File comparison in Xamarin

You can visually compare pages. This resolution independent comparison allows you to quickly spot differences between pages.

There are two main ways to integrate the out-of-box UI components in your application:

1. Standalone activity
2. Comparison options dialog

The DiffActivity is a standalone component that handles from picking two files to generating the comparison result.

1. Define the activity

<activity
    android:name="com.pdftron.pdf.controls.DiffActivity"
    android:configChanges="keyboardHidden|orientation|screenSize|screenLayout|smallestScreenSize"
    android:theme="@style/PDFTronAppTheme"
    android:windowSoftInputMode="adjustPan" />

2. Show the activity

DiffActivity.Open(this);

If you have your own viewer already and only want to show the comparison options in your application, the DiffOptionsDialogFragment can be used.

public void Show(Context context, FragmentManager fragmentManager, List<Android.Net.Uri> files)
{
    var fragment = pdftron.PDF.Dialog.Diffing.DiffOptionsDialogFragment.NewInstance(
        files[0], files[1]
    );
    fragment.SetStyle((int)DialogFragmentStyle.Normal, Resource.Style.PDFTronAppTheme);
    fragment.DiffOptionsConfirmed += (sender, e) =>
    {
        CompareFiles(context, files, e.Color1, e.Color2, e.BlendMode);
    };
    fragment.Show(fragmentManager, "diff_options_dialog");
}

where compareFile is:

private void CompareFiles(Context context, List<Android.Net.Uri> files, int color1, int color2, int blendMode)
{
    Android.Net.Uri uri = pdftron.PDF.Dialog.Diffing.DiffUtils.CompareFilesImpl(context, files, color1, color2, blendMode);
    // do something with the output
}