Question

我正在尝试将图像文件保存到外部存储设备。我可以将图片保存到SD卡，但它不会出现在Androids gallery应用程序中。我尝试过这种方法：

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);

但它没有出现在画廊中。任何人都可以指出我正确的方向来解决这个问题吗？

Answer 1

使用此代码在Android设备库中保存图像位图

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();
}

如果您不希望在savePhoto方法中轻松更改图像，我将在“旋转”文件夹中保存图像。

Answer 2

我知道我回答这个问题的时间有点迟了但我猜其他任何读这篇文章的人肯定都是正确的，并且使用MediaScannerConnection是一种更新图库的方法。至于nevva建议改变他的代码的方式是：

    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    Uri contentUri = Uri.fromFile(f);
    mediaScanIntent.setData(contentUri);
    getApplicationContext().sendBroadcast(mediaScanIntent);

Answer 3

我已经写了一篇关于在Android中扫描媒体文件的详细帖子。 http://androidyue.github.io/blog/2014/01/19/scan-media-files-in-android/ 我希望这可以帮到你。

Answer 4

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
                    }
                }
            );

使用新创建的位图更新android图库

4 个答案: