如何在android中的Action栏中创建按钮

Question

我在Android应用程序上工作,我需要一个操作栏中的按钮.这些是我的活动和java文件.所以,我需要一个工具栏右侧的按钮.提前致谢.

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));
            }
    }
}

Answer 1

// 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);
}

你的mymenu.xml应该在res/menu目录下(如果你没有res/menu,只需在res里面创建一个名为"menu"的目录),如下所示:

<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>

Answer 2

以下是完成它的步骤：

1. 在 res/menu 中创建一个菜单（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>
   

2. 覆盖 onCreateOptionsMenu 并扩充菜单

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

访问：如何在 ActionBar(Android) 中添加按钮？

Answer 3

如果要自定义ActionBar的UI,则可以使用工具栏作为ActionBar.以下是执行相同操作的步骤:

1. 在活动布局xml中添加以下代码作为AppBarLayout的子代.

   <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>
   

2. 通过在Activity onCreate()方法中添加以下代码,将工具栏设置为ActionBar.

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

3. 在AndroidManifest.xml中,将以下主题添加到您的活动中:

   android:theme="@style/AppTheme.NoActionBar"
   

4. 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>
   

Answer 4

它在https://developer.android.com/guide/topics/ui/menus.html#xml中有正确描述。您可以在“menu”目录中创建一个menu.xml文件，该文件与“drawable”和“layout”目录处于同一级别