如何在 Android 中创建提醒通知？

此示例演示了如何在 Android 中创建提醒通知。

步骤 1 - 在 Android Studio 中创建一个新项目，转到文件 ⇒ 新建项目，并填写所有必需的详细信息以创建新项目。

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"
   android:padding = "16dp"
   tools:context = ".MainActivity">
   <Button
      android:onClick= "createNotification"
      android:text= "create notification"
      android:layout_centerInParent= "true"
      android:layout_width= "match_parent"
      android:layout_height= "wrap_content" />
</RelativeLayout>

步骤 3 - 将以下代码添加到 src/MainActivity 中。

package app.tutorialspoint.com.notifyme ;
import android.app.AlarmManager ;
import android.app.PendingIntent ;
import android.content.Intent ;
import android.os.Bundle ;
import android.support.v7.app.AppCompatActivity ;
import android.view.View ;
import java.util.Calendar ;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate (Bundle savedInstanceState) {
      super .onCreate(savedInstanceState) ;
      setContentView(R.layout. activity_main ) ;
   }
   public void createNotification (View view) {
      Intent myIntent = new Intent(getApplicationContext() , NotifyService. class ) ;
      AlarmManager alarmManager = (AlarmManager) getSystemService( ALARM_SERVICE ) ;
      PendingIntent pendingIntent = PendingIntent. getService ( this, 0 , myIntent , 0 ) ;
      Calendar calendar = Calendar. getInstance () ;
      calendar.set(Calendar. SECOND , 0 ) ;
      calendar.set(Calendar. MINUTE , 0 ) ;
      calendar.set(Calendar. HOUR , 0 ) ;
      calendar.set(Calendar. AM_PM , Calendar. AM ) ;
      calendar.add(Calendar. DAY_OF_MONTH , 1 ) ;
      alarmManager.setRepeating(AlarmManager. RTC_WAKEUP , calendar.getTimeInMillis() , 1000 * 60 * 60 * 24 , pendingIntent) ;
   }
}

步骤 4 - 将以下代码添加到 src/NotifyService 中。

package app.tutorialspoint.com.notifyme ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.app.PendingIntent ;
import android.app.Service ;
import android.content.Intent ;
import android.os.IBinder ;
import android.support.v4.app.NotificationCompat ;
public class NotifyService extends Service {
   public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
   private final static String default_notification_channel_id = "default" ;
   public NotifyService () {
   }
   @Override
   public IBinder onBind (Intent intent) {
      Intent notificationIntent = new Intent(getApplicationContext() ,  MainActivity. class ) ;
      notificationIntent.putExtra( "fromNotification" , true ) ;
      notificationIntent.setFlags(Intent. FLAG_ACTIVITY_CLEAR_TOP | Intent. FLAG_ACTIVITY_SINGLE_TOP ) ;
      PendingIntent pendingIntent = PendingIntent. getActivity ( this, 0 , notificationIntent , 0 ) ;
      NotificationManager mNotificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE ) ;
      NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext() , default_notification_channel_id ) ;
      mBuilder.setContentTitle( "My Notification" ) ;
      mBuilder.setContentIntent(pendingIntent) ;
      mBuilder.setContentText( "Notification Listener Service Example" ) ;
      mBuilder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
      mBuilder.setAutoCancel( true ) ;
      if (android.os.Build.VERSION. SDK_INT >= android.os.Build.VERSION_CODES. O ) {
         int importance = NotificationManager. IMPORTANCE_HIGH ;
         NotificationChannel notificationChannel = new
         NotificationChannel( NOTIFICATION_CHANNEL_ID , "NOTIFICATION_CHANNEL_NAME" , importance) ;
         mBuilder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
         assert mNotificationManager != null;
         mNotificationManager.createNotificationChannel(notificationChannel) ;
      }
      assert mNotificationManager != null;
      mNotificationManager.notify(( int ) System. currentTimeMillis () , mBuilder.build()) ;
      throw new UnsupportedOperationException( "Not yet implemented" ) ;
   }
}

步骤 5 - 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.tutorialspoint.com.notifyme" >
   <uses-permission android :name = "android.permission.VIBRATE" />
   <uses-permission android :name = "android.permission.RECEIVE_BOOT_COMPLETED" />
   <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" >
      <service
         android :name = ".NotifyService"
         android :enabled = "true"
         android :exported = "true" >
      </service>
      <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>

让我们尝试运行您的应用程序。我假设您已将您的实际 Android 移动设备连接到您的计算机。要从 Android Studio 运行应用程序，请打开项目的活动文件之一，然后点击工具栏中的运行图标。选择您的移动设备作为选项，然后检查您的移动设备，它将显示您的默认屏幕。