android – How can a fragment call another fragment?

Question:

I have an app with a screen and on that screen there is a fragment. In this fragment there is a button that, when clicked, I want to call another fragment and that remains/replaces the button fragment. I've been trying something I've seen on the web and I'm not succeeding.

RechargeActivity Screen

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimary"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.gustavo.easypasse.RecargaActivity"
tools:showIn="@layout/activity_recarga">

<LinearLayout
    android:id="@+id/linearLayout11"
    android:layout_width="0dp"
    android:layout_height="25dp"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:background="@android:color/black"
    android:orientation="horizontal"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Valor da recarga"
        android:textColor="@android:color/background_light" />

    <EditText
        android:id="@+id/edtValorRecarga"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="@android:color/holo_blue_dark"
        android:ems="10"
        android:inputType="textPersonName" />
</LinearLayout>

<LinearLayout
    android:id="@+id/linearLayout12"
    android:layout_width="0dp"
    android:layout_height="25dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:background="@android:color/black"
    android:orientation="horizontal"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout11">

    <TextView
        android:id="@+id/textView8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="CPF"
        android:textColor="@android:color/background_light" />

    <EditText
        android:id="@+id/edtCPF"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="9dp"
        android:layout_weight="1"
        android:background="@android:color/holo_blue_dark"
        android:ems="10"
        android:inputType="textPersonName" />
</LinearLayout>

<LinearLayout
    android:id="@+id/llContainer"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@android:color/black"
    android:orientation="horizontal"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout12">

    <include
        android:id="@+id/includeCartaoCreditoDebito"
        layout="@layout/fragment_cartao_boleto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

<LinearLayout
    android:id="@+id/linearLayout8"
    android:layout_width="0dp"
    android:layout_height="25dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="168dp"
    android:orientation="horizontal"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/llContainer">

    <TextView
        android:id="@+id/textView10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Saldo disponível"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />

    <TextView
        android:id="@+id/textView11"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Saldo gasto"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />
</LinearLayout>

<LinearLayout
    android:layout_width="0dp"
    android:layout_height="35dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:orientation="horizontal"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout8"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp"
    android:id="@+id/linearLayout9">

    <TextView
        android:id="@+id/tvValorSaldoDisponivel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="R$ 850,00"
        android:textAlignment="center"
        android:textColor="@android:color/background_light"
        android:textSize="24sp" />

    <TextView
        android:id="@+id/tvValorSaldoGasto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="R$ 125,00"
        android:textAlignment="center"
        android:textColor="@android:color/background_light"
        android:textSize="24sp" />
</LinearLayout>

<LinearLayout
    android:id="@+id/linearLayout10"
    android:layout_width="0dp"
    android:layout_height="25dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="12dp"
    android:orientation="horizontal"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout9">

    <TextView
        android:id="@+id/textView14"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Data renovar recarga"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />

    <TextView
        android:id="@+id/textView15"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Transferência de saldo"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />
</LinearLayout>

<LinearLayout
    android:id="@+id/linearLayout15"
    android:layout_width="0dp"
    android:layout_height="40dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:orientation="horizontal"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout10"
    app:layout_constraintVertical_bias="0.0">

    <TextView
        android:id="@+id/tvDataRenovarRecarga"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="18/10/2017"
        android:textAlignment="center"
        android:textColor="@android:color/background_light"
        android:textSize="24sp" />

    <TextView
        android:id="@+id/tvValorTransSaldo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="-R$ 25,00"
        android:textAlignment="center"
        android:textColor="@android:color/background_light"
        android:textSize="24sp" />
</LinearLayout>

1º fragment

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.gustavo.easypasse.CartaoBoletoFragment">

<!-- TODO: Update blank fragment layout -->
<LinearLayout
    android:id="@+id/linearLayout13"
    android:layout_width="match_parent"
    android:layout_height="25dp"
    android:layout_marginEnd="0dp"
    android:layout_marginLeft="0dp"
    android:layout_marginRight="0dp"
    android:layout_marginStart="0dp"
    android:layout_marginTop="0dp"
    android:background="@android:color/black"
    android:orientation="horizontal"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout12">

    <TextView
        android:id="@+id/textView9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="FORMA DE PAGAMENTO"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />
</LinearLayout>

<LinearLayout
    android:id="@+id/linearLayout14"
    android:layout_width="wrap_content"
    android:layout_height="25dp"
    android:layout_marginTop="25dp"
    android:background="@android:color/black"
    android:orientation="horizontal"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout13">

    <TextView
        android:id="@+id/textView13"
        android:layout_width="225dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.98"
        android:text="Cartão de crédito/débito"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />

    <TextView
        android:id="@+id/textView16"
        android:layout_width="230dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Boleto bancário"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />

</LinearLayout>

<LinearLayout
    android:id="@+id/LinearLayoutCartaoBoleto"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_marginTop="50dp"
    android:background="@android:color/black"
    android:orientation="horizontal">

    <ImageButton
        android:id="@+id/ibCartaoCredito"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="@android:color/black"
        android:onClick="cartaoCreditoDebito"
        android:src="@drawable/cartao_de_credito_01" />

    <ImageButton
        android:id="@+id/ibBoleto"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="@android:color/black"
        android:src="@drawable/boleto_bancario_01" />
</LinearLayout>

2º fragment 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment_cartao"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.gustavo.easypasse.CartaoCreditoFragment">

<!-- TODO: Update blank fragment layout -->

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView12"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="10dp"
        android:background="@android:color/black"
        android:text="FORMA DE PAGAMENTO"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />

    <TextView
        android:id="@+id/textView18"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:background="@android:color/black"
        android:text="Cartão de Crédito/Débito"
        android:textAlignment="center"
        android:textColor="@android:color/background_light" />

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/black"
        android:src="@drawable/cartao_de_credito_01" />

</LinearLayout>

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="140dp"
    android:orientation="vertical">

</LinearLayout>

Activity from the Recharge web

public class RecargaActivity extends AppCompatActivity {

private EditText valorRecarga;
private EditText cpf;
private ImageButton boleto;
private TextView saldoDisponivel;
private TextView saldoGasto;
private TextView renovarRecarga;
private TextView transSaldo;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_recarga);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    valorRecarga = (EditText) findViewById(R.id.edtValorRecarga);
    cpf = (EditText) findViewById(R.id.edtCpf);

    saldoDisponivel = (TextView) findViewById(R.id.tvValorSaldoDisponivel);
    saldoGasto = (TextView) findViewById(R.id.tvValorSaldoGasto);
    renovarRecarga = (TextView) findViewById(R.id.tvDataRenovarRecarga);
    transSaldo = (TextView) findViewById(R.id.tvValorTransSaldo);

}

}

Activity do fragment chamado

public class CartaoCreditoFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";

// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;

private OnFragmentInteractionListener mListener;

public CartaoCreditoFragment() {
    // Required empty public constructor
}

// TODO: Rename and change types and number of parameters
public static CartaoCreditoFragment newInstance(String param1, String param2) {
    CartaoCreditoFragment fragment = new CartaoCreditoFragment();
    Bundle args = new Bundle();
    args.putString(ARG_PARAM1, param1);
    args.putString(ARG_PARAM2, param2);
    fragment.setArguments(args);
    return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {
        mParam1 = getArguments().getString(ARG_PARAM1);
        mParam2 = getArguments().getString(ARG_PARAM2);
    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_cartao_credito, container, false);

    final ImageButton cartaoCreditoDebito = (ImageButton) v.findViewById(R.id.ibCartaoCredito);

    cartaoCreditoDebito.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            CartaoCreditoFragment cartaoCreditoFragment =  new CartaoCreditoFragment();
            FragmentManager manager = getFragmentManager();
            manager.beginTransaction()
                    //.replace(R.id.llContainer, new CartaoCreditoFragment()).commit();
                    .replace(R.id.includeCartaoCreditoDebito, new CartaoCreditoFragment()).commit();
        }
    });

    return v;

}

// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
    if (mListener != null) {
        mListener.onFragmentInteraction(uri);
    }
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);

}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

}

}

Answer:

It's very simple!

Inside the "onClick" method of the button that serves to call another fragment, do the following:

FragmentManager fragmentManager = getActivity().getSupportFragmentManager();

FrgmentTransaction fragmentTransaction = fragmentManager.beginTransacition();

fragmentTransaction.replace(R.id.fragmentContainer, new Fragment2()).commit();

Note that "R.id.fragmentContainer" is the name of the frameLayout that is contained in your xlm file and that contains your fragments and "Fragment2()" is the class of the new fragment you want to start.

Hope this helps you. Good luck!

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