Support multi-select in storage UI.

When caller has specified that multiple documents are okay, enable
multi-select action mode.  Currently only allows document selection,
not directories.  Returns multiple documents through ClipData.

Fix bug where GridView was stuck with 2 columns on tablets.

Change-Id: Id49b29a86330639b56fa116d37e7f0d874980c5b

2 files changed, 129 insertions, 10 deletions

diff --git a/packages/DocumentsUI/src/com/android/documentsui/DirectoryFragment.java b/packages/DocumentsUI/src/com/android/documentsui/DirectoryFragment.java
index 5ba1930..bae42d5 100644
--- a/packages/DocumentsUI/src/com/android/documentsui/DirectoryFragment.java
+++ b/packages/DocumentsUI/src/com/android/documentsui/DirectoryFragment.java
@@ -29,12 +29,16 @@ import android.os.Bundle;
 import android.provider.DocumentsContract;
 import android.provider.DocumentsContract.DocumentColumns;
 import android.text.format.DateUtils;
+import android.util.SparseBooleanArray;
+import android.view.ActionMode;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.AbsListView;
+import android.widget.AbsListView.MultiChoiceModeListener;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.CursorAdapter;
@@ -44,6 +48,9 @@ import android.widget.ListView;
 import android.widget.TextView;
 
 import com.android.documentsui.DocumentsActivity.Document;
+import com.google.android.collect.Lists;
+
+import java.util.ArrayList;
 
 /**
  * Display the documents inside a single directory.
@@ -52,11 +59,12 @@ public class DirectoryFragment extends Fragment {
 
     // TODO: show storage backend in item views when requested
     // TODO: implement sorting dialog
-    // TODO: support multiple selection with actionmode
 
     private ListView mListView;
     private GridView mGridView;
 
+    private AbsListView mCurrentView;
+
     private DocumentsAdapter mAdapter;
     private LoaderCallbacks<Cursor> mCallbacks;
 
@@ -64,16 +72,19 @@ public class DirectoryFragment extends Fragment {
 
     private static final String EXTRA_URI = "uri";
     private static final String EXTRA_MODE = "display_mode";
+    private static final String EXTRA_ALLOW_MULTIPLE = "allow_multiple";
 
     private static final int MODE_LIST = 1;
     private static final int MODE_GRID = 2;
 
     private static final int LOADER_DOCUMENTS = 2;
 
-    public static void show(FragmentManager fm, Uri uri, String displayName) {
+    public static void show(
+            FragmentManager fm, Uri uri, String displayName, boolean allowMultiple) {
         final Bundle args = new Bundle();
         args.putParcelable(EXTRA_URI, uri);
         args.putInt(EXTRA_MODE, MODE_LIST);
+        args.putBoolean(EXTRA_ALLOW_MULTIPLE, allowMultiple);
 
         final DirectoryFragment fragment = new DirectoryFragment();
         fragment.setArguments(args);
@@ -100,9 +111,11 @@ public class DirectoryFragment extends Fragment {
 
         mListView = (ListView) view.findViewById(R.id.list);
         mListView.setOnItemClickListener(mItemListener);
+        mListView.setMultiChoiceModeListener(mMultiListener);
 
         mGridView = (GridView) view.findViewById(R.id.grid);
         mGridView.setOnItemClickListener(mItemListener);
+        mGridView.setMultiChoiceModeListener(mMultiListener);
 
         mAdapter = new DocumentsAdapter(context);
         updateMode();
@@ -184,13 +197,27 @@ public class DirectoryFragment extends Fragment {
         mListView.setVisibility(mode == MODE_LIST ? View.VISIBLE : View.GONE);
         mGridView.setVisibility(mode == MODE_GRID ? View.VISIBLE : View.GONE);
 
+        final int choiceMode;
+        if (getArguments().getBoolean(EXTRA_ALLOW_MULTIPLE)) {
+            choiceMode = ListView.CHOICE_MODE_MULTIPLE_MODAL;
+        } else {
+            choiceMode = ListView.CHOICE_MODE_NONE;
+        }
+
         if (mode == MODE_GRID) {
             mListView.setAdapter(null);
+            mListView.setChoiceMode(ListView.CHOICE_MODE_NONE);
             mGridView.setAdapter(mAdapter);
+            mGridView.setColumnWidth(getResources().getDimensionPixelSize(R.dimen.grid_width));
             mGridView.setNumColumns(GridView.AUTO_FIT);
+            mGridView.setChoiceMode(choiceMode);
+            mCurrentView = mGridView;
         } else {
             mGridView.setAdapter(null);
+            mGridView.setChoiceMode(ListView.CHOICE_MODE_NONE);
             mListView.setAdapter(mAdapter);
+            mListView.setChoiceMode(choiceMode);
+            mCurrentView = mListView;
         }
     }
 
@@ -198,13 +225,69 @@ public class DirectoryFragment extends Fragment {
         @Override
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
             final Cursor cursor = (Cursor) mAdapter.getItem(position);
-
             final Uri uri = getArguments().getParcelable(EXTRA_URI);
             final Document doc = Document.fromCursor(uri.getAuthority(), cursor);
             ((DocumentsActivity) getActivity()).onDocumentPicked(doc);
         }
     };
 
+    private MultiChoiceModeListener mMultiListener = new MultiChoiceModeListener() {
+        @Override
+        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
+            mode.getMenuInflater().inflate(R.menu.mode_directory, menu);
+            return true;
+        }
+
+        @Override
+        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
+            return true;
+        }
+
+        @Override
+        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
+            if (item.getItemId() == R.id.menu_open) {
+                final Uri uri = getArguments().getParcelable(EXTRA_URI);
+                final SparseBooleanArray checked = mCurrentView.getCheckedItemPositions();
+                final ArrayList<Document> docs = Lists.newArrayList();
+
+                final int size = checked.size();
+                for (int i = 0; i < size; i++) {
+                    if (checked.valueAt(i)) {
+                        final Cursor cursor = (Cursor) mAdapter.getItem(checked.keyAt(i));
+                        docs.add(Document.fromCursor(uri.getAuthority(), cursor));
+                    }
+                }
+
+                ((DocumentsActivity) getActivity()).onDocumentsPicked(docs);
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        @Override
+        public void onDestroyActionMode(ActionMode mode) {
+            // ignored
+        }
+
+        @Override
+        public void onItemCheckedStateChanged(
+                ActionMode mode, int position, long id, boolean checked) {
+            if (checked) {
+                final Cursor cursor = (Cursor) mAdapter.getItem(position);
+                final String mimeType = getCursorString(cursor, DocumentColumns.MIME_TYPE);
+
+                // Directories cannot be checked
+                if (DocumentsContract.MIME_TYPE_DIRECTORY.equals(mimeType)) {
+                    mCurrentView.setItemChecked(position, false);
+                }
+            }
+
+            mode.setTitle(getResources()
+                    .getString(R.string.mode_selected_count, mCurrentView.getCheckedItemCount()));
+        }
+    };
+
     private boolean getSupportsCreate() {
         return (mFlags & DocumentsContract.FLAG_SUPPORTS_CREATE) != 0;
     }
diff --git a/packages/DocumentsUI/src/com/android/documentsui/DocumentsActivity.java b/packages/DocumentsUI/src/com/android/documentsui/DocumentsActivity.java
index c83edc4..ca4ea82 100644
--- a/packages/DocumentsUI/src/com/android/documentsui/DocumentsActivity.java
+++ b/packages/DocumentsUI/src/com/android/documentsui/DocumentsActivity.java
@@ -24,6 +24,8 @@ import android.app.Activity;
 import android.app.FragmentManager;
 import android.app.FragmentManager.BackStackEntry;
 import android.app.FragmentManager.OnBackStackChangedListener;
+import android.content.ClipData;
+import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -44,6 +46,9 @@ import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.TextView;
 
+import java.util.Arrays;
+import java.util.List;
+
 public class DocumentsActivity extends Activity {
     private static final String TAG = "Documents";
 
@@ -54,6 +59,9 @@ public class DocumentsActivity extends Activity {
     private static final int MODE_CREATE = 2;
 
     private int mMode;
+    private boolean mAllowMultiple;
+    private String[] mAcceptMimes;
+
     private boolean mIgnoreNextNavigation;
 
     private Uri mCurrentDir;
@@ -63,11 +71,20 @@ public class DocumentsActivity extends Activity {
     public void onCreate(Bundle icicle) {
         super.onCreate(icicle);
 
-        final String action = getIntent().getAction();
+        final Intent intent = getIntent();
+        final String action = intent.getAction();
         if (Intent.ACTION_OPEN_DOCUMENT.equals(action)) {
             mMode = MODE_OPEN;
+            mAllowMultiple = intent.getBooleanExtra(Intent.EXTRA_ALLOW_MULTIPLE, false);
         } else if (Intent.ACTION_CREATE_DOCUMENT.equals(action)) {
             mMode = MODE_CREATE;
+            mAllowMultiple = false;
+        }
+
+        if (intent.hasExtra(Intent.EXTRA_MIME_TYPES)) {
+            mAcceptMimes = intent.getStringArrayExtra(Intent.EXTRA_MIME_TYPES);
+        } else {
+            mAcceptMimes = new String[] { intent.getType() };
         }
 
         setResult(Activity.RESULT_CANCELED);
@@ -208,14 +225,14 @@ public class DocumentsActivity extends Activity {
         final Uri uri = DocumentsContract.buildDocumentUri(
                 info.authority, DocumentsContract.ROOT_GUID);
         final CharSequence displayName = info.loadLabel(getPackageManager());
-        DirectoryFragment.show(getFragmentManager(), uri, displayName.toString());
+        DirectoryFragment.show(getFragmentManager(), uri, displayName.toString(), mAllowMultiple);
     }
 
     public void onDocumentPicked(Document doc) {
         final FragmentManager fm = getFragmentManager();
         if (DocumentsContract.MIME_TYPE_DIRECTORY.equals(doc.mimeType)) {
             // Nested directory picked, recurse using new fragment
-            DirectoryFragment.show(fm, doc.uri, doc.displayName);
+            DirectoryFragment.show(fm, doc.uri, doc.displayName, mAllowMultiple);
         } else if (mMode == MODE_OPEN) {
             // Explicit file picked, return
             onFinished(doc.uri);
@@ -225,16 +242,35 @@ public class DocumentsActivity extends Activity {
         }
     }
 
+    public void onDocumentsPicked(List<Document> docs) {
+        final int size = docs.size();
+        final Uri[] uris = new Uri[size];
+        for (int i = 0; i < size; i++) {
+            uris[i] = docs.get(i).uri;
+        }
+        onFinished(uris);
+    }
+
     public void onSaveRequested(String mimeType, String displayName) {
         // TODO: create file, confirming before overwriting
-        onFinished(null);
+        final Uri uri = null;
+        onFinished(uri);
     }
 
-    private void onFinished(Uri uri) {
-        Log.d(TAG, "onFinished() " + uri);
+    private void onFinished(Uri... uris) {
+        Log.d(TAG, "onFinished() " + Arrays.toString(uris));
 
         final Intent intent = new Intent();
-        intent.setData(uri);
+        if (uris.length == 1) {
+            intent.setData(uris[0]);
+        } else if (uris.length > 1) {
+            final ContentResolver resolver = getContentResolver();
+            final ClipData clipData = new ClipData(null, mAcceptMimes, new ClipData.Item(uris[0]));
+            for (int i = 1; i < uris.length; i++) {
+                clipData.addItem(new ClipData.Item(uris[i]));
+            }
+            intent.setClipData(clipData);
+        }
 
         intent.addFlags(
                 Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_PERSIST_GRANT_URI_PERMISSION);