Android保存图片到相册

Android的Media就有保存图片到相册的方法
MediaStore.Images.Media.insertImage(ContentResolver cr, Bitmap source, String title, String description)

但在使用的过程中发现，这个方法保存的图片是没有时间信息的，导致在查看相册的时候也不能正常的按时间排序的顺序显示，

查看insertImage的源码，发现方法只写了三个参数

values.put(Images.Media.TITLE, title);

values.put(Images.Media.DESCRIPTION, description);

values.put(Images.Media.MIME_TYPE, "image/jpeg");

所以这里按源码重新写了一个保存图片的方法

/**
* Insert an image and create a thumbnail for it.
*
* @param cr The content resolver to use
* @param imagePath The path to the image to insert
* @param name The name of the image
* @param description The description of the image
* @return The URL to the newly created image
* @throws FileNotFoundException
*/
public static String insertImage(ContentResolver cr, String imagePath,
String name, String description) throws FileNotFoundException {
// Check if file exists with a FileInputStream
FileInputStream stream = new FileInputStream(imagePath);
try {
Bitmap bm = BitmapFactory.decodeFile(imagePath);
String ret = insertImage(cr, bm, name, description);
bm.recycle();
return ret;
} finally {
try {
stream.close();
} catch (IOException e) {
}
}
}

/**
* Insert an image and create a thumbnail for it.
* jliu : 对源码作过修改，加入了时间信息，默认插入时间为当前时间
* @param cr The content resolver to use
* @param source The stream to use for the image
* @param title The name of the image
* @param description The description of the image
* @return The URL to the newly created image, or null if the image failed to be stored
* for any reason.
*/
public static String insertImage(ContentResolver cr, Bitmap source,
String title, String description) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, title);
values.put(MediaStore.Images.Media.DESCRIPTION, description);
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis()); // 添加时间信息
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
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 = MediaStore.Images.Thumbnails.getThumbnail(cr, id,
MediaStore.Images.Thumbnails.MINI_KIND, null);
// This is for backward compatibility.
StoreThumbnail(cr, miniThumb, id, 50F, 50F,
MediaStore.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;

}

/**

* 生成预览图信息

private static Bitmap StoreThumbnail(
ContentResolver cr,
Bitmap source,
long id,
float width, float height,
int kind) {
// create the matrix to scale it
Matrix matrix = new Matrix();

float scaleX = width / source.getWidth();
float scaleY = height / source.getHeight();
matrix.setScale(scaleX, scaleY);
Bitmap thumb = Bitmap.createBitmap(source, 0, 0,
source.getWidth(),
source.getHeight(), matrix,
true);
ContentValues values = new ContentValues(4);
values.put(MediaStore.Images.Thumbnails.KIND, kind);
values.put(MediaStore.Images.Thumbnails.IMAGE_ID, (int)id);
values.put(MediaStore.Images.Thumbnails.HEIGHT, thumb.getHeight());
values.put(MediaStore.Images.Thumbnails.WIDTH, thumb.getWidth());
Uri url = cr.insert(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, values);
try {
OutputStream thumbOut = cr.openOutputStream(url);
thumb.compress(Bitmap.CompressFormat.JPEG, 100, thumbOut);
thumbOut.close();
return thumb;
}
catch (FileNotFoundException ex) {
return null;
}
catch (IOException ex) {
return null;
}
}

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