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Android Build a Self-Destructing Message Android App Starting the App Adding the Sign Up Screen

J Smillie
J Smillie
39,714 Points
Posted by J Smillie
J Smillie
39,714 Points

In the latest version of Android Studio when replicating what Ben is doing here I get a FATAL EXCEPTION

In this line of code:

  mSignUpTextView = (TextView)findViewById(R.id.signUpText);

what does log cat mean when it tells me that .RelativeLAyout cannot be cast to android.widget.TextView?

This is part of the error message:

   Caused by: java.lang.ClassCastException:
   android.widget.RelativeLayout cannot be cast to
   android.widget.TextView
   at com.wolfonmoon.howl.LoginActivity.onCreate(LoginActivity.java:22)
Gloria Dwomoh
Gloria Dwomoh
13,116 Points

Can you show us line 22 from your LoginActivity.java file, also what have you defined "mSignUpTextView" to be?

J Smillie
J Smillie
39,714 Points
J Smillie
J Smillie
39,714 Points

sure. here is all the code I have edited alongside the video. Line 22 is the first one inside onCreate that begins with mSignUpTextView

protected TextView mSignUpTextView;

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


    mSignUpTextView = (TextView)findViewById(R.id.signUpText);
    mSignUpTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(LoginActivity.this, SignUpActivity.class);
            startActivity(intent);
        }
    });
}

The whole line to the right of '=' is underlined in red and when I hover it says "Unexpected cast to TextView: Layout tag was RelativeLayout"

Gloria Dwomoh
Gloria Dwomoh
13,116 Points

All right, can you also post from your XML file the item with id called signUpText?

J Smillie
J Smillie
39,714 Points
J Smillie
J Smillie
39,714 Points

sure this is the TextView:

   <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/signUp"
    android:id="@+id/signUpText"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true" />

   </RelativeLayout>
Gloria Dwomoh
Gloria Dwomoh
13,116 Points

Try to clean the gradle and run it again, if that doesn't work check if you have set an id on RelativeLayout above and let me know (also post your full XML if possible).

J Smillie
J Smillie
39,714 Points
J Smillie
J Smillie
39,714 Points

Thanks Gloria. I tried cleaning the project and even rebuilding but the error is still present. Just checked for an id in RelativeLayout and it seems I have assigned signUpText to RelativeLayout. I have no idea why I did this. But thank you so much for your help and fast responses!! Would have taken me much longer on my own

Gloria Dwomoh
Gloria Dwomoh
13,116 Points

LOL yeah that's the problem then, you used the same id that's why I asked you to tell me if you have added an id there because I suspected that. You are welcome.