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ActionBarCompat-ShareActionProvider / src / com.example.android.actionbarcompat.shareactionprovider / content /

AssetProvider.java

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/*
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 * Copyright (C) 2013 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.actionbarcompat.shareactionprovider.content;
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import android.content.ContentProvider;
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import android.content.ContentValues;
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import android.content.res.AssetFileDescriptor;
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import android.content.res.AssetManager;
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import android.database.Cursor;
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import android.net.Uri;
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import android.text.TextUtils;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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/**
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 * A simple ContentProvider which can serve files from this application's assets. The majority of
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 * functionality is in {@link #openAssetFile(android.net.Uri, String)}.
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 */
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public class AssetProvider extends ContentProvider {
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    public static String CONTENT_URI = "com.example.android.actionbarcompat.shareactionprovider";
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    @Override
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    public boolean onCreate() {
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        return true;
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    }
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    @Override
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    public int delete(Uri uri, String selection, String[] selectionArgs) {
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        // Do not support delete requests.
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        return 0;
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    }
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    @Override
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    public String getType(Uri uri) {
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        // Do not support returning the data type
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        return null;
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    }
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    @Override
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    public Uri insert(Uri uri, ContentValues values) {
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        // Do not support insert requests.
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        return null;
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    }
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    @Override
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    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
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            String sortOrder) {
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        // Do not support query requests.
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        return null;
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    }
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    @Override
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    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
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        // Do not support update requests.
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        return 0;
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    }
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    @Override
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    public AssetFileDescriptor openAssetFile(Uri uri, String mode) throws FileNotFoundException {
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        // The asset file name should be the last path segment
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        final String assetName = uri.getLastPathSegment();
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        // If the given asset name is empty, throw an exception
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        if (TextUtils.isEmpty(assetName)) {
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            throw new FileNotFoundException();
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        }
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        try {
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            // Try and return a file descriptor for the given asset name
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            AssetManager am = getContext().getAssets();
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            return am.openFd(assetName);
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        } catch (IOException e) {
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            e.printStackTrace();
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            return super.openAssetFile(uri, mode);
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        }
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    }
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}
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