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 }