我如何在选项卡中添加图标而不是在选项卡适配器中添加图标，它在 android 中扩展了 FragmentPagerAdapter？ 我不想在我的项目中使用操作栏

有什么帮助吗？？

 public class TabsPagerAdapter extends FragmentPagerAdapter {

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

    private final int[] icons = {R.drawable.home,R.drawable.buddies,R.drawable.notification,R.drawable.history};

    @Override
    public CharSequence getPageTitle(int position) {
        if(position == 0)
            return "Home";
        else if(position == 1)
            return "Buddies";
        else if(position == 2)
            return "History ";
        else
            return "Notifications";
    }

    @Override
    public Fragment getItem(int index) {

        switch (index) {
            case 0:
                HomeFragment home = new HomeFragment();
                return home;
            case 1:
                return new BuddiesFragment();
            case 2:
                return new HistoryFragment();
            case 3:
                return new NotificationsFragment();
        }

        return null;
    }


    @Override
    public int getCount() {
        return 4;
    }

}

我也试过这个方法，但是没有用

@覆盖 public int getPageIconResId(int position) { 返回图标[位置]；

    @Override
    public boolean isViewFromObject(View view, Object o) {
        return o == view;
    }

最佳答案

我使用矢量绘图作为我的标签图像，这只适用于 API >21。 但我相信您可以以相同的方式使用图像可绘制对象。

这是我的代码:

class MyPagerAdapter extends FragmentPagerAdapter {

    private String[] tabText = getResources().getStringArray(R.array.tabs);

    public MyPagerAdapter(FragmentManager fm) {
        super(fm);
        tabText = getResources().getStringArray(R.array.tabs);

    }

    @Override
    public Fragment getItem(int position) {

        Fragment fragment=null;

        if (position == 0)
            fragment = new FragmentA();
        if (position == 1)
            fragment = new FragmentB();
        if (position == 2)
            fragment=new FragmentC();

        return fragment;
    }




    @Override
    public CharSequence getPageTitle(int position) {

        SpannableString spannableString = null;

        if (position == 0) {
            //use the MrVector library to inflate vector drawable inside tab
            Drawable drawable = MrVector.inflate(getResources(), R.drawable.vector_add);
            //set the size of drawable to 36 pixels
            drawable.setBounds(0, 0, 36, 36);
            ImageSpan imageSpan = new ImageSpan(drawable);
            //to make our tabs icon only, set the Text as blank string with white space
            spannableString = new SpannableString(" ");
            spannableString.setSpan(imageSpan, 0, spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        if (position == 1) {
            //use the MrVector library to inflate vector drawable inside tab
            Drawable drawable = MrVector.inflate(getResources(), R.drawable.vector_list);
            //set the size of drawable to 36 pixels
            drawable.setBounds(0, 0, 36, 36);
            ImageSpan imageSpan = new ImageSpan(drawable);
            //to make our tabs icon only, set the Text as blank string with white space
            spannableString = new SpannableString(" ");
            spannableString.setSpan(imageSpan, 0, spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        if (position == 2) {
            //use the MrVector library to inflate vector drawable inside tab
            Drawable drawable = MrVector.inflate(getResources(), R.drawable.vector_settings);
            //set the size of drawable to 36 pixels
            drawable.setBounds(0, 0, 36, 36);
            ImageSpan imageSpan = new ImageSpan(drawable);
            //to make our tabs icon only, set the Text as blank string with white space
            spannableString = new SpannableString(" ");
            spannableString.setSpan(imageSpan, 0, spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        return spannableString;
    }

    @Override
    public int getCount() {
        return 3;
    }

附图片:

 @Override
    public CharSequence getPageTitle(int position) {

        SpannableStringBuilder sb = new SpannableStringBuilder(" ");

        if (position == 0) {
            Drawable drawable = getDrawable(R.drawable.ic_action_add);
            drawable.setBounds(0, 0, 48, 48);
            ImageSpan imageSpan = new ImageSpan(drawable);
            //to make our tabs icon only, set the Text as blank string with white space
            sb.setSpan(imageSpan, 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        if (position == 1) {
            Drawable drawable = getDrawable(R.drawable.ic_action_list_2);
            drawable.setBounds(0, 0, 48, 48);
            ImageSpan imageSpan = new ImageSpan(drawable);
            //to make our tabs icon only, set the Text as blank string with white space
            sb.setSpan(imageSpan, 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }

        return sb;
    }

MrVector 库:https://github.com/telly/MrVector
我用来将 SVG 转换为 VectorDrawable 的工具:http://inloop.github.io/svg2android/

关于android - 将图标添加到扩展 FragmentPagerAdapter 的选项卡适配器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25990931/