Which custom adapter to use?

Question

I`m trying to build my own simple example of an app that has a ListView and parcelables interaction.

The app has a first Activity with 3 EditTexts where the user inputs his name, address and country. On the bottom there is a button.

The Button should send the data the user inputed through an extra to a new activity and call the new activity. This new activity should have a ListView with custom list items with the user`s name, address and country - the way he typed on the first Activity.

I would like to send this user data from one activity to the other using parcelables. (I know I dont need it in this case but Im doing this to practice for more complex examples).

Question; 1- in which format should I send this data to the 2nd activity? String, List, ArrayList, Array of Strings?

2- what type of custom adapter should I use and what kind of code should this adapter contain?

I tried to copy some code from the stormy example from the parcelables section but it did not work.

Thanks!!

Answer 1 · 2015-08-08T20:01:07Z

August 8, 2015 8:01pm

Hi Marcel,

It's good that you recognize that you do not need to use Parcelable for this type of problem. If you wanted to practice, I would recommend creating a new class. Maybe something called User

public class User implements Parcelable{
private String mName;
private String mAddress;
private String mCountry;

   public User(String name, String address, String country) {
      mName = name;
      mAddress = address;
      mCountry = country;
   }

   //practice adding your parcelable code here
}

Then in your first activity you can construct your new User when the user clicks the button and add that User object to your Intent.

I tend to use RecyclerView.Adapter. I'm not sure if you've gotten that far however. A simple array adapter would work well, and you can just make a new array of Strings that contain each of the above properties in whatever order you want.

Answer 2 · 2015-08-11T00:33:23Z

August 11, 2015 12:33am

Thanks Jon but I still can`t seem to make it on my own. There is the code. I would really appreciate if you could help me!

*** MAIN ACTIVITY ***

        package com.example.marcelshimabukuro.treino_lista_inflater_adapter_bean;

import android.content.Context; import android.content.Intent; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText;

import java.util.ArrayList;

public class MainActivity extends ActionBarActivity {

public Context mContext;

public EditText etNome, etEndereco, etPais;
public Button mButton;

public ArrayList<Usuarios> mUsuariosArrayList;

public String mNome, mEndereco, mPais;
public String[] mDadosUsuario;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mContext = this;

    loadComponents();

    loadDadosDeUsuario();

    loadButtonActions();

}


private void loadComponents() {

    mButton = (Button) findViewById(R.id.btActivity2);

    etNome = (EditText) findViewById(R.id.etNome1);
    etEndereco = (EditText) findViewById(R.id.etEndereco1);
    etPais = (EditText) findViewById(R.id.etPais1);

}

public Usuarios[] loadDadosDeUsuario() {


    Usuarios[] usuariosArray = new Usuarios[3];

    for (int i = 0; i < 3; i++) {

        Usuarios usuarios = new Usuarios();

        usuarios.setNome(etNome.getText().toString());
        usuarios.setEndereço(etEndereco.getText().toString());
        usuarios.setPais(etPais.getText().toString());

        usuariosArray[i] = usuarios;

    }

    return usuariosArray;


}


private void loadButtonActions() {

    mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            Intent intent = new Intent(mContext, ListaActivity.class);

            intent.putExtra("dadosdeusuario", loadDadosDeUsuario());

            startActivity(intent);

        }
    });



}

}

*** USER CLASS ***

package com.example.marcelshimabukuro.treino_lista_inflater_adapter_bean;

import android.os.Parcel; import android.os.Parcelable;

/**

Created by marcelshimabukuro on 7/25/15. */

public class Usuarios implements Parcelable {

public String mNome, mEndereço, mPais;

public Usuarios() {

}


public String getNome() {
    return mNome;
}

public void setNome(String nome) {
    mNome = nome;
}

public String getEndereço() {
    return mEndereço;
}

public void setEndereço(String endereço) {
    mEndereço = endereço;
}

public String getPais() {
    return mPais;
}

public void setPais(String pais) {
    mPais = pais;
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {

    dest.writeString(mNome);
    dest.writeString(mEndereço);
    dest.writeString(mPais);

}

private Usuarios (Parcel in) {

    mNome = in.readString();
    mEndereço = in.readString();
    mPais = in.readString();
}

//Creator

public static final Creator<Usuarios> CREATOR = new Creator<Usuarios>() {
    @Override
    public Usuarios createFromParcel(Parcel source) {
        return new Usuarios(source);
    }

    @Override
    public Usuarios[] newArray(int size) {
        return new Usuarios[size];
    }
};

}

*** LISTACTIVITY ***

package com.example.marcelshimabukuro.treino_lista_inflater_adapter_bean;

import android.app.ListActivity; import android.content.Context; import android.content.Intent; import android.os.Parcelable; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.Button; import android.widget.ListView; import android.widget.Toast;

import java.util.ArrayList; import java.util.Arrays;

public class ListaActivity extends ListActivity {

public Context mContext;
public ListView mListView;

public Usuarios[] mUsuariosArray;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_lista);

    mContext = this;

    loadComponents();

    loadList();

    loadAdapter();

}


private void loadComponents() {

    mListView = (ListView) findViewById(R.id.lvLista3);

}

private void loadList() {

    Intent intent = getIntent();

    Parcelable[] parcelables = intent.getParcelableArrayExtra("dadosdeusuario");

   mUsuariosArray = Arrays.copyOf(parcelables, parcelables.length, Usuarios[].class);


}

private void loadAdapter() {

    NewAdapter adapter = new NewAdapter(mUsuariosArray);

    mListView.setAdapter(adapter);



}

}

*** CUSTOM ADAPTER ***

package com.example.marcelshimabukuro.treino_lista_inflater_adapter_bean;

import android.content.Context; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.TextView;

/**

Created by marcelshimabukuro on 8/10/15. */ public class NewAdapter extends ArrayAdapter<Usuarios> {

public Usuarios[] mUsuariosArray;

public NewAdapter(Usuarios[] usuariosArray){

mUsuariosArray = usuariosArray;

}

@Override public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder viewHolder;

if (convertView == null) {

    convertView = View.inflate(getContext(), R.layout.itens_de_lista, null);

}

return convertView;

}

public class ViewHolder {

public TextView mNome, mEndereço, mPais;

public ViewHolder(View itemView) {

    mNome = (TextView) itemView.findViewById(R.id.tvNome);
    mEndereço = (TextView) itemView.findViewById(R.id.tvEndereço);
    mPais = (TextView) itemView.findViewById(R.id.tvPais);

}

public void bindUsuario(Usuarios usuarios){

    mNome.setText(usuarios.mNome);
    mEndereço.setText(usuarios.mEndereço);
    mPais.setText(usuarios.mPais);
}

}

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marcel shimabukuro

marcel shimabukuro

Which custom adapter to use?

2 Answers

Jon Kussmann

Jon Kussmann

marcel shimabukuro

marcel shimabukuro

marcel shimabukuro

marcel shimabukuro