如何在 Android 中使用按钮进行多项操作

Question

我有一个电子商务应用程序，通过单击确认订单按钮，我需要显示通知并下订单以及向客户发送邮件。 我已经这样做了，但不知道它是否有效。 任何人都可以在这件事上提供帮助吗？ 我将分享下面的代码。

公共 class confirmActivity 扩展 AppCompatActivity {

private EditText nameEditText, phoneEditText,emailEditText, addressEditText, cityEditText;
private Button confirmOrderbtn;
private String totalAmount = "";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_confirm);
    totalAmount = getIntent().getStringExtra("Total Price");

    confirmOrderbtn = (Button) findViewById(R.id.confirm_final_order_btn);
    nameEditText = (EditText) findViewById(R.id.shipment_name);
    phoneEditText = (EditText) findViewById(R.id.shipment_phone);
    emailEditText = (EditText) findViewById(R.id.shipment_email);
    addressEditText = (EditText) findViewById(R.id.shipment_address);
    cityEditText = (EditText) findViewById(R.id.shipment_city);

    confirmOrderbtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            check();


        }
    });


}




private void check() {
    if (TextUtils.isEmpty(nameEditText.getText().toString())) {
        Toast.makeText(this, "Please provide your full name", Toast.LENGTH_LONG).show();
    } else if (TextUtils.isEmpty(phoneEditText.getText().toString())) {
        Toast.makeText(this, "Please provide your Phone number", Toast.LENGTH_LONG).show();
    }
    else if (TextUtils.isEmpty(emailEditText.getText().toString())) {
        Toast.makeText(this, "Please provide your Email id", Toast.LENGTH_LONG).show();
    }
    else if (TextUtils.isEmpty(addressEditText.getText().toString()))
    {
        Toast.makeText(this, "Please provide your Address", Toast.LENGTH_LONG).show();
    } else if (TextUtils.isEmpty(cityEditText.getText().toString())) {
        Toast.makeText(this, "Please provide your city", Toast.LENGTH_LONG).show();
    } else {
        ConfirmOrder();
        addNotification();
    }

}
private void addNotification() {

    NotificationCompat.Builder builder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.bell) //set icon for notification
                    .setContentTitle("Order Placed") //set title of notification
                    .setContentText("Thank you")//this is notification message
                    .setAutoCancel(true) // makes auto cancel of notification
                    .setPriority(NotificationCompat.PRIORITY_DEFAULT); //set priority of notification


    Intent notificationIntent = new Intent(this, NotificationView.class);
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    //notification message will get at NotificationView
    notificationIntent.putExtra("message", "Thank you");

    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(pendingIntent);

    // Add as notification
    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, builder.build());
}


private void ConfirmOrder() {
    final String saveCurrentTime, saveCurrentDate;
    Calendar CallForDate = Calendar.getInstance();
    SimpleDateFormat currentDate = new SimpleDateFormat("MMM dd,yyyy");
    saveCurrentDate = currentDate.format(CallForDate.getTime());

    SimpleDateFormat currentTime = new SimpleDateFormat("HH:mm:ss a");
    saveCurrentTime = currentDate.format(CallForDate.getTime());

    final DatabaseReference ordersRef = FirebaseDatabase.getInstance().getReference().child("Orders")
            .child(Prevalent.currentOnlineUser.getPhone());
    HashMap<String, Object> ordersMap = new HashMap<>();
    ordersMap.put("totalAmount", totalAmount);
    ordersMap.put("name", nameEditText.getText().toString());
    ordersMap.put("phone", phoneEditText.getText().toString());
    ordersMap.put("email", emailEditText.getText().toString());
    ordersMap.put("address", addressEditText.getText().toString());
    ordersMap.put("city", cityEditText.getText().toString());
    ordersMap.put("date", saveCurrentDate);
    ordersMap.put("time", saveCurrentTime);
    ordersMap.put("state", "not shipped");
    ordersRef.updateChildren(ordersMap).addOnCompleteListener(new OnCompleteListener<Void>() {
        @Override
        public void onComplete(@NonNull Task<Void> task) {
            if (task.isSuccessful()) {
                FirebaseDatabase.getInstance().getReference().
                        child("Cart List")
                        .child("User View")
                        .child(Prevalent.currentOnlineUser.getPhone())
                        .removeValue()
                        .addOnCompleteListener(new OnCompleteListener<Void>() {
                            @Override
                            public void onComplete(@NonNull Task<Void> task) {
                                if (task.isSuccessful()) {
                                    Toast.makeText(confirmActivity.this, "Your final order has been succesfully placed", Toast.LENGTH_LONG).show();
                                    Intent intent = new Intent(confirmActivity.this, HomeActivity2.class);
                                    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                                    startActivity(intent);
                                    finish();
                                }

                            }
                        });
            }
        }
    });
}

}

Answer 1

移动addNotification(); 在您的 firebase 的onComplete的if (task.isSuccessful()) {中，这样您只能确定订单确实已完成，否则它可能会卡在一些 firebase 错误中，客户将收到“已下订单”通知，该通知将是错误的。

Answer 2

最简单的方法是首先创建一个 boolean 全局变量来检查订单是否成功。

private boolean isOrderConfirmed = false; <-- This one.

@Override
protected void onCreate(Bundle savedInstanceState) {
...

并且，在onComplete()方法中设置该变量。

 @Override
public void onComplete(@NonNull Task<Void> task) {
    isOrderConfirmed = false; //Reset <-- This one
    if (task.isSuccessful()) {
    ...
        @Override
        public void onComplete(@NonNull Task<Void> task) {
            if (task.isSuccessful()) {
                isOrderConfirmed = true; //<-- And this one.
                Toast.makeText(confirmActivity.this, "Your final order has been succesfully placed", Toast.LENGTH_LONG).show();
...  

然后，您可以使用该变量来做某事。

private void check() {
...
} else {
    ConfirmOrder();
    if(isOrderConfirmed) {
        addNotification(); <-- This one.
        // doSomething();
   }
}