简单复习下基础UI组件,做个简单的总结,Android的这些组件封装的特别好,基本套上就能使用,当然,这个减轻了开发者的负担!不过如果想要深入研究,这里面还是有很大的空间值得深度分析!简单的几个例子!仅供参考:
CalendarView代码区 :
main.xml代码区:CalendarView组件的使用加上一些简单的属性即可!
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="选择您的生日:"/>
<CalendarView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:firstDayOfWeek="3"
android:shownWeekCount="4"
android:selectedWeekBackgroundColor="#aff"
android:focusedMonthDateColor="#f00"
android:weekSeparatorLineColor="#ff0"
android:unfocusedMonthDateColor="#f9f"
android:id="@+id/calendarView" />
LinearLayout>
Activity区代码:
public class MainActivity extends Activity
{
CalendarView cv;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
cv = (CalendarView)findViewById(R.id.calendarView);
// 为CalendarView组件的日期改变事件添加事件监听器
cv.setOnDateChangeListener(new OnDateChangeListener()
{
@Override
public void onSelectedDayChange(CalendarView view, int year,
int month, int dayOfMonth)
{
// 使用Toast显示用户选择的日期
Toast.makeText(MainActivity.this,
"你生日是" + year + "年" + month + "月"
+ dayOfMonth + "日",
Toast.LENGTH_SHORT).show();
}
});
}
}
DatePicker,TimePicker,结合Calerdar的使用,可以供用户选择日期时使用:
代码区:
main.xml代码:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="选择购买本书的具体时间"/>
<DatePicker android:id="@+id/datePicker"
android:layout_width="wrap_content"
android:layout_height="200dp"
android:layout_gravity="center_horizontal"
android:startYear="2000"
android:endYear="2016"
android:calendarViewShown="true"
android:spinnersShown="true"/>
<TimePicker android:id="@+id/timePicker"
android:layout_width="wrap_content"
android:layout_height="100dp"
android:layout_gravity="center_horizontal"/>
<EditText android:id="@+id/show"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:editable="false"
android:cursorVisible="false"/>
LinearLayout>
Activity代码:
public class MainActivity extends Activity
{
// 定义5个记录当前时间的变量
private int year;
private int month;
private int day;
private int hour;
private int minute;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DatePicker datePicker = (DatePicker)
findViewById(R.id.datePicker);
TimePicker timePicker = (TimePicker)
findViewById(R.id.timePicker);
// 获取当前的年、月、日、小时、分钟
Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);
hour = c.get(Calendar.HOUR);
minute = c.get(Calendar.MINUTE);
// 初始化DatePicker组件,初始化时指定监听器
datePicker.init(year, month, day, new OnDateChangedListener()
{
@Override
public void onDateChanged(DatePicker arg0, int year
, int month, int day)
{
MainActivity.this.year = year;
MainActivity.this.month = month;
MainActivity.this.day = day;
// 显示当前日期、时间
showDate(year, month, day, hour, minute);
}
});
timePicker.setEnabled(true);
// 为TimePicker指定监听器
timePicker.setOnTimeChangedListener(new OnTimeChangedListener()
{
@Override
public void onTimeChanged(TimePicker view
, int hourOfDay, int minute)
{
MainActivity.this.hour = hourOfDay;
MainActivity.this.minute = minute;
// 显示当前日期、时间
showDate(year, month, day, hour, minute);
}
});
}
// 定义在EditText中显示当前日期、时间的方法
private void showDate(int year, int month
, int day, int hour, int minute)
{
EditText show = (EditText) findViewById(R.id.show);
show.setText("您的购买日期为:" + year + "年"
+ (month + 1) + "月" + day + "日 "
+ hour + "时" + minute + "分");
}
}
NumberPicker主要使用在给用户提供数字选择时使用。
main.xml代码:
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:text="选择低价:"
android:layout_width="120dp"
android:layout_height="wrap_content" />
<NumberPicker
android:id="@+id/np1"
android:layout_width="match_parent"
android:layout_height="80dp"
android:focusable="true"
android:focusableInTouchMode="true" />
TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:text="选择高价:"
android:layout_width="120dp"
android:layout_height="wrap_content" />
<NumberPicker
android:id="@+id/np2"
android:layout_width="match_parent"
android:layout_height="80dp"
android:focusable="true"
android:focusableInTouchMode="true" />
TableRow>
TableLayout>
Activity代码:
public class MainActivity extends Activity
{
NumberPicker np1, np2;
// 定义最低价格、最高价格的初始值
int minPrice = 25, maxPrice = 75;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
np1 = (NumberPicker) findViewById(R.id.np1);
// 设置np1的最小值和最大值
np1.setMinValue(10);
np1.setMaxValue(50);
// 设置np1的当前值
np1.setValue(minPrice);
np1.setOnValueChangedListener(new OnValueChangeListener()
{
// 当NumberPicker的值发生改变时,将会激发该方法
@Override
public void onValueChange(NumberPicker picker,
int oldVal, int newVal)
{
minPrice = newVal;
showSelectedPrice();
}
});
np2 = (NumberPicker) findViewById(R.id.np2);
// 设置np2的最小值和最大值
np2.setMinValue(60);
np2.setMaxValue(100);
// 设置np2的当前值
np2.setValue(maxPrice);
np2.setOnValueChangedListener(new OnValueChangeListener()
{
// 当NumberPicker的值发生改变时,将会激发该方法
@Override
public void onValueChange(NumberPicker picker, int oldVal,
int newVal)
{
maxPrice = newVal;
showSelectedPrice();
}
});
}
private void showSelectedPrice()
{
Toast.makeText(this, "您选择最低价格为:" + minPrice
+ ",最高价格为:" + maxPrice, Toast.LENGTH_SHORT)
.show();
}
}
如若各位有好的意见,欢迎留言!