DirectoryFragment.java revision 9e0036ed7d3260d79cc5f9ffd8e3bbe760699924 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.documentsui;
18
19import android.app.FragmentManager;
20import android.app.FragmentTransaction;
21import android.app.ListFragment;
22import android.app.LoaderManager.LoaderCallbacks;
23import android.content.Context;
24import android.content.CursorLoader;
25import android.content.Loader;
26import android.database.Cursor;
27import android.net.Uri;
28import android.os.Bundle;
29import android.provider.DocumentsContract;
30import android.provider.DocumentsContract.DocumentColumns;
31import android.view.LayoutInflater;
32import android.view.View;
33import android.view.ViewGroup;
34import android.widget.CursorAdapter;
35import android.widget.ImageView;
36import android.widget.ListView;
37import android.widget.TextView;
38
39public class DirectoryFragment extends ListFragment {
40    private DocumentsAdapter mAdapter;
41    private LoaderCallbacks<Cursor> mCallbacks;
42
43    private static final String EXTRA_URI = "uri";
44
45    private static final int LOADER_DOCUMENTS = 2;
46
47    public static void show(FragmentManager fm, Uri uri, CharSequence title) {
48        final Bundle args = new Bundle();
49        args.putParcelable(EXTRA_URI, uri);
50
51        final DirectoryFragment fragment = new DirectoryFragment();
52        fragment.setArguments(args);
53
54        final FragmentTransaction ft = fm.beginTransaction();
55        ft.replace(android.R.id.content, fragment);
56        ft.addToBackStack(title.toString());
57        ft.setBreadCrumbTitle(title);
58        ft.commitAllowingStateLoss();
59    }
60
61    @Override
62    public View onCreateView(
63            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
64        final Context context = inflater.getContext();
65
66        mAdapter = new DocumentsAdapter(context);
67        setListAdapter(mAdapter);
68
69        mCallbacks = new LoaderCallbacks<Cursor>() {
70            @Override
71            public Loader<Cursor> onCreateLoader(int id, Bundle args) {
72                final Uri uri = args.getParcelable(EXTRA_URI);
73                return new CursorLoader(context, uri, null, null, null, null);
74            }
75
76            @Override
77            public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
78                mAdapter.swapCursor(data);
79            }
80
81            @Override
82            public void onLoaderReset(Loader<Cursor> loader) {
83                mAdapter.swapCursor(null);
84            }
85        };
86
87        return super.onCreateView(inflater, container, savedInstanceState);
88    }
89
90    @Override
91    public void onStart() {
92        super.onStart();
93        getLoaderManager().restartLoader(LOADER_DOCUMENTS, getArguments(), mCallbacks);
94    }
95
96    @Override
97    public void onStop() {
98        super.onStop();
99        getLoaderManager().destroyLoader(LOADER_DOCUMENTS);
100    }
101
102    @Override
103    public void onListItemClick(ListView l, View v, int position, long id) {
104        final Cursor cursor = (Cursor) mAdapter.getItem(position);
105        final String guid = getCursorString(cursor, DocumentColumns.GUID);
106        final String mimeType = getCursorString(cursor, DocumentColumns.MIME_TYPE);
107
108        final Uri uri = getArguments().getParcelable(EXTRA_URI);
109        final Uri childUri = DocumentsContract.buildDocumentUri(uri.getAuthority(), guid);
110
111        if (DocumentsContract.MIME_TYPE_DIRECTORY.equals(mimeType)) {
112            // Nested directory picked, recurse using new fragment
113            final Uri childContentsUri = DocumentsContract.buildContentsUri(childUri);
114            final String displayName = cursor.getString(
115                    cursor.getColumnIndex(DocumentColumns.DISPLAY_NAME));
116            DirectoryFragment.show(getFragmentManager(), childContentsUri, displayName);
117        } else {
118            // Explicit file picked, return
119            ((DocumentsActivity) getActivity()).onDocumentPicked(childUri);
120        }
121    }
122
123    private class DocumentsAdapter extends CursorAdapter {
124        public DocumentsAdapter(Context context) {
125            super(context, null, false);
126        }
127
128        @Override
129        public View newView(Context context, Cursor cursor, ViewGroup parent) {
130            return LayoutInflater.from(context)
131                    .inflate(com.android.internal.R.layout.preference, parent, false);
132        }
133
134        @Override
135        public void bindView(View view, Context context, Cursor cursor) {
136            final TextView title = (TextView) view.findViewById(android.R.id.title);
137            final TextView summary = (TextView) view.findViewById(android.R.id.summary);
138            final ImageView icon = (ImageView) view.findViewById(android.R.id.icon);
139
140            icon.setMaxWidth(128);
141            icon.setMaxHeight(128);
142
143            final String guid = getCursorString(cursor, DocumentColumns.GUID);
144            final String displayName = getCursorString(cursor, DocumentColumns.DISPLAY_NAME);
145            final String mimeType = getCursorString(cursor, DocumentColumns.MIME_TYPE);
146            final int flags = getCursorInt(cursor, DocumentColumns.FLAGS);
147
148            if ((flags & DocumentsContract.FLAG_SUPPORTS_THUMBNAIL) != 0) {
149                final Uri uri = getArguments().getParcelable(EXTRA_URI);
150                final Uri childUri = DocumentsContract.buildDocumentUri(uri.getAuthority(), guid);
151                icon.setImageURI(childUri);
152            } else {
153                icon.setImageURI(null);
154            }
155
156            title.setText(displayName);
157            summary.setText(mimeType);
158        }
159    }
160
161    private static String getCursorString(Cursor cursor, String columnName) {
162        return cursor.getString(cursor.getColumnIndex(columnName));
163    }
164
165    private static int getCursorInt(Cursor cursor, String columnName) {
166        return cursor.getInt(cursor.getColumnIndex(columnName));
167    }
168}
169