麦子学院Android开发教程拍照保存系统相册不显示照片问题

现在几乎所有app应用都可以调用手机的照相功能了，但我在开始时碰到一个问题就是拍照之后在系统相册中找不到我拍照的照片怎么办？下面我来给各位同学一并分享一下。

系统已经有的东西，如果我们没有新的需求的话，直接调用是最直接的。

下面讲讲调用系统相机拍照并保存图片和如何调用系统相册的方法。

首先看看调用系统相机的核心方法：代码如下Intent camera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);startActivityForResult(camera, CAMERA);相机返回的数据通过下面的回调方法取得，并处理：代码如下@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if(requestCode == CAMERA && resultCode == Activity.RESULT_OK && null != data){String sdState=Environment.getExternalStorageState();if(!sdState.equals(Environment.MEDIA_MOUNTED)){GameLog.log(Tag, "sd card unmount");return;}new DateFormat();String name= DateFormat.format("yyyyMMdd_hhmmss",Calendar.getInstance(Locale.CHINA))+".jpg";Bundle bundle = data.getExtras();//获取相机返回的数据，并转换为图片格式Bitmap bitmap = (Bitmap)bundle.get("data");FileOutputStream fout = null;File file = new File("/sdcard/pintu/");file.mkdirs();String filename=file.getPath()+name;try {fout = new FileOutputStream(filename);press(pressFormat.JPEG, 100, fout);} catch (FileNotFoundException e) {e.printStackTrace();}finally{try {fout.flush();fout.close();} catch (IOException e) {e.printStackTrace();}}//显示图片}}下面是调用系统相册并取得照片的方法：代码如下Intent picture = newIntent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_C ONTENT_URI);startActivityForResult(picture, PICTURE);下面是相应的回调方法：代码如下@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if(requestCode == CAMERA && resultCode == Activity.RESULT_OK && null != data){Uri selectedImage = data.getData();String[] filePathColumns={MediaStore.Images.Media.DATA};Cursor c = this.getContentResolver().query(selectedImage, filePathColumns,null,null, null);c.moveToFirst();int columnIndex = c.getColumnIndex(filePathColumns[0]);String picturePath= c.getString(columnIndex);c.close();//获取图片并显示}这样就完成了系统调用，很简单,但是有些朋友会碰到照片拍好了，在手机相册中发现照片不显示呀。

解决Android拍照保存在系统相册不显示的问题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的源码贴出来吧代码如下/*** 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 {press(pressFormat.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，我把源码贴出来吧代码如下/*** 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，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代码如下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代码如下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代码如下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代码如下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;}根据上面的那个方法获取到的就是图片的绝对路径。