Question

我在我的Android应用程序中使用Tab Activity，我想更改我打开应用程序时出现的第一个选项卡，成为最后一个选项卡，但是选项卡的顺序将保持不变（向右滑动以获取到第一个标签）。所以为了改变我添加到清单

的布局方向

android:supportsRtl="true"

以及我的主要活动

android:layoutDirection="rtl"

我应该添加/更改什么？

非常感谢

编辑：这是我的页面适配器代码：

    @Override
public Fragment getItem(int index) {

    switch (index) {
        case 0:
            //
            return new Tab1Fragment();
        case 1:
            //
            return new Tab2Fragment();
        case 2:
            //
            return new Tab3Fragment();
        case 3:
            //
            return new Tab4Fragment();
        case 4:
            //
            return new Tab5Fragment();
    }

    return null;
}

主要活动

public class MainActivity extends FragmentActivity implements
    ActionBar.TabListener {

private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
// Tab titles
private String[] tabs = { "Tab1", "Tab2", "Tab3","Tab4","Tab5" };

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // 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) {
        }
    });
}

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

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

@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
public static boolean isRTL(Locale locale) {
    final int directionality = Character.getDirectionality(locale.getDisplayName().charAt(0));
    return directionality == Character.DIRECTIONALITY_RIGHT_TO_LEFT ||
            directionality == Character.DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC;
}

Answer 1

使用它来了解您是否使用RTL：

 public static boolean isRTL(Locale locale) {
    final int directionality = Character.getDirectionality(locale.getDisplayName().charAt(0));
    return directionality == Character.DIRECTIONALITY_RIGHT_TO_LEFT ||
           directionality == Character.DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC;
}

只需在开头选择适当的标签即可。喜欢：

Locale current = getResources().getConfiguration().locale;
    if(isRTL(current)) {
    getActionBar().setSelectedNavigationItem(4);
    }`else {
    getActionBar().setSelectedNavigationItem(0);

}

将应用程序更改为从右到左 - Android

1 个答案: