Android example source code file (DataLoader.java)

This example Android source code file (DataLoader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, bytearrayinputstream, dataloader, http, internet, io, loadlistener, net, network, ok, override, streamloader, string

The DataLoader.java Android example source code

/*
 * Copyright (C) 2007 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 android.webkit;

import android.net.http.EventHandler;

import com.android.internal.R;

import java.io.ByteArrayInputStream;

import org.apache.harmony.luni.util.Base64;

/**
 * This class is a concrete implementation of StreamLoader that uses the
 * content supplied as a URL as the source for the stream. The mimetype
 * optionally provided in the URL is extracted and inserted into the HTTP
 * response headers.
 */
class DataLoader extends StreamLoader {

    /**
     * Constructor uses the dataURL as the source for an InputStream
     * @param dataUrl data: URL string optionally containing a mimetype
     * @param loadListener LoadListener to pass the content to
     */
    DataLoader(String dataUrl, LoadListener loadListener) {
        super(loadListener);

        String url = dataUrl.substring("data:".length());
        byte[] data = null;
        int commaIndex = url.indexOf(',');
        if (commaIndex != -1) {
            String contentType = url.substring(0, commaIndex);
            data = url.substring(commaIndex + 1).getBytes();
            loadListener.parseContentTypeHeader(contentType);
            if ("base64".equals(loadListener.transferEncoding())) {
                data = Base64.decode(data);
            }
        } else {
            data = url.getBytes();
        }
        if (data != null) {
            mDataStream = new ByteArrayInputStream(data);
            mContentLength = data.length;
        }
    }

    @Override
    protected boolean setupStreamAndSendStatus() {
        if (mDataStream != null) {
            mLoadListener.status(1, 1, 200, "OK");
            return true;
        } else {
            mLoadListener.error(EventHandler.ERROR,
                    mContext.getString(R.string.httpError));
            return false;
        }
    }

    @Override
    protected void buildHeaders(android.net.http.Headers h) {
    }
}