Android 通知的意图未正确发送到其他活动

Android 通知的意图未正确发送到其他活动,android,android-intent,notifications,android-pendingintent,Android,Android Intent,Notifications,Android Pendingintent,我试图在通知的意图中添加一个额外的内容,以便打开聊天活动,与给我发消息的用户进行对话。我传递给NotificationsListener的用户不为null。问题是,无论我尝试了什么其他调整,我总是会遇到这个错误: 2021-04-27 21:46:57.679 13553-13553/com.example.videomeeting E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.videomeeting, PID

我试图在通知的意图中添加一个额外的内容,以便打开聊天活动,与给我发消息的用户进行对话。我传递给NotificationsListener的用户不为null。问题是,无论我尝试了什么其他调整,我总是会遇到这个错误:

2021-04-27 21:46:57.679 13553-13553/com.example.videomeeting E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.videomeeting, PID: 13553
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.videomeeting/com.example.videomeeting.activities.ChatActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.videomeeting.models.User.getUserName()' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3431)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3595)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7660)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.videomeeting.models.User.getUserName()' on a null object reference
        at com.example.videomeeting.activities.ChatActivity.onCreate(ChatActivity.java:108)
        at android.app.Activity.performCreate(Activity.java:8000)
        at android.app.Activity.performCreate(Activity.java:7984)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3404)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3595) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:223) 
        at android.app.ActivityThread.main(ActivityThread.java:7660) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 
代码如下:

NotificationsListener.java

@Override
    public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        Intent activityIntent = new Intent(this, ChatActivity.class);
            FirebaseDatabase.getInstance().getReference(KEY_COLLECTION_USERS)
                    .child(remoteMessage.getData().get(KEY_USER_ID))
                    .addValueEventListener(new ValueEventListener() {
                        @Override
                        public void onDataChange(@NonNull DataSnapshot snapshot) {
                            user = snapshot.getValue(User.class);
                        }

                        @Override
                        public void onCancelled(@NonNull DatabaseError error) { }
                    });
            activityIntent.putExtra(Constants.INTENT_USER, user);
            activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_CLEAR_TASK);
            PendingIntent contentIntent = PendingIntent.getActivity(
                    this,
                    0,
                    activityIntent,
                    FLAG_UPDATE_CURRENT
            );
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat);

        processExtraData();

        //Toolbar
        Toolbar toolbar = findViewById(R.id.toolbar);
        toolbar.setTitle("");
        setSupportActionBar(toolbar);

        TextView usernameTV = findViewById(R.id.usernameTV);
        usernameTV.setText(remoteUser.getUserName()); //ERROR LINE
ChatActivity.java

@Override
    public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        Intent activityIntent = new Intent(this, ChatActivity.class);
            FirebaseDatabase.getInstance().getReference(KEY_COLLECTION_USERS)
                    .child(remoteMessage.getData().get(KEY_USER_ID))
                    .addValueEventListener(new ValueEventListener() {
                        @Override
                        public void onDataChange(@NonNull DataSnapshot snapshot) {
                            user = snapshot.getValue(User.class);
                        }

                        @Override
                        public void onCancelled(@NonNull DatabaseError error) { }
                    });
            activityIntent.putExtra(Constants.INTENT_USER, user);
            activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_CLEAR_TASK);
            PendingIntent contentIntent = PendingIntent.getActivity(
                    this,
                    0,
                    activityIntent,
                    FLAG_UPDATE_CURRENT
            );
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat);

        processExtraData();

        //Toolbar
        Toolbar toolbar = findViewById(R.id.toolbar);
        toolbar.setTitle("");
        setSupportActionBar(toolbar);

        TextView usernameTV = findViewById(R.id.usernameTV);
        usernameTV.setText(remoteUser.getUserName()); //ERROR LINE

我已经检查了通知接收者意图中的额外内容是否为空,是否为空。一定有一个细节我没有看到。谢谢您的时间。

错误消息清楚地表明remoteUser尚未初始化或为null,您需要检查processExtraData()方法正在接收哪些数据,然后


如果(用户)getIntent().getSerializableExtra(INTENT\u用户)未返回用户,则问题出在NotificationsListener类中。首先,请确保传递给活动的用户不为null。我认为,
onDataChange
会在您将用户作为额外用户传递后触发。我认为它可能会对您有所帮助,如果没有,请查看和。

谢谢大家,我只是在onDataChange中跟踪用户的值,这是不正确的,因为他的异步性。我进行此修复是为了避免空值:

while(!isFound) {
      FirebaseDatabase.getInstance().getReference(KEY_COLLECTION_USERS)
              .child(remoteMessage.getData().get(KEY_USER_ID))
              .addValueEventListener(new ValueEventListener() {
                      @Override
                      public void onDataChange(@NonNull DataSnapshot snapshot) {
                           user = snapshot.getValue(User.class);
                           isFound = true;
                      }

                      @Override
                      public void onCancelled(@NonNull DatabaseError error) {
                      }
             });
}
再次感谢。真的很感激