android: disable navigation drawer for Writer

Writer documents currently always have one part, so it's not possible to
switch to an other part anyway. Also hide the matching menu item
accordingly.

Change-Id: Ic634d46c4ff307416b2878e5bc8a590b22a827a0

android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitTileProvider.java

@@ -71,7 +71,8 @@ public class LOKitTileProvider implements TileProvider {
 
         LibreOfficeMainActivity.mAppContext.getDocumentPartView().clear();
 
-        if (parts > 1) {
+        // Writer documents always have one part, so hide the navigation drawer.
+        if (mDocument.getDocumentType() != Document.DOCTYPE_TEXT) {
             for (int i = 0; i < parts; i++) {
                 String partName = mDocument.getPartName(i);
                 if (partName.isEmpty()) {
@@ -84,6 +85,8 @@ public class LOKitTileProvider implements TileProvider {
                 final DocumentPartView partView = new DocumentPartView(i, partName, thumbnail(128));
                 LibreOfficeMainActivity.mAppContext.getDocumentPartView().add(partView);
             }
+        } else {
+            LibreOfficeMainActivity.mAppContext.disableNavigationDrawer();
         }
 
         mDocument.setPart(0);

android/experimental/LOAndroid3/src/java/org/libreoffice/LibreOfficeMainActivity.java

@@ -72,7 +72,9 @@ public class LibreOfficeMainActivity extends Activity {
     public boolean onPrepareOptionsMenu(Menu menu) {
         // If the nav drawer is open, hide action items related to the content view
         boolean isDrawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
-        menu.findItem(R.id.action_parts).setVisible(!isDrawerOpen);
+        // Do the same in case the drawer is locked.
+        boolean isDrawerLocked = mDrawerLayout.getDrawerLockMode(mDrawerList) != DrawerLayout.LOCK_MODE_UNLOCKED;
+        menu.findItem(R.id.action_parts).setVisible(!isDrawerOpen && !isDrawerLocked);
         return super.onPrepareOptionsMenu(menu);
     }
 
@@ -169,6 +171,16 @@ public class LibreOfficeMainActivity extends Activity {
         return mDocumentPartView;
     }
 
+    public void disableNavigationDrawer() {
+        // Only the original thread that created mDrawerLayout should touch its views.
+        LOKitShell.getMainHandler().post(new Runnable() {
+            @Override
+            public void run() {
+                mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED, mDrawerList);
+            }
+        });
+    }
+
     public DocumentPartViewListAdapter getDocumentPartViewListAdapter() {
         return mDocumentPartViewListAdapter;
     }