这个 Android 代码是用来做什么的？

Question

I'm new on Android development, can you please explain me the following code and for what this Android code is it used?

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    try {

        if (requestCode == RESULT_LOAD_IMG && resultCode == getActivity().RESULT_OK
                && null != data) {

            selectedImage = data.getData();

            String[] filePathColumn = { MediaStore.Images.Media.DATA };
            // Get the cursor
            Cursor cursor = getActivity().getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            // Move to first row
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            imgPath = cursor.getString(columnIndex);
            cursor.close();


            String fileNameSegments[] = imgPath.split("/");
            fileName = fileNameSegments[fileNameSegments.length - 1];
            _txt_img_url.setText(fileName);
            Toast.makeText(getActivity(), fileName, Toast.LENGTH_SHORT).show();

            ImageTask imgtask = new ImageTask();
            imgtask.execute();

Answer 1

onActivityResult method is used to handle the data returned from an intent, check here the documentation https://developer.android.com/training/basics/intents/result.html

In short in this case if the result is ok, and we have data to handle, a toast appear with the path of the selected file.