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 
17 package com.example.android.shareactionprovider.content;
18 
19 import android.content.ContentProvider;
20 import android.content.ContentValues;
21 import android.content.Context;
22 import android.content.res.AssetFileDescriptor;
23 import android.content.res.AssetManager;
24 import android.database.Cursor;
25 import android.net.Uri;
26 import android.support.annotation.NonNull;
27 import android.text.TextUtils;
28 
29 import java.io.FileNotFoundException;
30 import java.io.IOException;
31 
32 /**
33  * A simple ContentProvider which can serve files from this application's assets. The majority of
34  * functionality is in {@link #openAssetFile(android.net.Uri, String)}.
35  */
36 public class AssetProvider extends ContentProvider {
37 
38     public static String CONTENT_URI = "com.example.android.actionbarcompat.shareactionprovider";
39 
40     @Override
onCreate()41     public boolean onCreate() {
42         return true;
43     }
44 
45     @Override
delete(@onNull Uri uri, String selection, String[] selectionArgs)46     public int delete(@NonNull Uri uri, String selection, String[] selectionArgs) {
47         // Do not support delete requests.
48         return 0;
49     }
50 
51     @Override
getType(@onNull Uri uri)52     public String getType(@NonNull Uri uri) {
53         // Do not support returning the data type
54         return null;
55     }
56 
57     @Override
insert(@onNull Uri uri, ContentValues values)58     public Uri insert(@NonNull Uri uri, ContentValues values) {
59         // Do not support insert requests.
60         return null;
61     }
62 
63     @Override
query(@onNull Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)64     public Cursor query(@NonNull Uri uri, String[] projection, String selection,
65             String[] selectionArgs,
66             String sortOrder) {
67         // Do not support query requests.
68         return null;
69     }
70 
71     @Override
update(@onNull Uri uri, ContentValues values, String selection, String[] selectionArgs)72     public int update(@NonNull Uri uri, ContentValues values, String selection,
73             String[] selectionArgs) {
74         // Do not support update requests.
75         return 0;
76     }
77 
78     @Override
openAssetFile(@onNull Uri uri, @NonNull String mode)79     public AssetFileDescriptor openAssetFile(@NonNull Uri uri, @NonNull String mode)
80             throws FileNotFoundException {
81         // The asset file name should be the last path segment
82         final String assetName = uri.getLastPathSegment();
83 
84         // If the given asset name is empty, throw an exception
85         if (TextUtils.isEmpty(assetName)) {
86             throw new FileNotFoundException();
87         }
88 
89         try {
90             // Try and return a file descriptor for the given asset name
91             Context context = getContext();
92             if (context == null) {
93                 return super.openAssetFile(uri, mode);
94             }
95             AssetManager am = context.getAssets();
96             return am.openFd(assetName);
97         } catch (IOException e) {
98             e.printStackTrace();
99             return super.openAssetFile(uri, mode);
100         }
101     }
102 }
103