How to add a view dynamically to android as registered in mysql

Question

I would like to know how to add a view (Relativelayout) dynamically in my xml, as records are found in my Mysql BD... (My connection is made through Volley lib)

Answer 1

To implement the list you will need basically 4 parts:

1. The layout that will have the list
2. The layout of each item in the list
3. A custom adapter
4. Assign this adapter to your list by passing a list of the data you brought from Volley

1-) Layout that will have the list: main_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/bg_verde">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/minha_lista">
    </ListView>

</FrameLayout>

No secret here, only a Frame with a Listview inside, it is important to assign an ID to it

2-)Layout of each Item: list_item.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView
android:layout_width="match_parent"
android:layout_height="150dp"
android:id="@+id/minhaImagem"
/>

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/minhaLegenda"
android:layout_below="@id/minhaImagem"
/>
</RelativeLayout>

Here I did not worry about aesthetics, then you should format it the way you want. This layout will be repeated for each item.

3-) Custom Adaptor: myAdapter.java

public class myAdapter extends ArrayAdapter<SeuObjeto> {

    public Context context;
    public List<SeuObjeto> lista;

    public myAdapter(Context context, int resource, List<SeuObjeto> objects) {
        super(context, resource, objects);

        this.context = context;
        this.lista= objects;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
// Primeiro checa se a view ainda não foi inflada, se não infla
        if (convertView == null) {
// Inflando a nova View
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.list_item, parent, false);
        }
// Now we can fill the layout with the right values
        TextView txtLegenda= (TextView) convertView.findViewById(R.id.minhaLegenda);

       ImageView img = (ImageView) convertView.findViewById(R.id.minhaImagem);

        SeuObjeto seuObjeto = lista.get(position);

        txtLegenda.setText(seuObjeto.getLegenda());

        img.setImageBitmap(seuObjeto.getImagem()); // <------- Aqui você deve verificar como você está recebendo a imagem, e como vai atribuí-la à ImageView



        return convertView;
    }



}

Here we extend an Arrayadapter, it receives an object, if its data is not built on an object, I recommend, it is more quiet to treat.

4-) Listview Adapter Assignment: Minhaactivity.java

Inside of your onCreate

        ListView listView = (ListView) findViewById(R.id.minha_lista);
        List<SeuObjeto> minhaLista = meusDados; // <---------- Aqui não sei como você recebe os dados, se usa o Volley com Gson, provavelmente você facilmente terá essa lista com os objetos.
        myAdapter adapter = new myAdapter (this,R.layout.list_item,minhaLista);
        listView.setAdapter(adapter);

Here there is not much secret also, after receiving the data through Volley, organize them in a list of objects, an object with the image and the caption, then build your adapter passing (Context, layout of the items, Data), assign this Adapter to the list and everything ready