Android 应用中根据当前Activity状态动态控制推送通知显示

public class NotificationHelper {
   public static boolean shouldShowNotification = true;
}

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

public class ChatActivity extends AppCompatActivity { // 假设这是您的聊天界面Activity

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 设置您的布局
        // setContentView(R.layout.activity_chat);
    }

    @Override
    protected void onResume() {
        super.onResume();
        // 当Activity可见并处于前台时，禁用通知显示
        NotificationHelper.shouldShowNotification = false; 
    }

    @Override
    protected void onPause() {
        super.onPause();
        // 当Activity不再处于前台时，重新启用通知显示
        // 这确保了当用户离开聊天界面后，其他消息通知能够正常弹出
        NotificationHelper.shouldShowNotification = true; 
    }
}

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Build;
import android.provider.Settings;
import androidx.annotation.NonNull;
import androidx.core.app.NotificationCompat;
import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;
import java.util.Objects;

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    @Override
    public void onMessageReceived(@NonNull RemoteMessage message) {
        super.onMessageReceived(message);

        // 核心：在显示通知前检查全局标志
        if (NotificationHelper.shouldShowNotification) {
            int requestID = (int) System.currentTimeMillis();

            String title = message.getNotification().getTitle();
            String body = message.getNotification().getBody();
            String click_action = message.getNotification().getClickAction();

            NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext(), "Notification");
            builder.setContentTitle(title);
            builder.setContentText(body);
            builder.setSound(Settings.System.DEFAULT_NOTIFICATION_URI);
            builder.setVibrate(new long[]{1000, 1000, 1000, 1000, 1000});
            // 确保R.color.chitchat存在于您的项目中
            // builder.setLights(getResources().getColor(R.color.chitchat), 3000, 3000); 
            builder.setSmallIcon(R.drawable.logowhite); // 确保R.drawable.logowhite存在

            Intent intent = null;

            if (Objects.requireNonNull(message.getData().get("type")).equalsIgnoreCase("privatechat")) {
                intent = new Intent(click_action);
                // 确保您的click_action与Manifest中的Activity intent-filter匹配
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
                intent.putExtra("GCKey", message.getData().get("GCKey"));
                intent.putExtra("GCNameKey", message.getData().get("GCNameKey"));
            }

            // 确保 intent 不为 null，否则 PendingIntent 会抛出异常
            if (intent == null) {
                // 如果没有匹配的type，可以创建一个默认的intent，或者直接返回不显示通知
                intent = new Intent(this, MainActivity.class); // 示例：跳转到主Activity
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
            }

            PendingIntent pendingIntent = PendingIntent.getActivity(this, requestID, intent, PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
            builder.setAutoCancel(true);
            builder.setContentIntent(pendingIntent);

            NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                NotificationChannel channel = new NotificationChannel("Notification", "Default channel", NotificationManager.IMPORTANCE_DEFAULT);
                notificationManager.createNotificationChannel(channel);
            }
            notificationManager.notify(69, builder.build());
        }
    }
}