android基础组件---->Picker的使用

　　Android为提供了一个随时可用的对话框，方便用户选取时间或者日期。今天我们就简单的学习一下Picker的使用。我们的爱，比死亡还要理所当然。

 

Picker的使用

项目结构如下：

 

一、创建一个Time Picker

创建一个TimePickerFragment

class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        String time = hourOfDay + ":" + minute;
        timeView.setText(time);
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar calendar = Calendar.getInstance();
        int hours = calendar.get(Calendar.HOUR_OF_DAY);
        int minutes = calendar.get(Calendar.MINUTE);

        return new TimePickerDialog(getActivity(), this, hours, minutes, DateFormat.is24HourFormat(getActivity()));
    }
}

在mainActivity中使用：

// 显示时间的picker
public void showTimePickerDialog(View v) {
    DialogFragment newFragment = new TimePickerFragment();
    newFragment.show(getFragmentManager(), "timePicker");
}

 

二、创建一个Date Picker

创建一个DatePickerFragment

class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        String date = year + "-" + month + "-" + day;
        dateView.setText(date);
    }
}

在mainActivity中使用：

// 显示日期的picker
public void showDatePickerDialog(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getFragmentManager(), "datePicker");
}

上述的运行效果如下：

 

三、测试的完整代码

 MainActivity.java

package com.huhx.linux.pickertest;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.format.DateFormat;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {
    private TextView timeView;
    private TextView dateView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        timeView = (TextView) findViewById(R.id.time);
        dateView = (TextView) findViewById(R.id.date);
    }

    // 显示时间的picker
    public void showTimePickerDialog(View v) {
        DialogFragment newFragment = new TimePickerFragment();
        newFragment.show(getFragmentManager(), "timePicker");
    }

    // 显示日期的picker
    public void showDatePickerDialog(View v) {
        DialogFragment newFragment = new DatePickerFragment();
        newFragment.show(getFragmentManager(), "datePicker");
    }

    class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            final Calendar c = Calendar.getInstance();
            int year = c.get(Calendar.YEAR);
            int month = c.get(Calendar.MONTH);
            int day = c.get(Calendar.DAY_OF_MONTH);

            return new DatePickerDialog(getActivity(), this, year, month, day);
        }

        public void onDateSet(DatePicker view, int year, int month, int day) {
            String date = year + "-" + month + "-" + day;
            dateView.setText(date);
        }
    }

    class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
        @Override
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            String time = hourOfDay + ":" + minute;
            timeView.setText(time);
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            final Calendar calendar = Calendar.getInstance();
            int hours = calendar.get(Calendar.HOUR_OF_DAY);
            int minutes = calendar.get(Calendar.MINUTE);

            return new TimePickerDialog(getActivity(), this, hours, minutes, DateFormat.is24HourFormat(getActivity()));
        }
    }
}

 activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.huhx.linux.pickertest.MainActivity">

    <TextView
        android:id="@+id/time"
        android:text="time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:text="date"
        android:id="@+id/date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="showTimePickerDialog"
        android:text="picker time" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="showDatePickerDialog"
        android:text="picker date" />
</LinearLayout>