如何在android中添加图标到actionbar [英] how to add icon to actionbar in android

问题描述

我需要在操作栏中添加一个图标，我的代码不会在操作栏中显示图标。它显示的是一个带有三个点的图标，当我点击它时，它通过点击它显示回来执行我指定的操作。这是我的以下代码



menu1.xml

< item 
 android：id =   @ + id / action_back 
 android：orderInCategory =   100 
 android：showAsAction =  始终 
 android：icon =   @ drawable / back 
 android：title =   返回 /> 

活动

  @覆盖 
  public  < span class =code-keyword> boolean  onCreateOptionsMenu（菜单菜单） {
 MenuInflater inflater = getMenuInflater（）; 
 inflater.inflate（R.menu.menu1，menu）; 
 返回 true; 
} 
  @覆盖 
  public   boolean  onOptionsItemSelected（MenuItem item）{
  if （item.getItemId（）== R.id.action_back）{
 Toast.makeText（getApplicationContext（），  Teritary，Toast.LENGTH_SHORT）.show（ ）; 
} 
 
 
  return  true; 
} 
 

解决方案

android：orderInCategory 属性指示菜单项在显示时在菜单中出现的顺序。菜单项按orderInCategory整数值的升序从左到右排列（即1,2,3 ... - >从左到右）。



android：orderInCategory 实际上有两种用途。

=>对于ActionBar中的菜单项。根据升序，项目将在ActionBar中从左到右显示。



=>对于溢出菜单中的菜单项。溢出菜单项将从上到下显示，具体取决于您指定的升序。



所以，（只是一个疯狂的猜测）使它 android：orderInCategory =1，你很高兴。



-KR

< blockquote>



我相信现在的问题是兼容性。



在你的 menu.xml 文件，创建一个新的 XML命名空间。



这变为：

 <  菜单    xmlns：android   =  http://schemas.android.com/apk/res/android\" 
   
           xmlns：mynamespace   =  http://schemas.android.com/apk/res-auto >  
 
 < span class =code-keyword><   item   
   
                   android：id   =  @ + id / action_back  
  < span class =code-attribute> 
                   android：orderInCategory   =  100  
   
                   android：icon  < span class =code-keyword> =  @ drawable / back  
   
                   android：title   = 返回  
   
                   android：showAsAction   = 始终  
   
                   mynamespace：sh​​owAsAction   = 始终    /  >  
 <   / menu  >  

Java 源代码可保持不变。

i need to add an icon to the action bar and my code does not show icon in the action bar. what it shows is an icon with three dots and when i click on it it shows back by clicking it performs my specified operation.here is my following code

menu1.xml

<item
        android:id="@+id/action_back"
        android:orderInCategory="100"
        android:showAsAction="always"
        android:icon="@drawable/back"
        android:title="Back"/>

activity

@Override
     public boolean onCreateOptionsMenu(Menu menu) {
       MenuInflater inflater = getMenuInflater();
       inflater.inflate(R.menu.menu1, menu);
       return true;
     }
    @Override
     public boolean onOptionsItemSelected(MenuItem item) {
        if(item.getItemId()==R.id.action_back){
            Toast.makeText(getApplicationContext(), "Teritary", Toast.LENGTH_SHORT).show();
        }


       return true;
     }

解决方案

The android:orderInCategory attribute dictates the order in which the menu items will appear within the menu when it is displayed. The menu items are arranged from left to right in ascending order of integer value of orderInCategory (i.e. 1,2,3... -> left to right).

android:orderInCategory is actually useful in two ways.
=> For menu items in ActionBar. Items will appear from left to right in ActionBar depending on the ascending order.

=> For menu items in overflow menu. Overflow menu items will be displayed from top to bottom depending upon the ascending order you have specified.

So, (Just a wild guess) make it android:orderInCategory="1", and you are good to go.

-KR

Hi,

I believe now the problem is compatibility.

In your menu.xml file, create a new XML Namespace.

This becomes:

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

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

    <item

        android:id="@+id/action_back"

        android:orderInCategory="100"

        android:icon="@drawable/back"

        android:title="Back"

        android:showAsAction="always"

        mynamespace:showAsAction="always" />
</menu>

The Java Source code could remain as it is.

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