Xtykutl

I was also facing the same problem, but the actual error was, i forgot to introduce toolbar in java activity

under AppCompactActivity, under on create method define your toolbar by id and call setSupportActionBar(ToolBar);

Example is bellow:

public class secondActivity extends AppCompatActivity {



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_second);



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

        setSupportActionBar(toolbar);

Try the following:

<menu xmlns:android="http://schemas.android.com/apk/res/android"

      xmlns:tools="http://schemas.android.com/tools"

      xmlns:app="http://schemas.android.com/apk/res-auto"

      tools:context="com.example.lolipoptest.MainActivity" >



<item

    android:id="@+id/action_settings"

    android:orderInCategory="100"

    android:showAsAction="never"

    android:title="@string/action_settings"/>

</menu>

and the Java Code:

@Override

public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.

    getMenuInflater().inflate(R.menu.main, menu);

    return true;

}

Do you have Toolbar in your dashboard layout ?. Call setSupportActionBar(toolbar) in your activity. Use Theme.AppCompat.NoActionBar theme for the activities (If you are using toolbar in it)

import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;

import android.support.v7.widget.Toolbar;

import android.view.Menu;



public class DashboardActivity extends ActionBarActivity {



 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_main);

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

  setSupportActionBar(toolbar);

  getSupportActionBar().setDisplayHomeAsUpEnabled(true);

  getSupportActionBar().setHomeButtonEnabled(true);

}



@Override

 public boolean onCreateOptionsMenu(Menu menu) {

  getMenuInflater().inflate(R.menu.dashboard, menu);

  return super.onCreateOptionsMenu(menu);

 }



@Override

public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();

    if (id == R.id.action_settings) {

        return true;

    }

    return super.onOptionsItemSelected(item);

}

}

Check your styles.

<resources>



<!-- Base application theme. -->

<style name="AppTheme.Base" parent="Theme.AppCompat.NoActionBar">

    <item name="colorPrimary">@color/colorPrimary</item>

    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>

    <item name="android:windowBackground">@color/white</item>

    <item name="colorAccent">@color/colorAccent</item>

</style>



<style name="AppTheme" parent="AppTheme.Base">



</style>



<style name="ToolbarTheme" parent="AppTheme" >

</style>



<color name="light">#FFBB33</color>

<color name="colorPrimary">#FFBB33</color>

<color name="textColorPrimary">#FFBB33</color>

<color name="colorPrimaryDark">#FF8800</color>

<color name="colorAccent">#ff9977</color>

<color name="white">#ffffff</color>



</resources>

Check your layout.

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="match_parent"

android:layout_height="match_parent">



<android.support.v7.widget.Toolbar

    android:id="@+id/toolbar"

    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="wrap_content"

    android:minHeight="?attr/actionBarSize"

    app:titleMarginStart="20dp"

    android:paddingRight="10dp"

    android:background="@color/colorPrimaryDark"

    app:theme="@style/ToolbarTheme" />



<TextView

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_marginLeft="15dp"

    android:text="Hello Toolbar" />



</LinearLayout>

Add theme in your activity in manifest

android:theme="@style/AppTheme"

Try changing:

 ....

xmlns:app="http://schemas.android.com/apk/res-auto" >

 ....

app:showAsAction="ifRoom" 

to:

 ....

xmlns:yourapp="http://schemas.android.com/apk/res-auto" >

 ....

yourapp:showAsAction="ifRoom" 

https://developer.android.com/training/basics/actionbar/adding-buttons.html

If you're using a Toolbar you need to set it as the support action bar in onCreate:

setSupportActionBar(toolbar);

you guys are doing it wrong. you need to inflate your menu in onCreateOptionsMenu of the activity:

 @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.mymenu, menu);

        return super.onCreateOptionsMenu(menu);

    }

If you are inflating your menu from a fragment, e.g. by overriding onCreateOptionsMenu method, make sure to call setHasOptionsMenu(true) in onCreateView of your fragment

The issue is resolved when I changed it to app:showAsAction to android:showAsAction

In my case it was stupid simple.
My toolbar was a child of AppBarLayout, and for some reason, when I was setting a Toolbar with Constraint layout, Toolbar's layout_width xml parameter was set to 0dp. So the toolbar was there, but invisible... (>_<)

So, if nothing from above helped you, just check "layout_width" and "layout_height" parameters.

Hope this will save someone's time :)

Add Icon you want under mipmap folder

Create menu_analysis.xml(under menu folder values.xml)

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

<menu xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    tools:context="com.app.android.ui.dashboard.DashboardActivity">

         <item

            android:id="@+id/action_scan_qr"

            android:icon="@mipmap/ic_menu_options"

            android:title=""

            app:showAsAction="always" />

</menu>

Now onPrepareOptionMenu under your Java class

@Override

public boolean onPrepareOptionsMenu(final Menu menu) {

    getMenuInflater().inflate(R.menu.menu_analysis, menu);

    return super.onCreateOptionsMenu(menu);

}

Although the accepted answer does work, it causes my menu items rendered twice. As I've just worked around this, try somethings as:

1. remember to return true; instead of super.onCreateOptionsMenu(menu);
   
   


2. remember to set support action bar setSupportActionBar(findViewById(R.id.toolbar))
   


3. You might want to turn off default app title if you use customized toolbar: getSupportActionBar().setDisplayShowTitleEnabled(false)
   

Use setSupportActionBar(toolbar) in onCreate Method.

I had written like,

MenuInflater(this).inflate(R.menu.my_menu, menu)

But, I changed the code like,

menuInflater.inflate(R.menu.my_menu, menu)

and it worked!

(I'm using kotlin and this code was written in Activity)