在硬件菜单按钮单击操作栏中打开子菜单 [英] Opening submenu in action bar on Hardware menu button click
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问题描述
标题说明了一切.单击硬件菜单按钮时,我想在操作栏中打开一个子菜单
Title explains everything. I want to open a submenu in actionbar when clicking Hardware menu button
这是代码,我第一次单击菜单时它工作正常.每隔一次它就会闪烁(打开并立即关闭)
This is the code and it works fine first time i click menu. Every other time it just flashes(opens and the instantly closes it)
private Menu mainMenu;
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.options, menu);
mainMenu = menu;
return true;
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(event.getAction() == KeyEvent.ACTION_DOWN){
switch(keyCode) {
case KeyEvent.KEYCODE_MENU:
mainMenu.performIdentifierAction(R.id.more, 0);
return true;
}
}
return super.onKeyDown(keyCode, event);
}
这里是 options.xml
and here is options.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="@+id/settings"
android:icon="@drawable/ic_menu_preferences"
android:showAsAction="ifRoom|withText"
android:title="Settings"/>
<item
android:id="@+id/about"
android:icon="@drawable/ic_menu_info_details"
android:showAsAction="ifRoom|withText"
android:title="About"/>
<item
android:id="@+id/more"
android:icon="@drawable/ic_menu_moreoverflow_normal_holo_dark"
android:showAsAction="always|withText"
android:title="More">
<menu>
<item
android:id="@+id/changelog"
android:icon="@drawable/ic_menu_recent_history"
android:showAsAction="ifRoom|withText"
android:title="Changelog"/>
<item
android:id="@+id/update"
android:icon="@drawable/ic_menu_refresh"
android:showAsAction="ifRoom|withText"
android:title="Update Check"/>
<item
android:id="@+id/check"
android:icon="@drawable/ic_menu_help"
android:showAsAction="ifRoom|withText"
android:title="Compatibility Check"/>
</menu>
</item>
</menu>
更新:(解决方案)刚刚将 onKeyDown() 方法更改为 onKeyUp() 现在它坚持了
UPDATE:(Solution) Just changed onKeyDown() method to onKeyUp() and now it sticks
推荐答案
试试这个:
public boolean onCreateOptionsMenu(Menu menu)
{
super.onCreateOptionsMenu(menu);// <--- add this
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.options, menu);
mainMenu = menu;
return true;
}
//override this method instead of onKeyDown()....
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
super.onOptionsItemSelected(item);
int menuId = item.getItemId();
if(menuId == R.id.settings)
{
//do settings
}
//else if(menuId = ...) {....}
return true;
}
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