正确的方式和位置初始化适配器

Question

我想为我的列表视图设置一个过滤器，但我遇到了这些错误。

Cannot resolve symbol 'myAdapter'

我知道myAdapter尚未初始化，但我不知道我哪班的，我需要声明进去。

error: method setOnQueryTextListener in class SearchView cannot be applied to given types; required: android.support.v7.widget.SearchView.OnQueryTextListener found: android.widget.SearchView.OnQueryTextListener reason: actual argument android.widget.SearchView.OnQueryTextListener cannot be converted to android.support.v7.widget.SearchView.OnQueryTextListener by method invocation conversion

我知道android.widget.SearchView.OnQueryTextListener不能转换到android.support.v7.widget.SearchView.OnQueryTextListener但我不知道我的代码中需要更改什么。我的应用程序使用支持库。所有的帮助将不胜感激。

VictoriaLineActivity.java

public class VictoriaLineActivity extends ActionBarActivity { 

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

     ActionBar actionBar = getSupportActionBar(); 
     //change background colour of action bar 
     actionBar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#0098D4"))); 
     //change text colour of action bar 
     actionBar.setTitle(Html.fromHtml("<font color='#FFFFFF'>Victoria line</font>")); 

     //enable and show action bar back button 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setDisplayShowHomeEnabled(false); 

     FragmentVictoriaLine newFragment = new FragmentVictoriaLine(); 
     FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); 
     transaction.replace(R.id.master_container, newFragment); 
     transaction.commit(); 

     handleIntent(getIntent()); 
    } 

    @Override 
    protected void onNewIntent(Intent intent) { 
     handleIntent(intent); 
    } 

    private void handleIntent(Intent intent) { 

     if (Intent.ACTION_SEARCH.equals(intent.getAction())) { 
      String query = intent.getStringExtra(SearchManager.QUERY); 
     } 
    } 
} 

FragmentVictoriaLine.java

public class FragmentVictoriaLine extends android.support.v4.app.Fragment implements { 

    private class Victoria { 
     private CharSequence station; 
     private CharSequence zone; 
     private Class<? extends Activity> activityClass; 
     private Class<? extends android.support.v4.app.Fragment> fragmentClass; 

     public Victoria(int stationResId, int zoneResId, Class<? extends Activity> activityClass, Class<? extends android.support.v4.app.Fragment> fragmentClass) { 
      this.fragmentClass = fragmentClass; 
      this.activityClass = activityClass; 
      this.station = getResources().getString(stationResId); 
      this.zone = getResources().getString(zoneResId); 
     } 

     @Override 
     public String toString() { return station.toString(); } 
     public String getzone(){ return zone.toString(); } 
    } 

    private static Victoria[] mVictoria; 

    /** 
    * Whether or not the activity is in two-pane mode, i.e. running on a tablet 
    * device. 
    */ 
    public boolean mTwoPane; 

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){ 
     View v = inflater.inflate(R.layout.fragment_victoria_line, container, false); 

     if (getActivity().findViewById(R.id.detail_container) != null) { 
      mTwoPane = true; 
     }else{ 
      mTwoPane = false; 
     } 

     // Instantiate the list of stations. 
     mVictoria = new Victoria[]{ 
       new Victoria(R.string.bank, R.string.zone_1, WCBankActivity.class, FragmentWCBank.class), 
       new Victoria(R.string.wat, R.string.zone_1, WCWATActivity.class, FragmentWCWAT.class) 

     }; 

     final ListView listView = (ListView)v.findViewById(R.id.list_victoria); 
     listView.setAdapter(new MyAdapter(getActivity(), mVictoria)); 
     listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 
     listView.setTextFilterEnabled(true); 

     }); 

     return v; 
    } 

    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 

     setHasOptionsMenu(true); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu items for use in the action bar 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.menu_victoria_line, menu); 

     // Associate searchable configuration with the SearchView 
     SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE); 
     SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView(); 
     searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); 
     searchView.setIconifiedByDefault(false); 

     android.support.v7.widget.SearchView.OnQueryTextListener textChangeListener = new android.support.v7.widget.SearchView.OnQueryTextListener() 
     { 
      @Override 
      public boolean onQueryTextChange(String newText) 
      { 
       // this is your adapter that will be filtered 
       myAdapter.getFilter().filter(newText); 
       return true; 
      } 
      @Override 
      public boolean onQueryTextSubmit(String query) 
      { 
       // this is your adapter that will be filtered 
       myAdapter.getFilter().filter(query); 
       return true; 
      } 
     }; 
     searchView.setOnQueryTextListener(textChangeListener); 


     return super.onCreateOptionsMenu(menu); 
    } 


    static class MyAdapter extends BaseAdapter { 

     static class ViewHolder { 
      TextView station; 
      TextView zone; 
     } 

     LayoutInflater inflater; 
     Victoria[] mVictoria; 

     public MyAdapter(Context contexts, Victoria[] samples) { 
      this.mVictoria = samples; 
      inflater = LayoutInflater.from(contexts); 
     } 

     @Override 
     public int getCount() { 
      return mVictoria.length; 
     } 

     @Override 
     public Object getItem(int position) { 
      return mVictoria[position]; 
     } 

     @Override 
     public long getItemId(int position) { 
      return 0; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      ViewHolder viewHolder; 
      if (convertView == null) { 
       convertView = inflater.inflate(R.layout.list_item_dualline, null); 
       viewHolder = new ViewHolder(); 

       viewHolder.station = (TextView) convertView.findViewById(R.id.list_item_station); 
       viewHolder.zone = (TextView) convertView.findViewById(R.id.list_item_zone); 
       convertView.setTag(viewHolder); 
      } else { 
       viewHolder = (ViewHolder) convertView.getTag(); 
      } 
      viewHolder.station.setText(mVictoria[position].station); 
      viewHolder.zone.setText(mVictoria[position].getzone()); 

      return convertView; 
     } 
    } 
} 

Answer 1

你的错误相当多告诉你，你做错了什么：

Cannot resolve symbol 'myAdapter'

钍at是因为您还没有声明任何变量叫myAdapter

error: method setOnQueryTextListener in class SearchView cannot be applied to given types; required: android.support.v7.widget.SearchView.OnQueryTextListener found: android.widget.SearchView.OnQueryTextListener reason: actual argument android.widget.SearchView.OnQueryTextListener cannot be converted to android.support.v7.widget.SearchView.OnQueryTextListener by method invocation conversion

检查您的导入。您需要使用android.support.v7.widget.SearchView，但您使用的是标准SearchView。这应该通过简单地导入正确的软件包来解决。

编辑：

您使用了错误类型的OnQueryListener您需要使用支持版本。

编辑2： 希望这会帮助你开始：

public class FragmentVictoriaLine extends Fragment { 
    /**Declare other variables**/ 

    private MyAdapter myAdapter; 

    public FragmentVictoriaLine() { 
     // Required empty public constructor 
    } 


    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.fragment_victoria_line, container, false); 

     //Tell the system to call onCreateOptinsMenu 
     setHasOptionsMenu(true); 
     if (getActivity().findViewById(R.id.detail_container) != null) { 
      mTwoPane = true; 
     } else { 
      mTwoPane = false; 
     } 

     mVictoria = new Victoria[]{ 
      new Victoria(R.string.bank, R.string.zone_1, WCBankActivity.class, FragmentWCBank.class), 
      new Victoria(R.string.wat, R.string.zone_1, WCWATActivity.class, FragmentWCWAT.class) 
     }; 

     //Declare your adapter here so you can access later 
     myAdapter = new MyAdapter(getActivity(), mVictoria); 

     final ListView listView = (ListView) v.findViewById(R.id.list_victoria); 
     //Set teh adapter here. 
     listView.setAdapter(myAdapter); 
     listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 
     listView.setTextFilterEnabled(true); 

     return v; 
    } 

    @Override 
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
     // Inflate the menu items for use in the action bar 
     inflater.inflate(R.menu.menu_victoria_line, menu); 

     // Associate searchable configuration with the SearchView 
     SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE); 
     SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView(); 
     searchView.setSearchableInfo(searchManager.getSearchableInfo(getActivity().getComponentName())); 
     searchView.setIconifiedByDefault(false); 

     SearchView.OnQueryTextListener textChangeListener = new SearchView.OnQueryTextListener() 
     { 
      @Override 
      public boolean onQueryTextChange(String newText) 
      { 
       // this is your adapter that will be filtered 
       myAdapter.getFilter().filter(newText); 
       System.out.println("on text chnge text: "+newText); 
       return true; 
      } 
      @Override 
      public boolean onQueryTextSubmit(String query) 
      { 
       // this is your adapter that will be filtered 
       myAdapter.getFilter().filter(query); 
       System.out.println("on query submit: "+query); 
       return true; 
      } 
     }; 
     searchView.setOnQueryTextListener(textChangeListener); 

    } 

    /**....rest of your code*/ 
} 

编辑3：

以下是完整的演示： https://github.com/nak411/AndroidFilterListDemo