Added option to specify a list of file extensions for narrowing the list...

README.markdown

@@ -66,6 +66,29 @@ A more robust example can be found in the aFileChooserExample folder.
 
 __Note__ The `FileUtils` class provides a helper method to construct an `ACTION_GET_CONTENT` Intent (`FileUtils.createGetContentIntent()`). It also contains a method to convert a `Uri` into a `File` (`FileUtils.getFile(Uri)`).
 
+###Filtering by file extension
+
+Provide an extra `EXTRA_FILTER_INCLUDE_EXTENSIONS` which is an `ArrayList<String>` containing all the extensions that must be included. Note that the extentions must begin with a dot character. The behavior of this extra is specified as follows:
+
+  - If this extra is specified, then **only** files with the supplied extensions will be shown. All other files will be hidden.
+  - If this extra is not specified, or it is an empty `ArrayList`, then no filtering is performed.
+
+Example:
+
+```
+	private static final ArrayList<String> INCLUDE_EXTENSIONS_LIST = new ArrayList<String>();
+	static{
+		INCLUDE_EXTENSIONS_LIST.add(".apk");
+		INCLUDE_EXTENSIONS_LIST.add(".bin");
+	}
+	//...
+	//...
+	Intent intent = new Intent(this, FileChooserActivity.class);
+	intent.putStringArrayListExtra(FileChooserActivity.EXTRA_FILTER_INCLUDE_EXTENSIONS, INCLUDE_EXTENSIONS_LIST);
+	//Use this intent in startActivityForResult()
+
+```
+
 ## Credits
 
 Developed by Paul Burke (iPaulPro) - [paulburke.co](http://paulburke.co/)

aFileChooser/src/com/ipaulpro/afilechooser/FileChooserActivity.java

@@ -16,6 +16,7 @@
 
 package com.ipaulpro.afilechooser;
 
+import android.annotation.SuppressLint;
 import android.app.ActionBar;
 import android.content.BroadcastReceiver;
 import android.content.Context;
@@ -35,6 +36,8 @@
 import android.widget.Toast;
 
 import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Main Activity that handles the FileListFragments 
@@ -48,6 +51,9 @@ public class FileChooserActivity extends FragmentActivity implements
 		OnBackStackChangedListener {
 
     public static final String PATH = "path";
+    public static final String EXTRA_FILTER_INCLUDE_EXTENSIONS = 
+    		"com.ipaulpro.afilechooser.EXTRA_FILTER_INCLUDE_EXTENSIONS";
+    private ArrayList<String> mFilterIncludeExtensions = new ArrayList<String>();
 	public static final String EXTERNAL_BASE_PATH = Environment
 			.getExternalStorageDirectory().getAbsolutePath();
 
@@ -69,6 +75,11 @@ protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
 		setContentView(R.layout.chooser);
+
+		Intent intent = getIntent();
+		if(intent != null){
+			mFilterIncludeExtensions = intent.getStringArrayListExtra(EXTRA_FILTER_INCLUDE_EXTENSIONS);
+		}
 
 		mFragmentManager = getSupportFragmentManager();
 		mFragmentManager.addOnBackStackChangedListener(this);
@@ -104,6 +115,7 @@ protected void onSaveInstanceState(Bundle outState) {
 		outState.putString(PATH, mPath);
 	}
 
+	@SuppressLint("NewApi") // Usages of New APIs are surrounded by sufficient conditional checks
 	@Override
 	public void onBackStackChanged() {
 
@@ -119,6 +131,7 @@ public void onBackStackChanged() {
 		if (HAS_ACTIONBAR) invalidateOptionsMenu();
 	}
 
+	@SuppressLint("NewApi") // Usages of New APIs are surrounded by sufficient conditional checks
 	@Override
 	public boolean onCreateOptionsMenu(Menu menu) {
         if (HAS_ACTIONBAR) {
@@ -147,7 +160,7 @@ public boolean onOptionsItemSelected(MenuItem item) {
 	 * Add the initial Fragment with given path.
 	 */
 	private void addFragment() {
-		FileListFragment fragment = FileListFragment.newInstance(mPath);
+		FileListFragment fragment = FileListFragment.newInstance(mPath, mFilterIncludeExtensions);
 		mFragmentManager.beginTransaction()
 				.add(R.id.explorer_fragment, fragment).commit();
 	}
@@ -161,7 +174,7 @@ private void addFragment() {
 	private void replaceFragment(File file) {
         mPath = file.getAbsolutePath();
 
-        FileListFragment fragment = FileListFragment.newInstance(mPath);
+        FileListFragment fragment = FileListFragment.newInstance(mPath, mFilterIncludeExtensions);
 		mFragmentManager.beginTransaction()
 				.replace(R.id.explorer_fragment, fragment)
 				.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)

aFileChooser/src/com/ipaulpro/afilechooser/FileListFragment.java

@@ -25,6 +25,7 @@
 import android.widget.ListView;
 
 import java.io.File;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -42,17 +43,21 @@ public class FileListFragment extends ListFragment implements
 
 	private FileListAdapter mAdapter;
 	private String mPath;
+	private ArrayList<String> mFilterIncludeExtensions = new ArrayList<String>();
 
 	/**
 	 * Create a new instance with the given file path.
 	 * 
 	 * @param path The absolute path of the file (directory) to display.
 	 * @return A new Fragment with the given file path. 
 	 */
-	public static FileListFragment newInstance(String path) {
+	public static FileListFragment newInstance(String path, ArrayList<String> 
+			filterIncludeExtensions) {
 		FileListFragment fragment = new FileListFragment();
 		Bundle args = new Bundle();
 		args.putString(FileChooserActivity.PATH, path);
+		args.putStringArrayList(FileChooserActivity.EXTRA_FILTER_INCLUDE_EXTENSIONS, 
+				filterIncludeExtensions);
 		fragment.setArguments(args);
 
 		return fragment;
@@ -66,6 +71,10 @@ public void onCreate(Bundle savedInstanceState) {
 		mPath = getArguments() != null ? getArguments().getString(
 				FileChooserActivity.PATH) : Environment
 				.getExternalStorageDirectory().getAbsolutePath();
+		if(getArguments() != null){
+			mFilterIncludeExtensions = getArguments().getStringArrayList(
+					FileChooserActivity.EXTRA_FILTER_INCLUDE_EXTENSIONS);
+		}
 	}
 
 	@Override
@@ -91,7 +100,7 @@ public void onListItemClick(ListView l, View v, int position, long id) {
 
 	@Override
 	public Loader<List<File>> onCreateLoader(int id, Bundle args) {
-		return new FileLoader(getActivity(), mPath);
+		return new FileLoader(getActivity(), mPath, mFilterIncludeExtensions);
 	}
 
 	@Override

aFileChooser/src/com/ipaulpro/afilechooser/FileLoader.java

@@ -17,6 +17,7 @@
 package com.ipaulpro.afilechooser;
 
 import java.io.File;
+import java.util.ArrayList;
 import java.util.List;
 
 import android.content.Context;
@@ -44,15 +45,17 @@ public class FileLoader extends AsyncTaskLoader<List<File>> {
 
 	private List<File> mData;
 	private String mPath;
+	private ArrayList<String> mFilterIncludeExtensions;
 
-	public FileLoader(Context context, String path) {
+	public FileLoader(Context context, String path, ArrayList<String> filterIncludeExtensions) {
 		super(context);
 		this.mPath = path;
+		this.mFilterIncludeExtensions = filterIncludeExtensions;
 	}
 
 	@Override
 	public List<File> loadInBackground() {
-		return FileUtils.getFileList(mPath);
+		return FileUtils.getFileList(mPath, mFilterIncludeExtensions);
 	}
 
 	@Override

aFileChooser/src/com/ipaulpro/afilechooser/utils/FileUtils.java

@@ -407,6 +407,31 @@ public int compare(File f1, File f2) {
 		}
 	};
 
+	/**
+	 * File Filter that includes only files with the specified extensions to pass
+	 * @author Kiran Rao
+	 *
+	 */
+	private static class FileExtensionFilter implements FileFilter{
+		private ArrayList<String> mFilterIncludeExtensions;
+
+		public FileExtensionFilter(ArrayList<String> filterIncludeExtensions){
+			this.mFilterIncludeExtensions = filterIncludeExtensions;
+		}
+
+		@Override
+		public boolean accept(File file) {
+			final String fileName = file.getName();
+			boolean passesExtensionsFilter =  mFilterIncludeExtensions.isEmpty()
+					? true: mFilterIncludeExtensions.contains(getExtension(Uri
+					.fromFile(file).toString()));
+			// Return files only (not directories) and skip hidden files
+			return file.isFile() && !fileName.startsWith(HIDDEN_PREFIX) && 
+					passesExtensionsFilter;
+		}
+
+	}
+
 	/**
 	 * File (not directories) filter.
 	 * 
@@ -441,7 +466,7 @@ public boolean accept(File file) {
 
 	 * @author paulburke
 	 */
-	public static List<File> getFileList(String path) {
+	public static List<File> getFileList(String path, ArrayList<String> filterIncludeExtensions) {
 		ArrayList<File> list = new ArrayList<File>();
 
 		// Current directory File instance
@@ -457,7 +482,7 @@ public static List<File> getFileList(String path) {
 		}
 
 		// List file in this directory with the file filter
-		final File[] files = pathDir.listFiles(mFileFilter);
+		final File[] files = pathDir.listFiles(new FileExtensionFilter(filterIncludeExtensions));
 		if (files != null) {
 			// Sort the files alphabetically
 			Arrays.sort(files, mComparator);

aFileChooserExample/src/com/ipaulpro/afilechooserexample/FileChooserExampleActivity.java

@@ -17,6 +17,7 @@
 package com.ipaulpro.afilechooserexample;
 
 import java.io.File;
+import java.util.ArrayList;
 
 import android.app.Activity;
 import android.content.ActivityNotFoundException;
@@ -29,6 +30,7 @@
 import android.widget.Button;
 import android.widget.Toast;
 
+import com.ipaulpro.afilechooser.FileChooserActivity;
 import com.ipaulpro.afilechooser.utils.FileUtils;
 
 /**
@@ -37,6 +39,11 @@
 public class FileChooserExampleActivity extends Activity {
 
 	private static final int REQUEST_CODE = 6384; // onActivityResult request code
+	private static final ArrayList<String> INCLUDE_EXTENSIONS_LIST = new ArrayList<String>();
+	static{
+		INCLUDE_EXTENSIONS_LIST.add(".apk");
+		INCLUDE_EXTENSIONS_LIST.add(".bin");
+	}
 
 	@Override
 	public void onCreate(Bundle savedInstanceState) {
@@ -49,7 +56,8 @@ public void onCreate(Bundle savedInstanceState) {
 			@Override
 			public void onClick(View v) {
 				// Display the file chooser dialog
-				showChooser();
+				//showChooser();
+				startFileChooserActivity();
 			}
 		});
 
@@ -69,6 +77,14 @@ private void showChooser() {
 		}				
 	}
 
+	private void startFileChooserActivity(){
+		startActivityForResult(
+				new Intent(this, FileChooserActivity.class).putStringArrayListExtra(
+						FileChooserActivity.EXTRA_FILTER_INCLUDE_EXTENSIONS, INCLUDE_EXTENSIONS_LIST), 
+						REQUEST_CODE);
+
+	}
+
 	@Override
 	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 		switch (requestCode) {