发布于 2016-02-22 10:28:41 | 119 次阅读 | 评论: 0 | 来源: 网友投递
Android移动端操作系统
Android是一种基于Linux的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由Google公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用“安卓”或“安致”。
如何判断文件呢? 可以通过Cursor遍历数据库,对比INTERNAL_CONTENT_URI字段的值,这是一个Uri,这里保存着Android手机SD卡上的多媒体文件完整路径。
[java]
Uri originalUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
//若为视频则为MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
ContentResolver cr = this.getContentResolver();
Cursor cursor = cr.query(originalUri, null, null, null, null);
if (cursor == null) {
return;
}
for (cursor.moveToFirst();!cursor.isAfterLast(); cursor.moveToNext()) {
long thumbNailsId = cursor.getLong(cursor .getColumnIndex("_ID"));
Bitmap bitmap = MediaStore.Images.Thumbnails.getThumbnail(cr,
thumbNailsId, Video.Thumbnails.MICRO_KIND, null);
//若为视频则为
// Bitmap bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr,
// thumbNailsId, Video.Thumbnails.MICRO_KIND, null);
return bitmap;
}
Uri originalUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
//若为视频则为MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
ContentResolver cr = this.getContentResolver();
Cursor cursor = cr.query(originalUri, null, null, null, null);
if (cursor == null) {
return;
}
for (cursor.moveToFirst();!cursor.isAfterLast(); cursor.moveToNext()) {
long thumbNailsId = cursor.getLong(cursor .getColumnIndex("_ID"));
Bitmap bitmap = MediaStore.Images.Thumbnails.getThumbnail(cr,
thumbNailsId, Video.Thumbnails.MICRO_KIND, null);
//若为视频则为
// Bitmap bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr,
// thumbNailsId, Video.Thumbnails.MICRO_KIND, null);
return bitmap;
}