我实际上无法定义问题，这就是问题就是这样的原因。
作为一个团队，我们正在制作一个使用网站RSS的新闻应用程序，我的工作是在项目中添加“文本到语音”选项，以便只读取新闻标题。代码如下。我们正在使用TabActivity。
问题是我无法获取精确的数据。例如，当您处于“每日”标签时，它会开始读取“体育”标签，这是之后的标签，其他一些标签会在此之前开始阅读标签等。
public class MainActivity extends AppCompatActivity implements NewsResultListener {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
private Speaker speakerManager;
private ArrayList<News> titleListStable = new ArrayList<>();
private static ArrayList<News> titleList = new ArrayList<>();
private static ArrayList<ArrayList<News>> newsList = new ArrayList<>();
private int selectedPage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
speakerManager = new Speaker(this);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
titleListStable = titleList;
Toast.makeText(getApplicationContext(), "" + position , Toast.LENGTH_LONG).show();
selectedPage = position;
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
}
@Override
protected void onDestroy() {
super.onDestroy();
if(speakerManager != null)
{
speakerManager.shutdown();
}
}
@Override
public void onSuccess(ArrayList<News> news) {
}
@Override
public void onFail() {
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment implements NewsResultListener {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
private RecyclerView rvNews;
private RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager mLayoutManager;
private ArrayList<News> dataset;
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
rvNews = (RecyclerView) rootView.findViewById(R.id.rvNews);
mLayoutManager = new LinearLayoutManager(getContext());
rvNews.setLayoutManager(mLayoutManager);
dataset = new ArrayList<>();
adapter = new NewsAdapter(dataset, getActivity());
rvNews.setAdapter(adapter);
switch (getArguments().getInt(ARG_SECTION_NUMBER)) {
case 0:
new RssFeedParser(this).execute("guncel");
break;
case 1:
new RssFeedParser(this).execute("spor");
break;
case 2:
new RssFeedParser(this).execute("ekonomi");
break;
case 3:
new RssFeedParser(this).execute("turkiye");
break;
case 4:
new RssFeedParser(this).execute("dunya");
break;
case 5:
new RssFeedParser(this).execute("kultur-sanat");
break;
case 6:
new RssFeedParser(this).execute("politika");
break;
case 7:
new RssFeedParser(this).execute("bilim-teknoloji");
break;
case 8:
new RssFeedParser(this).execute("yasam");
break;
case 9:
new RssFeedParser(this).execute("saglik");
break;
case 10:
new RssFeedParser(this).execute("analiz-haber");
break;
case 11:
new RssFeedParser(this).execute("gunun-basliklari");
break;
}
//TextView textView = (TextView) rootView.findViewById(R.id.section_label);
//textView.setText(getString(R.string.section_format, ));
return rootView;
}
@Override
public void onSuccess(ArrayList<News> news) {
for(News item : news)
{
dataset.add(item);
}
titleList=dataset;
newsList.add(dataset);
adapter.notifyDataSetChanged();
}
@Override
public void onFail() {
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return PlaceholderFragment.newInstance(position);
}
@Override
public int getCount() {
// Show 3 total pages.
return 12;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "GÜNCEL";
case 1:
return "SPOR";
case 2:
return "EKONOMİ";
case 3:
return "TÜRKİYE";
case 4:
return "DÜNYA";
case 5:
return "KÜLTÜR SANAT";
case 6:
return "POLİTİKA";
case 7:
return "BİLİM TEKNOLOJİ";
case 8:
return "YAŞAM";
case 9:
return "SAĞLIK";
case 10:
return "ANALİZ HABER";
case 11:
return "GÜNÜN BAŞLIKLARI";
}
return null;
}
}
public void imageButton(View v){
for(News i: titleListStable){
String title = i.getTitle();
speakerManager.speak(title);
}
}
}
public class Speaker {
private TextToSpeech mTextToSpeech;
private boolean mIsTTSEnabled = true;
public Speaker(final MainActivity act){
mTextToSpeech = new TextToSpeech(act, new TextToSpeech.OnInitListener() {
@Override
public void onInit(int i) {
if(i == TextToSpeech.SUCCESS){
mTextToSpeech.setLanguage(new Locale("TR-tr"));
switch (mTextToSpeech.isLanguageAvailable(new Locale("TR-tr")))
{
case TextToSpeech.LANG_MISSING_DATA:
case TextToSpeech.LANG_NOT_SUPPORTED:
Toast.makeText(act, "Cihazda Türkçe konuşma sentezi desteklenmemektedir.", Toast.LENGTH_SHORT).show();
default:
break;
}
}else{
mIsTTSEnabled = false;
}
}
});
}
public void speak(final String announce){
if(mIsTTSEnabled){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
mTextToSpeech.speak(announce, TextToSpeech.QUEUE_ADD, null, "");
}
else
{
mTextToSpeech.speak(announce, TextToSpeech.QUEUE_FLUSH, null);
}
}
}
public void shutdown(){
if(mTextToSpeech != null)
{
mTextToSpeech.stop();
}
}
}
注意：如果您想要覆盖整个代码，请点击; https://github.com/dnkilic/AnadoluAjansi
答案 0 :(得分：0)
这是ViewPager的默认行为，我们可以使用setOffscreenPageLimit自定义此行为，但我们再次无法将限制设置为小于1.
设置应保留在页面两侧的页数 处于空闲状态的视图层次结构中的当前页面。页面超出此范围 在需要时，将从适配器重新创建限制。
这是作为优化提供的。如果您事先知道这个号码 您将需要支持或具有延迟加载机制的页面 放在你的页面上，调整这个设置可以带来好处 感知到的分页动画和交互的平滑性。如果你有 少量页面（3-4），您可以一次保持活动状态， 在新创建的视图子树的布局中花费的时间会减少 用户来回翻页。
您应该保持此限制，特别是如果您的网页很复杂 布局。此设置默认为1.
如果你试图设置小于1的限制（例如 mViewPager.setOffscreenPageLimit（0）; ），你应该在LogCat中收到关于此的警告，例如：
Requested offscreen page limit 0 too small; defaulting to 1
希望这对你有所帮助。