Cannot resolve method and LinearLayout

Question

I'm having problems with my code... Before, it worked, then I added some simple lines in the layout and now I have lots of erros. I'm trying to learn by myself how to do an app for my schools libray so I'm no pro. Thanks for any help.

The error here is "Cannot resolve R"

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

    majorOb = (Spinner) findViewById(R.id.spinnerMaj);
    yearOb = (Spinner) findViewById(R.id.spinnerYear);
    semesterOb = (Spinner) findViewById(R.id.spinnerSem);
    classOB = (Spinner) findViewByID(R.id.spinnerClass);
    button1 = (Button) findViewById(R.id.button1);
    tv1 = (TextView) findViewById(R.id.textview1);
    Resources res = getResources();
    array1 = res.getStringArray(R.array.Books);`

The error here is: Element LinearLayout doesnt have the required attribute: layout_height adn layout_width

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.marcosbiblio.projetofinal.MainActivity">
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">

for "Cannot resolve R", clean and rebuild the project from build option — Sumit Pathak, Apr 13 '16 at 13:20
Possible duplicate of [R cannot be resolved - Android error](http://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error) — Rovanion, Apr 13 '16 at 13:31

score 0 · Answer 1 · answered Apr 13 '16 at 13:19

Try this

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.marcosbiblio.projetofinal.MainActivity"
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"></LinearLayout>

Cannot resolve method and LinearLayout

1 Answers1