这是我的代码
home.xml
<item
android:id="@+id/action_shopping_cart"
android:actionLayout="@layout/action_bar_cart_button"
android:showAsAction="ifRoom"
android:title="Shopping Cart" />
<item
android:id="@+id/action_notifications"
android:actionLayout="@layout/action_bar_notifications_button"
android:showAsAction="ifRoom"
android:title="Notifications" />
<item
android:id="@+id/menu_overflow"
android:orderInCategory="100"
android:icon="@drawable/ic_action_overflow"
android:showAsAction="always"
android:title="OverFlow">
<menu>
<item
android:id="@+id/action_my_account"
android:orderInCategory="100"
android:showAsAction="never"
android:title="My Account" />
<item
android:id="@+id/action_current_orders"
android:orderInCategory="100"
android:showAsAction="never"
android:title="My Orders" />
<item
android:id="@+id/action_wish_list"
android:orderInCategory="100"
android:showAsAction="never"
android:title="My Wishlist" />
<item
android:id="@+id/action_contact_us"
android:orderInCategory="100"
android:showAsAction="never"
android:title="Contact Us" />
<item
android:id="@+id/action_logout"
android:orderInCategory="100"
android:showAsAction="never"
android:title="logout" />
</menu>
</item>
我想要View“menu_overflow”我怎么能得到它？
我试过以下方式：
Activity.java代码
public boolean onCreateOptionsMenu(Menu menu){
final MenuItem item = menu.findItem(R.id.menu_overflow);
View view = (View) findViewById(R.id.menu_overflow);
new MaterialShowcaseView.Builder(this)
.setTarget(mOverFlowIcon)
.setRadius(10)
.setMaskColour(Color.argb(150,0))
.setContentText("Find Your Wishlist Here") // optional but starting animations immediately in onCreate can make them choppy
.setDismissOnTouch(true)
.show();
return super.onCreateOptionsMenu(menu);
}
但是返回视图是null.
请帮忙… thanx
解决方法
你在onCreateOptionsMenu中夸大菜单吗？看来,当执行onCreateOptionsMenu时,xml通胀会被添加到事件队列中,而不是立即膨胀.这是执行findViewById()时导致空指针的原因.尝试将视图查找放在Handler中.处理程序中的代码将添加到消息队列中,因此将在菜单膨胀后执行.这将解决您的空指针.它看起来像这样：
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main,menu);
new Handler().post(new Runnable() {
@Override
public void run() {
View view = (View) findViewById(R.id.menu_overflow);
new MaterialShowcaseView.Builder(this)
.setTarget(view)
.setRadius(10)
.setMaskColour(Color.argb(150,0))
.setContentText("Find Your Wishlist Here") // optional but starting animations immediately in onCreate can make them choppy
.setDismissOnTouch(true)
.show();
}
});
return true;
}
