String phoneNumber = number.getText().toString();         String smsmessage = message.getText().toString();         if(phoneNumber == null || phoneNumber.length() == 0 || smsmessage == null || smsmessage.length() == 0){             return;         }         if(checkPermission(Manifest.permission.SEND_SMS)){             SmsManager smsManager = SmsManager.getDefault();             smsManager.sendTextMessage(phoneNumber, null, smsmessage, null, null);             Toast.makeText(this, "Message sent", Toast.LENGTH_SHORT).show();         }       Question 2: Explain the following code: button.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 FragmentManager fm = getSupportFragmentManager();                 FragmentTransaction ft = fm.beginTransaction();                 XFragment xfragment = new XFragment();                 ft.add(R.id.Main_fragment, xfragment);                 ft.commit();             }         });     Question 3: Explain the following code:    @NonNull     @Override     public houseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {         View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.custom_layout, null, false);         ViewHolder viewHolder = new ViewHolder(v);         return null;

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question

 

public void OnSend(View v){

        String phoneNumber = number.getText().toString();

        String smsmessage = message.getText().toString();

        if(phoneNumber == null || phoneNumber.length() == 0 || smsmessage == null || smsmessage.length() == 0){

            return;

        }

        if(checkPermission(Manifest.permission.SEND_SMS)){

            SmsManager smsManager = SmsManager.getDefault();

            smsManager.sendTextMessage(phoneNumber, null, smsmessage, null, null);

            Toast.makeText(this, "Message sent", Toast.LENGTH_SHORT).show();

        }

 

 

 

Question 2:

Explain the following code:

button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                FragmentManager fm = getSupportFragmentManager();

                FragmentTransaction ft = fm.beginTransaction();

                XFragment xfragment = new XFragment();

                ft.add(R.id.Main_fragment, xfragment);

                ft.commit();

            }

        });

 

 

Question 3:

Explain the following code: 

  @NonNull

    @Override

    public houseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.custom_layout, null, false);

        ViewHolder viewHolder = new ViewHolder(v);

        return null;

    }

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