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Android Build a Simple Android App Basic Android Programming Making a Button Do Something

Leonel Saldivar
Leonel Saldivar
459 Points

Cannot resolve symbol 'showFactButton'

Hi, I have the error "Cannot resolve symbol 'showFactButton'. I've tried with the answers here at the community but couldn't fix it.

This is the java code:

package com.example.usuario.funfacts;

import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

// Declarar variables

private TextView mFactTextView;

private Button mShowFactButton;



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

    // Asignar las vistas del layout file al corresponding variables
    mFactTextView = (TextView) findViewById(R.id.factortextView);
    mShowFactButton = (Button) findViewById(R.id.showFactButton);

    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //the button was clicked so update with a new fact
            String fact = "los perros son bien rapidos";
            mFactTextView.setText(fact);

        }
    };
    mShowFactButton.setOnClickListener(listener);
}

}

And this is the xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.usuario.funfacts.MainActivity" android:background="#39add1">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Che, sabías que...?"
    android:id="@+id/textView2"
    android:textSize="24dp"
    android:textColor="#80ffffff" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="es un mundo muy extraño?"
    android:id="@+id/factortextView"
    android:layout_centerVertical="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:textSize="24sp"
    android:textColor="#ffffff" />

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="¡Contame más guachín!"
    android:id="@+id/factorbutton"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:background="@android:color/white" />

</RelativeLayout>

I hope someone can help me out. Best regards,

1 Answer

Seth Kroger
Seth Kroger
56,412 Points

The id of your button in the XML is "factorbutton" but in the Java code you're using "showFactButton". You should only use one or the other, and make both of them the same name.

Leonel Saldivar
Leonel Saldivar
459 Points

Thank you!! It worked perfectly. Best