android - Ics文件未按预期在Android中解析和检索数据。 (使用ical4库)

Question

我正在尝试使用示例代码库解析ics文件：
这是指向我正在使用的示例项目的链接/指的是：project link

一旦我尝试解析数据，它要么由于空指针异常而崩溃，要么抛出错误，指出无法解析文件。 （我在上面的链接中添加了该项目的整个代码，这是一个很小的项目）。
这是我为此使用的mainactivity代码：

public class MainActivity extends AppCompatActivity {

    public static final String TAG = MainActivity.class.getCanonicalName();

    public static final Boolean DEBUG = true; //BuildConfig.DEBUG;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent i = getIntent();
        Log.d(TAG, "Dumping Intent start");
        Log.d(TAG, "Action: "+i.getAction());
        Log.d(TAG, "URI: "+i.getDataString());
        Log.d(TAG, "Type: "+i.getType());
        Bundle bundle = i.getExtras();
        if (bundle != null) {
            Set<String> keys = bundle.keySet();
            Iterator<String> it = keys.iterator();
            while (it.hasNext()) {
                String key = it.next();
                Log.d(TAG, "[" + key + "=" + bundle.get(key) + "]");
            }
        }
        Log.d(TAG, "Dumping Intent end");

        Log.d(TAG, getFilePathFromUri(this, i.getData()));
        try {
            startActivity(new ICALParser(new FileInputStream(getFilePathFromUri(this, i.getData()))).buildIntent());
        } catch (Exception e) {
            if(DEBUG) Log.e(TAG, "Couldn't parse",e);
        }

        if(DEBUG) Log.d(TAG, "Done");
        finish();

    }

    //http://stackoverflow.com/a/23750660
    public static String getFilePathFromUri(Context c, Uri uri) {
        String filePath = new File(uri.getPath()).getAbsolutePath();
        if ("content".equals(uri.getScheme())) {
            String[] filePathColumn = { MediaStore.MediaColumns.DATA };
            ContentResolver contentResolver = c.getContentResolver();
            Cursor cursor = contentResolver.query(uri, filePathColumn, null, null, null);
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
             filePath = cursor.getString(columnIndex);
            cursor.close();
        } else if ("file".equals(uri.getScheme())) {
             filePath = new File(uri.getPath()).getAbsolutePath();
        }
        return filePath;
    }
}

问题似乎发生在：getFilePathFromUri中，它要么由于空指针异常而崩溃，例如：android.net.Uri.getScheme（），要么抛出随机解析错误，其内容每次都不相同。
这是我正在使用的解析器类：

public class ICALParser {
    public static final String TAG = ICALParser.class.getCanonicalName();
    public static final boolean DEBUG = MainActivity.DEBUG;

    private Calendar calendar;
    private VEvent event;

    public ICALParser(InputStream ics) throws IOException, ParserException {
        CalendarBuilder builder = new CalendarBuilder();
        calendar = builder.build(ics);
        event = findFirstEvent();
    }

    public Intent buildIntent(){
        Intent i = new Intent(Intent.ACTION_INSERT, CalendarContract.Events.CONTENT_URI);

        if(DEBUG) {
            for (Object o : event.getProperties()) {
                Property property = (Property) o;
                Log.d(TAG, "Property [" + property.getName() + ", " + property.getValue() + "]");
            }
        }

        i.putExtra(CalendarContract.Events.TITLE, getValueOrNull(Property.SUMMARY));
        i.putExtra(CalendarContract.Events.DESCRIPTION, getValueOrNull(Property.DESCRIPTION));
        i.putExtra(CalendarContract.Events.EVENT_LOCATION, getValueOrNull(Property.LOCATION));

        long start = event.getStartDate().getDate().getTime();
        long end = event.getEndDate().getDate().getTime();
        i.putExtra(CalendarContract.EXTRA_EVENT_BEGIN_TIME,start);
        i.putExtra(CalendarContract.EXTRA_EVENT_END_TIME, end);

        boolean allDayEvent = ((event.getProperty("X-MICROSOFT-CDO-ALLDAYEVENT") != null            //Microsoft's custom field exists
                && event.getProperty("X-MICROSOFT-CDO-ALLDAYEVENT").getValue().equals("true"))  //  and is true, or
                || (end-start % 1000*60*60*24 == 0 ) );                                             //the duration is an integer number of days
        i.putExtra(CalendarContract.EXTRA_EVENT_ALL_DAY, allDayEvent);

        i.putExtra(CalendarContract.Events.RRULE, getValueOrNull(Property.RRULE));

        return i;
    }

    private String getValueOrNull(String name){
        Property p = event.getProperty(name);
        return p == null ? null : p.getValue();
    }

    private VEvent findFirstEvent(){
        for (Object o : calendar.getComponents()) {
            Component c = (Component) o;
            VEvent e = c instanceof VEvent ? ((VEvent) c) : null;
            if (e != null) {
                return e;
            }
        }
        return null;
    }


}

上面附加的项目可以编译并且可以运行，但是，原始文件夹中附加的ics文件不会被解析并映射到我设备上的日历上。您知道如何解决此问题吗？

Answer 1

这似乎有些过大。为什么不通过以下代码将事件直接添加到您的日历中？ ：

Intent intent = new Intent(Intent.ACTION_INSERT);
        intent.setData(CalendarContract.Events.CONTENT_URI);
// pass the values below somehow , either through a callback or some method, whatever you're using. 
        intent.putExtra(CalendarContract.Events.TITLE, contentTitle);
        intent.putExtra(CalendarContract.Events.EVENT_LOCATION, locationAddress);
        intent.putExtra(CalendarContract.Events.DESCRIPTION, contentDescription);

        intent.putExtra(CalendarContract.EXTRA_EVENT_BEGIN_TIME, startTimeInMilliseconds);
        intent.putExtra(CalendarContract.EXTRA_EVENT_END_TIME, endTimeInMilliseconds );
            intent.putExtra(CalendarContract.Events.EVENT_TIMEZONE, eventTimeZone);
            intent.putExtra(CalendarContract.Events.EVENT_END_TIMEZONE, eventTimeZone); // pass your event time zone here, if any.

        // Making it private and shown as busy
        intent.putExtra(CalendarContract.Events.ACCESS_LEVEL, CalendarContract.Events.ACCESS_PRIVATE);
        intent.putExtra(CalendarContract.Events.AVAILABILITY, CalendarContract.Events.AVAILABILITY_BUSY);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        startActivity(intent);