安卓调用系统日历控件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    >    <LinearLayout        android:background="@android:color/holo_orange_dark"        android:layout_width="match_parent"        android:layout_height="55dp">        <Button            android:onClick="cancel"            android:text="取消"            android:layout_weight="1"            android:layout_width="0dp"            android:layout_height="match_parent"/>          <Button              android:onClick="confirm"              android:text="确认"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="match_parent"/>    </LinearLayout>    <DatePicker        android:id="@+id/datepicker"        android:layout_width="match_parent"        android:calendarViewShown="false"        android:layout_height="wrap_content"/></LinearLayout>

public class MainActivity extends AppCompatActivity {    private DatePicker datePicker;    private int        year;    private int        month;//月份是从0开始算的.    private int        day;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        this.requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题栏        setContentView(R.layout.activity_main);        datePicker = (DatePicker) findViewById(R.id.datepicker);//        initData();    }    public void initData(){        Calendar calendar = Calendar.getInstance();        year = calendar.get(Calendar.YEAR);        month = calendar.get(Calendar.MONTH);        day = calendar.get(Calendar.DAY_OF_MONTH);        datePicker.init(year, month, day, new DatePicker.OnDateChangedListener() {            @Override            public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {                Toast.makeText(MainActivity.this, year + "年" + (monthOfYear+1) + "月" + dayOfMonth + "日", Toast.LENGTH_SHORT).show();            }        });    }    public void cancel(View v){        Toast.makeText(this, "取消,按照工单给的补抄日期", Toast.LENGTH_SHORT).show();    }    public void confirm(View v){        Toast.makeText(this, "确认", Toast.LENGTH_SHORT).show();    }}

备注:

  1.这里必须继承AppCompatActivity,才会出现这个界面,否则你继承的是Activity,出现的界面很丑,黑白的,但是你有时候继承

AppCompatActivity会报错.

报错如下：java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test2/com.example.test2.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.解决方法：创建的activity是MainActivity extends ActionBarActivity这样的。把后面的ActionBarActivity改成Activity，
然后导包，把下面报错的地方删掉运行就不报错了。。。
 导入support:appcompat-v7支持包,我导入的25.1版本的.另外导入的时候也可能报错,需要修改compileSdkVersion版本.
compile 'com.android.support:appcompat-v7:25.1.0'