Java 如何在android的操作栏中创建按钮
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How to create button in Action bar in android
提问by Manikanta Siripella
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.
我正在开发 Android 应用程序，我需要在操作栏中有一个按钮。这些是我的活动和 java 文件。所以，我需要在我的工具栏右侧有一个按钮。提前致谢。
content_b2_bdeliveries.xml:
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:
活动_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:
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by tibbi
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
它在https://developer.android.com/guide/topics/ui/menus.html#xml正确描述。您可以在“menu”目录下创建一个 menu.xml 文件，该文件与“drawable”和“layout”目录处于同一级别
回答by Onur ?evik
In your activity class, override the following methods if they are not there by default:
在您的活动类中，如果默认情况下不存在以下方法，请覆盖它们：
// 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
我的菜单文件
<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by Ahmad Payan
Someone had answered this question before
之前有人回答过这个问题
You have two steps to do that:
你有两个步骤来做到这一点：
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; }
在 res/menu 中创建菜单（将其命名为 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>覆盖 onCreateOptionsMenu 和 inflate 菜单
@Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.my_menu, menu); return true; }
回答by Ashish Ranjan
Make a xml file for your menu in res/menudirectory ( menu_main.xmlin this case):
在res/menu目录中为您的菜单创建一个 xml 文件（menu_main.xml在本例中）：
<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 :
然后在您的活动类中添加这些方法：
@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);
}
回答by Gautam Malik
If you want to customize UI of your ActionBar, then you can use Toolbar as ActionBar. Here are the steps to do the same :
如果您想自定义 ActionBar 的 UI，则可以将 Toolbar 用作 ActionBar。以下是执行相同操作的步骤：
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>
在您的活动布局 xml 中添加以下代码作为 AppBarLayout 的子项。
<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>通过在您的 Activity onCreate() 方法中添加以下代码，将您的 Toolbar 设为 ActionBar。
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true);在 AndroidManifest.xml 中，将以下主题添加到您的活动中：
android:theme="@style/AppTheme.NoActionBar"在styles.xml中添加以下代码：
<style name="AppTheme.NoActionBar"> <item name="windowActionBar">false</item> <item name="windowNoTitle">true</item> </style>
