Fix NPE in InstalledAppDetails activity when app not found.

Added some extra checks to ensure that the activity exits from
onCreate, onResume and processMoveMsg promptly when the app
info cannot be refreshed.

Bug: b/2711730
Change-Id: Ied22fadce09326dd33cf201e5e9281990bf3abbd

src/com/android/settings/InstalledAppDetails.java

@@ -290,14 +290,15 @@ public class InstalledAppDetails extends Activity implements View.OnClickListene
         }
     }
 
-    private void initAppInfo(String packageName) {
+    private boolean initAppInfo(String packageName) {
         try {
             mAppInfo = mPm.getApplicationInfo(packageName,
                     PackageManager.GET_UNINSTALLED_PACKAGES);
+            return true;
         } catch (NameNotFoundException e) {
             Log.e(TAG, "Exception when retrieving package: " + packageName, e);
             showDialogInner(DLG_APP_NOT_FOUND);
-            return;
+            return false;
         }
     }
 
@@ -305,20 +306,26 @@ public class InstalledAppDetails extends Activity implements View.OnClickListene
     @Override
     protected void onCreate(Bundle icicle) {
         super.onCreate(icicle);
+        
         // Get package manager
         mPm = getPackageManager();
+        
         // Get application's name from intent
         Intent intent = getIntent();
         final String packageName = intent.getStringExtra(ManageApplications.APP_PKG_NAME);
-        mComputingStr = getText(R.string.computing_size);
+        if (! initAppInfo(packageName)) {
+            return; // could not find package, finish called
+        }
+        
         // Try retrieving package stats again
         CharSequence totalSizeStr, appSizeStr, dataSizeStr;
+        mComputingStr = getText(R.string.computing_size);
         totalSizeStr = appSizeStr = dataSizeStr = mComputingStr;
         if(localLOGV) Log.i(TAG, "Have to compute package sizes");
         mSizeObserver = new PkgSizeObserver();
-        initAppInfo(packageName);
         setContentView(R.layout.installed_app_details);
         //TODO download str and download url
+        
         // Set default values on sizes
         mTotalSize = (TextView)findViewById(R.id.total_size_text);
         mTotalSize.setText(totalSizeStr);
@@ -326,16 +333,19 @@ public class InstalledAppDetails extends Activity implements View.OnClickListene
         mAppSize.setText(appSizeStr);
         mDataSize = (TextView)findViewById(R.id.data_size_text);
         mDataSize.setText(dataSizeStr);
+        
         // Get Control button panel
         View btnPanel = findViewById(R.id.control_buttons_panel);
         mForceStopButton = (Button) btnPanel.findViewById(R.id.left_button);
         mForceStopButton.setText(R.string.force_stop);
         mUninstallButton = (Button)btnPanel.findViewById(R.id.right_button);
         mForceStopButton.setEnabled(false);
+        
         // Initialize clear data and move install location buttons
         View data_buttons_panel = findViewById(R.id.data_buttons_panel);
         mClearDataButton = (Button) data_buttons_panel.findViewById(R.id.left_button);
         mMoveAppButton = (Button) data_buttons_panel.findViewById(R.id.right_button);
+        
          // Cache section
          mCacheSize = (TextView) findViewById(R.id.cache_size_text);
          mCacheSize.setText(mComputingStr);
@@ -344,6 +354,7 @@ public class InstalledAppDetails extends Activity implements View.OnClickListene
          // Get list of preferred activities
          mActivitiesButton = (Button)findViewById(R.id.clear_activities_button);
          List<ComponentName> prefActList = new ArrayList<ComponentName>();
+         
          // Intent list cannot be null. so pass empty list
          List<IntentFilter> intentList = new ArrayList<IntentFilter>();
          mPm.getPreferredActivities(intentList,  prefActList, packageName);
@@ -395,7 +406,15 @@ public class InstalledAppDetails extends Activity implements View.OnClickListene
     @Override
     public void onResume() {
         super.onResume();
-        initAppInfo(mAppInfo.packageName);
+        
+        if (mAppInfo == null) {
+            setIntentAndFinish(true, true);
+            return; // onCreate must have failed, make sure to exit
+        }
+        if (! initAppInfo(mAppInfo.packageName)) {
+            return; // could not find package, finish called
+        }
+        
         PackageInfo pkgInfo = null;
         // Get application info again to refresh changed properties of application
         try {
@@ -404,11 +423,13 @@ public class InstalledAppDetails extends Activity implements View.OnClickListene
         } catch (NameNotFoundException e) {
             Log.e(TAG, "Exception when retrieving package:" + mAppInfo.packageName, e);
             showDialogInner(DLG_APP_NOT_FOUND);
-            return;
+            return; // could not find package, finish called
         }
+        
         checkForceStop();
         setAppLabelAndIcon(pkgInfo);
         refreshButtons();
+        
         // Refresh size info
         if (mAppInfo != null && mAppInfo.packageName != null) {
             mPm.getPackageSizeInfo(mAppInfo.packageName, mSizeObserver);
@@ -500,8 +521,6 @@ public class InstalledAppDetails extends Activity implements View.OnClickListene
 
     private void refreshButtons() {
         if (!mMoveInProgress) {
-            // Refresh application information again.
-            initAppInfo(mAppInfo.packageName);
             initUninstallButtons();
             initDataButtons();
             initMoveButton();
@@ -517,15 +536,20 @@ public class InstalledAppDetails extends Activity implements View.OnClickListene
         String packageName = mAppInfo.packageName;
         // Refresh the button attributes.
         mMoveInProgress = false;
-        refreshButtons();
         if(result == PackageManager.MOVE_SUCCEEDED) {
             Log.i(TAG, "Moved resources for " + packageName);
             // Refresh size information again.
-            mPm.getPackageSizeInfo(mAppInfo.packageName, mSizeObserver);
+            mPm.getPackageSizeInfo(packageName, mSizeObserver);
         } else {
             mMoveErrorCode = result;
             showDialogInner(DLG_MOVE_FAILED);
         }
+        
+        if (! initAppInfo(packageName)) {
+            return; // could not find package, finish called
+        }
+        
+        refreshButtons();
     }
 
     /*