android实现具有日程提醒功能的代码和布局文件

以下是一个简单的实现具有日程提醒功能的 Android 应用程序的代码和布局文件：

布局文件（schedule_layout.xml）：

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

   <TextView
       android:id="@+id/title_textview"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="Schedule Reminder"
       android:textSize="24sp"
       android:padding="16dp"
       android:gravity="center"/>

   <EditText
       android:id="@+id/event_edittext"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="Enter your event here"
       android:padding="16dp"/>

   <EditText
       android:id="@+id/date_edittext"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="Enter date (MM/DD/YYYY)"
       android:padding="16dp"/>

   <EditText
       android:id="@+id/time_edittext"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="Enter time (HH:MM AM/PM)"
       android:padding="16dp"/>

   <Button
       android:id="@+id/add_button"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Add Reminder"
       android:layout_gravity="center"
       android:padding="16dp"/>

</LinearLayout>

Java 代码（ScheduleActivity.java）：

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class ScheduleActivity extends AppCompatActivity {

   private EditText mEventEditText;
   private EditText mDateEditText;
   private EditText mTimeEditText;
   private Button mAddButton;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.schedule_layout);

       mEventEditText = findViewById(R.id.event_edittext);
       mDateEditText = findViewById(R.id.date_edittext);
       mTimeEditText = findViewById(R.id.time_edittext);
       mAddButton = findViewById(R.id.add_button);

       mAddButton.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               String event = mEventEditText.getText().toString().trim();
               String date = mDateEditText.getText().toString().trim();
               String time = mTimeEditText.getText().toString().trim();

               if (TextUtils.isEmpty(event)) {
                   Toast.makeText(ScheduleActivity.this, "Please enter an event", Toast.LENGTH_SHORT).show();
                   return;
               }

               if (TextUtils.isEmpty(date)) {
                   Toast.makeText(ScheduleActivity.this, "Please enter a date", Toast.LENGTH_SHORT).show();
                   return;
               }

               if (TextUtils.isEmpty(time)) {
                   Toast.makeText(ScheduleActivity.this, "Please enter a time", Toast.LENGTH_SHORT).show();
                   return;
               }

               String dateTime = date + " " + time;
               SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy hh:mm a");
               Date reminderDate = null;

               try {
                   reminderDate = dateFormat.parse(dateTime);
               } catch (ParseException e) {
                   e.printStackTrace();
                   Toast.makeText(ScheduleActivity.this, "Invalid date/time format", Toast.LENGTH_SHORT).show();
                   return;
               }

               Calendar calendar = Calendar.getInstance();
               calendar.setTime(reminderDate);

               Intent intent = new Intent(ScheduleActivity.this, ReminderBroadcastReceiver.class);
               intent.putExtra("event", event);

               PendingIntent pendingIntent = PendingIntent.getBroadcast(ScheduleActivity.this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
               AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
               alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

               Toast.makeText(ScheduleActivity.this, "Reminder set for " + DateFormat.getDateTimeInstance().format(calendar.getTime()), Toast.LENGTH_LONG).show();
           }
       });
   }
}

此示例使用 AlarmManager 和 BroadcastReceiver 来设置提醒。您需要创建一个 BroadcastReceiver 类（在这个示例中称为 ReminderBroadcastReceiver），并在 AndroidManifest.xml 文件中声明它。您可以在 BroadcastReceiver 中定义提醒的外观和行为。在 AndroidManifest.xml 文件中，您还需要添加相应的权限：

<uses-permission android:name="android.permission.VIBRATE"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

<receiver android:name=".ReminderBroadcastReceiver"/>

以下是 ReminderBroadcastReceiver 的示例代码：

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.RingtoneManager;
import android.net.Uri;

import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;

public class ReminderBroadcastReceiver extends BroadcastReceiver {

   private static final String CHANNEL_ID = "CHANNEL_ID";
   private static final int NOTIFICATION_ID = 1;

   @Override
   public void onReceive(Context context, Intent intent) {
       String event = intent.getStringExtra("event");

       Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
       NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
               .setSmallIcon(R.drawable.ic_notification)
               .setContentTitle("Reminder: " + event)
               .setContentText("Your scheduled event is happening now!")
               .setPriority(NotificationCompat.PRIORITY_HIGH)
               .setSound(soundUri)
               .setVibrate(new long[] {0, 1000, 1000, 1000})
               .setAutoCancel(true);

       NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
       notificationManager.notify(NOTIFICATION_ID, builder.build());
   }
}

这个 BroadcastReceiver 在接收到广播时创建一个通知。您可以根据需要自定义通知的外观和行为。