Add ActionBar Buttons and androidactionbar to Android

Add ActionBar Buttons and androidactionbar to Android

1. Create an Xml file and label menu in the res/menu folder, and set item

<? Xml version = "1.0" encoding = "UTF-8"?> <Myapp: menu xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: myapp = "http://schemas.android.com/apk/res-auto"> <! -- Id: button Id --> <! -- Icon: button icon --> <! -- Title: button text --> <! -- ShowAsAction: button display status --> <item android: id = "@ + id/buttonIcon" android: icon = "@ drawable/ic_near_me_white" android: title = "navigation" myapp: showAsAction = "always"/> </myapp: menu>

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2. Reference this menu. xml in Activity

  @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.buttons,menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        switch (item.getItemId()) {            case R.id.buttonIcon:                                 Toast.makeText(OrderDetailActivity.this,"hello world",Toast.LENGTH_SHORT).show();                        break;        }        return super.onOptionsItemSelected(item);    }

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Android 3.0 or later

• Always-> always display in Action bar;
• IfRoom-> If the ActionBar has enough space, it is displayed;
• Never-> not displayed in Action Bar, collapsed in Over Flow;
• WithText-> the menu item is displayed with its icon and menu text)

 

Android 2.0 or later

Namespace needs to be introduced

• Add a custom namespace to menu. xml

Xmlns: myapp = "http://schemas.android.com/apk/res-auto"

• Specify the namespace before ShowAsAction

     myapp:showAsAction="always"