android - DataAdapter 类型未定义方法 getActivity()

Question

我正在尝试使用 cwac 提供的演示......但是当我将它拉入我的 fragment 时我收到错误“方法 getActivity() 未定义类型 DataAdapter”

我确信它是上下文相关的，所以我尝试了多种方法来引用数据适配器并确保导入了正确的支持文件(即 v4)。

import java.util.ArrayList;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v4.app.Fragment;
import android.support.v4.app.ListFragment;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ArrayAdapter;

import com.commonsware.cwac.endless.EndlessAdapter;
import com.commonsware.cwac.endless.demo.EndlessAdapterCustomTaskFragment;

public class Fragment2 extends ListFragment {

    DataAdapter adapter=null;
    ArrayList<Integer> items=null;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_dod_events, container, false);

        setRetainInstance(true);

        if (adapter == null) {
          items=new ArrayList<Integer>();

          for (int i=0; i < 25; i++) {
            items.add(i);
          }

          adapter=new DataAdapter(items);
          //adapter = new DataAdapter(getActivity(), items);
          adapter.setRunInBackground(false); // Tell the adapter
                                             // we will handle
                                             // starting the
                                             // background task
        } 

        setListAdapter(adapter);        

        // Do Stuff Here
        return root;
    }

    @Override public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        // Save some state!
    }
}


class DataAdapter extends EndlessAdapter implements
IItemsReadyListener {
    private RotateAnimation rotate=null;

    DataAdapter(ArrayList<Integer> list) {

        super(new ArrayAdapter<Integer>(getActivity(), R.layout.row,
                android.R.id.text1, list));

        rotate=
                new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF,
                        0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        rotate.setDuration(600);
        rotate.setRepeatMode(Animation.RESTART);
        rotate.setRepeatCount(Animation.INFINITE);
    }

    @Override
    protected View getPendingView(ViewGroup parent) {
        View row=
                getActivity().getLayoutInflater().inflate(R.layout.row, null);

        View child=row.findViewById(android.R.id.text1);

        child.setVisibility(View.GONE);

        child=row.findViewById(R.id.throbber);
        child.setVisibility(View.VISIBLE);
        child.startAnimation(rotate);

        return(row);
    }

    @Override
    protected boolean cacheInBackground() throws Exception {
        new FetchDataTask(this, items.size()).execute();

        return(items.size()<75);
    }

    @Override
    public void onItemsReady(ArrayList<Integer> data) {
        items.addAll(data);
        adapter.onDataReady(); // Tell the EndlessAdapter to
        // remove it's pending
        // view and call
        // notifyDataSetChanged()
    }

    @Override
    protected void appendCachedData() {
    }
}

interface IItemsReadyListener {
    public void onItemsReady(ArrayList<Integer> data);
}

class FetchDataTask extends AsyncTask<Void, Void, ArrayList<Integer>> {
    IItemsReadyListener listener;

    /*
     * The point from where to start counting. In a real
     * life scenario this could be a pagination number
     */
    int startPoint;

    protected FetchDataTask(IItemsReadyListener listener, int startPoint) {
        this.listener=listener;
        this.startPoint=startPoint;
    }

    @Override
    protected ArrayList<Integer> doInBackground(Void... params) {
        ArrayList<Integer> result=new ArrayList<Integer>();

        SystemClock.sleep(3000); // pretend to do work
        for (int i=startPoint; i < startPoint + 25; i++) {
            result.add(i);
        }

        return(result);
    }

    @Override
    protected void onPostExecute(ArrayList<Integer> result) {
        listener.onItemsReady(result);
    }
}

Answer 1

试试这样调用getActivity()

Fragment2.getActivity();

内部类内部。