Android TabsPagerAdapter类错误“；“类型不匹配”；

我在TabsPagerAdapter类中遇到问题，错误显示…

类型不匹配：无法从MapActivity转换为Fragment

帮助我解决此问题

注

选项卡SpagerAdapter

类是

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;




public class TabsPagerAdapter extends FragmentPagerAdapter {

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

@Override
public Fragment getItem(int index) {

    switch (index) {
    case 0:
        // Map fragment activity
        return new MapActivity();
    case 1:
        // Directions fragment activity
        return new Directions();
    case 2:
        // Places fragment activity
        return new Places();
    }

    return null;
}

@Override
public int getCount() {
    // get item count - equal to number of tabs
    return 3;
}

}   

---

您必须只返回

片段的实例。但是这里您的
MapActivity
是
FragmentActivity
而不是
Fragment
…好的，我想从activity返回任何类型，如果它是Fragment或FragmentActivity，那么代码中会有什么变化？
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;




public class TabsPagerAdapter extends FragmentPagerAdapter {

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

@Override
public Fragment getItem(int index) {

    switch (index) {
    case 0:
        // Map fragment activity
        return new MapActivity();
    case 1:
        // Directions fragment activity
        return new Directions();
    case 2:
        // Places fragment activity
        return new Places();
    }

    return null;
}

@Override
public int getCount() {
    // get item count - equal to number of tabs
    return 3;
}

}