TwitterSharing.java

/*
 Swisscom Safe Connect
 Copyright (C) 2015 Swisscom

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package com.swisscom.safeconnect.sharing;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import android.content.Context;
import android.content.Intent;
import android.util.Log;

import com.swisscom.safeconnect.BuildConfig;
import com.swisscom.safeconnect.R;

public class TwitterSharing extends Sharing {
    public final static String PACKAGE_NAME = "com.twitter.android";

    private final static String API_URL = "https://twitter.com/intent/tweet?";
    private final static String URL_CODE = "url=";
    private final static String TEXT_CODE = "text=";
    private final static String HASHTAG = " #SafeConnect ";

    public TwitterSharing(Context ctx){
        super(ctx, PACKAGE_NAME);
    }

    @Override
    protected Intent shareWithBrowser(String text, String url) {
        return getBrowserIntent(API_URL+TEXT_CODE+text+"&"+URL_CODE+url, "Twitter", R.drawable.twitter);
    }

    @Override
    public Intent getIntent(String text, String url) {
        String twitterContent = getTwitterText(text, url);
        
        Intent intent = getSharingApp(PACKAGE_NAME, "", twitterContent+url, mContext);
        if (intent == null) {
        	// need to url encode this stuff for Twitter
        	try {
        		twitterContent = URLEncoder.encode(twitterContent, "UTF-8");
        		url = URLEncoder.encode(url, "UTF-8");
        	} catch (UnsupportedEncodingException e) {
        		if (BuildConfig.DEBUG) Log.e("SafeApp", "Unsupported encoding", e);
        	}
        	intent = shareWithBrowser(twitterContent, url);
        }
        
        return intent;
    }

    private String getTwitterText(String text, String url){
        String twitterContent = text;

        //HTTPS url is counted as 23 chars
        //https://dev.twitter.com/docs/faq#5810
        final int urlCharsToCount = 23;

        if ((text.length() + HASHTAG.length() + urlCharsToCount > 140)) {
            twitterContent = text.substring(0, (136 - HASHTAG.length() - urlCharsToCount)) + "...";
        }

        return twitterContent + HASHTAG;
    }
}