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      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
     41     public boolean onCreate() {
     42         return true;
     43     }
     44 
     45     @Override
     46     public int delete(@NonNull Uri uri, String selection, String[] selectionArgs) {
     47         // Do not support delete requests.
     48         return 0;
     49     }
     50 
     51     @Override
     52     public String getType(@NonNull Uri uri) {
     53         // Do not support returning the data type
     54         return null;
     55     }
     56 
     57     @Override
     58     public Uri insert(@NonNull Uri uri, ContentValues values) {
     59         // Do not support insert requests.
     60         return null;
     61     }
     62 
     63     @Override
     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
     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
     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