菜单活动不起作用

Question

我的应用程序主屏幕上有几个按钮和列表视图。我想在其中添加菜单活动。所以我只是编写了自定义菜单活动并从主屏幕扩展。但不幸的是，当我单击手机上的菜单按钮时，我的自定义菜单不起作用。有什么想法吗？

package com.gokiri.gl.activity;

import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.util.DisplayMetrics;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import com.gokiri.gl.R;
import com.gokiri.gl.screen.GLandMainMenu;
import com.gokiri.gl.screen.SearchScreen;
import com.gokiri.gl.util.Shared;

public class GLandMainActivity extends ListActivity {
    protected Activity act;
    protected int screenWidth, screenHeight;
    protected Bitmap bannerBitmap;

    protected void initActivity(Activity act) {
        this.act = act;

        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        screenWidth = dm.widthPixels;
        screenHeight = dm.heightPixels;
        dm = null;

        Shared.addAcitivity(act);
        setDefaultButton();
    }

    public void setDefaultButton() {

    }

    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_MENU) {
            Shared.removeAcitivity();
            startActivity(new Intent(this, GLandMainMenu.class));
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    private Menu mMenu;

    public boolean onCreateOptionsMenu(Menu menu) {
        this.mMenu = menu;
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return true;
    }

    public boolean onPrepareOptionsMenu(Menu menu) {

        return super.onPrepareOptionsMenu(menu);
    }

    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        switch (item.getItemId()) {
        case R.id.menu_home:
            // act.finish();
            Intent main = new Intent(act, GLandMainMenu.class);
            startActivity(main);
            return true;
        case R.id.menu_search:
            act.finish();
            Intent search = new Intent(act, SearchScreen.class);
            startActivity(search);
            return true;
        case R.id.menu_bookmarks:
            return true;
        case R.id.menu_about:
            return true;
        }
        return super.onMenuItemSelected(featureId, item);
    }
}

从评论中编辑：

<?xml version="1.0" encoding="utf-8"?> 
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@+id/menu_home" 
    android:title="@string/home" 
    android:icon="@drawable/tab_home" />
  <item android:id="@+id/menu_search"
    android:title="@string/search" 
    android:icon="@drawable/tab_search" />
  <item android:id="@+id/menu_bookmarks"
    android:title="@string/bookmark"
    android:icon="@drawable/tab_about" />
  <item android:id="@+id/menu_about"
    android:title="@string/about"
    android:icon="@drawable/tab_about" />
</menu>

Answer 1

据我所知，您用拦截 KeyEvent.KEYCODE_MENU 的 onKeyDown 来阻止 onCreateOptionMenu() 。您不能使用菜单按钮来启动活动和显示菜单（显然）。如果不是那个，请向我们解释什么是 GLandMainMenu 类