小编and*_*Guy的帖子

我正在使用设计支持来创建标签.我也ViewPager用于可跳转标签.

现在,我不知道如何在标签中仅使用图标而不是文本.我试图找出但没有取得任何成功.

我的代码:

Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    viewPager = (ViewPager) findViewById(R.id.pager);
    setupViewPager(viewPager);
    setupTablayout();
}

private void setupTablayout() {
    tabLayout = (TabLayout) findViewById(R.id.tabLayout);
    tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
    tabLayout.setupWithViewPager(viewPager);
}

class MyPagerAdapter extends FragmentPagerAdapter {

    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

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

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size(); …

在我的应用程序中,我使用的是Toolbar.现在我希望标题(标签)显示在工具栏的中心.当未显示主页按钮(后退按钮)时,标题位于中央,但是当后退按钮在那里时,文本从中心移动得更远.那我该怎么做呢？

XML

<android.support.v7.widget.Toolbar
        android:id="@+id/toolbar_list_detail"
        style="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/green">

        <TextView
            android:id="@+id/tv_ld_header"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Hello"
            android:gravity="center"
            android:textColor="#fff"
            android:textSize="@dimen/textSize"
            android:textStyle="bold" />

</android.support.v7.widget.Toolbar>

码

toolbar = (Toolbar) findViewById(R.id.toolbar_list_detail);
setSupportActionBar(toolbar);
tvHeader = (TextView) toolbar.findViewById(R.id.tv_ld_header);
//rlToolbar = (RelativeLayout) toolbar.findViewById(R.id.rl_toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
final Drawable upArrow = getResources().getDrawable(R.drawable.back);
getSupportActionBar().setHomeAsUpIndicator(upArrow);

在我的应用程序中,我使用支持库中的TabLayout和视图pager.我有3个片段.假设我在fragA中有一个按钮,点击后将我带到fragB.I成功地去了fragB但是唯一的问题是制表符仍然在fragA.

码

 private void setupTablayout() {


        tabLayout = (TabLayout) findViewById(R.id.tabLayout);
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
        tabLayout.setupWithViewPager(viewPager);
        viewPager.setCurrentItem(1, true);

        tabLayout.getTabAt(0).setIcon(R.drawable.archive).setText("");
        tabLayout.getTabAt(1).setIcon(R.drawable.status_1).setText("");
        tabLayout.getTabAt(2).setIcon(R.drawable.settings).setText("");

        tvHeader.setText("STATUS");

        tabLayout.setOnTabSelectedListener(this);
        //tabLayout.setOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager));


    }

    @Override
    public void onTabSelected(TabLayout.Tab tab) {

        viewPager.setCurrentItem(tab.getPosition());
        switch (tab.getPosition()) {
            case 0:

                tab.setIcon(R.drawable.archive_1).setText("");
                tvHeader.setText("ARCHIVES");
                tvDate.setVisibility(View.GONE);
                ivRefresh.setVisibility(View.VISIBLE);

                break;
            case 1:
                tab.setIcon(R.drawable.status_1).setText("");
                tvHeader.setText("STATUS");
                tvDate.setVisibility(View.VISIBLE);
                ivRefresh.setVisibility(View.VISIBLE);
                break;
            case 2:
                tab.setIcon(R.drawable.settings_1).setText("");
                tvHeader.setText("SETTINGS");
                tvDate.setVisibility(View.GONE);
                ivRefresh.setVisibility(View.GONE);
                break;


        }
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {


        viewPager.setCurrentItem(tab.getPosition());
        switch (tab.getPosition()) {
            case 0:

                tab.setIcon(R.drawable.archive).setText("");

                break;
            case 1:
                tab.setIcon(R.drawable.status).setText("");
                break;
            case 2:
                tab.setIcon(R.drawable.settings).setText("");
                break;


        }

    }


    @Override …