3

我正在尝试将图像文件保存到外部存储。我可以将图片保存到 sdcard,但它没有显示在 Androids 画廊应用程序中。我试过这种方法:

File path = Environment.getExternalStorageDirectory();
            File f = new File(path + "/mydirectory/" + imageName + "_" +     System.currentTimeMillis() + ".jpg");
            FileOutputStream fos = new FileOutputStream(f);
            f.mkdirs();
            b.compress(CompressFormat.JPEG, 100, fos);
            fos.close();

            Uri contentUri = Uri.fromFile(f);
            Intent mediaScanIntent = new Intent("android.intent.action.MEDIA_SCANNER_SCAN_FILE");
            mediaScanIntent.setData(contentUri);
            getApplicationContext().sendBroadcast(mediaScanIntent);

但它不会出现在画廊中。谁能指出我解决这个问题的正确方向?

4

4 回答 4

11

使用此代码将图像位图保存在 android 设备库中

public void savePhoto(Bitmap bmp)
{
imageFileFolder = new File(Environment.getExternalStorageDirectory(),"Rotate");
imageFileFolder.mkdir();
FileOutputStream out = null;
Calendar c = Calendar.getInstance();
String date = fromInt(c.get(Calendar.MONTH))
            + fromInt(c.get(Calendar.DAY_OF_MONTH))
            + fromInt(c.get(Calendar.YEAR))
            + fromInt(c.get(Calendar.HOUR_OF_DAY))
            + fromInt(c.get(Calendar.MINUTE))
            + fromInt(c.get(Calendar.SECOND));
imageFileName = new File(imageFileFolder, date.toString() + ".jpg");
try
{
 out = new FileOutputStream(imageFileName);
 bmp.compress(Bitmap.CompressFormat.JPEG, 100, out);
 out.flush();
 out.close();
 scanPhoto(imageFileName.toString());
 out = null;
} catch (Exception e)
{
e.printStackTrace();
}
}


public String fromInt(int val)
{
return String.valueOf(val);
}


public void scanPhoto(final String imageFileName)
{
msConn = new MediaScannerConnection(PreviewDemo1.this,new MediaScannerConnectionClient()
{
public void onMediaScannerConnected()
{
msConn.scanFile(imageFileName, null);
Log.i("msClient obj  in Photo Utility","connection established");
}
public void onScanCompleted(String path, Uri uri)
{
msConn.disconnect();
Log.i("msClient obj in Photo Utility","scan completed");
}
});
msConn.connect();
} 

在这里,我将图像保存在“旋转”文件夹中,如果您不希望可以在 savePhoto 方法中轻松更改它。

于 2011-10-07T13:44:03.397 回答
5

我知道我回答这个问题有点晚了,但我想对于其他阅读这篇文章的人来说,surendra 给出的答案是正确的,并且使用 MediaScannerConnection 是更新画廊的一种方式。至于 nevva 建议对他的代码进行更改的方式是:

    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    Uri contentUri = Uri.fromFile(f);
    mediaScanIntent.setData(contentUri);
    getApplicationContext().sendBroadcast(mediaScanIntent);
于 2013-08-20T16:13:12.580 回答
2

我写了一篇关于在 Android 中扫描媒体文件的详细文章。 http://androidyue.github.io/blog/2014/01/19/scan-media-files-in-android/ 我希望这可以帮助你。

于 2014-01-20T05:45:01.097 回答
1

将位图保存到 sd 后,只需使用 MediaScannerConnection:

MediaScannerConnection.scanFile(this,
                new String[] { Bitmapfile.getAbsolutePath() }, null,
                new MediaScannerConnection.OnScanCompletedListener() {
                    public void onScanCompleted(String path, Uri uri) {
                        //now visible in gallery
                    }
                }
            );
于 2014-09-25T14:40:09.780 回答