Eclipse 开发 Android, Hello, TimePicker (学习8)
16lz
2022-04-19
Hello, TimePicker
A TimePicker
is a widget that allows the user to select the time by hour, minute and AM or PM.
Start a new project/Activity called HelloTimePicker.
修改 HelloTimePicker.java 代码如下:
package com.example.test;import java.util.Calendar;import android.app.Activity;import android.app.Dialog;import android.app.TimePickerDialog;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.TimePicker;public class HelloTimePicker extends Activity {private TextView mTimeDisplay;private Button mPickTime;private int mHour;private int mMinute;static final int TIME_DIALOG_ID = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // capture our View elements mTimeDisplay = (TextView) findViewById(R.id.timeDisplay); mPickTime = (Button) findViewById(R.id.pickTime); // add a click listener to the button mPickTime.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { showDialog(TIME_DIALOG_ID); } }); // get the current time final Calendar c = Calendar.getInstance(); mHour = c.get(Calendar.HOUR_OF_DAY); mMinute = c.get(Calendar.MINUTE); // display the current date updateDisplay();}@Overrideprotected Dialog onCreateDialog(int id) { switch (id) { case TIME_DIALOG_ID: return new TimePickerDialog(this, mTimeSetListener, mHour, mMinute, false); } return null;}// updates the time we display in the TextViewprivate void updateDisplay() { mTimeDisplay.setText( new StringBuilder() .append(pad(mHour)).append(":") .append(pad(mMinute)));}private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() { public void onTimeSet(TimePicker view, int hourOfDay, int minute) { mHour = hourOfDay; mMinute = minute; updateDisplay(); }}; private static String pad(int c) { if (c >= 10) return String.valueOf(c); else return "0" + String.valueOf(c); }}
Layout->main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/timeDisplay" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=""/> <Button android:id="@+id/pickTime" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Change the time"/></LinearLayout>
运行 Now run it. 运行结果如下:
源码下载:HelloTimePicker.zip
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