1、map格式字符串如何解析？

借助json,先将字符串转化为json格式，再取值

JSONObject object = new JSONObject(posMap);

clientIden = object.getString("iden");

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1、android中新建的项目如何去掉标题栏

修改AndroidManifest.xml中的主题：

android:theme="@style/Theme.AppCompat.Light.NoActionBar">

2、有的时候需要隐藏掉EditText的边框和下划线

android:background="@null"

3、R包不存在

build---> cleanProject--->buildProject---->到类中重新导入包就可以了

4、Fragment中要用到土司

Toast.makeText(getActivity(), "ddd", Toast.LENGTH_SHORT).show();

5、android开发中引入依赖包

file--->project Structure---->app----->dependencies------->右上角加号---->library dependency---->搜索添加

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1、获取系统当前日期

final Calendar ca = Calendar.getInstance();

mSt_Year = ca.get(Calendar.YEAR);

mSt_Month = ca.get(Calendar.MONTH);

mSt_Day = ca.get(Calendar.DAY_OF_MONTH);

2、日期对话框

DatePickerDialog dpd = new DatePickerDialog(FilterActivity.this, new DatePickerDialog.OnDateSetListener() {

@Override

public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {

String DateStr = year+"年"+(month+1)+"月"+dayOfMonth+"日";

mTv_date.setText(DateStr);

}

},mSt_Year,mSt_Month,mSt_Day);

dpd.show();