在ViewPager中設置操作欄標題

Question

我的ViewPager包含許多片段。我在actionBar中顯示片段的標題，我使用下面的代碼來設置標題。因為ViewPager還啟動了相鄰的片段，我在操作欄中看到了下一個片段的標題。應該是什么樣的正確方法來繼續在viewpager的actionbar中設置標題？

private class MyPagerAdapter extends FragmentPagerAdapter {

    private String[] titles = {
            "Titleme", "Titletos", "Titleos", "Titles", "MeTitle5", "Title6",
            "Title7", "Title8"
    };

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

    @Override
    public CharSequence getPageTitle(int position) {
        return titles[position];
    }

    @Override
    public android.support.v4.app.Fragment getItem(int pos) {
        Bundle args = new Bundle();

        switch (pos) {
            case 0:
                currentFragment = new HomeFragment();
                getSupportActionBar().setTitle("HomeFragment");
                break;
            case 1:
                currentFragment = new HomeFragment5();
                getSupportActionBar().setTitle("HomeFragment5");
                break;
            case 2:
                currentFragment = new HomeFragment4();
                getSupportActionBar().setTitle("HomeFragment4");
                break;
            case 3:
                currentFragment = new HomeFragment3();
                getSupportActionBar().setTitle("HomeFragment3");
                break;
            case 4:
                currentFragment = new HomeFragment4();
                getSupportActionBar().setTitle("HomeFragment4");
                break;
            case 5:
                currentFragment = new ChlHome();
                getSupportActionBar().setTitle("ChlHome");
                break;
            case 6:
                currentFragment = new GiFragment();
                getSupportActionBar().setTitle("GiFragment");
                break;
            case 7:
                currentFragment = new FlList();
                getSupportActionBar().setTitle(" FlList");
                break;
            default:
        }
        return currentFragment;
    }

    @Override
    public int getCount() {
        return 8;
    }       
}

根據shkschneider的答案更新

  final ViewPager pager = (ViewPager) findViewById(R.id.viewPager);
        pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
        PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
        tabs.setViewPager(pager);
    pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            pager.setCurrentItem(position);
            switch(position) {
                case 0:

                    getSupportActionBar().setTitle("H");
                    break;
                case 1:
                    getSupportActionBar().setTitle("P");
                    break;
                case 2:
                    getSupportActionBar().setTitle("A");
                    break;
                case 3:
                    getSupportActionBar().setTitle("V");
                    break;
                case 4:
                    getSupportActionBar().setTitle("M");
                    break;
                case 5:
                    getSupportActionBar().setTitle("C");
                    break;
                case 6:
                    getSupportActionBar().setTitle("G");
                    break;
                case 7:
                    getSupportActionBar().setTitle("F");
                    break;
            }

        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });


private class MyPagerAdapter extends FragmentPagerAdapter {

        private String[] titles = {
                "Titleme", "Titletos", "Titleos", "Titles", "MeTitle5", "Title6",
                "Title7", "Title8"
        };

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

        @Override
        public CharSequence getPageTitle(int position) {
            return titles[position];
        }

        @Override
        public android.support.v4.app.Fragment getItem(int pos) {
            Bundle args = new Bundle();

            switch (pos) {
                case 0:
                    currentFragment = new HomeFragment();

                    break;
                case 1:
                    currentFragment = new HomeFragment5();

                    break;
                case 2:
                    currentFragment = new HomeFragment4();

                    break;
                case 3:
                    currentFragment = new HomeFragment3();

                    break;
                case 4:
                    currentFragment = new HomeFragment4();

                    break;
                case 5:
                    currentFragment = new ChlHome();

                    break;
                case 6:
                    currentFragment = new GiFragment();

                    break;
                case 7:
                    currentFragment = new FlList();

                    break;
                default:
            }
            return currentFragment;
        }

        @Override
        public int getCount() {
            return 8;
        }       
    }
}

Answer 1

試試這個......

final ViewPager pager = (ViewPager) findViewById(R.id.viewPager);
            pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
            PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);

            tabs.setViewPager(pager);

           //Use tabs for setting listener
                tabs
                        .setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

                            @Override
                            public void onPageSelected(int position) {
                                // TODO Auto-generated method stub
                                tabs.setNextFocusRightId(position);

                                 actionBar.setTitle(titles[pos]);
                            }

                            @Override
                            public void onPageScrolled(int arg0, float arg1, int arg2) {
                                // TODO Auto-generated method stub

                            }

                            @Override
                            public void onPageScrollStateChanged(int pos) {
                                // TODO Auto-generated method stub

                            }
                        });

Answer 2

試試這段代碼：

viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageSelected(int pos) {
        actionBar.setSelectedNavigationItem(pos);
        actionBar.setTitle(titles[pos]);
    }

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

    }

    @Override
    public void onPageScrollStateChanged(int arg0) {

    }
});

Answer 3

您可以創建標題字符串數組，然后在視圖尋呼機上設置頁面偵聽器，並在onPageScrolled內部執行以下操作：

public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
            getSupportActionBar().setTitle(titles[position]);
        }

Answer 4

每次你的應用想要渲染Fragment都會調用getItem() ，所以標題當然會顯示下一個Fragment 。

相反，您應該使用ViewPager.OnPageChangeListener ：

@Override
public void onPageSelected(final int position) {
    switch (position) {
        case 0:
            getSupportActionBar().setTitle("HomeFragment");
            break ;
        // ...
    }
}

Answer 5

從所有地方刪除行

getSupportActionBar().setTitle("XYZ");

來自你的來源。

僅從getPageTitle方法返回標題。