FragmentPagerAdapter

Question

正在尝试本教程 https://www.youtube.com/watch?v=id46JCY76f0。逐字逐句地跟着它，但是已经达到 16:00 进入视频并且这个特定的代码给我一个不兼容的类型错误：

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentManager;


public class MyAdapter extends FragmentPagerAdapter {

final int pageCount=3;
Bundle info;

public MyAdapter(FragmentManager fm) {
    super(fm);
}


@Override
public Fragment getItem(int pos) {
    info= new Bundle();


    switch (pos){
        case 0;
            Asia asia = new Asia();
            info.putInt("currentPager", pos++);
            asia.setArguments(info);
            return asia;

        case 1;
            Africa africa = new Africa();
            info.putInt("currentPager", pos++);
            africa.setArguments(info);
            return africa;
        case 2;
            Europe eu = new Europe();
            info.putInt("currentPager", pos++);
            eu.setArguments(info);
            return eu;
    }

    return null;
}

@Override
public int getCount() {
    return 0;
}

}

错误：

必填android.support.v4.app.Fragment 找到 com.example.petakirikiri.swipetabs.Asia

import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;


public class Asia extends ListFragment{

String[] countries = {"India", "Pakistan", "Malaysia", "Bangladesh", "Singapore"};
ArrayAdapter<String> adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    adapter =new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_multiple_choice, countries);
    setListAdapter(adapter);

    return super.onCreateView(inflater, container, savedInstanceState);
}

@Override
public void onStart() {
    super.onStart();
    getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
}

}

Answer 1

你们在用 Fragment 扩展亚洲吗？此外，在这种情况下，片段必须匹配 - 即有两种类型：

android.support.v4.app.Fragment

和

android.app.Fragment;

如果它们不相同，您将收到类型不匹配错误。

FragmentPagerAdapter - 不兼容的类型

FragmentPagerAdapter - Incompatible Types

android

android-fragments

android-fragmentactivity