无法解析构造函数 ArrayAdapter

Posted 2023-04-15

【中文标题】无法解析构造函数 ArrayAdapter

【英文标题】：Cannot resolve constructor ArrayAdapter

【发布时间】：2015-05-05 02:29:16

【问题描述】：

我在OnCreateView 方法中使用listAdapter 得到一个Cannot resolve constructor ArrayAdapter 我试图在我的选项卡中列出文本数据，这是我的主要活动。任何帮助将不胜感激，我仍然是 Java 的菜鸟。

public class MainActivity extends ActionBarActivity 

    private Toolbar toolbar;
    private ViewPager mPager;
    private SlidingTabLayout mTabs;

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

        toolbar = (Toolbar) findViewById(R.id.app_bar);
        setSupportActionBar(toolbar);

        mPager= (ViewPager) findViewById(R.id.viewPager);
        mTabs=(SlidingTabLayout) findViewById(R.id.tabs);
        mPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
        mTabs.setDistributeEvenly(true);
        mTabs.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
        mTabs.setSelectedIndicatorColors(getResources().getColor(R.color.colorAccent));
        mTabs.setViewPager(mPager);
    

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    

    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in androidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) 
            return true;
        

        return super.onOptionsItemSelected(item);
    

    class MyPagerAdapter extends FragmentPagerAdapter 

        String[] tabs;

        public MyPagerAdapter(FragmentManager fm) 
            super(fm);
            tabs=getResources().getStringArray(R.array.tabs);
        

        @Override
        public Fragment getItem(int position) 

            MyFragment myFragment=MyFragment.getInstance(position);
            return myFragment;
        

        @Override
        public CharSequence getPageTitle(int position) 
            return tabs[position];
        

        @Override
        public int getCount() 
            return 5;
        
    

    public static class MyFragment extends Fragment 

        private TextView textView;
        private ListView mainListView;
        private ArrayAdapter<String> listAdapter ;

        public static MyFragment getInstance(int position)

            MyFragment myFragment=new MyFragment();
            Bundle  args=new Bundle();
            args.putInt("position", position);
            myFragment.setArguments(args);
            return myFragment;
        

        @Override

        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 

            View layout=inflater.inflate(R.layout.fragment_my, container, false);

            mainListView=(ListView) layout.findViewById(R.id.position);

            String[] planets = new String[]  "Mercury", "Venus", "Earth", "Mars",
                    "Jupiter", "Saturn", "Uranus", "Neptune";
            ArrayList<String> planetList = new ArrayList<String>();
            planetList.addAll( Arrays.asList(planets) );

            listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);
            mainListView.setAdapter( listAdapter );
            return layout;
        
    

【参考方案1】：

改变

 listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);

到

 listAdapter = new ArrayAdapter<String>(getActivity(), R.layout.simplerow, planetList);

您可以使用getActivity()在Fragment中获取Context。

【讨论】：

哇，就这么简单！谢谢

[unchecked] unchecked call to ArrayAdapter(Context,int,List<T>) as a member of the raw type ArrayAdapter where T is a type-variable

【参考方案2】：

将this 替换为activityName.this 改变

listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);

与

listAdapter = new ArrayAdapter<String>(activityName.this, R.layout.simplerow, planetList);

这解决了我在 asyncTask 中使用的问题。

【参考方案3】：

试试

import android.widget.ArrayAdapter;

这样也能解决问题。