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我有一个很大或很小的问题，我想显示具体的消息por我的每个订单把它需要一个，并为他们三个打印它，当我打开这里的活动时出现推送通知是我的代码从Java和XML活动TextView不显示Firebase中的内容，推送通知仅在活动中起作用？
public class MessageActivity extends AppCompatActivity {
public TextView message;
private DatabaseReference mDatabase;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
mDatabase = FirebaseDatabase.getInstance().getReference().child("users").child("paid").child(FirebaseAuth.getInstance().getCurrentUser().getUid());
message = findViewById(R.id.message);
mDatabase.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot areaSnapshot : dataSnapshot.getChildren()) {
DetailCart detail = areaSnapshot.getValue(DetailCart.class);
String mess = detail.getMessage();
message.setText(mess);
NotificationManager notif=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
Notification notify=new Notification.Builder
(getApplicationContext()).setContentTitle(mess).setContentText(mess).
setContentTitle(mess).setSmallIcon(R.drawable.ic_person).build();
notify.flags |= Notification.FLAG_AUTO_CANCEL;
notif.notify(0, notify);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
// [START_EXCLUDE]
System.out.println("The read failed: " + databaseError.getMessage());
}
});
}
}
这是布局代码：
<TextView
android:id="@+id/message"
android:textSize="20dp"
android:layout_marginBottom="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Message"
android:textColor="@android:color/holo_blue_dark"
android:textColorHighlight="@android:color/primary_text_dark" />