在使用 android studio 和 firebase 時(shí)，我的應(yīng)用程序（在后臺(tái)或前臺(tái)）在點(diǎn)擊通知時(shí)在 API 26 設(shè)備上崩潰。而當(dāng)我使用 API 23 設(shè)備時(shí)，當(dāng)應(yīng)用程序關(guān)閉并單擊通知時(shí)應(yīng)用程序崩潰，但當(dāng)應(yīng)用程序處于后臺(tái)/前臺(tái)時(shí)仍可以處理通知。我不明白這個(gè)問(wèn)題，任何幫助表示贊賞。通知服務(wù)import android.app.NotificationManager;import android.app.PendingIntent;import android.content.Intent;import android.support.v4.app.NotificationCompat;import com.google.firebase.messaging.RemoteMessage;public class FirebaseMessagingService extends com.google.firebase.messaging.FirebaseMessagingService {    @Override    public void onMessageReceived(RemoteMessage remoteMessage) {        super.onMessageReceived(remoteMessage);        String notification_title = remoteMessage.getNotification().getTitle();        String notification_message = remoteMessage.getNotification().getBody();        String click_action = remoteMessage.getNotification().getClickAction();        String from_user_id = remoteMessage.getData().get("from_user_id");        NotificationCompat.Builder mBuilder =                new NotificationCompat.Builder(FirebaseMessagingService.this, "default")                        .setSmallIcon(R.mipmap.ic_launcher)                        .setContentTitle(notification_title)                        .setContentText(notification_message);        Intent resultIntent = new Intent(click_action);        resultIntent.putExtra("user_id", from_user_id);        PendingIntent resultPendingIntent =                PendingIntent.getActivity(                        FirebaseMessagingService.this,                        0,                        resultIntent,                        PendingIntent.FLAG_UPDATE_CURRENT                );        mBuilder.setContentIntent(resultPendingIntent);        int mNotificationId = (int) System.currentTimeMillis();        NotificationManager mNotifyMgr =                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);        mNotifyMgr.notify(mNotificationId, mBuilder.build());    }}