无法解析构造函数 ArrayAdapter
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【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;
【问题讨论】:
【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。
【讨论】:
【参考方案3】:试试
import android.widget.ArrayAdapter;
这样也能解决问题。
【讨论】:
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