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當我從一個標籤頁切換到另一個標籤頁時，我的應用程序非常滯後。一般而言，它只是一個遲緩。我不知道該怎麼做。這是我的代碼。我如何加快速度？我哪裏出錯了？在Tablayout中切換標籤頁時，應用程序會很慢
主要活動
package com.example.apple.project2;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
Context mContext;
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setBackgroundResource(Color.TRANSPARENT);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setOffscreenPageLimit(3);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem menu) {
if(menu.getItemId() == R.id.change_city){
showInputDialog();
}
return false;
}
private void showInputDialog(){
}
public void changeCity(String city){
mContext = this;
KeyValueDB.setCity(mContext, city);
String s=city;
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new ListContentFragment(), "Current");
adapter.addFragment(new DetailsFragment(),"Current Details");
adapter.addFragment(new CardContentFragment(), "10 Day Forecast");
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 addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
ListContentFragment.java
package com.example.apple.project2;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import butterknife.BindView;
import butterknife.ButterKnife;
public class ListContentFragment extends Fragment {
@BindView(R.id.city_field)
TextView cityText;
@BindView(R.id.temp_field)
TextView tempText;
@BindView(R.id.humity_field)
TextView humidText;
@BindView(R.id.speed_field)
TextView speedText;
Context mContext;
ViewGroup rootView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = (ViewGroup) inflater
.inflate(R.layout.item_list, container, false);
ButterKnife.bind(this, rootView);
mContext = getContext();
String t = KeyValueDB.getTemp(mContext);
double cel = Double.parseDouble(t);
tempText.setText(String.format("%.2f", cel)+"°C");
mContext = getContext();
String city = KeyValueDB.getCity(mContext);
city=city.toUpperCase();
mContext = getContext();
String country=KeyValueDB.getCountry(mContext);
country=country.toUpperCase();
cityText.setText(city+" , "+country);
mContext = getContext();
String humid=KeyValueDB.getHumidity(mContext);
mContext = getContext();
String speed=KeyValueDB.getSpeed(mContext);
humidText.setText(humid+"%");
speedText.setText(speed+" km/hr");
return rootView;
}
}
DetailsFragment.java
public class DetailsFragment extends Fragment {
public final String AppID = "ebfcac32bda131ed5a160f2757938396";
public final String BASE_URL = "http://api.openweathermap.org";
@BindView(R.id.latitudeTextView)
TextView latitudeTextView;
@BindView(R.id.longitudeTextView)
TextView longitudeTextView;
@BindView(R.id.countryTextView)
TextView countryTextView;
@BindView(R.id.descriptionTextView)
TextView descriptionTextView;
@BindView(R.id.tempTextView)
TextView tempTextView;
@BindView(R.id.humidityTextView)
TextView humidityTextView;
@BindView(R.id.tempMinTextView)
TextView tempMinTextView;
@BindView(R.id.tempMaxTextView)
TextView tempMaxTextView;
@BindView(R.id.speedTextView)
TextView speedTextView;
@BindView(R.id.nameTextView)
TextView nameTextView;
private ProgressDialog mProgressDialog;
private ViewPager mCategoriesViewPager;
private TabLayout tabLayout;
private View mViewHome;
String CITY;
View view;
Context mContext;
ViewGroup rootView;
public DetailsFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = (ViewGroup) inflater
.inflate(R.layout.item_detail, container, false);
mProgressDialog = new ProgressDialog(getActivity());
mProgressDialog.setMessage(getString(R.string.fetching_weather_info));
mProgressDialog.setCancelable(false);
weatherUpdate();
FloatingActionButton fab = (FloatingActionButton) rootView.findViewById(R.id.fab);
fab.setImageDrawable(ContextCompat.getDrawable(getActivity(), R.drawable.cityicon));
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Change city");
final EditText input = new EditText(getActivity());
input.setInputType(InputType.TYPE_CLASS_TEXT);
builder.setView(input);
builder.setPositiveButton("Go", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
changeCity(input.getText().toString());
}
});
builder.show();
}
});
return rootView;
}
public void weatherUpdate(){
ButterKnife.bind(this, rootView);
Context mContext;
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
mContext = getContext();
String city = KeyValueDB.getCity(mContext);
CITY=city;
Retrofit retrofit = new Retrofit
.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
WeatherService weatherService = retrofit.create(WeatherService.class);
Call<WeatherInfo> weatherInfoCall = weatherService.getWeatherInfo(CITY, AppID);
weatherInfoCall.enqueue(new Callback<WeatherInfo>() {
@Override
public void onResponse(Call<WeatherInfo> call, Response<WeatherInfo> response) {
showProgressDialog(false);
onDisplayWeatherInfo(response.body());
showProgressDialog(false); }
@Override
public void onFailure(Call<WeatherInfo> call, Throwable t) {
showProgressDialog(false);
Toast.makeText(getActivity(), R.string.fetching_weather_info_failure, Toast.LENGTH_SHORT).show();
}
});
}
private void showProgressDialog(boolean show) {
if (show) {
if (!mProgressDialog.isShowing()) {
mProgressDialog.show();
}
} else {
if (mProgressDialog.isShowing()) {
mProgressDialog.dismiss();
}
}
}
public void changeCity(String city){
mContext = getActivity();
KeyValueDB.setCity(mContext, city);
CITY=city;
weatherUpdate();
}
double f,c;
String humid,temp,speed,countryname,cityname;
private void onDisplayWeatherInfo(WeatherInfo weatherInfo) {
if (weatherInfo != null) {
latitudeTextView.setText(String.valueOf(weatherInfo.coord.lat));
latitudeTextView.setText(String.valueOf(weatherInfo.coord.lat));
longitudeTextView.setText(String.valueOf(weatherInfo.coord.lon));
countryTextView.setText(String.valueOf(weatherInfo.sys.country));
descriptionTextView.setText(String.valueOf(weatherInfo.weather[0].description));
tempTextView.setText(String.valueOf(weatherInfo.main.temp));
temp=String.valueOf(weatherInfo.main.temp);
humidityTextView.setText(String.valueOf(weatherInfo.main.humidity));
humid=String.valueOf(weatherInfo.main.humidity);
tempMinTextView.setText(String.valueOf(weatherInfo.main.temp_min));
tempMaxTextView.setText(String.valueOf(weatherInfo.main.temp_max));
cityname=(String.valueOf(weatherInfo.name));
countryname=(String.valueOf(weatherInfo.sys.country));
speedTextView.setText(String.valueOf(weatherInfo.wind.speed));
speed=String.valueOf(weatherInfo.wind.speed);
nameTextView.setText(String.valueOf(weatherInfo.name));
updateUI();
}
}
public void updateUI()
{
f=Double.parseDouble(temp);
c= (f-273.15);
temp = String.valueOf(c);
mContext=getActivity();
KeyValueDB.setTemp(mContext, temp);
mContext=getActivity();
KeyValueDB.setHumidity(mContext, humid);
mContext=getActivity();
KeyValueDB.setCity(mContext, cityname);
mContext=getActivity();
KeyValueDB.setCountry(mContext, countryname);
mContext=getActivity();
KeyValueDB.setSpeed(mContext, speed);
}
}
這可能更適合http://codereview.stackexchange.com/ – brennan