I have 2 buttons in one activity. When I click on them, I make new intents so I can make a new screen. One works, the other doesn't

Question

My java code:

 Button equations = (Button) findViewById(R.id.algebrabutton);
    equations.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Intent myIntent = new Intent(view.getContext(), 
             algebra_activity.class);
            startActivityForResult(myIntent, 0);
        }
    });


    Button word = (Button) findViewById(R.id.wordbutton);
    word.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view1) {
            Intent myIntent1 = new Intent(view1.getContext(), 
               word_activity.class);
            startActivityForResult(myIntent1, 0);
        }
    });

Error log :

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lawrencej.mathappdeluxe/com.exampl‌​e.lawrencej.mathappd‌​eluxe.algebra_activi‌​ty}: 
java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor.
Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead

When I click the word button, it works fine and displays a new screen. When I click the equations button, the app crashes. Am I doing something wrong?

Answer 1

Use this in your styles code .

<style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
</style>

And in your manifest

<activity
    android:name=".algebra_activity"
    android:theme="@style/AppTheme.NoActionBar">