Android example source code file (MediaFile.java)

This example Android source code file (MediaFile.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, content, file_type_3gpp, file_type_aac, file_type_asf, file_type_imy, file_type_jpeg, file_type_mid, file_type_mp3, file_type_mp4, file_type_ogg, file_type_wbmp, file_type_wpl, hashmap, media, mediafiletype, photo, sound, string, util

The MediaFile.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.media;

import android.content.ContentValues;
import android.provider.MediaStore.Audio;
import android.provider.MediaStore.Images;
import android.provider.MediaStore.Video;
import android.media.DecoderCapabilities;
import android.media.DecoderCapabilities.VideoDecoder;
import android.media.DecoderCapabilities.AudioDecoder;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

/**
 * MediaScanner helper class.
 *
 * {@hide}
 */
public class MediaFile {
    // comma separated list of all file extensions supported by the media scanner
    public final static String sFileExtensions;

    // Audio file types
    public static final int FILE_TYPE_MP3     = 1;
    public static final int FILE_TYPE_M4A     = 2;
    public static final int FILE_TYPE_WAV     = 3;
    public static final int FILE_TYPE_AMR     = 4;
    public static final int FILE_TYPE_AWB     = 5;
    public static final int FILE_TYPE_WMA     = 6;
    public static final int FILE_TYPE_OGG     = 7;
    public static final int FILE_TYPE_AAC     = 8;
    private static final int FIRST_AUDIO_FILE_TYPE = FILE_TYPE_MP3;
    private static final int LAST_AUDIO_FILE_TYPE = FILE_TYPE_AAC;

    // MIDI file types
    public static final int FILE_TYPE_MID     = 11;
    public static final int FILE_TYPE_SMF     = 12;
    public static final int FILE_TYPE_IMY     = 13;
    private static final int FIRST_MIDI_FILE_TYPE = FILE_TYPE_MID;
    private static final int LAST_MIDI_FILE_TYPE = FILE_TYPE_IMY;
   
    // Video file types
    public static final int FILE_TYPE_MP4     = 21;
    public static final int FILE_TYPE_M4V     = 22;
    public static final int FILE_TYPE_3GPP    = 23;
    public static final int FILE_TYPE_3GPP2   = 24;
    public static final int FILE_TYPE_WMV     = 25;
    public static final int FILE_TYPE_ASF     = 26;
    private static final int FIRST_VIDEO_FILE_TYPE = FILE_TYPE_MP4;
    private static final int LAST_VIDEO_FILE_TYPE = FILE_TYPE_ASF;
    
    // Image file types
    public static final int FILE_TYPE_JPEG    = 31;
    public static final int FILE_TYPE_GIF     = 32;
    public static final int FILE_TYPE_PNG     = 33;
    public static final int FILE_TYPE_BMP     = 34;
    public static final int FILE_TYPE_WBMP    = 35;
    private static final int FIRST_IMAGE_FILE_TYPE = FILE_TYPE_JPEG;
    private static final int LAST_IMAGE_FILE_TYPE = FILE_TYPE_WBMP;
   
    // Playlist file types
    public static final int FILE_TYPE_M3U     = 41;
    public static final int FILE_TYPE_PLS     = 42;
    public static final int FILE_TYPE_WPL     = 43;
    private static final int FIRST_PLAYLIST_FILE_TYPE = FILE_TYPE_M3U;
    private static final int LAST_PLAYLIST_FILE_TYPE = FILE_TYPE_WPL;
    
    static class MediaFileType {
    
        int fileType;
        String mimeType;
        
        MediaFileType(int fileType, String mimeType) {
            this.fileType = fileType;
            this.mimeType = mimeType;
        }
    }
    
    private static HashMap<String, MediaFileType> sFileTypeMap 
            = new HashMap<String, MediaFileType>();
    private static HashMap<String, Integer> sMimeTypeMap 
            = new HashMap<String, Integer>();            
    static void addFileType(String extension, int fileType, String mimeType) {
        sFileTypeMap.put(extension, new MediaFileType(fileType, mimeType));
        sMimeTypeMap.put(mimeType, Integer.valueOf(fileType));
    }

    private static boolean isWMAEnabled() {
        List<AudioDecoder> decoders = DecoderCapabilities.getAudioDecoders();
        for (AudioDecoder decoder: decoders) {
            if (decoder == AudioDecoder.AUDIO_DECODER_WMA) {
                return true;
            }
        }
        return false;
    }

    private static boolean isWMVEnabled() {
        List<VideoDecoder> decoders = DecoderCapabilities.getVideoDecoders();
        for (VideoDecoder decoder: decoders) {
            if (decoder == VideoDecoder.VIDEO_DECODER_WMV) {
                return true;
            }
        }
        return false;
    }

    static {
        addFileType("MP3", FILE_TYPE_MP3, "audio/mpeg");
        addFileType("M4A", FILE_TYPE_M4A, "audio/mp4");
        addFileType("WAV", FILE_TYPE_WAV, "audio/x-wav");
        addFileType("AMR", FILE_TYPE_AMR, "audio/amr");
        addFileType("AWB", FILE_TYPE_AWB, "audio/amr-wb");
        if (isWMAEnabled()) {
            addFileType("WMA", FILE_TYPE_WMA, "audio/x-ms-wma");
        }
        addFileType("OGG", FILE_TYPE_OGG, "application/ogg");
        addFileType("OGA", FILE_TYPE_OGG, "application/ogg");
        addFileType("AAC", FILE_TYPE_AAC, "audio/aac");
 
        addFileType("MID", FILE_TYPE_MID, "audio/midi");
        addFileType("MIDI", FILE_TYPE_MID, "audio/midi");
        addFileType("XMF", FILE_TYPE_MID, "audio/midi");
        addFileType("RTTTL", FILE_TYPE_MID, "audio/midi");
        addFileType("SMF", FILE_TYPE_SMF, "audio/sp-midi");
        addFileType("IMY", FILE_TYPE_IMY, "audio/imelody");
        addFileType("RTX", FILE_TYPE_MID, "audio/midi");
        addFileType("OTA", FILE_TYPE_MID, "audio/midi");
        
        addFileType("MPEG", FILE_TYPE_MP4, "video/mpeg");
        addFileType("MP4", FILE_TYPE_MP4, "video/mp4");
        addFileType("M4V", FILE_TYPE_M4V, "video/mp4");
        addFileType("3GP", FILE_TYPE_3GPP, "video/3gpp");
        addFileType("3GPP", FILE_TYPE_3GPP, "video/3gpp");
        addFileType("3G2", FILE_TYPE_3GPP2, "video/3gpp2");
        addFileType("3GPP2", FILE_TYPE_3GPP2, "video/3gpp2");
        if (isWMVEnabled()) {
            addFileType("WMV", FILE_TYPE_WMV, "video/x-ms-wmv");
            addFileType("ASF", FILE_TYPE_ASF, "video/x-ms-asf");
        }

        addFileType("JPG", FILE_TYPE_JPEG, "image/jpeg");
        addFileType("JPEG", FILE_TYPE_JPEG, "image/jpeg");
        addFileType("GIF", FILE_TYPE_GIF, "image/gif");
        addFileType("PNG", FILE_TYPE_PNG, "image/png");
        addFileType("BMP", FILE_TYPE_BMP, "image/x-ms-bmp");
        addFileType("WBMP", FILE_TYPE_WBMP, "image/vnd.wap.wbmp");
 
        addFileType("M3U", FILE_TYPE_M3U, "audio/x-mpegurl");
        addFileType("PLS", FILE_TYPE_PLS, "audio/x-scpls");
        addFileType("WPL", FILE_TYPE_WPL, "application/vnd.ms-wpl");

        // compute file extensions list for native Media Scanner
        StringBuilder builder = new StringBuilder();
        Iterator<String> iterator = sFileTypeMap.keySet().iterator();
        
        while (iterator.hasNext()) {
            if (builder.length() > 0) {
                builder.append(',');
            }
            builder.append(iterator.next());
        } 
        sFileExtensions = builder.toString();
    }
    
    public static boolean isAudioFileType(int fileType) {
        return ((fileType >= FIRST_AUDIO_FILE_TYPE &&
                fileType <= LAST_AUDIO_FILE_TYPE) ||
                (fileType >= FIRST_MIDI_FILE_TYPE &&
                fileType <= LAST_MIDI_FILE_TYPE));
    }
    
    public static boolean isVideoFileType(int fileType) {
        return (fileType >= FIRST_VIDEO_FILE_TYPE &&
                fileType <= LAST_VIDEO_FILE_TYPE);
    }
    
    public static boolean isImageFileType(int fileType) {
        return (fileType >= FIRST_IMAGE_FILE_TYPE &&
                fileType <= LAST_IMAGE_FILE_TYPE);
    }
    
    public static boolean isPlayListFileType(int fileType) {
        return (fileType >= FIRST_PLAYLIST_FILE_TYPE &&
                fileType <= LAST_PLAYLIST_FILE_TYPE);
    }
    
    public static MediaFileType getFileType(String path) {
        int lastDot = path.lastIndexOf(".");
        if (lastDot < 0)
            return null;
        return sFileTypeMap.get(path.substring(lastDot + 1).toUpperCase());
    }
    
    public static int getFileTypeForMimeType(String mimeType) {
        Integer value = sMimeTypeMap.get(mimeType);
        return (value == null ? 0 : value.intValue());
    }

}