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? [英] How to create dynamic tabs and add different functionality to each fragment in Android?

问题描述

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 上存储不同的详细信息标签.就像第一个标签商店 "मुख्य समाचार" 来自不同网络服务的图像和详细信息.我所知道的是创建这样的标签:

I knew how to create static Tabs, work with a volley to get data in android and work in each fragment but how to create dynamic tabs using JSON and store different details on each of tabs. Like first tab store "मुख्य समाचार" images and details which are coming from different web service. What I know is to create tabs like this:

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.

I want to store "cat_name"as TABS name. how can I do it?I am trying it but not able to fixed it properly how to get data and store as tab name and dynamically create fragments for each tab and work on each tab individually.

这是我获取标签名称的网络服务.

Here is my web service for getting Tabs name.

{
    "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:

How can I work with each individual tabs like in this image:

推荐答案

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 = "{
" +
            "    "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": ""
" +
            "            }";

    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.

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