是的，AWS Pinpoint支持通知中心和应用内消息。以下是一个示例代码，使用AWS SDK for Java来发送应用内消息：

import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.pinpoint.AmazonPinpoint;
import com.amazonaws.services.pinpoint.AmazonPinpointClientBuilder;
import com.amazonaws.services.pinpoint.model.*;
import java.util.HashMap;
import java.util.Map;

public class PinpointAppMessaging {
    public static void main(String[] args) {
        String appId = "YOUR_PINPOINT_APP_ID";
        String apiKey = "YOUR_PINPOINT_API_KEY";
        String region = "YOUR_PINPOINT_REGION";
        
        // 设置AWS凭证
        BasicAWSCredentials credentials = new BasicAWSCredentials(apiKey, apiKey);
        
        // 创建Pinpoint客户端
        AmazonPinpoint client = AmazonPinpointClientBuilder.standard()
                .withCredentials(new AWSStaticCredentialsProvider(credentials))
                .withRegion(region)
                .build();
        
        // 创建应用内消息请求
        SendMessagesRequest request = new SendMessagesRequest()
                .withApplicationId(appId)
                .withMessageRequest(new MessageRequest()
                        .withAddresses(getEndpointAddress())
                        .withMessageConfiguration(new DirectMessageConfiguration()
                                .withGCMMessage(new GCMMessage()
                                        .withData(getMessageData())
                                        .withNotification(new NotificationConfig()
                                                .withTitle("Notification Title")
                                                .withBody("Notification Body"))))));
        
        // 发送应用内消息
        SendMessagesResult result = client.sendMessages(request);
        
        // 输出发送结果
        System.out.println("Message sent. Result: " + result);
    }
    
    // 创建终端地址
    private static Map getEndpointAddress() {
        Map addresses = new HashMap<>();
        
        // 添加终端地址
        addresses.put("YOUR_ENDPOINT_ID", new AddressConfiguration()
                .withChannelType(ChannelType.GCM)
                .withAddress("YOUR_DEVICE_TOKEN"));
        
        return addresses;
    }
    
    // 创建应用内消息数据
    private static Map getMessageData() {
        Map data = new HashMap<>();
        
        // 添加消息数据
        data.put("key1", "value1");
        data.put("key2", "value2");
        
        return data;
    }
}

请注意替换代码中的YOUR_PINPOINT_APP_ID，YOUR_PINPOINT_API_KEY，YOUR_PINPOINT_REGION，YOUR_ENDPOINT_ID和YOUR_DEVICE_TOKEN为实际的值。此外，您还可以根据需要自定义应用内消息的标题和正文，以及添加其他消息数据。