我们选择做这些事并不是因为它们很容易，而是因为它们很难。因为如果我不能这样做，我的用户界面就会被解开。

将下面给出的NavigationItemLongPressInterceptor类导入到您的项目中。

NavigationView的菜单项声明为正常，另外两个属性用于添加长按行为。

xmlns:app="http://schemas.android.com/apk/res-auto"

tools:showIn="navigation_view">

android:id="@+id/nav_item_1"

android:icon="@drawable/ic_item_1"

android:title="Item 1"

android:checkable="true"

app:actionViewClass=

"com.twoplay.netplayer.controls.NavigationItemLongPressInterceptor"

app:showAsAction="always"

/>

android:id="@+id/nav_item_2"

android:icon="@drawable/ic_item_2"

android:title="Item 2"

android:checkable="true"

app:actionViewClass=

"com.twoplay.netplayer.controls.NavigationItemLongPressInterceptor"

app:showAsAction="always"

/>

将NavigationItemLongPressInterceptor.OnNavigationItemLongClickListener的实现添加到您的活动，并实现onNavigationItemLongClick方法：

public class MainActivity extends MediaActivity

implements

NavigationView.OnNavigationItemSelectedListener,

NavigationItemLongPressInterceptor.OnNavigationItemLongClickListener

. . .

@Override

public void onNavigationItemLongClick(

NavigationItemLongPressInterceptor.SelectedItem selectedItem,

View view)

{

// supply your NavigationView as an argument.

int menItemId = selectedItem.getItemId(mNavigationView);

switch (id) {

...

case R.id.nav_local_device:

case R.id.nav_upnp_devices: {

showNavigationItemSetAsHomePopupMenu(id,view);

}

break;

}

}

}

您可能需要将com.twoplay.netplayer.controls.NavigationItemLongPressInterceptor添加到您的proguard规则中。

navigation item long press interceptor.Java:

package com.twoplay.netplayer.controls;

import android.app.Activity;

import android.content.Context;

import android.content.ContextWrapper;

import android.util.AttributeSet;

import android.view.Menu;

import android.view.MenuItem;

import android.view.SubMenu;

import android.view.View;

import android.view.ViewGroup;

import com.google.android.material.navigation.NavigationView;

import androidx.annotation.Nullable;

/**

* Attach a long-click handler to a menu item in a NavigationView menu.

*

* To handle long-click of a Navigator menu item, declare the item as normal, and append

* app:actionViewClass="com.twoplay.netplayer.controls.NavigationItemLongPressInterceptor" and

* app:showAsAction="always" attributes:

*

*

* xmlns:app="http://schemas.android.com/apk/res-auto"

* >

*

*

*

* android:id="@+id/nav_item_1"

* android:icon="@drawable/ic_item_1"

* android:title="Item 1"

* android:checkable="true"

* app:actionViewClass=

* "com.twoplay.netplayer.controls.NavigationItemLongPressInterceptor"

* app:showAsAction="always"

*

*

*

* Your Application class must implement

* in order to receive notification of long pressed menu items.

*

* You can retrieve the item id of the menu by calling on the

* provided as an arguement to

*

* />

*

*/

@SuppressWarnings("unused")

public class NavigationItemLongPressInterceptor extends View {

public NavigationItemLongPressInterceptor(Context context) {

super(context);

init();

}

public NavigationItemLongPressInterceptor(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

init();

}

public NavigationItemLongPressInterceptor(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

init();

}

private void init()

{

setVisibility(View.INVISIBLE);

setLayoutParams(new ViewGroup.LayoutParams(0,0));

}

public interface OnNavigationItemLongClickListener {

void onNavigationItemLongClick(SelectedItem itemHandle, View view);

}

public static class SelectedItem {

private final View actionView;

private SelectedItem(View actionView) {

this.actionView = actionView;

}

public int getItemId(NavigationView navigationView)

{

return getItemId(navigationView.getMenu());

}

private int getItemId(Menu menu) {

for (int i = 0; i < menu.size(); ++i) {

MenuItem item = menu.getItem(i);

if (item.getActionView() == actionView) {

return item.getItemId();

}

SubMenu subMenu = item.getSubMenu();

if (subMenu != null) {

int itemId = getItemId(subMenu);

if (itemId != -1) {

return itemId;

}

}

}

return -1;

}

}

@Override

protected void onAttachedToWindow() {

super.onAttachedToWindow();

View parent = getMenuItemParent();

parent.setOnLongClickListener(new View.OnLongClickListener() {

@Override

public boolean onLongClick(View v) {

OnNavigationItemLongClickListener receiver = getReceiver();

if (receiver == null)

{

throw new RuntimeException("Your main activity must implement NavigationViewLongPressInterceptorView.OnNavigationItemLongClickListener");

}

View parent = getMenuItemParent();

receiver.onNavigationItemLongClick(

new SelectedItem(NavigationItemLongPressInterceptor.this),parent);

return true;

}

});

}

private Activity getActivity() {

Context context = getContext();

while (context instanceof ContextWrapper) {

if (context instanceof Activity) {

return (Activity)context;

}

context = ((ContextWrapper)context).getBaseContext();

}

return null;

}

private OnNavigationItemLongClickListener getReceiver() {

Activity activity = getActivity();

if (activity == null) return null;

if (activity instanceof OnNavigationItemLongClickListener)

{

return (OnNavigationItemLongClickListener)activity;

}

return null;

}

private View getMenuItemParent() {

View parent = (View)getParent();

while (true)

{

if (parent.isClickable())

{

return parent;

}

parent = (View) parent.getParent();

}

}

}

此代码针对androidx，但它可以简单地向后移植到AppCompat。只需删除androidx导入，并将其替换为相应的AppCompat导入。希望旧版本的NavigationView以同样的方式布置actionViews。

使用'androidx.appcompat：appcompat：1.0.2'，'com.google.android.material：material：1.0.0'进行测试。我有理由相信它是版本安全的。如果getMenuItemParent()needs调整其他AppCompat版本，请告诉我，我将在此处纳入更改。