Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial


'Cannot resolve symbol', 'cannot resolve method'

In the course "Build a simple Android App" - "Accessing Views in Code: Assigning Variables" I get stuck. On "AppCompatActivity" it's red and says 'Cannot resolve symbol'. On 'findViewById' and 'onCreate' and 'setContentView' it says 'cannot resolve method'.

This is my code:

package com.example.simon.id8;

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

public class MainActivity extends AppCompatActivity { // Declare our View variables private TextView mFactTextView; private Button mShowFactButton;

protected void onCreate(Bundle savedInstanceState) {

    //Assign the Views from the Layour file to the corresponding variables
   mFactTextView = findViewById(R.id.factTextView);
   mShowFactButton = findViewById(R.id.showFactButton);

    View.OnClickListener listener = new View.OnClickListener() {
        public void onClick(View v) {
            //The button was clicked, so update the fact TextView with a new fact
            String fact = "Ostriches can run faster than horses.";





Terence Davis
Terence Davis
4,819 Points

What IDE are you using? I've found that sometimes certain commands or features are depreciated in different IDE's

1 Answer

Android Studio