ActivitityExistHelper.java

package com.sogouchat.util;

import java.util.List;

import android.app.ActivityManager;
import android.app.ActivityManager.RunningTaskInfo;
import android.content.Context;

public class ActivitityExistHelper {
	public static final int PACK_NOT = 0;
	public static final int PACK_IN = 1;
	public static final int PACK_IN_ITEM = 2;
	public static final int PACK_IN_LIST = 3;
	public static final int PACK_IN_NEW = 4;
	private static final String PACK_STR = "com.sogouchat";
	private static final String ACTIVITY_STR_NEW = "com.sogouchat.popnewmsg.MultiPopTabActivity";
	private static final String ACTIVITY_STR_LIST = "com.sogouchat.ui.ConversationListActivity";
	private static final String ACTIVITY_STR_ITEM = "com.sogouchat.ui.ConversationActivity";
	public static int GetCurrentAcitivity(Context context){
		int nRet = PACK_NOT;
		RunningTaskInfo info = GetForeGroundTask(context);
		if (info!=null) {
			final String strPackString = info.topActivity.getPackageName();
			final String strActivity = info.topActivity.getClassName();
			if (PACK_STR.equals(strPackString)) {
				
				if (strActivity.equals(ACTIVITY_STR_ITEM)) {
					nRet = PACK_IN_ITEM;
				}if (strActivity.equals(ACTIVITY_STR_LIST)) {
					nRet = PACK_IN_LIST;
				}if (strActivity.equals(ACTIVITY_STR_NEW)) {
					nRet = PACK_IN_NEW;
				} else {
					nRet = PACK_IN;
				}
			}
		}
		return nRet;
	}
    public static RunningTaskInfo GetForeGroundTask(Context context){
		ActivityManager activityManager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
		List<RunningTaskInfo>  lInfos =activityManager.getRunningTasks(1);
		int nCount =lInfos.size();
		String strProcessName=null;
		String strProcessClass = null;
		if (nCount>0) {
			RunningTaskInfo rInfo = lInfos.get(0);
			strProcessName = rInfo.topActivity.getPackageName();
			strProcessClass = rInfo.topActivity.toString();
			strProcessClass = rInfo.topActivity.getClassName();
			return rInfo;
		}
		return null;
	}
}