Android开发之多媒体文件获取工具类实例【音频,视频,图片等】

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。