//有些属性用不了的话，就把api改到21以上就行了。

//例如：

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.example.hasee.a828huadong"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

/第一步我的布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.hasee.a828huadong.Main2Activity">

    <!--firstDayOfWeek是设置第一个是星期几，我写的2，是星期一第一个-->
    <!-- android:headerBackground="#808080"是设置头布局的颜色，不过我隐藏头布局了-->
    <!--android:headerBackground="#808080"-->
    
    <DatePicker
        android:layout_gravity="center"
        android:theme="@style/AppTheme2"
        android:firstDayOfWeek="2"
        android:id="@+id/datePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         />
</LinearLayout>

//第二步 Activity里隐藏头布局，并点击哪个日期，哪个就吐司信息

public class Main2Activity extends AppCompatActivity {

    private DatePicker datePicker;
    Calendar c;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        initView();
    }


    private void initView() {
        datePicker = (DatePicker) findViewById(R.id.datePicker);
        
        //这句隐藏头布局
        ((LinearLayout) ((ViewGroup)datePicker.getChildAt(0)).getChildAt(0)).setVisibility(View.GONE);
        c=Calendar.getInstance();

        //将日历初始化为当前系统时间，并设置其事件监听
        datePicker.init(c.get(Calendar.YEAR),c.get(Calendar.MONTH),c.get(Calendar.DAY_OF_MONTH),
                new DatePicker.OnDateChangedListener() {

                    @Override
                    public void onDateChanged(DatePicker view, int year, int monthOfYear,
                                              int dayOfMonth) {
                        // TODO Auto-generated method stub
                        //当前日期更改时，在这里设置
                        int monthOfYear1 = monthOfYear+1;
                        c.set(year,monthOfYear,dayOfMonth);
                        ToastUtil.show(Main2Activity.this,year+","+monthOfYear1+","+dayOfMonth+"");
                    }
                });
    }


}

//第三步自定义一个style。

<style name="AppTheme2" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <!--这个绿色是选中时的背景颜色，和当前日期的颜色-->
    <item name="colorAccent">@color/Green</item>

    <!--设置字体颜色-->
    <item name="android:textColorPrimary">@android:color/holo_blue_dark</item>
</style>

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