发送片段之间的数据在pagerAdapter [英] Send data between fragments in a pagerAdapter

问题描述

您好，我想两个片段之间发送数据（armarFragment到cocinaFragment），但我不知道该怎么做，因为无论是它实现了一个pagerAdaptar显示diferents片段相同的活动（tabsActivity）。在这里，我把我的code。谢谢你。

Hello I am trying to send data between two fragments, (armarFragment to cocinaFragment) but I dont know how do it, because both are in the same Activity (tabsActivity) which implements a pagerAdaptar to show diferents fragments. Here I put my code. Thanks.

1. tabsActivity.java（在里面可以找到该类pagerAdapter）。

1. tabsActivity.java (inside you can found the class pagerAdapter).

public class tabsActivity extends AppCompatActivity {

public MyFragmentPagerAdapter myFragmentPagerAdapter;

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

    android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.appbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setTitle("Arma tu pizza");

    myFragmentPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());

    ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
    viewPager.setAdapter(myFragmentPagerAdapter);

    TabLayout tabLayout = (TabLayout) findViewById(R.id.appbartabs);
    tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
    tabLayout.setupWithViewPager(viewPager);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_login, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}/*__________________ NEW CLASS, PAGERADAPTAR ____________________*/


public class MyFragmentPagerAdapter extends FragmentPagerAdapter {
    final int PAGE_COUNT = 4;
    String tabTitles[] =
            new String[] { "Inicio","Armar pizza","Cocina","Chef"};

    public MyFragmentPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public int getCount() {
        return PAGE_COUNT;
    }

    @Override
    public Fragment getItem(int position) {

        Fragment f = null;

        switch(position) {
            case 0:
                f = inicioFragment.newInstance();
                break;
            case 1:
                f = armarFragment.newInstance();
                break;
            case 2:
                f = cocinaFragment.newInstance();
                break;
            case 3:
                f = chefFragment.newInstance();
                break;
        }
        return f;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        // Generate title based on item position
        return tabTitles[position];
    }
}}

armarFregment.java（里面你可以找到一个viewHolder但忽略）。

armarFregment.java (inside you can found a viewHolder but ignore that).

public class armarFragment extends Fragment implements View.OnClickListener{

View rootView;

private RecyclerView recycler;
private productoAdapter adapter;
private RecyclerView.LayoutManager lManager;
private EditText txtNombrePizza;

private ArrayList<producto> productosSeleccionados;

Button btnEnviarALaCocina;
RadioButton pequeña;
RadioButton mediana;
RadioButton grande;


public static armarFragment newInstance() {
    armarFragment fragment = new armarFragment();
    return fragment;
}

public armarFragment() {
    productosSeleccionados = new ArrayList<producto>();
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.fragment_armar, container, false);

    ArrayList<producto> items = new ArrayList<producto>();

    items.add(new producto(R.drawable.jamon, "Jamón", "¡Pssst!, sabe muy bien en pizzas dulces.", 2000));
    items.add(new producto(R.drawable.pollo, "Pollo","¡Pssst!, combina con TODO.",1500));
    items.add(new producto(R.drawable.queso, "Queso","Delicioso queso mozzarela, ¡Yummy Yummy!",2000));
    items.add(new producto(R.drawable.champinones, "Champiñones","Suculentos champiñones equixitos y suaves.",1500));
    items.add(new producto(R.drawable.peperoni, "Pepperoni","Fresco pepperoni con un toque de picante.",3000));
    items.add(new producto(R.drawable.pina, "Piña","¡Fresca y jugosa piña Colombiana papá!",1500));
    items.add(new producto(R.drawable.pasas, "Ciruelas pasas","Las más negritas y a la vez las más dulces.",1500));
    items.add(new producto(R.drawable.salami, "Salami","Delicioso salami en rodajitas así como el salchichon cervecero.",3000));
    items.add(new producto(R.drawable.chorizo, "Chorizo","¡Choricito santarrosano ome!",3000));
    items.add(new producto(R.drawable.cebolla, "Cebolla","La que ha hecho llorar a mas de uno, fresca y suave al paladar",1000));
    items.add(new producto(R.drawable.carnemolida, "Carne molida","Ideal para los arriesgados; fresca y deliciosa.",2500));
    items.add(new producto(R.drawable.pimenton, "Pimentón","Uno de los más enojados; crujiente y exquisito.",1000));
    items.add(new producto(R.drawable.tomate, "Tomate", "Otro rojo más; cosechados en nuestra tierrita.", 1000));
    items.add(new producto(R.drawable.maiz, "Maíz tierno","Se dice por ahi que el maíz es el más tierno",1000));
    items.add(new producto(R.drawable.jalapeno, "Jalapeño", "Si la cebolla te hace lorar imaginate este.", 2000));
    items.add(new producto(R.drawable.tocineta, "Tocineta","Deiciosa tocineta; ideal en pizzas de sal.",500));
    items.add(new producto(R.drawable.aceituna, "Aceituna", "Suaves y jugosas aceitunas, ideales para pizzas con proteinas.", 1000));
    items.add(new producto(R.drawable.oregano, "Orégano","El toque de sabor que nunca ha de faltar.",300));
    items.add(new producto(R.drawable.salsabbq, "Salsa BBQ", "La salsa ideal para pizzas de sal.", 500));

    recycler = (RecyclerView) rootView.findViewById(R.id.reciclador);
    recycler.setHasFixedSize(true);

    btnEnviarALaCocina = (Button) rootView.findViewById(R.id.btnEnviarALaCocina);
    btnEnviarALaCocina.setOnClickListener(this);

    txtNombrePizza = (EditText) rootView.findViewById(R.id.setNombrePizza);

    pequeña = (RadioButton) rootView.findViewById(R.id.radioPersonal);
    pequeña.setOnClickListener(this);
    mediana = (RadioButton) rootView.findViewById(R.id.radioMediana);
    mediana.setOnClickListener(this);
    grande = (RadioButton) rootView.findViewById(R.id.radioGrande);
    grande.setOnClickListener(this);

    // Usar un administrador para LinearLayout
    lManager = new LinearLayoutManager(getContext());
    recycler.setLayoutManager(lManager);

    // Crear un nuevo adaptador
    adapter = new productoAdapter(items);

    recycler.setAdapter(adapter);

    recycler.setItemAnimator(new DefaultItemAnimator());

    return rootView;
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btnEnviarALaCocina:

            String nombrePizza = txtNombrePizza.getText().toString();

            productosSeleccionados = adapter.getProductosSeleccionados();

            Log.i("prueba 1", "size: " + productosSeleccionados.size());

            ArrayList<String> nombreProductos = new ArrayList<String>();
            ArrayList<Integer> precioProductos = new ArrayList<Integer>();

            for(producto p: productosSeleccionados){
                nombreProductos.add(p.getNombre());
                precioProductos.add(p.getPrecio());
            }

            if(productosSeleccionados.size() == 0){

                Toast.makeText(getContext(), "Debes seleccionar ingredientes.",
                        Toast.LENGTH_LONG).show();

            }else if(nombrePizza.matches("")) {

                Toast.makeText(getContext(), "Debes ponerle un nombre a la pizza.",
                        Toast.LENGTH_LONG).show();
            }else if(pequeña.isChecked() == false && mediana.isChecked() == false && grande.isChecked() == false){

                Toast.makeText(getContext(), "Debes selecionar un tamaño.",
                        Toast.LENGTH_LONG).show();
            }

            break;
    }
}

/*______________________________________________________________________________________________
NEW CLASS, PRODUCTOVIEWHOLDER
 _______________________________________________________________________________________________*/

public class productoAdapter extends RecyclerView.Adapter<productoAdapter.productoViewHolder> {

    private ArrayList<producto> productosSeleccionados;
    private ArrayList<producto> productos;

    public class productoViewHolder extends RecyclerView.ViewHolder {

        // Campos respectivos de un item
        public ImageView imgProducto;
        public TextView txtNombre, txtDescripcion, txtPrecio;
        public Button btnAgregar;

        public productoViewHolder(View v) {
            super(v);
            imgProducto = (ImageView) v.findViewById(R.id.imgProducto);
            txtNombre = (TextView) v.findViewById(R.id.txtNombre);
            txtDescripcion = (TextView) v.findViewById(R.id.txtDescripcion);
            txtPrecio = (TextView) v.findViewById(R.id.txtPrecio);
            btnAgregar = (Button) v.findViewById(R.id.btnAgregar);
        }
    }

    public productoAdapter(ArrayList<producto> items) {
        productosSeleccionados = new ArrayList<producto>();
        this.productos = items;
    }


    public ArrayList<producto> getProductosSeleccionados(){
        return productosSeleccionados;
    }

    public int getItemCount() {
        return productos.size();
    }

    public productoViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.card_productos, viewGroup, false);

        return new productoViewHolder(v);
    }

    public void onBindViewHolder(productoViewHolder viewHolder, final int i) {
        viewHolder.imgProducto.setImageResource(productos.get(i).getImagen());
        viewHolder.txtNombre.setText(productos.get(i).getNombre());
        viewHolder.txtDescripcion.setText(productos.get(i).getDescripion());
        viewHolder.txtPrecio.setText("$ " + String.valueOf(productos.get(i).getPrecio()));
        viewHolder.btnAgregar.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {
                productosSeleccionados.add(productos.get(i));

            }
        });
    }
}}

cocinaFrgment.java（里面你可以找到一个viewHolder但忽略）。

cocinaFrgment.java (inside you can found a viewHolder but ignore that).

公共类cocinaFragment扩展片段{

public class cocinaFragment extends Fragment {

View rootView;

private RecyclerView recycler;
private RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager lManager;

ArrayList<pizza> items;

public static cocinaFragment newInstance() {
    cocinaFragment fragment = new cocinaFragment();
    return fragment;
}

public cocinaFragment() {
    items = new ArrayList<pizza>();
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.fragment_cocina, container, false);


    recycler = (RecyclerView) rootView.findViewById(R.id.reciclador);
    recycler.setHasFixedSize(true);

    // Usar un administrador para LinearLayout
    lManager = new LinearLayoutManager(getContext());
    recycler.setLayoutManager(lManager);

    // Crear un nuevo adaptador
    adapter = new pizzaAdapter(items);
    recycler.setAdapter(adapter);

    return rootView;
}


/*______________________________________________________________________________________________
NEW CLASS, PIZZAVIEWHOLDER
 _______________________________________________________________________________________________*/

public class pizzaAdapter extends RecyclerView.Adapter<pizzaAdapter.pizzaViewHolder> implements View
.OnClickListener{
    private ArrayList<pizza> pizzas;

    private View.OnClickListener listener;

    public class pizzaViewHolder extends RecyclerView.ViewHolder {
        // Campos respectivos de un item
        public TextView txtNombrePizza, txtTamaño, txtIngredientes, txtPrecio;

        public pizzaViewHolder(View v) {
            super(v);
            txtNombrePizza = (TextView) v.findViewById(R.id.txtNombrePizza);
            txtTamaño = (TextView) v.findViewById(R.id.txtTamaño);
            txtIngredientes = (TextView) v.findViewById(R.id.txtIngredientes);
            txtPrecio = (TextView) v.findViewById(R.id.txtPrecio);
        }
    }

    public pizzaAdapter(ArrayList<pizza> items) {
        this.pizzas = items;
    }


    public int getItemCount() {
        return pizzas.size();
    }


    public pizzaViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.card_pizzas, viewGroup, false);

        v.setOnClickListener(this);

        return new pizzaViewHolder(v);
    }

    public void setOnClickListener(View.OnClickListener listener) {
        this.listener = listener;
    }

    @Override
    public void onClick(View view) {
        if(listener != null)
            listener.onClick(view);
    }



    public void onBindViewHolder(pizzaViewHolder viewHolder, int i) {
        viewHolder.txtNombrePizza.setText(pizzas.get(i).getNombre());
        viewHolder.txtTamaño.setText(pizzas.get(i).getTamaño());
        viewHolder.txtIngredientes.setText(pizzas.get(i).getIngredientes());
        viewHolder.txtPrecio.setText("$ " + String.valueOf(pizzas.get(i).getPrecio()));
    }
}

}

推荐答案

好吧，由于Android指导说，你必须创建在片段的接口。例如：

Ok, as android guidelines says, you must create an interface in your fragment. For example:

public class armarFragment extends Fragment implements View.OnClickListener{
    ...
    private armarFragmentListener mListener;

    public interface armarFragmentListener {
        void onEnviar ();
    }

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mListener = (armarFragmentListener) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString()
                + " must implement armarFragmentListener ");
    }
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btnEnviarALaCocina:
            //Do what you want.
            mListener.onEnviar(/*Change interface to pass arguments if you want*/);
        break;
    }
}

您活动必须实现该接口，做对应，比如调用片段的方法来获取数据。当你拥有了数据，您可以将它传递给新的片断作为参数或其他。

Your activity must implements that interface and do what corresponds, for example call the methods of the fragment to get the data. When you have the data you can pass it to the new fragment as arguments or otherwise.

当您创建在Android Studio中的空白片段，它把那个结构的类在默认情况下。创建一个新的空白片段看一看吧。

When you create a blank fragment in android studio it put that structure on the class by default. Create a new blank fragment and take a look at it.

这篇关于发送片段之间的数据在pagerAdapter的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！