Dynamically create buttons

Question

I’m making a screen where register some users. On this screen, I have a ScrollView with a Gridlayout inside, with 2 columns. Each column has 1 button, which when clicking, opens a link, in this case, Youtube.

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true">

    <GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:columnCount="2"
        android:paddingLeft="10dp"
        android:paddingRight="10dp">

        <Button
            android:layout_width="0dp"
            android:layout_height="90dp"
            android:layout_columnWeight="1"
            android:gravity="center"
            android:layout_gravity="fill_horizontal"
            android:background="@drawable/bg_button"
            android:text="DemonDies"
            android:onClick="demondies"
            android:textColor="@color/textColorPrimary"
            android:id="@+id/demondies" />...

In JAVA I do the rest:

 Button demondies,...
 demondies = (Button) view.findViewById(R.id.demondies);

demondies.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            Uri uri = Uri.parse("https://www.youtube.com/channel/UCEWQoXe934RcJr04efPm9OQ");
            Intent intent = new Intent(Intent.ACTION_VIEW, uri);
            startActivity(intent);
        }
    });...

So far blz, only now it’s starting to have a lot of buttons, and it’s getting kind of hard to keep creating button like this. Would there be a way to create buttons dynamically, retrieving the name and url of the database link or something? I was going to add the image here to see what the layout looks like, but it’s too big.

Edit The layout looks like this: http://imgur.com/uzEoq5l

Answer 1

Voce can create a layout for the buttons:
Filing cabinet btn_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<Button
   android:layout_width="0dp"
   android:layout_height="90dp"
   android:layout_columnWeight="1"
   android:gravity="center"
   android:layout_gravity="fill_horizontal"
   android:background="@drawable/bg_button"
   android:text="DemonDies"
   android:onClick="demondies"
   android:textColor="@color/textColorPrimary"
   android:id="@+id/demondies"
</Button>

Create an Adapter for that button.
Filing cabinet GridButtonsAdapter.java:

public class GridButtonsAdapter extends BaseAdapter {
    private ArrayList<String> list;

    @Override 
    publc int getCount() {
        return list.size;
    }

    @Override 
    public String getItem(position: int) {
        return list[position];
    }

    @Override
    public long getItemId(position: int) {
        return (long)position;
    }

    private Context mContext;
    GridButtonsAdapter(Context context, ArrayList<String> btnsNames) {
        this.mContext = context;
        this.list = btnsNames;
    }

    @SuppressLint("ViewHolder")
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // Inflate o view personalizado
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        Button itemLayout = (LinearLayout) inflater.inflate(R.layout.btn_layout, null);

        Button cellBtn = itemLayout.findViewById<View>(R.id.demondies);

        String name = list[position]

        cellBtn.setText(name)
        cellBtn.tag(name)
        return row
    }
}

then in its main Activity Voce mounts the Adapter

//...
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);
    // criar o metodo para preencher a sua lista de urls para o itemclick
    ArrayList<String> urlList = pegaSuaListaDeUrlsDoSeuDatabase();
    // criar o metodo para preencher a sua lista de nomes do seu database
    // voce pode criar um metodo void e criar esses dois campos no escopo
    // da classe e preencher os dois campos num unico metodo void onde
    // voce pega os valores para os nomes e para as urls, assim, simplifica
    // e diminui o codigo
    ArrayList<String> btnsNamesList = pegaSuaListaDeNomesDoSeuDatabase();
    // monta o adapter para a sua GridView
    GridLayout gridbtns = findViewById(R.id.suagrid);
    GridButtonsAdapter mAdapter = new GridButtonsAdapter(this, btnsNamesList);
    // cria um listener para o onItemClick de cada button dentro do adapter
    AdapterView.OnItemClickListener listener = (arg0, arg1, position, id) -> {
        // aqui voce pega um determinado item da lista de urls
        Uri uri = Uri.parse(urlList.get(position));
        // e passa ela para o intent
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(intent);
    };
    // passa o listener paa o click do adapter
    gridbtns.setOnItemClickListener(listener);
    // passa o adapter para a grid
    gridbtns.setAdapter(mAdapter);
}

so Voce will be able to create your buttons dynamically.
Logically, this is just an example.
I hope it helps you