试试这个code：

        ActivityManager activityManager = (ActivityManager) this.getSystemService( ACTIVITY_SERVICE );
        List<RunningAppProcessInfo> procInfos = activityManager.getRunningAppProcesses();
        for(int i = 0; i < procInfos.size(); i++)
        {
            if(procInfos.get(i).processName.equals("com.android.browser")) 
            {
                Toast.makeText(getApplicationContext(), "Browser is running", Toast.LENGTH_LONG).show();
            }
        }