[英]Programmatically display actionbar overflow
I have an actionbar with a menu. 我有一个带有菜单的操作栏。 When you click the button, the menu shows up and all is well with the world.
当您单击该按钮时,菜单就会显示出来,一切都变得非常美好。
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:id="@+id/reload"
android:title="@string/reload"
android:alphabeticShortcut="r"
android:numericShortcut="1"
android:titleCondensed="Rload"></item>
<group android:id="@+id/adv" android:menuCategory="secondary">
...options
</group>
</menu>
However, I just got told that we have a client whose device has some sort of other menu bar that is displayed over the current one so they can't access the menu. 但是,我刚刚得知我们有一个客户端,其设备的其他菜单栏显示在当前菜单栏上,因此他们无法访问该菜单。 So I added a button on the webview with a javascriptinterface to tell my Activity to display the menu programmatically.
因此,我在Web视图上添加了带有javascript界面的按钮,以告诉我的Activity以编程方式显示菜单。 I can get there just fine, but I can't for the life of me figure out how to display the menu as if the menu button was pressed.
我可以到达那里,但是我一生都无法弄清楚如何显示菜单,就像按下菜单按钮一样。
I tried doing something like this: 我试图做这样的事情:
private void showMenu() {
try{
actionbar.show();
MenuItem menu = (MenuItem) findViewById(R.id.adv);
menu.expandActionView();
}
catch(Exception e){
Log.e(LOG_CAT,"Unable to inflate menu");
}
}
but I'm getting a null pointer exception 但是我得到一个空指针异常
java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.view.MenuItem.expandActionView()' on a null object reference
It seems like what I'm trying to do should be trivially easy, but it may be that I'm just doing something boneheaded instead. 似乎我想做的事很容易,但是可能我只是在做一些笨拙的事情。
EDIT I don't actually want to just show R.id.adv, I would like to show the whole menu so that should probably be findViewById(R.menu.menu_main)
instead, where menu_main
is the name of the file that the above xml is defined in. 编辑我实际上并不想只显示R.id.adv,我想显示整个菜单,因此应该改为
findViewById(R.menu.menu_main)
,其中menu_main
是上述文件的名称定义为xml。
findViewById
looks in the view hierarchy of the activity, not the menu. findViewById
查找活动的视图层次结构,而不是菜单。 You need to get the items you need right after your menu is created: 创建菜单后,您需要立即获取所需的项目:
Edit: 编辑:
Didn't think it's possible but it is. 没想到有可能,但是有可能。 With the help of this answer here's how you can do it:
借助此答案 ,您可以执行以下操作:
View mOverflow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final View decor = getWindow().getDecorView();
decor.post(new Runnable() {
@Override
public void run() {
ArrayList<View> results = new ArrayList<>();
decor.findViewsWithText(results, "OVERFLOW",
View.FIND_VIEWS_WITH_CONTENT_DESCRIPTION);
if (results.size() == 1) {
mOverflow = results.get(0);
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
private void showMenu() {
actionbar.show();
mOverflow.performClick();
}
And in your styles.xml
: 并在您的
styles.xml
:
<style name="AppTheme" parent="android:Theme.Holo">
<item name="android:actionOverflowButtonStyle">@style/Widget.ActionButton.Overflow</item>
</style>
<style name="Widget.ActionButton.Overflow" parent="@android:style/Widget.Holo.ActionButton.Overflow">
<item name="android:contentDescription">OVERFLOW</item>
</style>
findViewsWithText
requires API 14+, however the answer I linked, has a solution for lower APIs. findViewsWithText
需要API 14+,但是我链接的答案为较低的API提供了解决方案。
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