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