android - TabListener、ActionBarSherlock Fragment 和 ListFragment、PageAdapter 的混合？一团糟

Question

我有一个包含 2 个 fragment 的 Activity 。我决定使用 PageAdapter 在两个 View 之间滑动，但是，为了接近 android 设计最佳实践，我还决定使用操作栏选项卡(固定选项卡)。我正在使用 ActionBarSherlock 和 here 中的一些代码实现选项卡。仅使用 pageadapter，该 Activity 运行良好，现在我遇到了两个问题:1) 第一个 fragment (MatchRugbyButtonFragment) 给自己的图像留下了深刻的印象，所以如果我触摸它并移动或改变某些东西，我会看到工作 fragment 上方的图像。2)当我转到第二个 fragment 时，第一个 fragment 丢失所有变量(定时器重置、计数器重置、ecc)。我必须创建 tablistener，因为一个 fragment 是 SherlockFragment，另一个 fragment 是 SherlockListFragment，这会导致无法将 fragment 转换为 SherlockListFragment 的错误。这是 Activity :

  import java.util.ArrayList;
  import java.util.Arrays;
   import java.util.List;
    import java.util.Vector;

    import android.content.Intent;
    import android.os.Bundle;
     import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
     import android.support.v4.app.FragmentTransaction;
    import android.support.v4.app.ListFragment;
    import android.support.v4.view.ViewPager;
    import android.view.View;
    import android.widget.ArrayAdapter;
    import android.widget.Toast;

      import com.actionbarsherlock.app.ActionBar;
    import com.actionbarsherlock.app.ActionBar.Tab;
    import com.actionbarsherlock.app.SherlockFragment;
    import com.actionbarsherlock.app.SherlockFragmentActivity;
    import com.actionbarsherlock.view.Menu;
    import com.actionbarsherlock.view.MenuInflater;
    import com.actionbarsherlock.view.MenuItem;


    public class MatchRugbyFragments extends SherlockFragmentActivity implements View.OnClickListener, View.OnLongClickListener{


public static ArrayList<String> commentary;

public static ArrayAdapter<String> adapter;



// list contains fragments to instantiate in the viewpager
static List<Fragment> fragments = new Vector<Fragment>();
// page adapter between fragment list and view pager
private MyPagerAdapter mPagerAdapter;
// view pager
private ViewPager mPager;




protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);     
    setContentView(R.layout.fragments_rugby);

    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

    MatchRugbyButtonFragment buttonFrag = new MatchRugbyButtonFragment();
    MatchRugbySummaryFragment listFrag = new MatchRugbySummaryFragment();
    fragmentTransaction.add(R.id.pager, buttonFrag);
    fragmentTransaction.add(R.id.pager, listFrag);
    fragmentTransaction.commit();


    // creating fragments and adding to list
    fragments.add(buttonFrag);
    fragments.add(listFrag);


    // creating adapter and linking to view pager
    this.mPagerAdapter = new MyPagerAdapter(super.getSupportFragmentManager(),fragments);
    mPager = (ViewPager) super.findViewById(R.id.pager);
    mPager.setAdapter(this.mPagerAdapter);


    String[] array = {""}; 
    commentary = new ArrayList<String>();
    commentary.addAll(Arrays.asList(array));

    adapter = new ArrayAdapter<String>(this,
            R.layout.list_item_commentary,  commentary);





    final ActionBar bar = getSupportActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
    bar.setHomeButtonEnabled(true);

    bar.addTab(bar.newTab()
            .setText("Comandi")
            .setTabListener(new TabListener<MatchRugbyButtonFragment>(
                    this, "comandi", MatchRugbyButtonFragment.class)));
    bar.addTab(bar.newTab()
            .setText("Riassunto")
            .setTabListener(new TabListenerList<MatchRugbySummaryFragment>(
                    this, "riassunto", MatchRugbySummaryFragment.class)));


    if (savedInstanceState != null) {
        bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
    }
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
}

//Comandi per il click prolungato
public boolean onLongClick(View view) {

    return false;
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getSupportMenuInflater();
    inflater.inflate(R.menu.rugby_match_menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
        // app icon in action bar clicked; go home
        Intent intent = new Intent(this, SportScoutActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}
public static void addCommentaryRow(String s){
    adapter.add(s);
    MatchRugbySummaryFragment f2 = (MatchRugbySummaryFragment) fragments.get(1);
    f2.setListAdapter(adapter);
}

public static String commentaryToString(){
    String sAdapter= adapter.toString();
    return sAdapter;
}

public void onClick(View arg0) {


}



/**
 * @return the commentary
 */
public  ArrayList<String> getCommentary() {
    return commentary;
}



/**
 * @param commentary the commentary to set
 */
public void setCommentary(ArrayList<String> commentary) {
    MatchRugbyFragments.commentary = commentary;
}



/**
 * @return the adapter
 */
public ArrayAdapter<String> getAdapter() {
    return adapter;
}



/**
 * @param adapter the adapter to set
 */
public void setAdapter(ArrayAdapter<String> adapter) {
    MatchRugbyFragments.adapter = adapter;
}

// page 1 fragment listener implementation
public void onPage1(String s) {    



    // page 2 fragment update


}

public static class TabListener<T> implements ActionBar.TabListener {
    private final SherlockFragmentActivity mActivity;
    private final String mTag;
    private final Class<T> mClass;
    private final Bundle mArgs;
    private android.support.v4.app.Fragment mFragment;

    public TabListener(SherlockFragmentActivity activity, String tag, Class<T> clz) {
        this(activity, tag, clz, null);
    }

    public TabListener(SherlockFragmentActivity activity, String tag, Class<T> clz, Bundle args) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
        mArgs = args;

        // Check to see if we already have a fragment for this tab, probably
        // from a previously saved state.  If so, deactivate it, because our
        // initial state is that a tab isn't shown.
        mFragment = mActivity.getSupportFragmentManager().findFragmentByTag(mTag);
        if (mFragment != null && !mFragment.isDetached()) {
            FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
            ft.detach(mFragment);
            ft.commit();
        }
    }

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        if (mFragment == null) {
            mFragment = (SherlockFragment) Fragment.instantiate(mActivity, mClass.getName(), mArgs);
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            ft.attach(mFragment);
        }
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        if (mFragment != null) {
            ft.detach(mFragment);
        }
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        Toast.makeText(mActivity, "Reselected!", Toast.LENGTH_SHORT).show();
    }


}

public static class TabListenerList<T> implements ActionBar.TabListener {
    private final SherlockFragmentActivity mActivity;
    private final String mTag;
    private final Class<T> mClass;
    private final Bundle mArgs;
    private android.support.v4.app.ListFragment mFragment;

    public TabListenerList(SherlockFragmentActivity activity, String tag, Class<T> clz) {
        this(activity, tag, clz, null);
    }

    public TabListenerList(SherlockFragmentActivity activity, String tag, Class<T> clz, Bundle args) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
        mArgs = args;

        // Check to see if we already have a fragment for this tab, probably
        // from a previously saved state.  If so, deactivate it, because our
        // initial state is that a tab isn't shown.
        mFragment = (ListFragment) mActivity.getSupportFragmentManager().findFragmentByTag(mTag);
        if (mFragment != null && !mFragment.isDetached()) {
            FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
            ft.detach(mFragment);
            ft.commit();
        }
    }

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        if (mFragment == null) {
            mFragment = (ListFragment) Fragment.instantiate(mActivity, mClass.getName(), mArgs);
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            ft.attach(mFragment);
        }
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        if (mFragment != null) {
            ft.detach(mFragment);
        }
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        Toast.makeText(mActivity, "Reselected!", Toast.LENGTH_SHORT).show();
    }


}
    }

这是页面适配器类:

    package com.gmail.david.corsalini.sportscout;

    import java.util.List;

     import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentPagerAdapter;

    public class MyPagerAdapter extends FragmentPagerAdapter {

    // fragments to instantiate in the viewpager
    private List<Fragment> fragments;

    // constructor
    public MyPagerAdapter(FragmentManager fm,List<Fragment> fragments) {
        super(fm);
        this.fragments = fragments;
    }

    // return access to fragment from position, required override
    @Override
    public Fragment getItem(int position) {
        return this.fragments.get(position);
    }

    // number of fragments in list, required override
    @Override
    public int getCount() {
        return this.fragments.size();
    }

}

Answer 1

!!!问题解决了!!!

我不知道这是否是 SO 上的最佳实践，但我已经解决了我的问题，感谢这个 page我想分享它来帮助有需要的人。那里的操作栏是“原始的”，所以我不得不对其进行一些定制以适应 ABS。这是最后一个类，它处理选项卡和滑动的各个方面(包括自动将选项卡放在操作栏的内部或外部):

   import java.util.ArrayList;
   import java.util.Arrays;
   import android.content.Context;
   import android.content.Intent;
   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.view.View;
   import android.widget.ArrayAdapter;
   import com.actionbarsherlock.app.ActionBar;
   import com.actionbarsherlock.app.ActionBar.Tab;
   import com.actionbarsherlock.app.SherlockFragmentActivity;
   import com.actionbarsherlock.view.Menu;
   import com.actionbarsherlock.view.MenuInflater;
   import com.actionbarsherlock.view.MenuItem;



   public class MatchRugbyFragments extends SherlockFragmentActivity implements View.OnClickListener, View.OnLongClickListener{


public static ArrayList<String> commentary;

public static ArrayAdapter<String> adapter;

private ViewPager mViewPager;
private TabsAdapter mTabsAdapter;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);     
    setContentView(R.layout.fragments_rugby);


    String[] array = {}; 
    commentary = new ArrayList<String>();
    commentary.addAll(Arrays.asList(array));

    adapter = new ArrayAdapter<String>(this,
            R.layout.list_item_commentary,  commentary);



    mViewPager = new ViewPager(this);
    mViewPager.setId(R.id.pager);
    setContentView(mViewPager);
    final ActionBar bar =  getSupportActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
    bar.setHomeButtonEnabled(true);


    mTabsAdapter = new TabsAdapter(this, mViewPager);
    mTabsAdapter.addTab(bar.newTab().setText(""+"Comandi"),
            MatchRugbyButtonFragment.class, null);
    mTabsAdapter.addTab(bar.newTab().setText(""+"Riassunto"),
            MatchRugbySummaryFragment.class, null);


}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
}

//Comandi per il click prolungato
public boolean onLongClick(View view) {

    return false;
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getSupportMenuInflater();
    inflater.inflate(R.menu.rugby_match_menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
        // app icon in action bar clicked; go home
        Intent intent = new Intent(this, SportScoutActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}
public static void addCommentaryRow(String s){
    adapter.add(s);

}

public static String commentaryToString(){
    String sAdapter= adapter.toString();
    return sAdapter;
}

public void onClick(View arg0) {


}



/**
 * @return the commentary
 */
public  ArrayList<String> getCommentary() {
    return commentary;
}



/**
 * @param commentary the commentary to set
 */
public void setCommentary(ArrayList<String> commentary) {
    MatchRugbyFragments.commentary = commentary;
}



/**
 * @return the adapter
 */
public ArrayAdapter<String> getAdapter() {
    return adapter;
}



/**
 * @param adapter the adapter to set
 */
public void setAdapter(ArrayAdapter<String> adapter) {
    MatchRugbyFragments.adapter = adapter;
}





public static class TabsAdapter 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>();

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

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

    public TabsAdapter(SherlockFragmentActivity activity, ViewPager pager) {
        super(activity.getSupportFragmentManager());
        mContext = activity;
        mActionBar = activity.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();
    }


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

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


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


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


    public void onPageScrollStateChanged(int state) {
    }


    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);
            }
        }
    }




    public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) {}

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {


    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {


    }


}
   }