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我想要一个日历视图，可以显示公共谷歌日历的所有事件。我的用户有一个 OAuth 2.0 客户端 ID，并且我的日历设置为 PUBLIC。然后我浏览了日历提供程序教程（https://developer.android.com/guide/topics/providers/calendar-provider.html）并使用以下代码：

public class MainActivity extends Activity {

// Projection array. Creating indices for this array instead of doing
// dynamic lookups improves performance.
public static final String[] EVENT_PROJECTION = new String[]{
        CalendarContract.Calendars._ID,                           // 0
        CalendarContract.Calendars.ACCOUNT_NAME,                  // 1
        CalendarContract.Calendars.CALENDAR_DISPLAY_NAME,         // 2
        CalendarContract.Calendars.OWNER_ACCOUNT                  // 3
};

// The indices for the projection array above.
private static final int PROJECTION_ID_INDEX = 0;
private static final int PROJECTION_ACCOUNT_NAME_INDEX = 1;
private static final int PROJECTION_DISPLAY_NAME_INDEX = 2;
private static final int PROJECTION_OWNER_ACCOUNT_INDEX = 3;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Run query
    Cursor cur = null;
    ContentResolver cr = getContentResolver();
    Uri uri = CalendarContract.Calendars.CONTENT_URI;
    String selection = "((" + CalendarContract.Calendars.ACCOUNT_NAME + " = ?) AND ("
            + CalendarContract.Calendars.ACCOUNT_TYPE + " = ?) AND ("
            + CalendarContract.Calendars.OWNER_ACCOUNT + " = ?))";
    String[] selectionArgs = new String[]{"****@gmail.com", "google.com",
            "****@gmail.com"};
// Submit the query and get a Cursor object back.
    cur = cr.query(uri, EVENT_PROJECTION, selection, selectionArgs, null);

    // Use the cursor to step through the returned records
    while (cur.moveToNext()) {
        long calID = 0;
        String displayName = null;
        String accountName = null;
        String ownerName = null;

        // Get the field values
        calID = cur.getLong(PROJECTION_ID_INDEX);
        displayName = cur.getString(PROJECTION_DISPLAY_NAME_INDEX);
        accountName = cur.getString(PROJECTION_ACCOUNT_NAME_INDEX);
        ownerName = cur.getString(PROJECTION_OWNER_ACCOUNT_INDEX);
    }
}

}

不幸的是，光标一直是空的。我也试图将 ACCOUNT_TYPE 定义为“LOCAL”，但它没有用。目标 SDK 设置为 21，我拥有所有必要的权限。

如何检索日历中的事件？请帮忙 /：

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