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android 通过TimePickerDialog修改时间
初学android,写了个修改时间的小程序,实现如下;
点击change按钮,弹出时间对话框;
然后点击Done,设置显示时间;
实现方式有两种,
一种是使用showDialog方法,不过此种方法已过期,但还可以用;
另一种是使用DialogFragment类来实现;
先看第二种方式:
其中layout的activity_main.xml配置为:
<?xml version="1.0" encoding="utf-8"?><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:id="@+id/timepicker_display" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:textSize="20sp" /> <Button android:id="@+id/button_timepicker" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="change " /></LinearLayout>
MainActivity.java:
package com.process.processbar;import java.util.Calendar;import android.app.Activity;import android.app.Dialog;import android.app.DialogFragment;import android.app.TimePickerDialog;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.TimePicker;public class MainActivity extends Activity { private TextView timePickerDisplay; private Button buttonTimePicker; private int mHour; // 设置小时 private int mMinute; // 设置分钟 static final int TIME_DIALOG_ID = 0; // 对话框的ID @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); timePickerDisplay = (TextView) findViewById(R.id.timepicker_display); buttonTimePicker = (Button) findViewById(R.id.button_timepicker); buttonTimePicker.setOnClickListener(listener); // 通过Calendar获取模拟器的当前时间 final Calendar c = Calendar.getInstance(); mHour = c.get(Calendar.HOUR_OF_DAY); mMinute = c.get(Calendar.MINUTE); // 显示当前模拟器的时间 timePickerDisplay.setText(new StringBuilder().append(pad(mHour)) .append(":").append(pad(mMinute))); } private OnClickListener listener = new OnClickListener() { public void onClick(View v) { DialogFragment fragment = new MyDialogFragment(); fragment.show(getFragmentManager(), "datePicker"); } }; // 设置显示格式 private static String pad(int c) { return (c >= 10) ? String.valueOf(c) : "0" + String.valueOf(c); } // 使用内部类来实现 class MyDialogFragment extends DialogFragment { public Dialog onCreateDialog(int id) { switch (id) { case TIME_DIALOG_ID: return new TimePickerDialog(getActivity(), mTimeSetListener, mHour, mMinute, true); } return null; } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { return new TimePickerDialog(getActivity(), mTimeSetListener, mHour, mMinute, true); } private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() { public void onTimeSet(TimePicker view, int hourOfDay, int minute) { timePickerDisplay .setText(new StringBuilder().append(pad(hourOfDay)) .append(":").append(pad(minute))); } }; }}
第一种方式为:
MainActivity.java:
package com.process.processbar;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.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.TimePicker;public class MainActivity extends Activity { private TextView timePickerDisplay; private Button buttonTimePicker; private int mHour; // 设置小时 private int mMinute; // 设置分钟 static final int TIME_DIALOG_ID = 0; // 对话框的ID @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); timePickerDisplay = (TextView) findViewById(R.id.timepicker_display); buttonTimePicker = (Button) findViewById(R.id.button_timepicker); buttonTimePicker.setOnClickListener(listener); // 通过Calendar获取模拟器的当前时间 final Calendar c = Calendar.getInstance(); mHour = c.get(Calendar.HOUR_OF_DAY); mMinute = c.get(Calendar.MINUTE); // 显示当前模拟器的时间 timePickerDisplay.setText(new StringBuilder().append(pad(mHour)) .append(":").append(pad(mMinute))); } private OnClickListener listener = new OnClickListener() { public void onClick(View v) { showDialog(TIME_DIALOG_ID); // 方法已过期 } }; // 设置显示时间 private static String pad(int c) { return (c >= 10) ? String.valueOf(c) : "0" + String.valueOf(c); } // 监听器 private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() { public void onTimeSet(TimePicker view, int hourOfDay, int minute) { timePickerDisplay.setText(new StringBuilder() .append(pad(hourOfDay)).append(":").append(pad(minute))); } }; // 调用showDialog时,会调用onCreateDialog方法,我们需要重写这个方法,在该方法中创建一个Dialog; @Override protected Dialog onCreateDialog(int id) { switch (id) { case TIME_DIALOG_ID: return new TimePickerDialog(this, mTimeSetListener, mHour, mMinute, true); } return null; }}
需注意:showDialog方法已过期,虽然还可以用,但官方建议使用第二种方式来替代showDialog;
android 通过TimePickerDialog修改时间
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