Android 无法应用CustomListAdapter中的CustomListAdapter（）

我是android新手，我正在尝试创建一个应用程序，它将根据用户的状态显示用户，在应用程序中，我使用带有片段的导航抽屉

当我试图列出某人的特定类别时，我犯了一个错误。i、 e

Error:(50, 57) error: incompatible types: Past cannot be converted to Activity
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.

编译失败；有关详细信息，请参阅编译器错误输出

获取错误“CustomListAdapter中的CustomListAdapter（）无法应用”

---

传递

this.getActivity（）

而不是

this

。如果仍然出现错误，请使用新错误更新您的问题。

除了注释中指出的问题外，在设置适配器之前，您还将从onCreateView（）方法返回，因此存在无法访问的代码问题

设置对膨胀视图的引用，使用该视图查找ListView，然后在方法末尾返回该视图：

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_past, container, false); //modified

        CustomListAdapter adapter = new CustomListAdapter(getActivity(), itemname, imgid);

        list=(ListView) rootView.findViewById(R.id.list); //modified
        list.setAdapter(adapter);

        return rootView; //added
    }

---

初始化适配器时，您正在将片段上下文传递给活动上下文，即CustomListAdapter=new CustomListAdapter（this，itemname，imgid）；尝试将其更改为CustomListAdapter=new CustomListAdapter（getActivity（），itemname，imgid）；tryi已经试过了，它给出了一个不可搜索的语句错误。你发布的日志显示了这个错误，所以这次更改会更新日志。编辑后，我得到了相同的错误“unreachable statement”错误：（47，27）错误：unreachable statement错误：（62，5）错误：缺少返回语句注意：某些输入文件使用或重写不推荐使用的API。注意：使用-Xlint重新编译：不推荐使用以获取详细信息。错误：任务执行失败：app:compiledBugJavaWithJavaC。“>编译失败；有关详细信息，请参阅编译器错误输出。@Raghavendra此问题已解决。感谢支持意味着lotI am ha同样的问题，但是IDE也不支持getActivity。

 import android.app.Activity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;


 public class CustomListAdapter extends ArrayAdapter<String> {

 private final Activity context;
 private final String[] itemname;
 private final Integer[] imgid;

public CustomListAdapter(Activity context, String[] itemname, Integer[] imgid) {
    super(context, R.layout.mylist, itemname);
    // TODO Auto-generated constructor stub

    this.context=context;
    this.itemname=itemname;
    this.imgid=imgid;
}

public View getView(int position,View view,ViewGroup parent) {
    LayoutInflater inflater=context.getLayoutInflater();
    View rowView=inflater.inflate(R.layout.mylist, null,true);

    TextView txtTitle = (TextView) rowView.findViewById(R.id.item);
    ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
    TextView extratxt = (TextView) rowView.findViewById(R.id.textView1);

    txtTitle.setText(itemname[position]);
    imageView.setImageResource(imgid[position]);
    extratxt.setText("Description "+itemname[position]);
    return rowView;

   };
 }

     else if(i==1){
        switch (j){

            case 0:
                Past past = new Past();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.frameholde,past);
                fragmentTransaction.commit();
                break;

            case 1:
                Current current = new Current();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.frameholde, current);
                fragmentTransaction.commit();
                break;

            case 2:
                Area area = new Area();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.frameholde, area);
                fragmentTransaction.commit();
                break;

        }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_past, container, false); //modified

        CustomListAdapter adapter = new CustomListAdapter(getActivity(), itemname, imgid);

        list=(ListView) rootView.findViewById(R.id.list); //modified
        list.setAdapter(adapter);

        return rootView; //added
    }