android多个片段通过同一个接口与活动进行通信

Question

我正在开发一个我希望迁移到多个平台的应用程序。为方便移植，我使用Fragments简化了流程。所以我现在所拥有的只有一个Activity和几个fragments。在一种情况下，我有几个相同fragment的实例，具有不同的数据。显然，同一片段的每个实例都将使用相同的接口函数。

我添加了参数＆＃34; tag＆＃34;接口函数识别片段的每个实例（使用创建片段时使用的标签）。我想也可以使用resource ID。

我的问题：这是一个很好的方法吗？是否有更好或更容易接受的方法？

活动代码段：

public class SailboatRaceActivity extends FragmentActivity
    implements SR_CommandsFragment.OnSR_CommandsSelectedListener,
    SR_SubCommands_Fragment.OnSR_SubCommandsSelectedListener,
    FleetListFragment.FleetList_WidthChange,
    FleetListFragment.FleetListChange,
    FleetScoringFragment.OnFS_SelectedListener,
    FleetSpinnerFragment.FleetSpinner_Selection {
// State Variables
private int mSubCommandPositon;
private int mCommandPosition;
private int mFleetSelection;
private int mFleetListColumnWidth = 0;

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

    if (savedInstanceState != null) {
        mSubCommandPositon = savedInstanceState.getInt("mSubCommandPositon");
        mCommandPosition = savedInstanceState.getInt("mCommandPosition");
        mFleetSelection = savedInstanceState.getInt("mFleetSelection");
        mFleetListColumnWidth = savedInstanceState.getInt("mFleetListColumnWidth");
    }
    setContentView(R.layout.sailboat_race_layout);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
}

public void onSR_CommandSelected(int position) {
    SR_SubCommands_Fragment SR_SubCFrag = (SR_SubCommands_Fragment) getFragmentManager().findFragmentById(R.id.subcommands);
    mCommandPosition = position;
    if (SR_SubCFrag != null) {
        SR_SubCFrag.update_SR_subcommands(position);
        SR_SubCFrag.ChangeListViewWidth(mFleetListColumnWidth);
    }
}

public void onSR_SubCommandSelected(int position) {
    mSubCommandPositon = position;
    FleetScoringFragment FSFrag = (FleetScoringFragment) getFragmentManager().findFragmentById(R.id.fleet_scoring);
    if (FSFrag != null) {
        FSFrag.update_commands(mCommandPosition, mSubCommandPositon);
    }
}

@Override
public void onSaveInstanceState(Bundle outState) {
    outState.putInt("mSubCommandPositon", mSubCommandPositon);
    outState.putInt("mCommandPosition", mCommandPosition);
    outState.putInt("mFleetSelection", mFleetSelection);
    outState.putInt("mFleetListColumnWidth", mFleetListColumnWidth);
    super.onSaveInstanceState(outState);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public void FleetList_WidthChange(int width) {
    mFleetListColumnWidth = width;
    // can we set width of other two lists
    SR_SubCommands_Fragment SR_SubCFrag = (SR_SubCommands_Fragment) getFragmentManager().findFragmentById(R.id.subcommands);
    if (SR_SubCFrag != null) {

        SR_SubCFrag.ChangeListViewWidth(width);
    }
    SR_CommandsFragment SR_CFrag = (SR_CommandsFragment) getFragmentManager().findFragmentById(R.id.commands);
    if (SR_CFrag != null) {

        SR_CFrag.ChangeListViewWidth(width);
    }
}

@Override
public void FleetListChange(int position) {
    FleetScoringFragment FSFrag = (FleetScoringFragment) getFragmentManager().findFragmentById(R.id.fleet_scoring);
    if (FSFrag != null) {
        mFleetSelection = position;
        FSFrag.update_FleetScoringList(position);
    }
    FleetScoringHeaderFragment FSHFrag = (FleetScoringHeaderFragment) getFragmentManager().findFragmentById(R.id.scoring_header);
    if (FSHFrag != null) {
        mFleetSelection = position;
        FSHFrag.update_FleetScoringHeader(position);
    }
}

@Override
public void onFS_Selected(int position) {


}

@Override
public void FSpinner_selection(int selection, String tag) {
    int fs = selection;
    String thistag =tag;
    // do something
}

FSpinner_selection界面是我正在处理的界面。我设置此实现只是为了检查数据是否有效。

FleetSpinner片段：

public class FleetSpinnerFragment extends Fragment  {
private int nPresentFleetPosition;
public ArrayList<FleetItem> mListArray = new ArrayList<FleetItem>();
FleetSpinnerAdapter adapter;
FleetSpinner_Selection mCallback;
Spinner spinner;
String tag;


public interface FleetSpinner_Selection {
    public void FSpinner_selection(int selection, String tag);
}

public FleetSpinnerFragment() {
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mCallback = (FleetSpinner_Selection) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString()
                + " must implement FSpinner_Selection");
    }
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (savedInstanceState == null) {
        nPresentFleetPosition = 0;
        for (int i = 0; i<Fleet.fleetbit.length;i++) {
            mListArray.add(Fleet.fleetbit[i]);
        }
    } else {
        nPresentFleetPosition = savedInstanceState.getInt("nPresentFleetPosition");
        ArrayList temp = savedInstanceState.getParcelableArrayList("thisFleetList");
        mListArray.addAll(temp);
    }
}

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    savedInstanceState.putInt("nPresentFleetPosition", nPresentFleetPosition);
    ArrayList<FleetItem>  temp = new ArrayList<FleetItem>();
    for (int i =0 ; i< adapter.getCount();i++){
        temp.add(adapter.getItem(i));
    }
    savedInstanceState.putParcelableArrayList("thisFleetList", temp);
    super.onSaveInstanceState(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = new View(getActivity());

    adapter = new FleetSpinnerAdapter(getActivity(), R.layout.fleet_list_item);
    spinner = new Spinner(getActivity());
    spinner.setAdapter(adapter);
    adapter.addAll(Fleet.fleetbit);
    spinner.setOnItemSelectedListener(new CustomOnItemSelectedListener());
    tag = getTag();
    spinner.setSelection(nPresentFleetPosition);
    return spinner;
}

public void update_FleetScoringHeader(int position) {

    nPresentFleetPosition = position;
    FrameLayout FLScoringHeader = (FrameLayout) getActivity().findViewById(R.id.scoring_header);
    TextView v1 = (TextView) FLScoringHeader.findViewById(R.id.fleet_list_item_textview);
    v1.setText(Fleet.fleetbit[nPresentFleetPosition].name);
    ImageView v0 = (ImageView) FLScoringHeader.findViewById(R.id.fleet_list_item_icon);
    v0.setImageResource(Fleet.fleetbit[nPresentFleetPosition].id);
}

static class FleetHolder {
    ImageView imgIcon;
    TextView txtTitle;
}

public class CustomOnItemSelectedListener extends Activity implements AdapterView.OnItemSelectedListener {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        FleetItem temp = (FleetItem) parent.getItemAtPosition(position);
        nPresentFleetPosition  = position;
        mCallback.FSpinner_selection(position, tag);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
}

我刚刚开始学习android编程，所以这可能是一个非常棒的问题。