9.1筆記，系統分享，Fragment not attached to Activity

不用sdk，用系統自帶分享功能

http://ju.outofmemory.cn/entry/172831

package zivixgroup.com.skilltemp.utils;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.net.Uri;

import java.io.File;

import zivixgroup.com.skilltemp.Config.PushCode;
import zivixgroup.com.skilltemp.R;

/** * Created by george.yang on 2015/8/31. */
public class ShareUtil {
    public static boolean shareToEmail (Activity activity,String subject,String content) {
        try {
            Intent email = new Intent(android.content.Intent.ACTION_SEND);
            email.setType("plain/text");
            //i.setType("message/rfc822");
            //邮件主题
            email.putExtra(android.content.Intent.EXTRA_SUBJECT, subject);
            //邮件内容
            email.putExtra(android.content.Intent.EXTRA_TEXT, content);

            //请选择邮件发送内容
            activity.startActivityForResult(Intent.createChooser(email, activity.getString(R.string.ChooseSendType)), PushCode.share_email);
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /** * 发短信 */
    public static   boolean  sendSMS(Activity activity,String content){
        try {
            Uri smsToUri = Uri.parse("smsto:");
            Intent sendIntent =  new  Intent(Intent.ACTION_VIEW, smsToUri);
            //sendIntent.putExtra("address", "123456"); // 电话号码，这行去掉的话，默认就没有电话
            //短信内容
            sendIntent.putExtra( "sms_body", content);
            sendIntent.setType("vnd.android-dir/mms-sms");
            activity.startActivityForResult(sendIntent, PushCode.share_sms);
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    public static boolean shareToWhatsApp (Activity activity,String content) {
        Intent whatsappIntent = new Intent(Intent.ACTION_SEND);
        whatsappIntent.setType("text/plain");
        whatsappIntent.setPackage("com.whatsapp");
        whatsappIntent.putExtra(Intent.EXTRA_TEXT, content);
        try {
            activity.startActivity(whatsappIntent);
        } catch (android.content.ActivityNotFoundException ex) {
           return false;
        }
        return true;
    }

    /** * 分享信息到朋友 * @param activity * @return */
    public static boolean shareToWeChatFriend (Activity activity,String content) {
        try {
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_SEND);
            intent.putExtra(Intent.EXTRA_TEXT, content);
            intent.setType("text/*");

            ComponentName componentName = new ComponentName("com.tencent.mm", "com.tencent.mm.ui.tools.ShareImgUI");
            intent.setComponent(componentName);
            activity.startActivity(intent);
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /** * 分享信息到朋友圈 * */
    public static boolean shareToWeChatTimeLine(Activity activity,String content) {
        try {
            Intent intent = new Intent();
            ComponentName componentName = new ComponentName("com.tencent.mm", "com.tencent.mm.ui.tools.ShareToTimeLineUI");
            intent.setComponent(componentName);

            intent.setAction(Intent.ACTION_SEND);
            intent.putExtra(Intent.EXTRA_TEXT, content);
            intent.setType("text/*");
            activity.startActivity(intent);
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /** * 分享信息到朋友圈 * * @param file，假如图片的路径为path，那么file = new File(path); */
    public static boolean shareToWeChatTimeLine(Activity activity,File file,String content) {
        try {
            Intent intent = new Intent();
            ComponentName componentName = new ComponentName("com.tencent.mm", "com.tencent.mm.ui.tools.ShareToTimeLineUI");
            intent.setComponent(componentName);

            intent.setAction(Intent.ACTION_SEND);
            intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
            intent.putExtra(Intent.EXTRA_TEXT, content);
            intent.setType("image/*;text/*");
            activity.startActivity(intent);
        } catch (Exception e) {
            return false;
        }
        return true;
    }
}

防止
java.lang.IllegalStateException: Fragment not attached to Activity
http://blog.chengyunfeng.com/?p=522
比較多人回答是判斷一下:
isadd()