 
/** 
* Insert an image and create a thumbnail for it. 
* 
* @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 <code>null</code> if the image failed to be stored 
* for any reason. 
*/ 
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.DESCRIPTION, description); 
values.put(Images.Media.MIME_TYPE, "image/jpeg"); 
Uri url = null; 
String stringUrl = null; /* value to be returned */ 
try { 
url = cr.insert(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. 
Bitmap microThumb = StoreThumbnail(cr, miniThumb, id, 50F, 50F, 
Images.Thumbnails.MICRO_KIND); 
} else { 
Log.e(TAG, "Failed to create thumbnail, removing original"); 
cr.delete(url, null, null); 
url = null; 
} 
} catch (Exception e) { 
Log.e(TAG, "Failed to insert image", e); 
if (url != null) { 
cr.delete(url, null, null); 
url = null; 
} 
} 
if (url != null) { 
stringUrl = url.toString(); 
} 
return stringUrl; 
} 

上面方法里面有一個title，我剛以為是可以設置圖片的名字，設置一下，原來不是，郁悶，哪位高手知道title這個字段是干嘛的，告訴下小弟，不勝感激！
當然Android還提供了一個插入系統(tǒng)相冊的方法，可以指定保存圖片的名字，我把源碼貼出來吧

復制代碼代碼如下:

 
/** 
* 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 final 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) { 
} 
} 
} 

啊啊，貼完源碼我才發(fā)現(xiàn)，這個方法調用了第一個方法，這個name就是上面方法的title，暈死，這下更加郁悶了，反正我設置title無效果，求高手為小弟解答，先不管了，我們繼續(xù)往下說
上面那段代碼插入到系統(tǒng)相冊之后還需要發(fā)條廣播

復制代碼代碼如下:

 
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory()))); 

上面那條廣播是掃描整個sd卡的廣播，如果你sd卡里面東西很多會掃描很久，在掃描當中我們是不能訪問sd卡，所以這樣子用戶體現(xiàn)很不好，用過微信的朋友都知道，微信保存圖片到系統(tǒng)相冊并沒有掃描整個SD卡，所以我們用到下面的方法

復制代碼代碼如下:

 
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); 
Uri uri = Uri.fromFile(new File("/sdcard/image.jpg")); 
intent.setData(uri); 
mContext.sendBroadcast(intent); 

或者用MediaScannerConnection

復制代碼代碼如下:

 
final MediaScannerConnection msc = new MediaScannerConnection(mContext, new MediaScannerConnectionClient() { 
public void onMediaScannerConnected() { 
msc.scanFile("/sdcard/image.jpg", "image/jpeg"); 
} 
public void onScanCompleted(String path, Uri uri) { 
Log.v(TAG, "scan completed"); 
msc.disconnect(); 
} 
}); 

也行你會問我，怎么獲取到我們剛剛插入的圖片的路徑？呵呵，這個自有方法獲取，insertImage(ContentResolver cr, Bitmap source,String title, String description)，這個方法給我們返回的就是插入圖片的Uri,我們根據(jù)這個Uri就能獲取到圖片的絕對路徑

復制代碼代碼如下:

 
private String getFilePathByContentResolver(Context context, Uri uri) { 
if (null == uri) { 
return null; 
} 
Cursor c = context.getContentResolver().query(uri, null, null, null, null); 
String filePath = null; 
if (null == c) { 
throw new IllegalArgumentException( 
"Query on " + uri + " returns null result."); 
} 
try { 
if ((c.getCount() != 1) || !c.moveToFirst()) { 
} else { 
filePath = c.getString( 
c.getColumnIndexOrThrow(MediaColumns.DATA)); 
} 
} finally { 
c.close(); 
} 
return filePath; 
} 