Question

我想在字符串fakeMessage中阻止此消息，但它不起作用，我不知道为什么..............任何人都有任何想法这样做

  sendButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String messageText = messageArea.getText().toString();
            String fakeMessage = "hello you win 1000$ with us send your Email pls";

            if(!messageText.equals("")){
                Map<String, String> map = new HashMap<String, String>();
                map.put("message", messageText);
                map.put("user", UserDetails.username);

                    for (String key : map.keySet()) {
                        if (map.get(key) == fakeMessage) {

                            Toast.makeText(Chat.this, "This Is A Fake Message and We Can't Send It", Toast.LENGTH_SHORT).show();
                            Toast.makeText(Chat.this, "Please Don't Try To Send It Again ", Toast.LENGTH_SHORT).show();

                        } else {
                            reference1.push().setValue(map);
                            reference2.push().setValue(map);
                            messageArea.setText("");

                        }
                    }
            }
        }
    });

Answer 1

请更改

if (map.get(key) == fakeMessage)

为：

if (map.get(key).equals(fakeMessage))

==比较对象引用，其中equals比较String对象的内容。它的男生概念。

Answer 2

如果在大写或小写的情况下消息不匹配，则使用equals ignore case进行比较第二，你正在推动和设置文本两次在for循环你应该只有一次，如果有错误你可以返回

 sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String messageText = messageArea.getText().toString();
                String fakeMessage = "hello you win 1000$ with us send your Email pls";

                if(!messageText.equals("")){
                    Map<String, String> map = new HashMap<String, String>();
                    map.put("message", messageText);
                    map.put("user", UserDetails.username);

                        for (String key : map.keySet()) {
                            if (map.get(key).equalsIgnoreCase(fakeMessage)) {

                                Toast.makeText(Chat.this, "This Is A Fake Message and We Can't Send It", Toast.LENGTH_SHORT).show();
                                Toast.makeText(Chat.this, "Please Don't Try To Send It Again ", Toast.LENGTH_SHORT).show();
                            return;
                            } 
                        }
                  reference1.push().setValue(map);
                  reference2.push().setValue(map);
                  messageArea.setText("");
                }
            }
        });

如何阻止短信

2 个答案: