Android第二十课；DataPicker与TimePicker

exercise

改变时间或者日期都会改变标题栏上的内容，使之与改变的日期时间相对应
用一个button实现页面跳转
layout下
新建一个datapicker.xml

  <DatePicker        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/datePicker"        android:layout_weight="0.59" />    <Button        android:text="Button"        android:background="#ffffff"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/button"        android:layout_weight="0.59" />

新建一个timepicker.xml

<TimePicker        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/timePicker" />

Acitivity下
新建一个DataPicker.java

public class DataPicker extends AppCompatActivity {    private DatePicker datePicker;    private Calendar   calendar;    private int year;    private int month;    private int day;    private int hour;    private int minute;    private Button btn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.datapicker);        //获取日历的一个对象        calendar=Calendar.getInstance();        //获取年月日时分秒的信息        year=calendar.get(Calendar.YEAR);        month=calendar.get(Calendar.MONTH)+1;//Calendar的一月是计为0月的，所以实际月份要加一        day=calendar.get(Calendar.DAY_OF_MONTH);        hour = calendar.get(Calendar.HOUR_OF_DAY);        minute=calendar.get(Calendar.MINUTE);        //把时间信息写在标题栏上        setTitle(year+"-"+month+"-"+day+"-"+hour+":"+minute);        datePicker = (DatePicker) findViewById(R.id.datePicker);        //dataPicker初始化,输入的数据将是datapicker一打开最初始的数据，它获取month时会把数据加一，跟我们在跟Calendar获取month时加一时一样，所以设置一个减一        datePicker.init(year, month-1, day, new DatePicker.OnDateChangedListener() {            @Override            //i=year;i1=monthofyear;i2=dayofmonth            //因为i1（月份）返回时是以0为计数的，所以我们要加一            public void onDateChanged(DatePicker datePicker, int i, int i1, int i2) {                setTitle(i+"-"+(i1+1)+"-"+i2);            }        });        //DatePickerDialog        new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {            //i代表year,i1代表monthOfyear,i2代表dayOfmonth            @Override            public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {                setTitle(i+"-"+(i1+1)+"-"+i2);            }        },year,month-1,day).show();//这一行的三个数据设置初始化的时间        btn= (Button) findViewById(R.id.button);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Intent intent=new Intent(DataPicker.this, com.example.lengary_l.test14.TimePicker.class);                startActivity(intent);            }        });    }}

新建一个TimePicker.java

public class TimePicker extends AppCompatActivity {    private Calendar calendar;    private int hour;    private int minute;    private android.widget.TimePicker timePicker;    @Override    protected void onCreate( Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.timepicker);        calendar=Calendar.getInstance();        hour = calendar.get(Calendar.HOUR_OF_DAY);        minute=calendar.get(Calendar.MINUTE);          timePicker = (android.widget.TimePicker) findViewById(R.id.timePicker);        timePicker.setOnTimeChangedListener(new android.widget.TimePicker.OnTimeChangedListener() {            //i代表hourOfday i1代表minute            @Override            public void onTimeChanged(android.widget.TimePicker timePicker, int i, int i1) {                setTitle(i+":"+i1);            }        });        //TimePickerDialog        new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {            //i代表hourOfday i1代表minute            @Override            public void onTimeSet(android.widget.TimePicker timePicker, int i, int i1) {            }        },hour,minute,true).show();//前两个设置初始时间，最后一个设置是否24小时显示    }}

mainifest下

<activity android:name=".DataPicker">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name=".TimePicker">        </activity>