/**
* 获取图片缩略图
*
* @param dbId
* @return
*/
public MediaThumbnail getImageThumbnail(int dbId) {
String volumeName = "external";
String selection = Images.Thumbnails.IMAGE_ID + "='" + dbId + "'";
String[] columns =
new String[] {Images.Thumbnails.DATA, Images.Thumbnails.WIDTH, Images.Thumbnails.HEIGHT};
Uri uri = Images.Thumbnails.getContentUri(volumeName);
Cursor cur = null;
try {
cur = mContext.getContentResolver().query(uri, columns, selection, null, null);
if (null == cur) {
return null;
}
if (!cur.moveToFirst()) {
return null;
}
MediaThumbnail thumbnail = new MediaThumbnail();
thumbnail.path = MediaDbUtil.getString(cur, Images.Thumbnails.DATA);
thumbnail.width = MediaDbUtil.getInt(cur, Images.Thumbnails.WIDTH);
thumbnail.height = MediaDbUtil.getInt(cur, Images.Thumbnails.HEIGHT);
thumbnail.dbId = dbId;
thumbnail.type = MediaThumbnail.TYPE_IMAGE;
return thumbnail;
} finally {
if (cur != null) {
cur.close();
}
}
}
public static Thumbnail getLastThumbnail(ContentResolver resolver, boolean isImage) {
/*
* Media image = getLastImageThumbnail(resolver); Media video =
* getLastVideoThumbnail(resolver); Log.e("testthum",
* "get last thumbnail called"); if (image == null && video == null)
* return null; if (video == null) Log.e("testthum", "video is null");
* Bitmap bitmap = null; Media lastMedia; // If there is only image or
* video, get its thumbnail. If both exist, // get the thumbnail of the
* one that is newer. if (image != null && (video == null ||
* image.dateTaken >= video.dateTaken)) { Log.e("testthum",
* "get thumbnail image"); bitmap =
* Images.Thumbnails.getThumbnail(resolver, image.id,
* Images.Thumbnails.MINI_KIND, null); lastMedia = image; } else {
* Log.e("testthum", "get thumbnail video"); bitmap =
* Video.Thumbnails.getThumbnail(resolver, video.id,
* Video.Thumbnails.MINI_KIND, null); lastMedia = video; }
*/
Media media = isImage ? getLastImageThumbnail(resolver) : getLastVideoThumbnail(resolver);
if (media == null) {
Log.d("dyb", "media is null");
return null;
}
Bitmap bitmap = null;
// If there is only image or video, get its thumbnail. If both exist,
// get the thumbnail of the one that is newer.
if (isImage) {
File dir = new File(Storage.DIRECTORY);
dir.mkdir();
if (!dir.isDirectory() || !dir.canWrite()) {
Log.d("dyb", "dir error");
return null;
}
if (dir.listFiles().length == 0) {
Log.d("mk", "dir.listFiles().length = " + dir.listFiles().length);
return null;
}
bitmap =
Images.Thumbnails.getThumbnail(resolver, media.id, Images.Thumbnails.MINI_KIND, null);
} else {
File dir = new File(Storage.DIRECTORY);
dir.mkdir();
if (!dir.isDirectory() || !dir.canWrite()) {
Log.d("dyb", "dir error");
return null;
}
if (dir.listFiles().length == 0) {
Log.d("mk", "dir.listFiles().length = " + dir.listFiles().length);
return null;
}
bitmap = Video.Thumbnails.getThumbnail(resolver, media.id, Video.Thumbnails.MINI_KIND, null);
}
// Ensure database and storage are in sync.
if (Util.isUriValid(media.uri, resolver)) {
return createThumbnail(media.uri, bitmap, media.orientation);
}
return null;
}
/**
* A copy of the Android internals insertImage method, this method populates the meta data with
* DATE_ADDED and DATE_TAKEN. This fixes a common problem where media that is inserted manually
* gets saved at the end of the gallery (because date is not populated).
*
* @see android.provider.MediaStore.Images.Media#insertImage(ContentResolver, Bitmap, String,
* String)
*/
public static final String insertImage(
ContentResolver cr, Bitmap source, String title, String description) {
ContentValues values = new ContentValues();
values.put(Images.Media.TITLE, title);
values.put(Images.Media.DISPLAY_NAME, title);
values.put(Images.Media.DESCRIPTION, description);
values.put(Images.Media.MIME_TYPE, "image/jpeg");
// Add the date meta data to ensure the image is added at the front of the gallery
values.put(Images.Media.DATE_ADDED, System.currentTimeMillis());
values.put(Images.Media.DATE_TAKEN, System.currentTimeMillis());
Uri url = null;
String stringUrl = null; /* value to be returned */
try {
url = cr.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
if (source != null) {
OutputStream imageOut = cr.openOutputStream(url);
try {
source.compress(Bitmap.CompressFormat.JPEG, 50, imageOut);
} finally {
imageOut.close();
}
long id = ContentUris.parseId(url);
// Wait until MINI_KIND thumbnail is generated.
Bitmap miniThumb =
Images.Thumbnails.getThumbnail(cr, id, Images.Thumbnails.MINI_KIND, null);
// This is for backward compatibility.
storeThumbnail(cr, miniThumb, id, 50F, 50F, Images.Thumbnails.MICRO_KIND);
} else {
cr.delete(url, null, null);
url = null;
}
} catch (Exception e) {
if (url != null) {
cr.delete(url, null, null);
url = null;
}
}
if (url != null) {
stringUrl = url.toString();
}
return stringUrl;
}