRemove();
         super.onDestroy();
     }
 
@@ -483,21 +492,22 @@ public class InstalledAppDetails extends AppInfoBase
     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
-        if (requestCode == REQUEST_UNINSTALL) {
+        switch (requestCode) {
+            case REQUEST_UNINSTALL:
                 if (mDisableAfterUninstall) {
                     mDisableAfterUninstall = false;
                     new DisableChanger(this, mAppEntry.info,
                             PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER)
                             .execute((Object)null);
                 }
+                // continue with following operations
+            case REQUEST_REMOVE_DEVICE_ADMIN:
                 if (!refreshUi()) {
                     setIntentAndFinish(true, true);
+                } else {
+                    mUninstallRequested = false;
                 }
-        }
-        if (requestCode == REQUEST_REMOVE_DEVICE_ADMIN) {
-            if (!refreshUi()) {
-                setIntentAndFinish(true, true);
-            }
+                break;
         }
     }
 
@@ -675,6 +685,7 @@ public class InstalledAppDetails extends AppInfoBase
     }
 
     private void uninstallPkg(String packageName, boolean allUsers, boolean andDisable) {
+        mUninstallRequested = true;
          // Create new intent to launch Uninstaller activity
         Uri packageURI = Uri.parse("package:"+packageName);
         Intent uninstallIntent = new Intent(Intent.ACTION_UNINSTALL_PACKAGE, packageURI);
@@ -764,6 +775,7 @@ public class InstalledAppDetails extends AppInfoBase
         String packageName = mAppEntry.info.packageName;
         if (v == mUninstallButton) {
             if (mDpm.packageHasActiveAdmins(mPackageInfo.packageName)) {
+                mUninstallRequested = true;
                 Activity activity = getActivity();
                 Intent uninstallDAIntent = new Intent(activity, DeviceAdminAdd.class);
                 uninstallDAIntent.putExtra(DeviceAdminAdd.EXTRA_DEVICE_ADMIN_PACKAGE_NAME,
@@ -1233,4 +1245,33 @@ public class InstalledAppDetails extends AppInfoBase
             mPermissionsPreference.setSummary(summary);
         }
     };
+
+    private void startListeningToPackageRemove() {
+        if (mListeningToPackageRemove) {
+            return;
+        }
+        mListeningToPackageRemove = true;
+        final IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_REMOVED);
+        filter.addDataScheme("package");
+        getContext().registerReceiver(mPackageRemovedReceiver, filter);
+    }
+
+    private void stopListeningToPackageRemove() {
+        if (!mListeningToPackageRemove) {
+            return;
+        }
+        mListeningToPackageRemove = false;
+        getContext().unregisterReceiver(mPackageRemovedReceiver);
+    }
+
+    private final BroadcastReceiver mPackageRemovedReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            String packageName = intent.getData().getSchemeSpecificPart();
+            if (!mFinishing && mAppEntry.info.packageName.equals(packageName)) {
+                getActivity().finishAndRemoveTask();
+            }
+        }
+    };
+
 }