如何在 Android 中使用日期时间选取器?
本示例演示如何在 Android 中使用日期和时间选取器。
步骤 1 − 在 Android Studio 中创建新项目,转到文件⇒ 新项目,并填写所有必需的详细信息来创建新项目。
步骤 2 − 将以下代码添加到 res/layout/activity_main.xml 中。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" tools:context=".MainActivity"> <Button android:id="@+id/btnPick" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginTop="30dp" android:text="Pick Date and TIme"/> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textSize="16sp" android:textStyle="bold"/> </RelativeLayout>
步骤 3 − 将以下代码添加到 src/MainActivity.java 中
import android.app.DatePickerDialog; import android.app.TimePickerDialog; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.text.format.DateFormat; import android.view.View; import android.widget.Button; import android.widget.DatePicker; import android.widget.TextView; import android.widget.TimePicker; import java.util.Calendar; public class MainActivity extends AppCompatActivity implements DatePickerDialog.OnDateSetListener, TimePickerDialog.OnTimeSetListener { TextView textView; Button button; int day, month, year, hour, minute; int myday, myMonth, myYear, myHour, myMinute; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = findViewById(R.id.textView); button = findViewById(R.id.btnPick); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Calendar calendar = Calendar.getInstance(); year = calendar.get(Calendar.YEAR); month = calendar.get(Calendar.MONTH); day = calendar.get(Calendar.DAY_OF_MONTH); DatePickerDialog datePickerDialog = new DatePickerDialog(MainActivity.this, MainActivity.this,year, month,day); datePickerDialog.show(); } }); } @Override public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) { myYear = year; myday = day; myMonth = month; Calendar c = Calendar.getInstance(); hour = c.get(Calendar.HOUR); minute = c.get(Calendar.MINUTE); TimePickerDialog timePickerDialog = new TimePickerDialog(MainActivity.this, MainActivity.this, hour, minute, DateFormat.is24HourFormat(this)); timePickerDialog.show(); } @Override public void onTimeSet(TimePicker view, int hourOfDay, int minute) { myHour = hourOfDay; myMinute = minute; textView.setText("Year: " + myYear + "
" + "Month: " + myMonth + "
" + "Day: " + myday + "
" + "Hour: " + myHour + "
" + "Minute: " + myMinute); } }
步骤 4 − 将以下代码添加到 androidManifest.xml 中
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行你的应用程序。我假设你已将实际的 Android 移动设备与你的计算机连接起来。要从 android studio 运行应用程序,请打开项目中的一个活动文件,然后单击工具栏中的运行 图标。选择你的移动设备作为选项,然后查看将显示你的默认屏幕的移动设备 –
单击 此处 下载项目代码。
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