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；