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AssetProvider.java

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.actionbarcompat.shareactionprovider.content;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.database.Cursor;
import android.net.Uri;
import android.text.TextUtils;

import java.io.FileNotFoundException;
import java.io.IOException;

/**
 * A simple ContentProvider which can serve files from this application's assets. The majority of
 * functionality is in {@link #openAssetFile(android.net.Uri, String)}.
 */
public class AssetProvider extends ContentProvider {

public static String CONTENT_URI = "com.example.android.actionbarcompat.shareactionprovider";

@Override
    public boolean onCreate() {
        return true;
    }

@Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        // Do not support delete requests.
        return 0;
    }

@Override
    public String getType(Uri uri) {
        // Do not support returning the data type
        return null;
    }

@Override
    public Uri insert(Uri uri, ContentValues values) {
        // Do not support insert requests.
        return null;
    }

@Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
            String sortOrder) {
        // Do not support query requests.
        return null;
    }

@Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        // Do not support update requests.
        return 0;
    }

@Override
    public AssetFileDescriptor openAssetFile(Uri uri, String mode) throws FileNotFoundException {
        // The asset file name should be the last path segment
        final String assetName = uri.getLastPathSegment();

// If the given asset name is empty, throw an exception
        if (TextUtils.isEmpty(assetName)) {
            throw new FileNotFoundException();
        }

try {
            // Try and return a file descriptor for the given asset name
            AssetManager am = getContext().getAssets();
            return am.openFd(assetName);
        } catch (IOException e) {
            e.printStackTrace();
            return super.openAssetFile(uri, mode);
        }
    }
}