How to create button in Action bar in android

问题

I am working on android application where i need a button in action bar. These are my activity and java files. So, i need a button at right side of my tool bar. Thanks in advance.

content_b2_bdeliveries.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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.ideabiz.riderapplication.ui.B2BDeliveriesActivity"
tools:showIn="@layout/activity_b2_bdeliveries">
//remaining code;
</LinearLayout>

activity_b2_bdeliveries.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.ideabiz.riderapplication.ui.B2BDeliveriesActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_b2_bdeliveries" />

</android.support.design.widget.CoordinatorLayout>

B2BDeliveriesActivity.java:

public class B2BDeliveriesActivity extends AppCompatActivity {
private final String TAG_NAME="B2BActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_b2_bdeliveries);
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    ActionBar actionBar = getSupportActionBar();
    //Log.d(TAG_NAME,actionBar.toString());
    if (actionBar != null) {
        try {
            actionBar.setDisplayHomeAsUpEnabled(true);
            } catch (Exception e) {
                Crashlytics.logException(e);
                Log.d(TAG_NAME, "Null Pointer from setDisplayHomeAsUpEnabled" + e.getMessage());
                Utilities.issueTokenUpload("Null Pointer from setDisplayHomeAsUpEnabled" + e, sharedPreferences.getInt("tripId", 999999), sharedPreferences.getString("driverPhoneNo", "9999999999"), sharedPreferences.getString("driverName", "default"), getResources().getString(R.string.version));
            }
    }
}

回答1:

In your activity class, override the following methods if they are not there by default:

// create an action bar button
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // R.menu.mymenu is a reference to an xml file named mymenu.xml which should be inside your res/menu directory. 
    // If you don't have res/menu, just create a directory named "menu" inside res
    getMenuInflater().inflate(R.menu.mymenu, menu);
    return super.onCreateOptionsMenu(menu);
}

// handle button activities
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if (id == R.id.mybutton) {
    // do something here
    }
    return super.onOptionsItemSelected(item);
}

mymenu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto">
<item
    android:id="@+id/mybutton"
    android:title=""
    app:showAsAction="always"
    android:icon="@drawable/mybuttonicon"
    />
</menu>

回答2:

If you want to customize UI of your ActionBar, then you can use Toolbar as ActionBar. Here are the steps to do the same :

Add below code as a child of AppBarLayout in your activity layout xml.

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

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:weightSum="1">

            <TextView
                android:id="@+id/title"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="ActionBar Title"/>

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

        </LinearLayout>

    </android.support.v7.widget.Toolbar>

Make your Toolbar as ActionBar by adding the below code in your Activity onCreate() method.

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

In AndroidManifest.xml, add following theme to your activity:
```
android:theme="@style/AppTheme.NoActionBar"
```

In styles.xml add following code:

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

回答3:

Someone had answered this question before

You have two steps to do that:

Create menu in res/menu (Name it my_menu.xml)

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
    android:id="@+id/action_cart"
    android:icon="@drawable/cart"
    android:orderInCategory="100"
    android:showAsAction="always"/> 
</menu>

Override onCreateOptionsMenu and inflate menu

@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.my_menu, menu);
return true;
}

Visit : How to add button in ActionBar(Android)?

回答4:

its described properly at https://developer.android.com/guide/topics/ui/menus.html#xml . You can create a menu.xml file at "menu" directory, which is at the same level as "drawable" and "layout" directories

回答5:

Make a xml file for your menu in res/menu directory ( menu_main.xml in this case):

<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.example.rashish.myapplication.MainActivity">
    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:title="Button title"
        android:icon="@drawable/buttonicon"
        app:showAsAction="never" />
</menu>

then add these methods in your activity class :

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here.
    int id = item.getItemId();

    if (id == R.id.action_settings) {
        //process your onClick here
        return true;
    }

    return super.onOptionsItemSelected(item);
}

来源：https://stackoverflow.com/questions/38158953/how-to-create-button-in-action-bar-in-android

标签

java

android

xml

button

android-actionbar