Placing click event on the button that is in a Fragment, in an Activity?

Question

Placing click event on the button that is in a Fragment, in an Activity?

Navigation

#1 by (3 votes)

3

I want to put a setOnClickListener on the button that is in a fragment, through my activity.

Here are the codes:

Activity:

private Button mButtonCriarConta;

//
onCreate da Activity...

mButtonCriarConta = (Button) findViewById(R.id.email_criar_button);
    Log.v("OnClick", "Nao Entrou no onClick");
    mButtonCriarConta.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Log.v("OnClick", "Entrou no onClick");
            Intent intent = new Intent(LoginActivity.this, DonoDoProntuarioActivity.class);

            Bundle parametros = new Bundle();
            String email = mEmailCriarNovo.getText().toString();
            String senhaCriar = mSenhaCriarNovo.getText().toString();
            parametros.putString("email", email);
            parametros.putString("senha", senhaCriar);

            intent.putExtras(parametros);
            startActivity(intent);
        }
    });

Fragment where the

button is located

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    view = inflater.inflate(R.layout.fragment_criar_novo, container, false);

//resto do método
return view;}

Fragment XML

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

<ScrollView
    android:id="@+id/login_form"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/email_novo_form"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/campoEmailNovoUsuario"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/prompt_email"
                android:inputType="textEmailAddress"
                android:maxLines="1"
                android:singleLine="true" />

        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/campoSenhaNovo"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/prompt_password"
                android:imeActionId="@+id/login"
                android:imeActionLabel="@string/action_sign_in_short"
                android:imeOptions="actionUnspecified"
                android:inputType="textPassword"
                android:maxLines="1"
                android:singleLine="true" />

        </android.support.design.widget.TextInputLayout>

        <CheckBox
            android:id="@+id/chk_mostrar_senha"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="@string/chk_mostrar_senha" />

        <!-- <FrameLayout
            android:id="@+id/fragment_placeholder"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"></FrameLayout>  -->
        <TextView
            android:id="@+id/texto_termos_criar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:textAlignment="center" />

        <Button
            android:id="@+id/email_criar_button"
            style="?android:textAppearanceSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="5dp"
            android:background="@drawable/botao_arredondado"
            android:gravity="center_horizontal|center_vertical"
            android:text="@string/acao_nova_conta"
            android:textColor="@color/branco"
            android:textStyle="bold" />

    </LinearLayout>
</ScrollView>

When I run the program on the phone that the app stopped working and only the log appears before entering the setOnClickListener, what might be happening and how to fix it?

java android android-fragment android-activity

asked by anonymous 10.11.2015 / 16:07

1 answer

What is the gain of "unifying" the .css and .js resources of a site? Can not evaluate expression because the current thread is in stack overflow state

score 3 · Accepted Answer

You can not / should do it like this. It is the fragment that should receive events from your views .

The findViewById() method can only find the views that are part of the layout passed to the setContentView() method. Because the button is not in the layout of Activity, findViewById(R.id.email_criar_button); returns null .

The usual thing in these cases is to have fragment inform Activity that the button was clicked.

To do this, in the fragment class, define an interface that Actvity should implement so that it can be notified:

public interface CreateEmailListener {
      public void onCreateEmail();
}

Declare a private variable in Fragment to save the Activity reference that implements the interface.

private CreateEmailListener mListener;

On the onAttach event of the Fragment get and save the reference to Activity .

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

You should now create the OnClickListener for the button inside the onCreateView method :

private Button mButtonCriarConta;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    view = inflater.inflate(R.layout.fragment_criar_novo, container, false);

    mButtonCriarConta = (Button) view.findViewById(R.id.email_criar_button);

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

            //Chame aqui o método da Activity
            mListener.onCreateEmail();
        }
    });

    //resto do método
    return view;
}

Now you just have to Activity implement the CreateEmailListener interface and implement the onCreateEmail()

10.11.2015 / 16:45