android - 在 Android 上为每个选项卡滑动更改操作栏标题

Question

我已经使用 ActionBarSherlock 和 Fragments 设置了带有滑动选项卡的操作栏。

我想为每个选项卡设置不同的操作栏标题。如果我可以设置图像而不是标题，那就太好了，这样每个选项卡都会有不同的操作栏图像标题。

如果有任何建议和教程链接，我将不胜感激!谢谢:)

这是我的代码:TabActivity.java

package com.tptabs;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;

import android.support.v4.view.ViewPager;

public class TabActivity extends SherlockFragmentActivity {

    private ViewPager mViewPager;
    private TabAdapter mTabsAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mViewPager = new ViewPager(this);
        mViewPager.setId(R.id.pager);
        setContentView(mViewPager);

        final ActionBar bar = getSupportActionBar();
        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        mTabsAdapter = new TabAdapter(this, mViewPager);
        mTabsAdapter.addTab(bar.newTab().setText("").setIcon(getResources().getDrawable(R.drawable.social_group)), JoinFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText("").setIcon(getResources().getDrawable(R.drawable.content_edit)), CreateFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText("").setIcon(getResources().getDrawable(R.drawable.location_web_site)), PlayFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText("").setIcon(getResources().getDrawable(R.drawable.collections_collection)), ResultFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText("").setIcon(getResources().getDrawable(R.drawable.device_access_accounts)), StoreFragment.class, null);
    }
}

TabAdapter.java

package com.tptabs;
import java.util.ArrayList;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.widget.Toast;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.actionbarsherlock.app.SherlockFragmentActivity;

public class TabAdapter extends FragmentPagerAdapter implements ActionBar.TabListener , ViewPager.OnPageChangeListener{
    private final Context mContext;
    private final ActionBar mActionBar;
    private final ViewPager mViewPager;
    private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
    private final String TAG = "21st Polling:";

    static final class TabInfo{
        private final Class<?> clss;
        private final Bundle args;

        TabInfo(Class<?> _class, Bundle _args){
            clss = _class;
            args = _args;
        }
    }

    public TabAdapter(SherlockFragmentActivity fa, ViewPager pager) {
        super(fa.getSupportFragmentManager());
        mContext = fa;
        mActionBar = fa.getSupportActionBar();
        mViewPager = pager;
        mViewPager.setAdapter(this);
        mViewPager.setOnPageChangeListener(this);
    }

    public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args){
        TabInfo info = new TabInfo(clss, args);
        tab.setTag(info);
        tab.setTabListener(this);
        mTabs.add(info);
        mActionBar.addTab(tab);
        notifyDataSetChanged();
    }

    @Override
    public void onPageScrollStateChanged(int state) {


    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {


    }

    @Override
    public void onPageSelected(int position) {
        mActionBar.setSelectedNavigationItem(position);
                }

    @Override
    public  void onTabSelected(Tab tab, FragmentTransaction ft) {
        mViewPager.setCurrentItem(tab.getPosition());
        Log.v(TAG, "clicked");
        Object tag = tab.getTag();
        for (int i = 0; i<mTabs.size(); i++){
            if (mTabs.get(i) == tag){
                mViewPager.setCurrentItem(i);
            }
        }

    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        //Toast.makeText(mContext, "You've deselected a tab", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {

    }

    @Override
    public Fragment getItem(int position) {
        TabInfo info = mTabs.get(position);
        return Fragment.instantiate(mContext, info.clss.getName(), info.args);
    }

    @Override
    public int getCount() {
        return mTabs.size();
    }

}

Answer 1

您需要像这样将 addOnPageChangeListener 设置为您的 View 寻呼机

 pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            if (position == 1) {
               setTitle("Page 1");
            } else if (position == 2)
            {
                setTitle("Page 2");
            }
            else
            {
                setTitle("Page 3");
            }


        }