解决Android拍照保存在系统相册不显示的问题

可能大家都知道我们保存相册到Android手机的时候,然后去打开系统图库找不到我们想要的那张图片,那是因为我们插入的图片还没有更新的缘故,先讲解下插入系统图库的方法吧,很简单,一句代码就能实现

 

MediaStore.Images.Media.insertImage(getContentResolver(), mBitmap, "", "");

通过上面的那句代码就能插入到系统图库,这时候有一个问题,就是我们不能指定插入照片的名字,而是系统给了我们一个当前时间的毫秒数为名字,有一个问题郁闷了很久,我还是先把insertImage的源码贴出来吧

 

 

 /**

             * 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;

            }

上面方法里面有一个title,我刚以为是可以设置图片的名字,设置一下,原来不是,郁闷,哪位高手知道title这个字段是干嘛的,告诉下小弟,不胜感激!

 

当然Android还提供了一个插入系统相册的方法,可以指定保存图片的名字,我把源码贴出来吧

 

   /**

             * 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,贴完源码我才发现,这个方法调用了第一个方法,这个name就是上面方法的title,晕死,这下更加郁闷了,反正我设置title无效果,求高手为小弟解答,先不管了,我们继续往下说

 

上面那段代码插入到系统相册之后还需要发条广播

 

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

上面那条广播是扫描整个sd卡的广播,如果你sd卡里面东西很多会扫描很久,在扫描当中我们是不能访问sd卡,所以这样子用户体现很不好,用过微信的朋友都知道,微信保存图片到系统相册并没有扫描整个SD卡,所以我们用到下面的方法

 

 

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

 

 

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();   

  }   

 });   

也行你会问我,怎么获取到我们刚刚插入的图片的路径?呵呵,这个自有方法获取,insertImage(ContentResolver cr, Bitmap source,String title, String description),这个方法给我们返回的就是插入图片的Uri,我们根据这个Uri就能获取到图片的绝对路径

 

 

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;

    }

根据上面的那个方法获取到的就是图片的绝对路径,这样子我们就不用发送扫描整个SD卡的广播了,呵呵,写到这里就算是写完了,写的很乱,希望大家将就的看下,希望对你有帮助!

 






 

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