可能大家都知道我们保存相册到手机的时候,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!