我使用標籤創建了一個刷卡視圖。同時加載所有分支的標籤刷卡視圖
問題是,當活動創建時,三個片段同時加載。當活動打開時,我設置默認片段開始,所以其他片段沒有從服務器下載數據,但不會有人刷到這個片段。
這是我的活動,我不會從三個片段中放置代碼,因爲我認爲與解決方案無關,但是如果有必要讓我知道。
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
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.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import java.util.ArrayList;
import java.util.List;
public class Information extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
String id;
String idUser;
Complejo complejo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_icon_text_tabs);
recogerParametro();
setTitle(complejo.getName());
viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setOffscreenPageLimit(2);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_informacion_complejo, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.btn_llamarBarra:
try {
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:" + complejo.getTelefono().toString()));
startActivity(callIntent);
} catch (ActivityNotFoundException activityException) {
Log.e("Llamando..", "Falló la llamada", activityException);
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new GaleriaComplejoFragment(), "GALERÍA");
adapter.addFrag(new InformacionComplejoFragment(), "INFORMACIÓN");
adapter.addFrag(new ComentariosComplejoFragment(), "COMENTARIOS");
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(1, false);
}
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);
}
}
private void recogerParametro() {
id= getIntent().getStringExtra("id");
idUser = getIntent().getStringExtra("idUser");
complejo = (Complejo) getIntent().getSerializableExtra("complejo");
}
}
感謝您的幫助!
ViewPager功能:它加載在同一時間3片段,第一次默認的,第二:左片段默認的,第三:正確的片段到默認的一個 –
我知道,但我怎樣才能改變代碼? –
將代碼放入onresume中,條件是如果數據未加載,則只加載新數據,否則顯示已加載的數據。因爲onresume被多次調用。 – androidnoobdev