java - 如何在 android 中使用 Log.d 设置断点

Question

MessageSenderId = mAuth.getCurrentUser().getUid();
MessageRecieverId = getIntent().getStringExtra("visit_user_id");





private void sendMessage() {


    String messageText = messageArea.getText().toString();
    if (TextUtils.isEmpty(messageText)) {
        Toast.makeText(getApplicationContext(), "Can't Send Blank Message", Toast.LENGTH_SHORT).show();
    } else {

        String message_sender_ref = "Messages/" + MessageSenderId + "/" + MessageRecieverId;
        String message_reciver_ref = "Messages/" + MessageRecieverId + "/" + MessageSenderId;

        Map messageTextBody = new HashMap<>();
        messageTextBody.put("message", messageText);
        messageTextBody.put("seen", false);
        messageTextBody.put("type", "text");
        messageTextBody.put("time", ServerValue.TIMESTAMP);
        messageTextBody.put("from", MessageSenderId);

        DatabaseReference user_message_key = rootRef.child("Messages").child(MessageSenderId).child(MessageRecieverId).push();
        String message_push_id = user_message_key.getKey();


        Map messageBodyDetails = new HashMap();

        messageBodyDetails.put(message_sender_ref + "/" + message_push_id, messageTextBody);
        messageBodyDetails.put(message_reciver_ref + "/" + message_push_id, messageTextBody);

        rootRef.updateChildren(messageBodyDetails, new DatabaseReference.CompletionListener() {
            @Override
            public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
                if (databaseError != null) {
                    Log.d("Chat_Log", databaseError.getMessage().toString());
                }
                messageArea.setText("");
            }
        });

    }
}    





private void fetchMessages() {
    rootRef.child("Messages").child(MessageSenderId).child(MessageRecieverId).addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            ListView listView = (ListView) findViewById(R.id.messageList);
            ArrayAdapter<String> adapter;
            adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, android.R.id.text1, messagesList);
            String message = dataSnapshot.getValue().toString();
            message = dataSnapshot.child("message").getValue().toString();
            messagesList.add(message);
            adapter.notifyDataSetChanged();
            listView.setAdapter(adapter);
        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

}

几个月以来我一直在尝试制作一个聊天应用程序，但几周以来我一直停留在某个时间点...问题是我能够获取我发送的消息并显示在我的 ListView 中。但是我无法获取其他用户发送的消息...所有内容都存储在数据库中但我无法获取它...许多人建议我添加断点并检查。我不知道那是什么意思...任何人都可以帮我检查一下。比如我在哪里放置什么代码来检查 logcat 中的确切问题

请帮帮我

Answer 1

您应该点击鼠标左键，如下所示:

然后单击调试按钮以 Debug模式运行应用程序

Here您可以找到有关如何操作的视频。