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