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Android 如何从片段更新片段寻呼机适配器？

android android-fragments

Android 如何从片段更新片段寻呼机适配器？,android,android-fragments,android-viewpager,fragmentpageradapter,Android,Android Fragments,Android Viewpager,Fragmentpageradapter,问题：： private void loadFragments() { try { dataHelper=new DataHelper(this); menuInfo=dataHelper.getTransMenuInfo(); servicesName = new ArrayList<String>(); servicesImage = new ArrayList<Integer>();

问题：：

private void loadFragments()
{
    try
    {
        dataHelper=new DataHelper(this);
        menuInfo=dataHelper.getTransMenuInfo();

        servicesName = new ArrayList<String>();
        servicesImage = new ArrayList<Integer>();

        if(menuInfo.contains("1"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("1"));
            servicesImage.add(R.drawable.icon);
        }
        if(menuInfo.contains("2"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("2"));
            servicesImage.add(R.drawable.icon);
        }
        if(menuInfo.contains("4"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("4"));
            servicesImage.add(R.drawable.icon);
        }

        dataHelper.close();
        servicesName.add("Fragment 4");
        servicesImage.add(R.drawable.wallet);

        servicesName.add("Fragment 5");
        servicesImage.add(R.drawable.reports);

        servicesName.add("Fragment 6");
        servicesImage.add(R.drawable.setting);

        List<Fragment> fragments = getFragments();

        if(fragments!=null && fragments.size()>0)
        {
            actionbartabmenuAdapter = new ActionBarTabMenuAdapter(getSupportFragmentManager(), fragments,this,servicesName,servicesImage);
            awesomePager.setAdapter(actionbartabmenuAdapter);
        }
    }
    catch(SQLiteException e)
    {
        e.printStackTrace();
    }
    catch(NullPointerException e)
    {
        e.printStackTrace();
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}

java.lang.IllegalStateException: Must be called from main thread of process
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1392)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:139)
at android.support.v4.view.ViewPager.setAdapter(ViewPager.java:321)
at com.example.testapp.TestActivity.loadFragments(TestActivity.java:238)
com.example.testapp.TestActivity.access$0(TestActivity.java:193)
at v.ButtonPayActivity$1.loadTransactionMenu(TestActivity.java:596)
at com.example.testapp.home.SettingsListFragment$4.run(SettingsListFragment.java:769)
at java.lang.Thread.run(Thread.java:1019)

private class ActionBarTabMenuAdapter extends FragmentStatePagerAdapter  
{
    Activity context;
    Context ctx;
    ArrayList<String> menuInfo;
    private List<Fragment> fragments;
    ArrayList<String> services;
    ArrayList<Integer> images;

    public ActionBarTabMenuAdapter(FragmentManager fm, List<Fragment> fragments,Context ctx,ArrayList<String> servicesName,ArrayList<Integer> servicesImage)
    {
        super(fm);
        this.context=(Activity) ctx;
        dataHelper=new DataHelper(ctx);
        menuInfo=dataHelper.getTransMenuInfo();
        dataHelper.close();

        this.services = servicesName;
        this.images = servicesImage;
        this.fragments = fragments;
        menuInfo.add("Wallet To Wallet");
        menuInfo.add("Reports");
        menuInfo.add("Settings");
    }

    @Override
    public int getCount() 
    {
        return fragments.size();
    }
     public int getItemPosition(Object item) {
        //Fragment fragment = (Fragment)item;
        return POSITION_NONE;
    }

    @Override
    public Fragment getItem(int position) 
    {
        return this.fragments.get(position);
    }
}

class ViewHolder {
    TextView Title, Description, ReadMore;
}
我有一个SherlockFragmentActivity，其中我添加了六个片段。 现在，在6个碎片中，有3个是根据条件添加的

加载片段：：

private void loadFragments()
{
    try
    {
        dataHelper=new DataHelper(this);
        menuInfo=dataHelper.getTransMenuInfo();

        servicesName = new ArrayList<String>();
        servicesImage = new ArrayList<Integer>();

        if(menuInfo.contains("1"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("1"));
            servicesImage.add(R.drawable.icon);
        }
        if(menuInfo.contains("2"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("2"));
            servicesImage.add(R.drawable.icon);
        }
        if(menuInfo.contains("4"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("4"));
            servicesImage.add(R.drawable.icon);
        }

        dataHelper.close();
        servicesName.add("Fragment 4");
        servicesImage.add(R.drawable.wallet);

        servicesName.add("Fragment 5");
        servicesImage.add(R.drawable.reports);

        servicesName.add("Fragment 6");
        servicesImage.add(R.drawable.setting);

        List<Fragment> fragments = getFragments();

        if(fragments!=null && fragments.size()>0)
        {
            actionbartabmenuAdapter = new ActionBarTabMenuAdapter(getSupportFragmentManager(), fragments,this,servicesName,servicesImage);
            awesomePager.setAdapter(actionbartabmenuAdapter);
        }
    }
    catch(SQLiteException e)
    {
        e.printStackTrace();
    }
    catch(NullPointerException e)
    {
        e.printStackTrace();
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}

java.lang.IllegalStateException: Must be called from main thread of process
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1392)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:139)
at android.support.v4.view.ViewPager.setAdapter(ViewPager.java:321)
at com.example.testapp.TestActivity.loadFragments(TestActivity.java:238)
com.example.testapp.TestActivity.access$0(TestActivity.java:193)
at v.ButtonPayActivity$1.loadTransactionMenu(TestActivity.java:596)
at com.example.testapp.home.SettingsListFragment$4.run(SettingsListFragment.java:769)
at java.lang.Thread.run(Thread.java:1019)

private class ActionBarTabMenuAdapter extends FragmentStatePagerAdapter  
{
    Activity context;
    Context ctx;
    ArrayList<String> menuInfo;
    private List<Fragment> fragments;
    ArrayList<String> services;
    ArrayList<Integer> images;

    public ActionBarTabMenuAdapter(FragmentManager fm, List<Fragment> fragments,Context ctx,ArrayList<String> servicesName,ArrayList<Integer> servicesImage)
    {
        super(fm);
        this.context=(Activity) ctx;
        dataHelper=new DataHelper(ctx);
        menuInfo=dataHelper.getTransMenuInfo();
        dataHelper.close();

        this.services = servicesName;
        this.images = servicesImage;
        this.fragments = fragments;
        menuInfo.add("Wallet To Wallet");
        menuInfo.add("Reports");
        menuInfo.add("Settings");
    }

    @Override
    public int getCount() 
    {
        return fragments.size();
    }
     public int getItemPosition(Object item) {
        //Fragment fragment = (Fragment)item;
        return POSITION_NONE;
    }

    @Override
    public Fragment getItem(int position) 
    {
        return this.fragments.get(position);
    }
}

class ViewHolder {
    TextView Title, Description, ReadMore;
}
现在在片段6中，我已经从TestActivity（我正在设置适配器的地方）传递了接口对象

现在，在片段6的新InstanceMethod中，我获得了对象并调用
loadMenu（）
方法

但是现在在应用这个机制之后，我得到了以下例外

错误：：

private void loadFragments()
{
    try
    {
        dataHelper=new DataHelper(this);
        menuInfo=dataHelper.getTransMenuInfo();

        servicesName = new ArrayList<String>();
        servicesImage = new ArrayList<Integer>();

        if(menuInfo.contains("1"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("1"));
            servicesImage.add(R.drawable.icon);
        }
        if(menuInfo.contains("2"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("2"));
            servicesImage.add(R.drawable.icon);
        }
        if(menuInfo.contains("4"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("4"));
            servicesImage.add(R.drawable.icon);
        }

        dataHelper.close();
        servicesName.add("Fragment 4");
        servicesImage.add(R.drawable.wallet);

        servicesName.add("Fragment 5");
        servicesImage.add(R.drawable.reports);

        servicesName.add("Fragment 6");
        servicesImage.add(R.drawable.setting);

        List<Fragment> fragments = getFragments();

        if(fragments!=null && fragments.size()>0)
        {
            actionbartabmenuAdapter = new ActionBarTabMenuAdapter(getSupportFragmentManager(), fragments,this,servicesName,servicesImage);
            awesomePager.setAdapter(actionbartabmenuAdapter);
        }
    }
    catch(SQLiteException e)
    {
        e.printStackTrace();
    }
    catch(NullPointerException e)
    {
        e.printStackTrace();
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}

java.lang.IllegalStateException: Must be called from main thread of process
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1392)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:139)
at android.support.v4.view.ViewPager.setAdapter(ViewPager.java:321)
at com.example.testapp.TestActivity.loadFragments(TestActivity.java:238)
com.example.testapp.TestActivity.access$0(TestActivity.java:193)
at v.ButtonPayActivity$1.loadTransactionMenu(TestActivity.java:596)
at com.example.testapp.home.SettingsListFragment$4.run(SettingsListFragment.java:769)
at java.lang.Thread.run(Thread.java:1019)

private class ActionBarTabMenuAdapter extends FragmentStatePagerAdapter  
{
    Activity context;
    Context ctx;
    ArrayList<String> menuInfo;
    private List<Fragment> fragments;
    ArrayList<String> services;
    ArrayList<Integer> images;

    public ActionBarTabMenuAdapter(FragmentManager fm, List<Fragment> fragments,Context ctx,ArrayList<String> servicesName,ArrayList<Integer> servicesImage)
    {
        super(fm);
        this.context=(Activity) ctx;
        dataHelper=new DataHelper(ctx);
        menuInfo=dataHelper.getTransMenuInfo();
        dataHelper.close();

        this.services = servicesName;
        this.images = servicesImage;
        this.fragments = fragments;
        menuInfo.add("Wallet To Wallet");
        menuInfo.add("Reports");
        menuInfo.add("Settings");
    }

    @Override
    public int getCount() 
    {
        return fragments.size();
    }
     public int getItemPosition(Object item) {
        //Fragment fragment = (Fragment)item;
        return POSITION_NONE;
    }

    @Override
    public Fragment getItem(int position) 
    {
        return this.fragments.get(position);
    }
}

class ViewHolder {
    TextView Title, Description, ReadMore;
}
编辑：：

private class ActionBarTabMenuAdapter extends FragmentPagerAdapter  
{
    Activity context;
    Context ctx;
    ArrayList<String> menuInfo;
    private List<Fragment> fragments;
    ArrayList<String> services;
    ArrayList<Integer> images;

    public ActionBarTabMenuAdapter(FragmentManager fm, List<Fragment> fragments,Context ctx,ArrayList<String> servicesName,ArrayList<Integer> servicesImage)
    {
        super(fm);
        this.context=(Activity) ctx;
        dataHelper=new DataHelper(ctx);
        menuInfo=dataHelper.getTransMenuInfo();
        dataHelper.close();

        this.services = servicesName;
        this.images = servicesImage;
        this.fragments = fragments;
        menuInfo.add("Wallet To Wallet");
        menuInfo.add("Reports");
        menuInfo.add("Settings");
    }

    @Override
    public int getCount() 
    {
        return fragments.size();
    }
    @Override
    public Fragment getItem(int position) 
    {
        return this.fragments.get(position);
    }
}

class ViewHolder {
    TextView Title, Description, ReadMore;
}

MenuInterface mMenuInterface=new MenuInterface() {
        @Override
        public void loadTransactionMenu() {
            runOnUiThread(new Runnable() {
                public void run() {
                    loadFragments();
                    if(actionbartabmenuAdapter!=null){
                        actionbartabmenuAdapter.notifyDataSetChanged();
                    }
                }
            });
        }
    };
适配器：：

private void loadFragments()
{
    try
    {
        dataHelper=new DataHelper(this);
        menuInfo=dataHelper.getTransMenuInfo();

        servicesName = new ArrayList<String>();
        servicesImage = new ArrayList<Integer>();

        if(menuInfo.contains("1"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("1"));
            servicesImage.add(R.drawable.icon);
        }
        if(menuInfo.contains("2"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("2"));
            servicesImage.add(R.drawable.icon);
        }
        if(menuInfo.contains("4"))
        {
            servicesName.add(dataHelper.getTransMenu_ModuleName("4"));
            servicesImage.add(R.drawable.icon);
        }

        dataHelper.close();
        servicesName.add("Fragment 4");
        servicesImage.add(R.drawable.wallet);

        servicesName.add("Fragment 5");
        servicesImage.add(R.drawable.reports);

        servicesName.add("Fragment 6");
        servicesImage.add(R.drawable.setting);

        List<Fragment> fragments = getFragments();

        if(fragments!=null && fragments.size()>0)
        {
            actionbartabmenuAdapter = new ActionBarTabMenuAdapter(getSupportFragmentManager(), fragments,this,servicesName,servicesImage);
            awesomePager.setAdapter(actionbartabmenuAdapter);
        }
    }
    catch(SQLiteException e)
    {
        e.printStackTrace();
    }
    catch(NullPointerException e)
    {
        e.printStackTrace();
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}

java.lang.IllegalStateException: Must be called from main thread of process
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1392)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:139)
at android.support.v4.view.ViewPager.setAdapter(ViewPager.java:321)
at com.example.testapp.TestActivity.loadFragments(TestActivity.java:238)
com.example.testapp.TestActivity.access$0(TestActivity.java:193)
at v.ButtonPayActivity$1.loadTransactionMenu(TestActivity.java:596)
at com.example.testapp.home.SettingsListFragment$4.run(SettingsListFragment.java:769)
at java.lang.Thread.run(Thread.java:1019)

private class ActionBarTabMenuAdapter extends FragmentStatePagerAdapter  
{
    Activity context;
    Context ctx;
    ArrayList<String> menuInfo;
    private List<Fragment> fragments;
    ArrayList<String> services;
    ArrayList<Integer> images;

    public ActionBarTabMenuAdapter(FragmentManager fm, List<Fragment> fragments,Context ctx,ArrayList<String> servicesName,ArrayList<Integer> servicesImage)
    {
        super(fm);
        this.context=(Activity) ctx;
        dataHelper=new DataHelper(ctx);
        menuInfo=dataHelper.getTransMenuInfo();
        dataHelper.close();

        this.services = servicesName;
        this.images = servicesImage;
        this.fragments = fragments;
        menuInfo.add("Wallet To Wallet");
        menuInfo.add("Reports");
        menuInfo.add("Settings");
    }

    @Override
    public int getCount() 
    {
        return fragments.size();
    }
     public int getItemPosition(Object item) {
        //Fragment fragment = (Fragment)item;
        return POSITION_NONE;
    }

    @Override
    public Fragment getItem(int position) 
    {
        return this.fragments.get(position);
    }
}

class ViewHolder {
    TextView Title, Description, ReadMore;
}

私有类ActionBarTabMenuAdapter扩展了FragmentStatePagerAdapter
{
活动语境；
上下文ctx；
ArrayList menuInfo；
私有列表片段；
ArrayList服务；
阵列图像；
公共操作BartabMenuAdapter（FragmentManager格式、列表片段、上下文ctx、ArrayList服务名称、ArrayList服务图像）
{
超级（fm）；
this.context=（Activity）ctx；
dataHelper=新的dataHelper（ctx）；
menuInfo=dataHelper.getTransMenuInfo（）；
dataHelper.close（）；
this.services=servicesName；
this.images=servicesImage；
this.fragments=片段；
menuInfo.add（“钱包到钱包”）；
menuInfo.add（“报告”）；
menuInfo.add（“设置”）；
}
@凌驾
public int getCount（）
{
返回fragments.size（）；
}
public int getItemPosition（对象项）{
//片段=（片段）项；
返回位置\无；
}
@凌驾
公共片段getItem（int位置）
{
返回此.fragments.get（位置）；
}
}
类视图持有者{
文本视图标题、说明、阅读更多；
}
从异常情况看，您似乎试图在非UI线程中执行UI应用程序，这是被禁止的。尝试用以下内容封装您的UI代码（尤其是TestActivity.java:238）：

MenuInterface mInterface=new MenuInterface() {
    @Override
    public void loadMenu() {
        getActivity().runOnUiThread(new Runnable() {
            public void run() {
                loadFragments();
            }
        });
    }
};
我得到了同样的例外。我脑海中浮现的问题是，我是否需要使用FragmentStatePagerAdapter而不是FragmentPagerAdapter来实现所需的结果。如果是，那么如何在适配器中动态添加/删除片段？请指导我。FragmentStatePagerAdapter和FragmentPagerAdapter的主要区别在于内存管理：FragmentPagerAdapter加载所有片段并将其保存在内存中，而不是FragmentStatePagerAdapter。所以，如果你有固定数量的片段，请转到FragmentPagerAdapter，或者转到FragmentStatePagerAdapter。顺便说一句，我已经编辑了我的答案。你能测试一下吗？我已经添加了你的代码，它工作得很好，但我的问题是，如果我在点击更新后得到要加载的4个片段，我的标签就不会重新生成。我使用的是片段状态寻呼机适配器，所以我的实现有什么问题吗？我仍然不知道如何使用getItemPosition（）动态添加或删除片段适配器的方法。你能帮我这个方向吗？我已经编辑了我的代码。请看一看。正如我所说，如果您使用FragmentStatePagerAdapter，那么片段不会保存在内存中，因此您需要重新生成它们，例如Fragment.instantiate（上下文、fragmentClassName、fragmentArgs）；请你给我看一下我的数据表中的一些代码片段，它们可以帮助我实现。