2

I am trying to make a second Toolbar, next to the one I have in my top bar. Basically there is a Button and when this is pressed, a bar pops up in the window. The user should be able to read something on the bar and can push a Button. Right now I am trying to just get text on there. But that doesn't seem to work.

.java function: (called when some button is pushed, this shows the toolbar)

public void showDialogue() {
    //Set popupscherm as view
    View v = getLayoutInflater().inflate(R.layout.popupscherm,null);
    AlertDialog.Builder adb = new AlertDialog.Builder(GraphActivity.this);
    adb.setView(v);
    // Find the toolbar view inside the activity layout
    toolbar = (Toolbar) findViewById(R.id.toolbar);
    toolbar.setTitle("test"); //Here it gives the error
    AlertDialog alert = adb.create();

    alert.show();

popupscherm.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:minHeight="?attr/actionBarSize"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?attr/colorPrimary">
    </android.support.v7.widget.Toolbar>

    </LinearLayout>

error:

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.Toolbar.setTitle(java.lang.CharSequence)' on a null object reference

Phantômaxx
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aze45sq6d
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1 Answers1

6

Use 

 View v = getLayoutInflater().inflate(R.layout.popupscherm,null);
 toolbar = (Toolbar) v.findViewById(R.id.toolbar);

instead of

toolbar = (Toolbar) findViewById(R.id.toolbar);

because view v has the popupscher.xml view otherwise with this findViewById(R.id.toolbar); you are trying to find the toolbar in the current set layout of activity which is different from popupscherm.xml

Pavneet_Singh
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