如何使用NotificationCompat创建通知。建设者

Question

我需要创建一个简单的通知，这将显示在通知栏随着声音和图标，如果可能的话？我也需要它与Android 2.2兼容，所以我发现NotificationCompat.Builder适用于4以上的所有API。如果有更好的解决方案，请随时提及。

Answer 1

在android 8.0中显示通知

@TargetApi(Build.VERSION_CODES.O)
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)

  public void show_Notification(){

    Intent intent=new Intent(getApplicationContext(),MainActivity.class);
    String CHANNEL_ID="MYCHANNEL";
    NotificationChannel notificationChannel=new NotificationChannel(CHANNEL_ID,"name",NotificationManager.IMPORTANCE_LOW);
    PendingIntent pendingIntent=PendingIntent.getActivity(getApplicationContext(),1,intent,0);
    Notification notification=new Notification.Builder(getApplicationContext(),CHANNEL_ID)
            .setContentText("Heading")
            .setContentTitle("subheading")
            .setContentIntent(pendingIntent)
            .addAction(android.R.drawable.sym_action_chat,"Title",pendingIntent)
            .setChannelId(CHANNEL_ID)
            .setSmallIcon(android.R.drawable.sym_action_chat)
            .build();

    NotificationManager notificationManager=(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.createNotificationChannel(notificationChannel);
    notificationManager.notify(1,notification);


}

Answer 2

工作示例：

    Intent intent = new Intent(ctx, HomeActivity.class);
    PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder b = new NotificationCompat.Builder(ctx);

    b.setAutoCancel(true)
     .setDefaults(Notification.DEFAULT_ALL)
     .setWhen(System.currentTimeMillis())         
     .setSmallIcon(R.drawable.ic_launcher)
     .setTicker("Hearty365")            
     .setContentTitle("Default notification")
     .setContentText("Lorem ipsum dolor sit amet, consectetur adipiscing elit.")
     .setDefaults(Notification.DEFAULT_LIGHTS| Notification.DEFAULT_SOUND)
     .setContentIntent(contentIntent)
     .setContentInfo("Info");


    NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(1, b.build());

Answer 3

通知人。Builder是在所有Android版本上创建通知的最简单方法。您甚至可以使用Android 4.1提供的功能。如果您的应用程序在Android设备上运行

要创建简单的通知，只需执行以下操作（请参阅Android API通知指南）：

NotificationCompat.Builder mBuilder =
    new NotificationCompat.Builder(this)
    .setSmallIcon(R.drawable.notification_icon)
    .setContentTitle("My notification")
    .setContentText("Hello World!")
    .setContentIntent(pendingIntent); //Required on Gingerbread and below

您必须至少设置smallIcon、contentTitle和contentText。如果您错过了一个，通知将不会显示。

注意：在姜饼和下面，您必须设置内容意图，否则将抛出IllegalArgumentExc0019。

要创建不起任何作用的意图，请使用：

final Intent emptyIntent = new Intent();
PendingIntent pendingIntent = PendingIntent.getActivity(ctx, NOT_USED, emptyIntent, PendingIntent.FLAG_UPDATE_CURRENT);

您可以通过构建器添加声音，即RingtoneManager中的声音：

mBuilder.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))

通知通过NotificationManager添加到栏中：

NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(mId, mBuilder.build());