Enumeration e= getInitParameterNames();//该方法获得初始化参数名称集合
取值：while(e.hasMoreElements()){
String name=(String)e.nextElement();
}
Map initParams=new LinkedHashMap();
放值：initParams.put(name,value);//循环放值
取值：Set paramNames=initParams.keySet();
Iterator iter=paramNames.iterator();
while(iter.hasNext()){
String name=(String)iter.next();
String value=(String)initParams.get(name);
}
List < String > providersNames = (LocationManager)getSystemService(LOCATION_SERVICE).getAllProviders();
//获取系统所有的LocationProvider名称
StringBuilder stringBuilder = new StringBuilder();//使用StringBuilder保存数据
for(Iterator< String> iterator =providersNames.iterator(); iterator.hasNext() ){
stringBuilder.append(iterator.next) +"\n");
}
textView.setText(stringBuilder.toString());//显示LocationProvider名称
