Android,如何创建选项菜单

Question

在这里我尝试制​​作选项菜单,但菜单没有显示在屏幕上,所以请指导我在哪里做错了...

MenuTest.java

public class MenuTest extends Activity {
   @Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater=getMenuInflater();
    inflater.inflate(R.menu.more_tab_menu, menu);
    return super.onCreateOptionsMenu(menu);

}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch(item.getItemId())
    {
    case R.id.feeds:
        break;
    case R.id.friends:
        break;
    case R.id.about:
        break;
    }
    return true;
}
}

我的XML文件是more_tab_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu
xmlns:android="http://schemas.android.com/apk/res/android">
<item
    android:id="@+id/feeds"
    android:title="Feeds"/>
<item
    android:id="@+id/friends"
    android:title="Friends"/>
<item
    android:id="@+id/about"
    android:title="About"/>
</menu>

请指导我,

Answer 1

public class MenuTest extends Activity {

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.more_tab_menu, menu);

        // return true so that the menu pop up is opened
        return true; 
    }
}

并且不要忘记按下模拟器或设备上的菜单按钮或图标

Answer 2

请看:==

private int group1Id = 1;

int homeId = Menu.FIRST;
int profileId = Menu.FIRST +1;
int searchId = Menu.FIRST +2;
int dealsId = Menu.FIRST +3;
int helpId = Menu.FIRST +4;
int contactusId = Menu.FIRST +5;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    menu.add(group1Id, homeId, homeId, "").setIcon(R.drawable.home_menu);
    menu.add(group1Id, profileId, profileId, "").setIcon(R.drawable.profile_menu);
    menu.add(group1Id, searchId, searchId, "").setIcon(R.drawable.search_menu);
    menu.add(group1Id, dealsId, dealsId, "").setIcon(R.drawable.deals_menu);
    menu.add(group1Id, helpId, helpId, "").setIcon(R.drawable.help_menu);
    menu.add(group1Id, contactusId, contactusId, "").setIcon(R.drawable.contactus_menu);

    return super.onCreateOptionsMenu(menu); 
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case 1:
        // write your code here
        Toast msg = Toast.makeText(MainHomeScreen.this, "Menu 1", Toast.LENGTH_LONG);
        msg.show();
        return true;

    case 2:
        // write your code here
        return true;

    case 3:
        // write your code here
        return true;

    case 4:
        // write your code here
        return true;

    case 5:
        // write your code here
        return true;

    case 6:
        // write your code here
        return true;

    default:
        return super.onOptionsItemSelected(item);
    }
}

Answer 3

更改您的onCreateOptionsMenu方法以返回true.引用文档:

您必须返回true才能显示菜单; 如果你返回false,它将不会显示.

Answer 4

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    new MenuInflater(this).inflate(R.menu.folderview_options, menu);
    return (super.onCreateOptionsMenu(menu));
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    if (item.getItemId() == R.id.locationListRefreshLocations) {
        Cursor temp = helper.getEmployee(active_employeeId);
        String[] matches = new String[1];
        if (temp.moveToFirst()) {
            matches[0] = helper.getEmployerID(temp);
        }
        temp.close();               
        startRosterReceiveBackgroundTask(matches);
    } else if (item.getItemId()==R.id.locationListPrefs) {
        startActivity(new Intent(this, PreferencesUnlockScreen.class));
        return true;
    }           
    return super.onOptionsItemSelected(item);
}   

Answer 5

您可以创建如下所示的选项菜单：

菜单 XML 代码：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/Menu_AboutUs"
        android:icon="@drawable/ic_about_us_over_black"
        android:title="About US"/>
    <item
        android:id="@+id/Menu_LogOutMenu"
        android:icon="@drawable/ic_arrow_forward_black"
        android:title="Logout"/>
</menu>

如何从 MENU XML 获取菜单（将菜单 XML 转换为 java）：

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.my_options_menu,menu);
        return super.onCreateOptionsMenu(menu);
    }

如何从菜单中获取所选项目：

@Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()){

            case R.id.Menu_AboutUs:
                //About US
                break;

            case R.id.Menu_LogOutMenu:
                //Do Logout
                break;
        }
        return super.onOptionsItemSelected(item);
    }