LibreOffice4Android: Fix NullPointerException

The member fileNames was being correctly set in createUI() but it was
being reset at openDirectory(). The only purpose of this member was
sending the file name to open() method, but we can rewrite open() to
accept File objects so fileNames became useless and was removed.

Change-Id: I944be8ff13d221573a5a7accf0081c30872c62f0

android/experimental/LibreOffice4Android/src/org/libreoffice/ui/LibreOfficeUIActivity.java

@@ -21,6 +21,7 @@ import java.util.Date;
 import java.util.prefs.Preferences;
 
 import android.graphics.drawable.BitmapDrawable;
+import android.net.Uri;
 import android.os.Build;
 import android.graphics.Shader.TileMode;
 import android.graphics.BlurMaskFilter;
@@ -34,6 +35,7 @@ import android.app.Activity;
 import android.os.AsyncTask;
 import android.graphics.Bitmap;
 import android.graphics.Matrix;
+import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -93,7 +95,6 @@ public class LibreOfficeUIActivity extends Activity implements ActionBar.OnNavig
 	
 	FileFilter fileFilter;
 	FilenameFilter filenameFilter;
-	private String[] fileNames;
 	private File[] filePaths;
 	
 	
@@ -173,17 +174,15 @@ public class LibreOfficeUIActivity extends Activity implements ActionBar.OnNavig
 	        // code to make a grid view
         	setContentView(R.layout.file_grid);
 	    	gv = (GridView)findViewById(R.id.file_explorer_grid_view);
-        	fileNames = currentDirectory.list( FileUtilities.getFilenameFilter( filterMode ) );
         	filePaths = currentDirectory.listFiles( FileUtilities.getFileFilter( filterMode ) );
 	        gv.setOnItemClickListener(new OnItemClickListener() {
 	            public void onItemClick(AdapterView<?> parent, View view,
 	                int position, long id) {
 	            	File file = filePaths[position];
 	            	if(!file.isDirectory()){
-	            		open(fileNames[position]);
+                        open(file);
 	            	}else{
-	            		file = new File( currentDirectory, file.getName() );
-	            		openDirectory( file );
+                        openDirectory( file );
 	            	}
 	            		
 	            }
@@ -194,7 +193,6 @@ public class LibreOfficeUIActivity extends Activity implements ActionBar.OnNavig
         	setContentView(R.layout.file_list);
         	lv = (ListView)findViewById( R.id.file_explorer_list_view);
         	lv.setClickable(true);
-        	fileNames = currentDirectory.list( FileUtilities.getFilenameFilter( filterMode ) );
         	filePaths = currentDirectory.listFiles( FileUtilities.getFileFilter( filterMode ) );
         	lv.setAdapter( new ListItemAdapter(getApplicationContext(), filePaths) );
         	actionBar.setSelectedNavigationItem( filterMode + 1 );
@@ -212,7 +210,6 @@ public class LibreOfficeUIActivity extends Activity implements ActionBar.OnNavig
             actionBar.setDisplayHomeAsUpEnabled( false );
         }
     	filePaths = currentDirectory.listFiles( FileUtilities.getFileFilter( filterMode ) );
-    	fileNames = new String[ filePaths.length ];
     	FileUtilities.sortFiles( filePaths, sortMode );
 /*
     	for( int i = 0; i < fileNames.length; i++){
@@ -230,7 +227,7 @@ public class LibreOfficeUIActivity extends Activity implements ActionBar.OnNavig
     	}
     }
     
-    public void open(String file){
+    public void open(File file) {
     	/*
     	Intent i = new Intent( this , WriterViewerActivity.class );
     	i.putExtra( CURRENT_DIRECTORY_KEY , currentDirectory.getAbsolutePath() );
@@ -239,7 +236,7 @@ public class LibreOfficeUIActivity extends Activity implements ActionBar.OnNavig
     	startActivity( i );
     	*/
     	Intent i = new Intent( this , DocumentLoader.class );
-    	i.putExtra("input",new File( currentDirectory , file).getAbsolutePath() );
+        i.putExtra("input", file.getAbsolutePath() );
     	i.putExtra( CURRENT_DIRECTORY_KEY , currentDirectory.getAbsolutePath() );
     	i.putExtra( FILTER_MODE_KEY  , filterMode );
     	i.putExtra( EXPLORER_VIEW_TYPE_KEY  , viewMode );
@@ -546,7 +543,7 @@ class ListItemAdapter implements ListAdapter{
 					if(filePaths[ pos ].isDirectory() ){
 						openDirectory( filePaths[ pos ] );
 					}else{
-						open( filePaths[ pos ].getName() );
+                        open( filePaths[ pos ] );
 					}
 				}
 			});