File uri to base64. - Android File Input Output

Android examples for File Input Output:Base64

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Description

File uri to base64.

Demo Code

/*// w w w  . j a v a 2 s  .  c  o  m
 * OpenERP, Open Source Management Solution
 * Copyright (C) 2012-today OpenERP SA (<http://www.openerp.com>)
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 * 
 */
//package com.java2s;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.content.ContentResolver;

import android.net.Uri;
import android.util.Base64;

public class Main {
    /**
     * File uri to base64.
     * 
     * @param uri
     *            the uri
     * @param resolver
     *            the resolver
     * @return the string
     */
    public static String fileUriToBase64(Uri uri, ContentResolver resolver) {
        String encodedBase64 = "";
        try {
            byte[] bytes = readBytes(uri, resolver);
            encodedBase64 = Base64.encodeToString(bytes, 0);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return encodedBase64;
    }

    /**
     * Read bytes.
     * 
     * @param uri
     *            the uri
     * @param resolver
     *            the resolver
     * @return the byte[]
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     */
    private static byte[] readBytes(Uri uri, ContentResolver resolver)
            throws IOException {
        // this dynamically extends to take the bytes you read
        InputStream inputStream = resolver.openInputStream(uri);
        ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();

        // this is storage overwritten on each iteration with bytes
        int bufferSize = 1024;
        byte[] buffer = new byte[bufferSize];

        // we need to know how may bytes were read to write them to the
        // byteBuffer
        int len = 0;
        while ((len = inputStream.read(buffer)) != -1) {
            byteBuffer.write(buffer, 0, len);
        }

        // and then we can return your byte array.
        return byteBuffer.toByteArray();
    }
}

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