Android开发之多媒体文件获取工具类实例

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;

public class MediaStoreUtil {
  private static final String TAG = "MediaStoreUtil";
  
  public static List getAudionames(Context context) {
    List list = new ArrayList();
    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;
  }
  
  public static List getImageNames(Context context) {
    List list = new ArrayList();
    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;
  }
  
  public static List getImages(Context context) {
    List list = new ArrayList();
    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;
  }
  
  public static List getAllFiles(Context context) {
    List list = new ArrayList();
    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;
  }
  
  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;
  }
  
  public static List getThumbNames(Context context) {
    List list = new ArrayList();
    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;
  }
  
  public static ArrayList 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 videoList = new ArrayList();
    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。