How To Get Action View Of Menu Item?

问题

This is My Code

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>

I want the View "menu_overflow" how can I get that?

I tried Following way :

Activity.java code

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, 0, 0))
                        .setContentText("Find Your Wishlist Here") // optional but starting animations immediately in onCreate can make them choppy
                        .setDismissOnTouch(true)
                        .show();
    return super.onCreateOptionsMenu(menu);
}

But is returning view is null.

Please help...thanx

回答1:

Are you inflating the menu in onCreateOptionsMenu? It appears that when onCreateOptionsMenu is executed, the xml inflation is added to the event queue, rather than inflating immediately. This is what causes your null pointer when you execute findViewById(). Try putting your view lookup inside a Handler. The code within the Handler is added to the message queue and will therefore be executed after the menu is inflated. This will resolve your null pointer. It will look something like this:

@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, 0, 0))
                    .setContentText("Find Your Wishlist Here") // optional but starting animations immediately in onCreate can make them choppy
                    .setDismissOnTouch(true)
                    .show();
        }
    });
    return true;
}

回答2:

You can get a reference to the MenuItem by overriding the onPrepareOptionsMenu(Menu) method:

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    MenuItem actionViewItem = menu.findItem(R.id.your_menu_item);
    return super.onPrepareOptionsMenu(menu);
}

If you want a reference to the ActionView you can do this with the method MenuItemCompat.getActionView(MenuItem):

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    MenuItem actionViewItem = menu.findItem(R.id.your_menu_item);
    View v = MenuItemCompat.getActionView(actionViewItem);
    return super.onPrepareOptionsMenu(menu);
}

回答3:

Did you try this?

@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);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.

        switch (item.getItemId()){
            case R.id.action_shopping_cart:
                Toast.makeText(this, "action_shopping_cart", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_notifications:
                Toast.makeText(this, "action_notifications", Toast.LENGTH_SHORT).show();
                break;
            case R.id.menu_overflow:
                Toast.makeText(this, "menu_overflow", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_my_account:
                Toast.makeText(this, "action_my_account", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_current_orders:
                Toast.makeText(this, "action_current_orders", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_wish_list:
                Toast.makeText(this, "action_wish_list", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_contact_us:
                Toast.makeText(this, "action_contact_us", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_logout:
                Toast.makeText(this, "action_logout", Toast.LENGTH_SHORT).show();
                break;



        }



        return super.onOptionsItemSelected(item);
    }

Take care of the name of your xml (that is home.xml)

回答4:

Try with:

<item
    android:id="@+id/menu_overflow"
    android:orderInCategory="100"
    android:icon="@drawable/ic_action_overflow"
    android:title="OverFlow"
    app:showAsAction="always"
    app:actionViewClass="android.widget.ImageButton">

Note this lines:

    app:showAsAction="always"
    app:actionViewClass="android.widget.ImageButton"

来源：https://stackoverflow.com/questions/33301667/how-to-get-action-view-of-menu-item