查找mainActivity名称_app 查看main activy

通过context查询AndroidManifest.xml内已标记的main_name
突然有了这个需求，那么就动手

public static String[] getMainActivityString(Context c) {
        //通过context获取mainActivity名称
        //如果存在多个main
        try {
            StringBuffer ies = new StringBuffer();
            PackageManager pm = c.getPackageManager();
            String name = c.getPackageName();
            PackageInfo info = pm.getPackageInfo(name, PackageManager.GET_ACTIVITIES);
            ActivityManager manager= (ActivityManager) c.getSystemService(Context.ACTIVITY_SERVICE);
            Intent intent = manager.getRunningTasks(1).get(0).baseIntent;
            if (intent == null || info == null) {return null;}
            ActivityInfo[] act = info.activities;
            if (act == null) {return null;}
            for (int i=0;i < act.length;i++) {
                String ie = act[i].name;
                String sub = ie.substring(name.length(), ie.length());
                if (intent.toString().contains(sub)) {
                    ies.append(ie);
                    ies.append(",");
                    //获取栈内intent信息，对比info内的所有
                }
            }
            return ies.toString().split(",");//返回组，分割字符
        } catch (Exception e) {
            return null;
        }
	}
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