Question

我正在努力绕过碎片和活动。

我正在编写一个应用程序，它使用ActionBar浏览“精选音频项目”列表，以及一个包含自己的“音频项目”列表的“程序”列表。我正在使用ActionBarSherlock和兼容包。

单击ActionBar选项卡时，它应显示该活动/片段。当您单击列表中的某些内容时，它应该打开一个显示该程序/音频项的新片段/活动。

我查看了各种演示/示例，并了解有几种方法可以做到这一点。

我的问题：

该计划的结构是什么？
- e.g。每个片段的活动？一个有很多碎片的活动？
你如何导航片段？
- e.g。意图？
如何在所有活动中使用持久性ActionBar？

感谢您提供任何帮助

编辑 - 回答我自己的问题：

所以我采用了这种方法：

初始化ActionBar的主要活动，处理主要的碎片导航。
每个主要片段都有一个onClickListener
onClickListener将当前显示的片段替换为新片段，初始化为显示正确的项目

这是基于我在评论中提到的ActionbarSherlock FragmentLayoutSupport演示。

主要列表片段摘要：

//public class ProgrammesFragment extends SherlockListFragment

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    showDetails(id);
}

/**
 * Helper function to show the details of a selected item, either by
 * displaying a fragment in-place in the current UI, or starting a
 * whole new activity in which it is displayed.
 */
void showDetails(long index) {
    // Check what fragment is currently shown, replace if needed.
    ProgrammeFragment details = (ProgrammeFragment) getFragmentManager().findFragmentByTag(ProgrammeFragment.TAG);
    if (details == null || details.getShownIndex() != index) {
        // Make new fragment to show this selection.
        details = ProgrammeFragment.newInstance(index);

        // Execute a transaction, replacing any existing fragment
        // with this one inside the frame.
        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.remove(getFragmentManager().findFragmentByTag(ProgrammesFragment.TAG));
        ft.add(android.R.id.content, details, ProgrammeFragment.TAG);
        ft.addToBackStack(null);
        ft.commit();
    }
}

详细信息片段摘录

//public class ProgrammeFragment extends SherlockListFragment

/**
 * Create a new instance of ProgrammeFragment, initialized to
 * show the text at 'index'.
 */
public static ProgrammeFragment newInstance(long index) {
    ProgrammeFragment f = new ProgrammeFragment();

    // Supply index input as an argument.
    Bundle args = new Bundle();
    args.putLong("programme_id", index);
    f.setArguments(args);

    return f;
}

public long getShownIndex() {
    return getArguments().getLong("programme_id", 0);
}

详细信息片段在SQL ContentResolver之上使用LoaderManager，并调用getShownIndex为select查询构建条件。

这适用于（现在），不确定内存使用情况或任何此类事情。但我们会看到！

似乎这样可以让你的思绪更加清晰，这样你就可以回答自己的问题：P

Answer 1

在主活动的onCreate中，您可以创建并添加所有选项卡（一个选项卡= 1个SherlockFragment类）。在您的主要活动中，您必须有一个TabAdapter的内部类。在下面的示例中，TabAdapter也是一个ViewPager，因此您可以在屏幕上的任意位置滑动，左右滑动以在选项卡之间切换。这是主要课程：

import java.util.ArrayList;
import library.DatabaseHandler;
import library.UserFunctions;

import org.json.JSONObject;
import com.actionbarsherlock.R;
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;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View.OnClickListener;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;

public class Polling extends SherlockFragmentActivity {
    private ViewPager mViewPager;
    private TabsAdapter mTabsAdapter;
    ActionBar bar;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mViewPager = new ViewPager(this);
        mViewPager.setId(R.id.pager);
        setContentView(mViewPager);
        bar = getSupportActionBar();
        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        bar.setDisplayShowTitleEnabled(false);
        bar.setDisplayShowHomeEnabled(false);

        mTabsAdapter = new TabsAdapter(this, mViewPager);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.login),
                LoginFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.economics),
                EconFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.elections),
                ElectionsFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.politics),
                PoliticsFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.science),
                ScienceFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.finance),
                FinanceFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.religion),
                ReligionFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.military),
                MilitaryFragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.international),
                InternationalFragment.class, null); 
    }


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

        public void onPageSelected(int position) {
            mActionBar.setSelectedNavigationItem(position);
        }
        public void onPageScrollStateChanged(int state) {}
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}

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

这是一个没有任何主要UI的片段（只是一个带有一个TextView的xml文件）：

import com.actionbarsherlock.R;
import com.actionbarsherlock.app.SherlockFragment;

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FinanceFragment extends SherlockFragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        return inflater.inflate(R.layout.financefragment, container, false);
    }
}

onResume / onCreateView中具有临时UI的另一个片段：

import com.actionbarsherlock.R;
import com.actionbarsherlock.app.SherlockFragment;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class EconFragment extends SherlockFragment {

    private TableLayout questionContainer;
    int pos = 0;
    private String[] titles = {"The first title ", "hallo1","hallo2", "hallo3",
            "hallo4", "hallo5","hallo6", "hallo7","hallo8", "hallo9"};

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Log.v("Econ", "onCreateView");
        View v = inflater.inflate(R.layout.econfragment, container, false);
        questionContainer = (TableLayout) v.findViewById(R.id.questionContainer);
        //bs
        int leftMargin=5;
        int topMargin=5;
        int rightMargin=5;
        int bottomMargin=5;
        while (pos < 10) {
        View question = inflater.inflate(R.layout.question, null);
        question.setId(pos);
        TextView title = (TextView) question.findViewById(R.id.questionTextView);
        title.setText(titles[pos]);
        Button charts = (Button) question.findViewById(R.id.chartsButton);
        charts.setId(pos);
        charts.setOnClickListener(chartsListener);
        TableRow tr = (TableRow) question;
        TableLayout.LayoutParams trParams = new TableLayout.LayoutParams(
                TableLayout.LayoutParams.MATCH_PARENT,
                TableLayout.LayoutParams.WRAP_CONTENT);
        trParams.setMargins(leftMargin, topMargin, rightMargin, bottomMargin);
        tr.setLayoutParams(trParams);
        Log.v("econ", "while loop");
        questionContainer.addView(tr);
        pos++;
        }
        pos = 0;
        return v;
    }

    public void onResume() {
        super.onResume();
        Log.v("Econ", "onResume");
    }

    public OnClickListener chartsListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent chart = new Intent();
            chart.setClass(getActivity(), Chart.class);
            chart.putExtra("key", titles[v.getId()]);
            Log.v("TAG", Integer.toString(v.getId()));
            startActivity(chart);

        }

    };

    public void onAttach(Activity activity) {
        super.onAttach(activity);
        Log.d("Econ", "onAttach");
    }

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d("Econ", "onCreate");
        //Log.v("ECON", savedInstanceState.toString());

    }

    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        Log.d("Econ", "onActivityCreated");
    }

    public void onStart() {
        super.onStart();
        Log.d("Econ", "OnStart");
    }

    public void onPause() {
        super.onPause();    
        Log.d("Econ", "onpause");
    }

    public void onStop() {
        super.onStop();
        Log.d("Econ", "onstop");
    }

    public void onDestroyView() {
        super.onDestroyView();
        Log.d("Econ", "ondestroyview");
    }

    public void onDestroy() {
        super.onDestroy();
        Log.d("Econ", "ondestroy");

    }

    public void onDetach() {
        super.onDetach();
        Log.d("Econ", "ondetach");
    }
}

编辑〜我还没有记录我的代码 - 其中一些仅仅是我在网上找到的例子。如果您有任何障碍或事情您不明白，请问。

无法绕过Android Fragments

编辑 - 回答我自己的问题：

1 个答案: