Java tutorial
//package com.java2s; /* CanvasDrawUtils.java Copyright (c) 2015 NTT DOCOMO,INC. Released under the MIT license http://opensource.org/licenses/mit-license.php */ import android.content.ContentResolver; import android.content.Context; import android.net.Uri; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; public class Main { /** * Defined a size of buffer. */ private static final int BUF_SIZE = 4096; /** * Gets binary from uri. * * @param context context * @param uri uri * @return byte[] or null on error */ public static byte[] getContentData(final Context context, final String uri) { if (uri == null) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); InputStream in = null; byte[] buf = new byte[BUF_SIZE]; int len; try { ContentResolver r = context.getContentResolver(); in = r.openInputStream(Uri.parse(uri)); while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } return out.toByteArray(); } catch (IOException e) { return null; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } }