Question

再次问，因为上一个主题没有回答...... 我试图使用FragmentPagerAdapter，但在尝试运行时 - 出现错误：

02-22 22：48：53.328：W / dalvikvm（830）：无法解决超类 Linfo / androidhive / tabsswipe / SlideActivity $ FragmentPagerAdapter; （94） 02-22 22：48：53.328：W / dalvikvm（830）：班级的联系 'Linfo / androidhive / tabsswipe / SlideActivity $ FragmentPagerAdapter;' 失败02-22 22：48：53.328：E / dalvikvm（830）：找不到上课 'info.androidhive.tabsswipe.SlideActivity $ FragmentPagerAdapter'，从方法中引用 info.androidhive.tabsswipe.SlideActivity.onCreate

我的代码：

package info.androidhive.tabsswipe;


import info.androidhive.tabsswipe.SlideFragment;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;

public class SlideActivity extends FragmentActivity {

private static final int NUM_PAGES = 5;


private ViewPager mPager;


private PagerAdapter mPagerAdapter;

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

    // Instantiate a ViewPager and a PagerAdapter.
    mPager = (ViewPager) findViewById(R.id.pager);
    mPagerAdapter = new FragmentPagerAdapter(getFragmentManager());
    mPager.setAdapter(mPagerAdapter);
    mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {

            invalidateOptionsMenu();
        }
    });
} 

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);
    getMenuInflater().inflate(R.menu.activity_screen_slide, menu); 

    menu.findItem(R.id.action_previous).setEnabled(mPager.getCurrentItem() > 0);


    MenuItem item = menu.add(Menu.NONE, R.id.action_next, Menu.NONE,
            (mPager.getCurrentItem() == mPagerAdapter.getCount() - 1)
                    ? R.string.action_finish
                    : R.string.action_next);
    item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {


        case R.id.action_previous:

            mPager.setCurrentItem(mPager.getCurrentItem() - 1);
            return true;

        case R.id.action_next:

            // will do nothing.
            mPager.setCurrentItem(mPager.getCurrentItem() + 1);
            return true;
    }

    return super.onOptionsItemSelected(item);
}


public static class FragmentPagerAdapter extends FragmentStatePagerAdapter {
    public FragmentPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return SlideFragment.create(position);
    }

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

已经尝试构建路径，清理并导入android.support.v13.app.FragmentPagerAdapter;

感谢。

Answer 1

您输入错误：

import android.app.Fragment;
import android.app.FragmentManager;

应该是

import android.support.v4.app.FragmentManager
import android.support.v4.app.Fragment

和

mPagerAdapter = new FragmentPagerAdapter(getFragmentManager());

应该是

mPagerAdapter = new FragmentPagerAdapter(getSupportFragmentManager());

您可以查看FragmentActivity here中的文档。

无法解析FragmentPagerAdapter的超类

1 个答案: