Added MIME type filter to FileChooserActivity and company.

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

@@ -32,6 +32,7 @@
 import android.support.v4.app.FragmentTransaction;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.webkit.MimeTypeMap;
 import android.widget.Toast;
 
 import java.io.File;
@@ -46,8 +47,10 @@ public class FileChooserActivity extends FragmentActivity implements
         OnBackStackChangedListener, FileListFragment.Callbacks {
 
     public static final String PATH = "path";
+    public static final String MIME_TYPE = "mime_type";
     public static final String EXTERNAL_BASE_PATH = Environment
             .getExternalStorageDirectory().getAbsolutePath();
+    public static final String MIME_TYPE_DEFAULT = "*/*";
 
     private static final boolean HAS_ACTIONBAR = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
 
@@ -61,11 +64,14 @@ public void onReceive(Context context, Intent intent) {
     };
 
     private String mPath;
+    private String mMimeType;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        mMimeType = (getIntent() != null) ? getIntent().getType() : MIME_TYPE_DEFAULT;
+
         mFragmentManager = getSupportFragmentManager();
         mFragmentManager.addOnBackStackChangedListener(this);
 
@@ -144,7 +150,7 @@ 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, mMimeType);
         mFragmentManager.beginTransaction()
                 .add(android.R.id.content, fragment).commit();
     }
@@ -158,7 +164,7 @@ private void addFragment() {
     private void replaceFragment(File file) {
         mPath = file.getAbsolutePath();
 
-        FileListFragment fragment = FileListFragment.newInstance(mPath);
+        FileListFragment fragment = FileListFragment.newInstance(mPath, mMimeType);
         mFragmentManager.beginTransaction()
                 .replace(android.R.id.content, fragment)
                 .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)

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

@@ -17,16 +17,20 @@
 package com.ipaulpro.afilechooser;
 
 import android.content.Context;
+import android.provider.DocumentsContract.Document;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.MimeTypeMap;
 import android.widget.BaseAdapter;
 import android.widget.TextView;
 
 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.ipaulpro.afilechooser.utils.FileUtils;
+
 /**
  * List adapter for Files.
  * 
@@ -41,9 +45,11 @@ public class FileListAdapter extends BaseAdapter {
     private final LayoutInflater mInflater;
 
     private List<File> mData = new ArrayList<File>();
+    private String mMimeType;
 
-    public FileListAdapter(Context context) {
+    public FileListAdapter(Context context, String mimeType) {
         mInflater = LayoutInflater.from(context);
+        mMimeType = mimeType;
     }
 
     public void add(File file) {
@@ -115,7 +121,25 @@ public View getView(int position, View convertView, ViewGroup parent) {
         int icon = file.isDirectory() ? ICON_FOLDER : ICON_FILE;
         view.setCompoundDrawablesWithIntrinsicBounds(icon, 0, 0, 0);
 
+        // Disable visually
+        row.setEnabled(isEnabled(position));
+
         return row;
     }
 
+    @Override
+    public boolean isEnabled(int position) {
+        boolean enable = true;
+
+        File file = getItem(position);
+
+        // Always enabled if a folder
+        if (!file.isDirectory()) {
+            // Set enabled if the MIME types match
+            String concreteType = FileUtils.getMimeType(file);
+            enable = FileUtils.compareMimeTypes(concreteType, mMimeType);
+        }
+
+        return enable;
+    }
 }

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

@@ -60,12 +60,14 @@ public interface Callbacks {
      * Create a new instance with the given file path.
      *
      * @param path The absolute path of the file (directory) to display.
+     * @param mimeType The MIME type for the file.
      * @return A new Fragment with the given file path.
      */
-    public static FileListFragment newInstance(String path) {
+    public static FileListFragment newInstance(String path, String mimeType) {
         FileListFragment fragment = new FileListFragment();
         Bundle args = new Bundle();
         args.putString(FileChooserActivity.PATH, path);
+        args.putString(FileChooserActivity.MIME_TYPE, mimeType);
         fragment.setArguments(args);
 
         return fragment;
@@ -86,11 +88,15 @@ public void onAttach(Activity activity) {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        String mimeType = getArguments() != null ? getArguments().getString(
+                FileChooserActivity.MIME_TYPE)
+                : FileChooserActivity.MIME_TYPE_DEFAULT;
 
-        mAdapter = new FileListAdapter(getActivity());
+        mAdapter = new FileListAdapter(getActivity(), mimeType);
         mPath = getArguments() != null ? getArguments().getString(
                 FileChooserActivity.PATH) : Environment
                 .getExternalStorageDirectory().getAbsolutePath();
+
     }
 
     @Override

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

@@ -159,6 +159,33 @@ public static String getMimeType(Context context, Uri uri) {
         return getMimeType(file);
     }
 
+    /**
+     * Helper to compare two MIME types, where one may be a pattern.
+     * 
+     * @param concreteType A fully-specified MIME type.
+     * @param desiredType A desired MIME type that may be a pattern such as *\/*.
+     * @return Returns true if the two MIME types match.
+     */
+    public static boolean compareMimeTypes(String concreteType, String desiredType) {
+        final int typeLength = desiredType.length();
+        if (typeLength == 3 && desiredType.equals("*/*")) {
+            return true;
+        }
+
+        final int slashpos = desiredType.indexOf('/');
+        if (slashpos > 0) {
+            if (typeLength == slashpos+2 && desiredType.charAt(slashpos+1) == '*') {
+                if (desiredType.regionMatches(0, concreteType, 0, slashpos+1)) {
+                    return true;
+                }
+            } else if (desiredType.equals(concreteType)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     /**
      * @param uri The Uri to check.
      * @return Whether the Uri authority is {@link LocalStorageProvider}.