使用实现 ActionBar.TabListener 的 FragmentActivity 编辑 ActionBar

Question

在我的 android 应用程序中，我正在尝试将图标添加到 FragmentActivity 中的 ActionBar；但是，它仍然是空白的。

我想让操作栏有两个来自 block.xml 的图标

<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=".SetupActivity" >



    <item android:id="@+id/action_overflow"
          android:title="@string/action_settings"
          android:orderInCategory="100"
          android:icon="@drawable/ic_action_overflow"
          app:showAsAction="always" />

    <item android:id="@+id/action_search"
          android:title="@string/search"
          android:orderInCategory="200"
          android:icon="@drawable/ic_action_search"
          app:showAsAction="always" />
</menu>

我正在尝试关注这个：onCreateOptionsMenu not being called on FragmentActivity when run on phone version

这是我的 BlockActivity 类，它扩展了 FragmentActivity。我不确定为什么尽管有 onCreateOptionsMenu 方法却无法编辑 ActionBar。

package com.spicycurryman.getdisciplined10.app;

import android.annotation.TargetApi;
import android.app.FragmentTransaction;
import android.os.Build;
import android.os.Bundle;
import android.app.ActionBar;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuInflater;

import info.androidhive.tabsswipe.adapter.TabsPagerAdapter;


// 



/**
 * Created by Spicycurryman on 6/17/14.
 */
public  class BlockActivity extends FragmentActivity implements
        ActionBar.TabListener {

    private ViewPager viewPager;
    private TabsPagerAdapter mAdapter;
    private ActionBar actionBar;
    // Tab titles
    private String[] tabs = {"Installed", "System", "Custom"};

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.block_apps);


        // Initilization
        viewPager = (ViewPager) findViewById(R.id.pager);
        actionBar = getActionBar();
        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

        viewPager.setAdapter(mAdapter);
        actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Adding Tabs
        for (String tab_name : tabs) {
            actionBar.addTab(actionBar.newTab().setText(tab_name)
                    .setTabListener(this));
        }

        /**
         * on swiping the viewpager make respective tab selected
         * */
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                // on changing the page
                // make respected tab selected
                actionBar.setSelectedNavigationItem(position);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });

    }

    //Here is onCreateOptionsMenu method that should work

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





    @Override
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        viewPager.setCurrentItem(tab.getPosition());

    }

    @Override
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {

    }

    @Override
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {

    }




}

是否应该在单独的 Fragment 中实现 onCreateOptionsMenu？

Answer 1

你没有在你内部调用super.onCreateOptionsMenu(menu); onCreateOptionsMenu 方法，所以这就是它保持空白的原因。

解决方案：

public boolean onCreateOptionsMenu(Menu menu){
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.block, menu);
    return super.onCreateOptionsMenu(menu);
}

也添加这个：

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    return super.onPrepareOptionsMenu(menu);
}

也添加动作：

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_overflow) {
        return true;
    } else if(id == R.id.action_search) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}