Android 更改片段时更改活动菜单

我有一个

main活动

，有三个选项卡，在我的android应用程序中使用

ViewPager

和pagerslidingtastrip库

问题是，当片段更改（即选项卡更改）时，如何更改

MainActivity

的菜单

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每个选项卡都有不同的菜单。如何执行此操作？

在打开菜单资源之前，应在ViewPager中使用的每个片段中覆盖创建选项菜单，并使用menu.clear（）

您可以检查如何在本文档中使用此功能

---

尝试“在运行时更改菜单项”一章。

在我的例子中，我使用了两个片段……您只需要添加一个片段

碎片

它连接到布局登录

片段基本相同，只是布局不同

。。。 CreateView上的公共视图（布局、充气机、视图组容器、捆绑包保存状态）{

它连接到布局寄存器

然后我们有了TabsPagerAdapter

public class TabsPagerAdapter extends FragmentPagerAdapter {

    public TabsPagerAdapter(FragmentManager fm)
    {
        super(fm);
    }

    @Override
    public Fragment getItem(int index) {

        switch (index) {
        case 0:
            // 1 fragment activity
            return new LoginFragment();
        case 1:
            // 2 fragment activity
            return new RegisterFragment();

        }

        return null;
    }

    @Override
    public int getCount() {
        // get item count - equal to number of tabs
        return 2;
    }

}

你在这里所说的一切

    public class MainActivity extends FragmentActivity implements ViewPager.OnPageChangeListener, TabHost.OnTabChangeListener,ActionBar.TabListener {

    private ViewPager mViewPager;
    private TabsPagerAdapter mAdapter;
    private TabHost mTabHost;
    private String[] tabs = { "1.Fragment", "2.Fragment"};

    private TabHost.TabContentFactory mTabFactory = new TabHost.TabContentFactory() {
        @Override
        public View createTabContent(String tag) {
            View v = new View(MainActivity.this);
            v.setMinimumHeight(0);
            v.setMinimumWidth(0);
            return v;
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.view_bottomtabs);
        mViewPager = (ViewPager) findViewById(R.id.viewPager);
        mViewPager.setOnPageChangeListener(this);

        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
        mViewPager.setAdapter(mAdapter);
        mTabHost = (TabHost) findViewById(android.R.id.tabhost);
        mTabHost.setup();
        mTabHost.setOnTabChangedListener(this);
        for (String tab_name : tabs){
            TabHost.TabSpec spec =mTabHost.newTabSpec(tab_name);
            spec.setIndicator(tab_name);
            spec.setContent(mTabFactory);
            mTabHost.addTab(spec);
        }

    }



    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {
        mTabHost.setCurrentTab(position);
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }

    @Override
    public void onTabChanged(String tabId) {
        int position = -1;
        if (tabId.contains("1.Fragment")) {
            position = 0;
        } else if (tabId.contains("2.Fragment")) {
            position = 1;
        }
        mViewPager.setCurrentItem(position);
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // on tab selected
        // show respected fragment view
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    }


}

---

我希望这有助于

在此处共享您的代码，以更好地帮助您

public class TabsPagerAdapter extends FragmentPagerAdapter {

    public TabsPagerAdapter(FragmentManager fm)
    {
        super(fm);
    }

    @Override
    public Fragment getItem(int index) {

        switch (index) {
        case 0:
            // 1 fragment activity
            return new LoginFragment();
        case 1:
            // 2 fragment activity
            return new RegisterFragment();

        }

        return null;
    }

    @Override
    public int getCount() {
        // get item count - equal to number of tabs
        return 2;
    }

}

    public class MainActivity extends FragmentActivity implements ViewPager.OnPageChangeListener, TabHost.OnTabChangeListener,ActionBar.TabListener {

    private ViewPager mViewPager;
    private TabsPagerAdapter mAdapter;
    private TabHost mTabHost;
    private String[] tabs = { "1.Fragment", "2.Fragment"};

    private TabHost.TabContentFactory mTabFactory = new TabHost.TabContentFactory() {
        @Override
        public View createTabContent(String tag) {
            View v = new View(MainActivity.this);
            v.setMinimumHeight(0);
            v.setMinimumWidth(0);
            return v;
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.view_bottomtabs);
        mViewPager = (ViewPager) findViewById(R.id.viewPager);
        mViewPager.setOnPageChangeListener(this);

        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
        mViewPager.setAdapter(mAdapter);
        mTabHost = (TabHost) findViewById(android.R.id.tabhost);
        mTabHost.setup();
        mTabHost.setOnTabChangedListener(this);
        for (String tab_name : tabs){
            TabHost.TabSpec spec =mTabHost.newTabSpec(tab_name);
            spec.setIndicator(tab_name);
            spec.setContent(mTabFactory);
            mTabHost.addTab(spec);
        }

    }



    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {
        mTabHost.setCurrentTab(position);
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }

    @Override
    public void onTabChanged(String tabId) {
        int position = -1;
        if (tabId.contains("1.Fragment")) {
            position = 0;
        } else if (tabId.contains("2.Fragment")) {
            position = 1;
        }
        mViewPager.setCurrentItem(position);
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // on tab selected
        // show respected fragment view
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    }


}