已解决 – Android ViewPager和TabLayout无法正常运行
作者：互联网
TabLayout和ViewPager有嵌套片段.每个片段里面都有listview,所以他们可以一起调用,现在我遇到了app处理速度慢的问题.我尝试过一些像凌空图书馆这样的解决方案,但它对我不起作用.更多我发布我的代码所以请指导我做到最好.
MainTabFragment.java
public class MainTabFragment extends Fragment {
public static int position_child_tab = 0, three_childs_tab_position = 0;
static int count = -1;
int position_tab = 0;
Bundle args;
MyTabLayout myTabLayout;
public MainTabFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment MainTabFragment.
*/
// TODO: Rename and change types and number of parameters
public static MainTabFragment newInstance(String param1, String param2) {
return new MainTabFragment();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.main_tab_fragment, container, false);
myTabLayout = (MyTabLayout) view.findViewById(R.id.mainTabLayout);
NonSiwpablePager pager = (NonSiwpablePager) view.findViewById(R.id.pager);
args = getArguments();
if (args != null && args.containsKey("pos_next"))
position_tab = args.getInt("pos_next");
if (args != null && args.containsKey("pos_end"))
position_child_tab = args.getInt("pos_end");
if (position_child_tab != 3) {
three_childs_tab_position = position_child_tab;
} else {
three_childs_tab_position = 0;
}
args = new Bundle();
args.putInt("pos_end", position_child_tab);
ViewPagerAdapter mAdapter = getViewPagerAdapter();
pager.setAdapter(mAdapter);
pager.setOffscreenPageLimit(4);
myTabLayout.setupWithViewPager(pager);
for (int i = 0; i < mAdapter.getCount(); i++) {
View customView = mAdapter.getCustomeView(getActivity(), i);
myTabLayout.getTabAt(i).setCustomView(customView);
}
pager.setCurrentItem(position_tab);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
myTabLayout.getTabAt(position_tab).getCustomView().setSelected(true);
}
private ViewPagerAdapter getViewPagerAdapter() {
ViewPagerAdapter mAdapter = new ViewPagerAdapter(getChildFragmentManager());
String title_arr[] = {"ADVISORY", "TOP ADVISORS", "EXPERT VIEW"};
for (int i = 0; i < title_arr.length; i++) {
Map<String, Object> map = new Hashtable<>();
map.put(ViewPagerAdapter.KEY_TITLE, title_arr[i]);
if (i == 0) {
map.put(ViewPagerAdapter.KEY_FRAGMENT, AdvisoryPagerFragment.newInstance());
} else if (i == 1) {
map.put(ViewPagerAdapter.KEY_FRAGMENT, TopAdvisoryPagerFragment.newInstance());
} else if (i == 2) {
map.put(ViewPagerAdapter.KEY_FRAGMENT, ExperViewPagerFragment.newInstance());
}
mAdapter.addFragmentAndTitle(map);
}
return mAdapter;
}
public static class ViewPagerAdapter extends FragmentStatePagerAdapter {
private static final String KEY_TITLE = "fragment_title";
private static final String KEY_FRAGMENT = "fragment";
boolean abc = false;
private int[] drawables = new int[]{R.drawable.advisory_selector, R.drawable.top_advisors_selector, R.drawable.expertview_selector};
private List<Map<String, Object>> maps = new ArrayList<>();
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
public View getCustomeView(Context context, int pos) {
View mView = LayoutInflater.from(context).inflate(R.layout.custom_tab_view, null);
TextView mTextView = (TextView) mView.findViewById(R.id.textView);
mTextView.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/ufonts.com_cambria.ttf"));
ImageView mImageView = (ImageView) mView.findViewById(R.id.imageView2);
mImageView.setTag(pos);
/*if(count >0)
{
Toast.makeText(context,"Count Is "+count,Toast.LENGTH_SHORT).show();
mImageView = (ImageView) mImageView.getTag(0);
mImageView.setSelected(false);
}
*/
mImageView.setImageResource(drawables[pos]);
mTextView.setText(getPageTitle(pos));
return mView;
}
public void addFragmentAndTitle(Map<String, Object> map) {
maps.add(map);
}
@Override
public CharSequence getPageTitle(int position) {
return (CharSequence) maps.get(position).get(KEY_TITLE);
}
@Override
public Fragment getItem(int position) {
return (Fragment) maps.get(position).get(KEY_FRAGMENT);
}
@Override
public int getCount() {
return maps.size();
}
}
}
MainTabFragment的子片段如下：
AdvisoryPagerFragment.java
public class AdvisoryPagerFragment extends Fragment {
static String advisory_child_fragments[];
int myID = 0;
Bundle bundle;
TabLayout mTabLayout;
public AdvisoryPagerFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @return A new instance of fragment AdvisoryPagerFragment.
*/
public static AdvisoryPagerFragment newInstance() {
return new AdvisoryPagerFragment();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View inflate = inflater.inflate(R.layout.fragment_app_pager, container, false);
/*Bundle args = getArguments();
if (args != null && args.containsKey("pos_end"))
myID = args.getInt("pos_end");*/
myID = MainTabFragment.position_child_tab;
mTabLayout = (TabLayout) inflate.findViewById(R.id.fragmentTabLayout);
advisory_child_fragments = new String[]{"EQUITY", "INDICES", "COMMODITY", "CURRENCY"};
ViewPager pager = (ViewPager) inflate.findViewById(R.id.fragment_pager);
FragmentViewPagerAdapter mPagerAdapter = new FragmentViewPagerAdapter(getChildFragmentManager());
pager.setAdapter(mPagerAdapter);
mTabLayout.setupWithViewPager(pager);
for (int i = 0; i < mPagerAdapter.getCount(); i++) {
View customView = mPagerAdapter.getCustomeView(getActivity(), i);
mTabLayout.getTabAt(i).setCustomView(customView);
}
pager.setCurrentItem(myID);
return inflate;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mTabLayout.getTabAt(myID).getCustomView().setSelected(true);
}
public static class FragmentViewPagerAdapter extends FragmentStatePagerAdapter {
public FragmentViewPagerAdapter(FragmentManager fm) {
super(fm);
}
public View getCustomeView(Context context, int pos) {
View mView = LayoutInflater.from(context).inflate(R.layout.custom_view, null);
TextView mTextView = (TextView) mView.findViewById(R.id.belowTab_textview);
mTextView.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/ufonts.com_cambria.ttf"));
mTextView.setText(getPageTitle(pos));
return mView;
}
//
@Override
public CharSequence getPageTitle(int position) {
return advisory_child_fragments[position];
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new EquityFragment();
case 1:
return new IndicesFragment();
case 2:
return new CommodityFragment();
case 3:
return new CurrencyFragment();
}
return null;
}
@Override
public int getCount() {
return 4;
}
}
}
并且上面的AdvisoryPagerFragment的子片段是
EquityFragment.java
public class EquityFragment extends android.support.v4.app.Fragment implements SearchView.OnQueryTextListener {
public static String imagepath = null;
static ArrayList<EquityDetails> catListDao = new ArrayList<EquityDetails>();
static ArrayList<EquityDetails> catListDao1 = new ArrayList<EquityDetails>();
static int count = 0;
static int count1 = 0;
ListView list;
View view;
Activity act;
AdvisorsAdapter adapter;
TextView empty_text;
private boolean isViewShown = false;
ProgressBar progressBar;
public static EquityFragment newInstance() {
return new EquityFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.equity_activity, container, false);
act = this.getActivity();
Log.d("Callled ", "" + count);
count++;
return view;
}
public void onActivityCreated(Bundle savedInstanceState1) {
super.onActivityCreated(savedInstanceState1);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
list = (ListView) view.findViewById(R.id.list_equity);
setHasOptionsMenu(true);
empty_text = (TextView) view.findViewById(R.id.empty);
progressBar = (ProgressBar) view.findViewById(R.id.progressBar);
if (Utils.isNetworkAvailable(getActivity())) {
if (catListDao.size() > 0) {
adapter = new AdvisorsAdapter(act, R.layout.custom_equity, catListDao, 5);
list.setAdapter(adapter);
} else {
new Thread(new Runnable() {
@Override
public void run() {
// do some work here
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
// if (!isViewShown) {
new FetchAllData(getActivity(), 5).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
// }
}
});
}
}).start();
}
} else {
CustomToast toast = new CustomToast(getActivity(), "There is no internet connection!");
}
}
FetchdataClass从服务中获取数据并添加到ListView中
public class FetchAllData extends AsyncTask<Void, Void, String> {
ProgressDialog pDialog;
int typeId;
private Context cont;
public FetchAllData(Context con, int typeId) {
// TODO Auto-generated constructor stub
this.cont = con;
this.typeId = typeId;
Log.d("Constructor Called", "yes");
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
progressBar.setVisibility(View.VISIBLE);
}
@Override
protected String doInBackground(Void... params) {
// TODO Auto-generated method stub
return getString();
}
private String getString() {
// TODO Auto-generated method stub
URL obj = null;
HttpURLConnection con = null;
try {
obj = new URL(Constants.AppBaseUrl + "/call_listing/" + typeId);
String userPassword = "oi" + ":" + "kl";
String header = "Basic " + new String(android.util.Base64.encode(userPassword.getBytes(), android.util.Base64.NO_WRAP));
con = (HttpURLConnection) obj.openConnection();
con.addRequestProperty("Authorization", header);
con.setRequestProperty("Content-type", "application/x-www-form-urlencoded");
con.setRequestMethod("POST");
// For POST only - BEGIN
con.setDoOutput(true);
OutputStream os = con.getOutputStream();
os.flush();
os.close();
// For POST only - END
int responseCode = con.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) { //success
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
Log.i("TAG", response.toString());
return response.toString();
} else {
Log.i("TAG", "POST request did not work.");
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (result != null) {
// pDialog.dismiss();
progressBar.setVisibility(View.GONE);
JSONObject jsonObject;
try {
catListDao = new ArrayList<EquityDetails>();
jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray("list");
Log.d("Length ", "" + jsonArray.length());
for (int i = 0; i < jsonArray.length(); i++) {
EquityDetails allDirectory = new EquityDetails();
allDirectory.setEntry_value(jsonArray.getJSONObject(i).getString("entry"));
allDirectory.setSerial_value(jsonArray.getJSONObject(i).getString("sl"));
allDirectory.setTg_value1(jsonArray.getJSONObject(i).getString("tgt_1"));
allDirectory.setTg_value2(jsonArray.getJSONObject(i).getString("tgt_2"));
allDirectory.setMainTitle_value(jsonArray.getJSONObject(i).getString("script"));
allDirectory.setMain_subTitle_value(jsonArray.getJSONObject(i).getString("exchange"));
allDirectory.setRating_value(jsonArray.getJSONObject(i).getString("rating"));
allDirectory.setReview_value(jsonArray.getJSONObject(i).getString("review"));
allDirectory.setImage1(jsonArray.getJSONObject(i).getString("advisor_image"));
allDirectory.setPosted_by(jsonArray.getJSONObject(i).getString("posted_by"));
allDirectory.setImage2(jsonArray.getJSONObject(i).getString("script_image"));
allDirectory.setCall_id(jsonArray.getJSONObject(i).getString("call_id"));
allDirectory.setBuy(jsonArray.getJSONObject(i).getString("buy_sentiment"));
allDirectory.setSell(jsonArray.getJSONObject(i).getString("sell_sentiment"));
allDirectory.setRecommend(jsonArray.getJSONObject(i).getString("recommendation"));
allDirectory.setPosted_date(jsonArray.getJSONObject(i).getString("posted_date"));
allDirectory.setExpiry_date(jsonArray.getJSONObject(i).getString("expiry_date"));
catListDao.add(allDirectory);
}
catListDao1 = catListDao;
ab = true;
adapter = new AdvisorsAdapter(act, R.layout.custom_equity, catListDao, 0);
list.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
//pDialog.dismiss();
progressBar.setVisibility(View.GONE);
}
}
解决方法:
试着设定
pager.setOffscreenPageLimit(no_of_fragments or pages);
在创建片段时执行asyctask中的所有任务
标签：android-tablayout,android,performance,android-fragments,android-viewpager 来源： https://codeday.me/bug/20191005/1854752.html