checkbox..setOnCheckedChangeListener() 在片段中不起作用

Question

方法 .setOnCheckedChangeListener(MyFragmentList.this) 被IDE 标记为红色下划线...我不明白我必须将什么参数传递给Fragment 中的方法setOnCheckedChangeListener。 谢谢。

适配器代码：

public class PlanetAdapter extends ArrayAdapter<Planet>

{

  private List<Planet> planetList;
  private Context context;
  ArrayList<Planet> objects;


  public  PlanetAdapter(List<Planet> planetList, Context context) {
      super(context, R.layout.single_listview_item, planetList);
      this.planetList = planetList;
      this.context = context;
  }




    public  class PlanetHolder  {
      public TextView planetName;
      public TextView distView;
      public TextView valuta;
      public CheckBox chkBox;
      public EditText edit;
      public String quantità;



  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {

View row = convertView;
      PlanetHolder holder = null;
      if (row == null) {
          LayoutInflater inflater = ((Activity) context).getLayoutInflater();
          row = inflater.inflate(R.layout.single_listview_item, parent, false);
          holder = new PlanetHolder();
          holder.planetName = (TextView) row.findViewById(R.id.name);
          holder.distView = (TextView) row.findViewById(R.id.dist);
          holder.valuta = (TextView) row.findViewById(R.id.valuta);
          holder.chkBox = (CheckBox) row.findViewById(R.id.chk_box);
          holder.edit = (EditText) row.findViewById(R.id.editText);
          holder.edit.setVisibility(View.GONE);
          holder.edit.setEnabled(false);
          row.setTag(holder);
      } else {
          holder = (PlanetHolder) row.getTag();
      }
      final Planet p = planetList.get(position);

      holder.chkBox.setOnCheckedChangeListener(MyListFragment.this);
      final PlanetHolder finalHolder = holder;
      holder.chkBox.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              if (finalHolder.chkBox.isChecked()) {
                  finalHolder.edit.setVisibility(View.VISIBLE);
                  finalHolder.edit.setEnabled(true);
                  finalHolder.edit.addTextChangedListener(new TextWatcher() {
                      @Override
                      public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                      }

                      @Override
                      public void onTextChanged(CharSequence s, int start, int before, int count) {
                      }

                      @Override
                      public void afterTextChanged(Editable s) {
                          p.setQuantità(finalHolder.edit.getText().toString().trim());

                      }
                  });
              } else {
                  finalHolder.edit.setVisibility(View.GONE);
                  finalHolder.edit.setEnabled(false);
                  finalHolder.edit.setText(null);
              }
          }
      });
      holder.planetName.setText(p.getName());
      holder.distView.setText("" + p.getDistance());
      holder.valuta.setText(""+p.getValuta());
      holder.chkBox.setChecked(p.isSelected());
      holder.chkBox.setTag(p);
      holder.edit.setEnabled(false);

      return row;
  }


  ArrayList<Planet> getBox() {
      ArrayList<Planet> box = new ArrayList<Planet>();
      for (Planet p : planetList) {
          if (p.selected)
              box.add(p);
      }
      return box;
  }


}

活动：

public class Main extends AppCompatActivity  {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        getSupportFragmentManager().beginTransaction().

                replace(R.id.fragmentContainer, new MyListFragment()).commit();



    }


}

片段：

public class MyListFragment extends Fragment implements
        android.widget.CompoundButton.OnCheckedChangeListener {

    ListView lv;
    ArrayList<Planet> planetList;
    PlanetAdapter plAdapter;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_list2, container, false);
        Button mButton = (Button) rootView.findViewById(R.id.button);
        mButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            showResult(v);

            }
        });
        //return inflater.inflate(R.layout.fragment_list2, container, false);
        return  rootView;
    }


    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        lv = (ListView)getView().findViewById(R.id.listview);
        displayPlanetList();
    }


    private void displayPlanetList() {

        planetList = new ArrayList<Planet>();
        planetList.add(new Planet("Margherita", 6, "€"));
        planetList.add(new Planet("Diavola", 7,"€"));
        planetList.add(new Planet("Bufalina", 5,"€"));
        planetList.add(new Planet("Marinara", 5,"€"));
        planetList.add(new Planet("Viennese", 4,"€"));

        plAdapter = new PlanetAdapter(planetList, getContext());
        lv.setAdapter(plAdapter);
    }



    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

        int pos = lv.getPositionForView(buttonView);
        if (pos != ListView.INVALID_POSITION) {
            Planet p = planetList.get(pos);
            p.setSelected(isChecked);



        /*Toast.makeText(
                getActivity(),
                "Clicked on Planet: " + p.getName() + ". State: is "
                        + isChecked, Toast.LENGTH_SHORT).show();*/
        }

    }


    public void showResult(View v) {
        String result = "Selected Product are :";
        int totalAmount=0;

        for (Planet p : plAdapter.getBox()) {
            if (p.selected){
                //System.out.println("pizza selezionata: " + p.name);

                    //System.out.println("nessuna pizza selezionata: ");



                result += "\n" + p.name+" "+p.distance+"€"+"q.tà :"+p.getQuantità();
                //if (p.quantità.equals("") && p.quantità.equals(null) ){
                //System.out.println("leggo questo record:"+p.name + " " + p.distance + " " + p.quantità );

                //System.out.println("leggo questo p.getquatità :"+p.quantità );
                //}
                //else{
                //System.out.println("leggo questo in p.quantità: " + p.getQuantità());
                int quantitaInt= Integer.parseInt(p.getQuantità() );
                totalAmount+=p.distance * quantitaInt;

                //}
            }
        }
      Toast.makeText(getActivity(), result + "\n" + "Total Amount:=" + totalAmount, Toast.LENGTH_LONG).show();
        //System.out.println("leggo result e total amount: " + result + " " + totalAmount);



        //Integer.toString(totalAmount);
    //  Intent i = new Intent(getActivity(), TwoFragment.class);
        /*i.putExtra("NomeDati1", result);
        i.putExtra("NomeDati2", String.valueOf(totalAmount));
        startActivity(i);
*/

    }

}

编辑：

当我使用@Nathanael 的解决方案时出现以下错误

Answer 1

我认为你应该改变方法，因为当你在适配器中使用复选框时，你的适配器列表项对象中应该有一个布尔值，并且所有检查 true 和 false 的检查都应该在“getView”中处理，并且检查时只更改项目.setChecked 应该更改请参阅下面的代码，这只是示例代码，您也可以使用 viewholder 来完成

public class MyAdapter extends BaseAdapter {

private List<MyItem> items;
private LayoutInflater inflater;

public MyAdapter(Context context, List<MyItem> items) {
    this.items = items;
    this.inflater = LayoutInflater.from(context);
}

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

@Override
public MyItem getItem(int position) {
    return items.get(position);
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    MyItem item=getItem(position);
    View view=inflater.inflate(R.layout.adapteritem,null);
    CheckBox checkBox=(CheckBox)view.findViewById(R.id.chb);
    TextView txt=(TextView)view.findViewById(R.id.title);
    if(item.isChecked)
    {
        txt.setText(item.title+" Selected");
    }else{
        txt.setText(item.title+" Not Selected");
    }
    checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            item.isChecked=isChecked;
            notifyDataSetChanged();
        }
    });

    return view;
}

public class MyItem {
    public boolean isChecked = false;
    public String title;
}

}

Answer 2

你需要传入CompoundButton.OnCheckedChangeListener的实现。

holder.chkBox.setOnCheckedChangeListener(CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            // Do what you need to do
        }
});

Here 是 CheckedChangeListener 的 API 参考

Answer 3

对于片段首先我们需要实现 android.widget.CompoundButton.OnCheckedChangeListener 看这个例子

public class TabAdvertiser extends Fragment implements android.widget.CompoundButton.OnCheckedChangeListener {

CheckBox mCbShowPwd;
EditText userName,password;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    FacebookSdk.sdkInitialize(getActivity());
    View view = inflater.inflate(R.layout.login, container, false);

    userName=(EditText)view.findViewById(R.id.input_email);
    password=(EditText)view.findViewById(R.id.input_password);
    // get the show/hide password Checkbox
    mCbShowPwd = (CheckBox)view.findViewById(R.id.cbShowPwd);
    mCbShowPwd.setOnCheckedChangeListener(TabAdvertiser.this);
    return view;
}
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    // checkbox status is changed from uncheck to checked.
    if (!isChecked) {
        // show password
        password.setTransformationMethod(PasswordTransformationMethod.getInstance());
    } else {
        // hide password
        password.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
    }
}

}