如何整合工具栏

Question

I'm trying to integrate a Toolbar to my existing App. I have the problem that in every tutorial I've found they're using a class like this:

public class MyActivity extends AppCompatActivity 

But I do already have a public class with an 'extends' in it. And as you know, in Java I can not extend two things in one class.

So: how can I solve this problem?

Answer 1

One of the most interesting reasons for moving from ActionBar to Toolbar was to make Toolbar a flexible widget that can be used anywhere in the layouts. You can add a Toolbar to your XML layout file like any other widgets (Button, TextView etc.). I don't know what you are trying to make or do, So as to give a better suggestion. But, As a solution to your question, simply add these lines to your XML layout and that will do it:

<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    app:layout_scrollFlags="scroll|enterAlways"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

Make sure to have Support library dependency in your build.gradle.