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。
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