7.1.3 TimePicker结合案例详解

TimePicker是Android的时间设置控件。TimePicker类的继承图如下：
java.lang.Object
   ↳android.view.View
     ↳android.view.ViewGroup
       ↳android.widget.FrameLayout
         ↳android.widget.TimePicker
android.widget.TimePicker继承了android.widget.FrameLayout框架布局类。TimePicker例子如图7-8所示，从左到右是小时、分钟、上午和下午设置按钮，改变小时、分钟、上午和下午都会触发OnTimeChanged事件。
 


图7-8 TimePicker
请参考代码清单7-8，完整代码请参考chapter7_1工程中chapter7_TimePicker代码部分。
【代码清单7-8】

public class chapter7_TimePicker extends Activity {
	private TextView mTimeDisplay;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.timepicker_layout);

		TimePicker timePicker = (TimePicker) findViewById(R.id.timePicker);
		
		timePicker.setCurrentHour(12);
		timePicker.setCurrentMinute(15);

		mTimeDisplay = (TextView) findViewById(R.id.timetextview);

		timePicker
				.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
					@Override
					public void onTimeChanged(TimePicker view, int hourOfDay,
							int minute) {
						mTimeDisplay.setText(String.valueOf(hourOfDay) + " : "
								+ String.valueOf(minute));
					}
				});
	}
}

timePicker.setCurrentHour()方法设置当前时间，timePicker.setCurrentMinute()方法设置当前分钟。TimePicker.OnTimeChangedListener()是实现时间改变监听接口。
TimePicker的布局文件请参考代码清单7-9，完整代码请参考chapter7_1工程中timepicker_layout.xml代码部分（chapter7_1/res/layout/timepicker_layout.xml）。
【代码清单7-9】

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<TextView android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="@string/hello" />
	<TimePicker android:id="@+id/timePicker"
		android:layout_width="wrap_content" android:layout_height="wrap_content">
	</TimePicker>
	 
	 <TextView android:id="@+id/timetextview" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="@string/hello" />
</LinearLayout>

                                                出自《Android开发案例驱动教程》第七章