單擊列表項時，ViewPager變為空白

Question

我有一張下面的桌子。 我的問題是：在列表視圖中顯示三個列表

Letter

Number

Word

但是，當我單擊任何列表項時，查看尋呼機的滑動視圖將顯示但仍為空白，那里沒有數據。 並且也沒有頁面標題顯示。 在Logcat中沒有錯誤顯示。

這是ListNavAdapter

public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    ArrayAdapter arrayAdapter;
    ArrayList<String> listItem = new ArrayList<>();
    final ListView listView = (ListView) view.findViewById(R.id.list);
    SQLiteDatabase sqLiteDatabase = SqliteDatabase.getInstance(this.getContext()).getWritableDatabase();
    Cursor cursor = sqLiteDatabase.rawQuery("SELECT HEADER FROM MyData group by HEADER", new String[]{});

    if (cursor.getCount() == 0) {
        Toast.makeText(getActivity(), "No Data to show", Toast.LENGTH_LONG).show();
    } else {
        while (cursor.moveToNext()) {
            listItem.add(cursor.getString(0));
        }
        arrayAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, listItem);
        listView.setAdapter(arrayAdapter);
    }
    listView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            Intent intent=new Intent(getActivity(), SwipeNav.class);
            intent.putExtra(ID_EXTRA, (String)adapterView.getItemAtPosition(i));
            startActivity(intent);
        }
});

這是SwipeNav活動

if (getIntent().hasExtra(ListNavAdapter.ID_EXTRA)) {
    String myInt = (getIntent().getStringExtra(ListNavAdapter.ID_EXTRA));
    listSwipePagerAdapter = new ListSwipePagerAdapter(getSupportFragmentManager(), this);
    viewPager = (ViewPager) findViewById(R.id.pager);
    viewPager.setAdapter(listSwipePagerAdapter);

這是從ListSwipePagerAdapter

public Fragment getItem(int i) {
    String myInt=ListNavAdapter.ID_EXTRA;
    ArrayList<String> listItem = new ArrayList<String>();
    SQLiteDatabase sqLiteDatabase = SqliteDatabase.getInstance(context).getWritableDatabase();
    Cursor cursor = sqLiteDatabase.rawQuery("SELECT NAME FROM MyData WHERE HEADER=?", new String[]{"myInt"});
    if (cursor.getCount() == 0) {
    } else {
        while (cursor.moveToNext()) {
            listItem.add(cursor.getString(0));
        }
    }
    Object[] mStringArray = listItem.toArray();
    Fragment fragment = new AFragment();
    Bundle args = new Bundle();
    assert mStringArray != null;
    args.putString(AFragment.ARG_OBJECT, (String)mStringArray[i]);
    fragment.setArguments(args);
    return fragment;
}

@Override
public int getCount() {
    String myInt=ListNavAdapter.ID_EXTRA;
    ArrayList<String> listItem = new ArrayList<>();
    SQLiteDatabase sqLiteDatabase = SqliteDatabase.getInstance(context).getWritableDatabase();
    Cursor cursor = sqLiteDatabase.rawQuery("SELECT NAME FROM MyData WHERE HEADER=?", new String[]{"myInt"});
    while (cursor.moveToNext()) {
        listItem.add(cursor.getString(cursor.getColumnIndex("NAME")));
    }
    return listItem.size();
}

@Override
public CharSequence getPageTitle(int position) {

    //return tabTitleArray[position];
    return "Object " + (position + 1);
}

這是AFragment類

Bundle args = getArguments();
((TextView) rootView.findViewById(R.id.text1)).setText(args.getString(ARG_OBJECT));
return rootView;

Answer 1

我已經解決了我的問題。

為了在SwipeNav活動中顯示數據，數據應從ListNavAdapter傳遞到ListSwipePagerAdapter。 但是意圖已發送到SwipeNav。 HEADER未顯示在ListSwipePagerAdapter中。 因此，ViewPager變為空白。

我已經解決了使用共享首選項的問題。