我创建了一个有聊天功能的应用程序,当用户发送消息时,它会向接收者显示一个通知。
现在,我想,当用户收到通知并点击它时,它将打开所有功能的活动。
我做的通知看起来像这样。
public void notifyThis(String title, String message, String uniqueID, String var1, String var2, String var3) {
Intent intent = new Intent(this, ChatActivity.class);
intent.putExtra("ChatID",var1);
intent.putExtra("ReceiverID",var2);
intent.putExtra("SenderID",var3);
int RandomID = (int) System.currentTimeMillis();
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
NotificationCompat.Builder groupBuilder = new NotificationCompat.Builder(this,"191919")
.setSmallIcon(R.drawable.ic_launcher_custom_background)
.setGroup(uniqueID)
.setGroupSummary(true);
NotificationCompat.Builder messageBuilder = new NotificationCompat.Builder(this, "191919")
.setSmallIcon(R.drawable.ic_launcher_custom_background)
.setContentTitle(title)
.setContentText(message)
.setContentIntent(pendingIntent)
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setGroup( uniqueID )
.setAutoCancel( true );
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
notificationManager.notify(uniqueID,0, groupBuilder.build());
notificationManager.notify(RandomID, messageBuilder.build());
}
到目前为止,一切都很正常,当我调试时,我看到: var1, var2, var3
不是空的,是存在的。
我的问题是,当我点击通知时,应用程序崩溃,因为它说。
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
但我不明白为什么它的SenderID是空的 如果通知的意图是用值发送的,如果我这样读它。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_chat );
getSupportActionBar().hide();
auth = FirebaseAuth.getInstance();
chatID = getIntent().getExtras().getString( "ChatID" );
receiverID = getIntent().getExtras().getString( "ReceiverID" );
SenderID = getIntent().getExtras().getString("SenderID");
if (SenderID.equals( auth.getUid() )) { HERE I GET THE ERROR SAYING SenderID IS NULL
NotMyID = receiverID;
} else {
NotMyID = SenderID;
}
}
我是不是读错了什么?根据我的理解,我在我的通知意图中发送了SenderID,然后我 getExtras
从这个意图来看,它应该是工作的。
谢谢你
只要对notifyThis功能做一些修改。
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);