Android上下文菜单选项始终添加到所有上下文菜单中

Question

我正在使用Context Menu创建一个基本的Android项目，用于活动的各种视图。我创建了4个不同的上下文菜单选项，3个用于屏幕上的不同视图，1个用于父布局。

代码如下：

public class MainActivity extends AppCompatActivity {

TextView tV;
Button button;
CoordinatorLayout baseLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    tV = (TextView) findViewById(R.id.textView);
    button = (Button) findViewById(R.id.button);
    baseLayout = (CoordinatorLayout) findViewById(R.id.base_layout);

    registerForContextMenu(fab);
    registerForContextMenu(tV);
    registerForContextMenu(button);
    registerForContextMenu(baseLayout);
}

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    menu.setHeaderTitle("Context Menu");
    if (v.getId() == R.id.fab) 
        getMenuInflater().inflate(R.menu.menu_context_fab, menu);
    } else if (v.getId() == R.id.textView) {
        menu.add(v.getId(), 0, Menu.NONE, "Option 1");
        menu.add(v.getId(), 1, Menu.NONE, "Option 2");
        menu.add(v.getId(), 2, Menu.NONE, "Option 3");
    } else if (v.getId() == R.id.button) {
        menu.setHeaderTitle("Setting Menu");
        menu.add(v.getId(), 0, Menu.NONE, "Setting 1");
        menu.add(v.getId(), 1, Menu.NONE, "Setting 2");
        menu.add(v.getId(), 2, Menu.NONE, "Setting 3");
    } else if (v.getId() == R.id.base_layout) {
        menu.setHeaderTitle("Base Menu");
        menu.add(v.getId(), 0, Menu.NONE, "Preference 1");
        menu.add(v.getId(), 1, Menu.NONE, "Preference 2");
        menu.add(v.getId(), 2, Menu.NONE, "Preference 3");
    }

}

@Override
public boolean onContextItemSelected(MenuItem item) {
    if (item.getTitle().equals("Action 1")) {
        Toast.makeText(getApplicationContext(), "Action 1 pressed", Toast.LENGTH_SHORT).show();
    } else if (item.getTitle().equals("Action 2")) {
        Toast.makeText(getApplicationContext(), "Action 2 pressed", Toast.LENGTH_SHORT).show();
    } else if (item.getTitle().equals("Action 3")) {
        Toast.makeText(getApplicationContext(), "Action 3 pressed", Toast.LENGTH_SHORT).show();
    } else if (item.getGroupId() == R.id.textView) {
        if (item.getItemId() == 0) {
            Toast.makeText(getApplicationContext(), "Option 1 pressed", Toast.LENGTH_SHORT).show();
        } else if (item.getItemId() == 1) {
            Toast.makeText(getApplicationContext(), "Option 2 pressed", Toast.LENGTH_SHORT).show();
        } else if (item.getItemId() == 2) {
            Toast.makeText(getApplicationContext(), "Option 3 pressed", Toast.LENGTH_SHORT).show();
        }
    } else if (item.getGroupId() == R.id.button) {
        if (item.getItemId() == 0) {
            Toast.makeText(getApplicationContext(), "Setting 1 pressed", Toast.LENGTH_SHORT).show();
        } else if (item.getItemId() == 1) {
            Toast.makeText(getApplicationContext(), "Setting 2 pressed", Toast.LENGTH_SHORT).show();
        } else if (item.getItemId() == 2) {
            Toast.makeText(getApplicationContext(), "Setting 3 pressed", Toast.LENGTH_SHORT).show();
        }
    } else if (item.getGroupId() == R.id.base_layout) {
        if (item.getItemId() == 0) {
            Toast.makeText(getApplicationContext(), "Preference 1 pressed", Toast.LENGTH_SHORT).show();
        } else if (item.getItemId() == 1) {
            Toast.makeText(getApplicationContext(), "Preference 2 pressed", Toast.LENGTH_SHORT).show();
        } else if (item.getItemId() == 2) {
            Toast.makeText(getApplicationContext(), "Preference 3 pressed", Toast.LENGTH_SHORT).show();
        }
    }
    return true;
}
}

这应该在每种情况下创建不同的上下文菜单，但是，每当我长按屏幕上的任何视图时，布局上下文菜单（首选项选项）的菜单选项也包含在其中。

例如，如果我长按按钮，弹出的上下文菜单包含：

Setting 1
Setting 2
Setting 3
Preference 1
Preference 2
Preference 3

我不明白为什么我的布局菜单选项被添加到所有其他上下文菜单

menu_content_fab.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  tools:context="com.osahub.rachit.contextmenu.MainActivity">
<item
    android:id="@+id/action_1"
    android:title="Action 1"
    app:showAsAction="never"/>
<item
    android:id="@+id/action_2"
    android:title="Action 2"
    app:showAsAction="never"/>
<item
    android:id="@+id/action_3"
    android:title="Action 3"
    app:showAsAction="never"/>