如何在 Android 中创建动态选项卡并为每个片段添加不同的功能？

Question

我知道如何创建静态选项卡，使用 volley 在 android 中获取数据并在每个片段中工作，但是如何使用 JSON 创建动态选项卡并在每个 tabs 上存储不同的详细信息。就像第一个标签存储 "मुख्य समाचार" 来自不同 Web 服务的图像和详细信息。 我所知道的是创建这样的标签：

public class TabActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;


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

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    viewPager = (ViewPager) findViewById(R.id.container);
    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);
}

private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFrag(new OneFragment(), "ONE");
    adapter.addFrag(new TwoFragment(), "TWO");

    viewPager.setAdapter(adapter);
}

class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

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

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

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

    public void addFrag(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {

          return mFragmentTitleList.get(position);
        }
    }
}

我想将"cat_name"存储为 TABS 名称。我该怎么做？我正在尝试但无法正确修复它如何获取数据并存储为选项卡名称并为每个选项卡动态创建片段并单独处理每个选项卡。

这是我获取标签名称的网络服务。

{
    "status": 200,
    "message": "Purchase order updated successfully",
    "data": {
        "page_title": "Home | Welcome",
        "menu": [
            {
                "cat_id": "1",
                "cat_name": "मुख्य समाचार",
                "description": ""             
            },
            {
                "cat_id": "2",
                "cat_name": "राजनीती ",
                "description": ""
            }

编辑

我如何处理每个单独的选项卡，如下图所示：

Answer 1

你可以这样做。

public class TabActivity extends AppCompatActivity {

private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
// Fragment List
private final List<Fragment> mFragmentList = new ArrayList<>();
// Title List
private final List<String> mFragmentTitleList = new ArrayList<>();
private ViewPagerAdapter adapter;


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

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    viewPager = (ViewPager) findViewById(R.id.container);
    initTitle();

    // edited , you can use multiple titles and one Fragment
    for (int i = 0; i < mFragmentTitleList.size(); i++) {
        mFragmentList.add(new OneFragment());
    }

    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);
    // Tab ViewPager setting
    viewPager.setOffscreenPageLimit(mFragmentList.size());
    tabLayout.setupWithViewPager(viewPager);
    tabLayout.setTabsFromPagerAdapter(adapter);
}

/**
 * load title data ,it muest below ViewPagerAdapter initialize
 */
private void initTitle() {
    String response = "{\n" +
            "    \"status\": 200,\n" +
            "    \"message\": \"Purchase order updated successfully\",\n" +
            "    \"data\": {\n" +
            "        \"page_title\": \"Home | Welcome\",\n" +
            "        \"menu\": [\n" +
            "            {\n" +
            "                \"cat_id\": \"1\",\n" +
            "                \"cat_name\": \"मुख्य समाचार\",\n" +
            "                \"description\": \"\"             \n" +
            "            },\n" +
            "            {\n" +
            "                \"cat_id\": \"2\",\n" +
            "                \"cat_name\": \"राजनीती \",\n" +
            "                \"description\": \"\"\n" +
            "            }";

    try {
        JSONObject jsonObject = new JSONObject(response);
        int status = jsonObject.getInt("status");
        if (status == 200) {
            JSONObject data = jsonObject.getJSONObject("data");
            JSONArray menu = data.getJSONArray("menu");
            for (int i = 0; i < menu.length(); i++) {
                String cat_name = menu.getJSONObject(i).getString("cat_name");
                mFragmentTitleList.add(cat_name);
            }
        } else {
            for (int i = 0; i < mFragmentList.size(); i++) {
                mFragmentTitleList.add("no title");
            }
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }
}

private void setupViewPager(ViewPager viewPager) {

    adapter = new ViewPagerAdapter(getSupportFragmentManager(), mFragmentList, mFragmentTitleList);

    viewPager.setAdapter(adapter);
}

/**
 * ViewPagerAdapter setting
 */
class ViewPagerAdapter extends FragmentPagerAdapter {
    private List<Fragment> mFragmentList = new ArrayList<>();
    private List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager fm, List<Fragment> fragments, List<String> titleLists) {
        super(fm);
        this.mFragmentList = fragments;
        this.mFragmentTitleList = titleLists;
    }

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

    @Override
    public int getCount() {
        return mFragmentList == null ? 0 : mFragmentList.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}
}

希望能帮到你。