本文实例讲述了Android开发之多媒体文件获取工具类。分享给大家供大家参考，具体如下：
package com.android.ocr.util; import java.io.File; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.database.Cursor; import android.graphics.Bitmap; import android.provider.MediaStore; /** * 根据MediaStore查询信息 * @Project App_ReadCard * @Package com.android.ocr.util * @author chenlin * @version 1.0 * @Date 2013年6月16日 * @Note TODO */ public class MediaStoreUtil { private static final String TAG = "MediaStoreUtil"; /** * 查询音频文件名称 * * @param context * @return */ public static List<String> getAudioNames(Context context) { List<String> list = new ArrayList<String>(); Cursor cursor = context.getContentResolver().query( MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Audio.Media._ID, MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.YEAR, MediaStore.Audio.Media.MIME_TYPE, MediaStore.Audio.Media.SIZE, MediaStore.Audio.Media.DATA }, null, new String[] {}, null); while (cursor.moveToNext()) { String fileName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)); list.add(fileName); } return list; } /** * 查询图片文件名称 * * @param context * @return */ public static List<String> getImageNames(Context context) { List<String> list = new ArrayList<String>(); Cursor cursor = context.getContentResolver().query( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Images.Media._ID, MediaStore.Images.Media.DISPLAY_NAME, MediaStore.Images.Media.TITLE, MediaStore.Images.Media.MIME_TYPE, MediaStore.Images.Media.SIZE, MediaStore.Images.Media.DATA }, null, new String[] {}, null); while (cursor.moveToNext()) { Logger.i(TAG, "filePath==" + MediaStore.Images.Media.DATA); String filePath = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); String fileName = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME)); list.add(filePath + "/" + fileName); } return list; } /** * 查询图片文件 * * @param context * @return */ public static List<File> getImages(Context context) { List<File> list = new ArrayList<File>(); Cursor cursor = context.getContentResolver().query( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Images.Media._ID, MediaStore.Images.Media.DISPLAY_NAME, MediaStore.Images.Media.TITLE, MediaStore.Images.Media.MIME_TYPE, MediaStore.Images.Media.SIZE, MediaStore.Images.Media.DATA }, null, new String[] {}, null); while (cursor.moveToNext()) { String filePath = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); Logger.i(TAG, "filePath==" + filePath); String fileName = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME)); //Logger.i(TAG, "fileName==" + fileName); File file = new File(filePath); list.add(file); } return list; } /** * 查询文件 * * @param context * @return */ public static List<File> getAllFiles(Context context) { List<File> list = new ArrayList<File>(); Cursor cursor = context.getContentResolver().query( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Images.Media._ID, MediaStore.Images.Media.DISPLAY_NAME, MediaStore.Images.Media.TITLE, MediaStore.Images.Media.MIME_TYPE, MediaStore.Images.Media.SIZE, MediaStore.Images.Media.DATA }, null, new String[] {}, null); while (cursor.moveToNext()) { String filePath = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); Logger.i(TAG, "filePath==" + filePath); String fileName = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME)); //Logger.i(TAG, "fileName==" + fileName); File file = new File(filePath); list.add(file); } return list; } /** * 获取所有的缩列图 * * @param context * @return */ public static Bitmap[] getBitmaps(Context context) { Bitmap[] bitmaps; String[] projection = { MediaStore.Images.Media._ID, MediaStore.Images.Media.DATA }; Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, null, null, MediaStore.Images.Media._ID); int count = cursor.getCount(); int image_column_index = cursor.getColumnIndex(MediaStore.Images.Media._ID); bitmaps = new Bitmap[count]; for (int i = 0; i < count; i++) { cursor.moveToPosition(i); int id = cursor.getInt(image_column_index); bitmaps[i] = MediaStore.Images.Thumbnails.getThumbnail(context.getContentResolver(), id, MediaStore.Images.Thumbnails.MICRO_KIND, null); } return bitmaps; } /** * 查询图片缩列文件名称 * * @param context * @return */ public static List<String> getThumbNames(Context context) { List<String> list = new ArrayList<String>(); Cursor cursor = context.getContentResolver().query( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Images.Thumbnails._ID, MediaStore.Images.Thumbnails.DATA, MediaStore.Images.Thumbnails.KIND, MediaStore.Images.Thumbnails.IMAGE_ID }, null, new String[] {}, null); while (cursor.moveToNext()) { String fileName = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME)); list.add(fileName); } return list; } /** * 获得所有视频文件 * @param context */ public static ArrayList<VideoInfo> getVideoInfo(Context context){ String[] thumbColumns = new String[]{ MediaStore.Video.Thumbnails.DATA, MediaStore.Video.Thumbnails.VIDEO_ID }; String[] mediaColumns = new String[]{ MediaStore.Video.Media.DATA, MediaStore.Video.Media._ID, MediaStore.Video.Media.TITLE, MediaStore.Video.Media.MIME_TYPE }; //首先检索SDcard上所有的video Cursor cursor = context.getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, mediaColumns, null, null, null); ArrayList<VideoInfo> videoList = new ArrayList<VideoInfo>(); if(cursor.moveToFirst()){ do{ VideoInfo info = new VideoInfo(); info.filePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA)); info.mimeType = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE)); info.title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE)); //获取当前Video对应的Id，然后根据该ID获取其Thumb int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID)); String selection = MediaStore.Video.Thumbnails.VIDEO_ID +"=?"; String[] selectionArgs = new String[]{ id+"" }; Cursor thumbCursor = context.getContentResolver().query(MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI, thumbColumns, selection, selectionArgs, null); if(thumbCursor.moveToFirst()){ info.thumbPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Thumbnails.DATA)); } //然后将其加入到videoList videoList.add(info); }while(cursor.moveToNext()); } return videoList; } static class VideoInfo{ String filePath; String mimeType; String thumbPath; String title; } }
更多关于Android相关内容感兴趣的读者可查看本站专题：《Android多媒体操作技巧汇总(音频,视频,录音等)》、《Android开发入门与进阶教程》、《Android视图View技巧总结》、《Android文件操作技巧汇总》、《Android资源操作技巧汇总》及《Android控件用法总结》
希望本文所述对大家Android程序设计有所帮助。