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我想讓我的viewPager支持Rtl，並在最後一個片段上設置當前項目，但是當我在MainActivity.java中編寫此代碼時，我不知道如何才能訪問最後一個片段分段。如何在MainActivity中查找最後一個片段
iViewPager.setCurrentItem();
這是我MainActivity.java，我定義viewPager
package com.example.imajid.grid2.activities;
import android.support.design.widget.NavigationView;
import android.support.design.widget.TabLayout;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import com.example.imajid.grid2.R;
import com.example.imajid.grid2.adapters.PagerAdapter;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//----------------------- set toolbar
Toolbar iToolbar = (Toolbar) findViewById(R.id.xmlToolbar);
setSupportActionBar(iToolbar);
//------------------------------ initialize toolbar
ActionBar actionBar = getSupportActionBar();
actionBar.setHomeAsUpIndicator(R.drawable.menu);
actionBar.setDisplayHomeAsUpEnabled(true);
//**************************** find tablayout *****************************//
TabLayout iTabLayout = (TabLayout) findViewById(R.id.xmlTabLayout);
iTabLayout.addTab(iTabLayout.newTab());
iTabLayout.addTab(iTabLayout.newTab());
iTabLayout.addTab(iTabLayout.newTab());
iTabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
//******************************* Array list for sending titles *********************************//
ArrayList<String> viewPagersTitle = new ArrayList<String>();
viewPagersTitle.add("صفحه اصلی");
viewPagersTitle.add("فیلم");
viewPagersTitle.add("آهنگ");
//******************************* find view pager in xml *****************************//
ViewPager iViewPager = (ViewPager) findViewById(R.id.xmlViewPager);
//************************************** Rtlizer view pager ************************************
====>iViewPager.setCurrentItem();
//************************************** find adapter for view pager *******************************//
PagerAdapter viewPagerAdapter = new PagerAdapter(getSupportFragmentManager() , iTabLayout.getTabCount() , viewPagersTitle);
//************************************ set adapter for view pager *******************************//
iViewPager.setAdapter(viewPagerAdapter);
//*********************************** setup tablayout to view pager********************************//
iTabLayout.setupWithViewPager(iViewPager);
mDrawerLayout = (DrawerLayout) findViewById(R.id.xmlDrawerLayoutRoot);
//-------------------------------------- find navigation view
NavigationView navigationView = (NavigationView)findViewById(R.id.xmlNavigation);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
mDrawerLayout.closeDrawers();
Toast.makeText(MainActivity.this , menuItem.getTitle() , Toast.LENGTH_SHORT).show();
return true;
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return true;
}
//onoptionItemSelected
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int itemId = item.getItemId();
String btnName = null;
switch (itemId){
case android.R.id.home:
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
case R.id.menu_setting:
btnName = "Setting";
break;
case R.id.menu_compass:
btnName = "Compass";
break;
case R.id.menu_help:
btnName = "Help";
break;
}
Toast.makeText(MainActivity.this , "You clicked at " + btnName , Toast.LENGTH_SHORT).show();
return true;
}
}
，這是我的看法尋呼機適配器
package com.example.imajid.grid2.adapters;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import com.example.imajid.grid2.fragments.TabFragment1;
import com.example.imajid.grid2.fragments.TabFragment2;
import com.example.imajid.grid2.fragments.TabFragment3;
import java.util.ArrayList;
/**
* Created by imajid on 12/8/2015.
*/
public class PagerAdapter extends FragmentStatePagerAdapter {
private ArrayList<String> titles;
int numOfTabs;
public PagerAdapter(FragmentManager fm , int numOfTabs , ArrayList<String> titles) {
super(fm);
this.numOfTabs =numOfTabs;
this.titles = titles;
}
@Override
public Fragment getItem(int position) {
switch (position){
case 0:
TabFragment1 tab1 = new TabFragment1();
return tab1;
case 1:
TabFragment2 tab2 = new TabFragment2();
return tab2;
case 2:
TabFragment3 tab3 = new TabFragment3();
return tab3;
default:
return null;
}
}
@Override
public int getCount() {
return this.numOfTabs;
}
@Override
public CharSequence getPageTitle(int position) {
return titles.get(position);
}
}
感謝您的回答但你的爽快是行不通的，請參閱此主題http://stackoverflow.com/questions/13489723/how-to-reverse-the-direction-of-viewpager-to-left-to-right-order –