Как фильтровать по списку

Question

Я хотел был бы фильтровать в listview на основе Spinner.

Например, у меня есть код для ListView, который

("Singapore Discovery Centre", 
"Singapore Science Centre", 
"Mint Museum", 
"Singapore Art Museum", 
"Army Museum"). 

Я код для Spinner, который

("Centre", 
"Singapore", 
"Museum"). 

То, что я хотел бы иметь это: После нажатия Сингапур в ListView, он будет отфильтровывать все «Сингапур»

("Singapore Discovery Centre", 
"Singapore Science Centre", 
"Singapore Art Museum"). 

Я попробовал эту кодировку мой,

Не могли бы вы руководить мной, что с ним не так?

MainActivity.java

public abstract class MainActivity extends ListActivity implements OnItemSelectedListener { 

    String[] Category = { 
    "Singapore discovery Centre", 
    "Singapore Science Centre", 
    "Mint Museum", 
    "Singapore Art Museum", 
    "Army Museum" 
}; 

String [] keywords = { 
    "Centre", 
    "Musuem", 
    "Singapore", 

}; 

Spinner s1; 
ListView listview; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     listview = (ListView) findViewById(R.id.listView1); 
     s1 = (Spinner) findViewById(R.id.spinner1); 

     s1.setOnItemSelectedListener(this); 

       setListAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,Category)); 

       ArrayAdapter<String> aa = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, keywords); 

       aa.setDropDownViewResource(
          android.R.layout.simple_spinner_dropdown_item); 
         s1.setAdapter(aa); 
        } 

    public void onItemSelected(AdapterView<?> parent, View v, int position, 
      long id) { 
     listview.setFilterText(Category[position]); 
    } 


    public void onNothingSelected(AdapterView<?> parent) { 
     listview.setFilterText(""); 
    } 

public void onListItemClick(ListView parent, View v, int position,long id) 
     { 
      Toast.makeText(this, "You have selected " + Category[position], Toast.LENGTH_SHORT).show(); 
     } 
     } 

Logcat:

07-29 14:43:30.429: E/AndroidRuntime(30599): FATAL EXCEPTION: main 
    07-29 14:43:30.429: E/AndroidRuntime(30599): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.spinnertest/com.example.spinnertest.MainActivity}: java.lang.InstantiationException: com.example.spinnertest.MainActivity 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.os.Handler.dispatchMessage(Handler.java:99) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.os.Looper.loop(Looper.java:130) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.app.ActivityThread.main(ActivityThread.java:3691) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at java.lang.reflect.Method.invokeNative(Native Method) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at java.lang.reflect.Method.invoke(Method.java:507) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:670) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at dalvik.system.NativeStart.main(Native Method) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): Caused by: java.lang.InstantiationException: com.example.spinnertest.MainActivity 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at java.lang.Class.newInstanceImpl(Native Method) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at java.lang.Class.newInstance(Class.java:1409) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.app.Instrumentation.newActivity(Instrumentation.java:1024) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565) 
    07-29 14:43:30.429: E/AndroidRuntime(30599): ... 11 more 

Answer 1

Вам придется использовать пользовательский адаптер и пользовательский фильтр.

Удалить класс abstract.

row.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="19dp" 
     android:text="TextView" /> 

</RelativeLayout> 

MainActivity.java

public class MainActivity extends ListActivity implements 
     OnItemSelectedListener { 

    String[] Category = { "Singapore discovery Centre", 
      "Singapore Science Centre", "Mint Museum", "Singapore Art Museum", 
      "Army Museum" }; 

    String[] keywords = { "Centre", "Museum", "Singapore", 

    }; 
    ArrayList<String> cat = new ArrayList<String>(); 
    ArrayList<String> mPostingData = new ArrayList<String>(); 
    Spinner s1; 
    ListView listview; 
    CustomAdapter cus; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     listview = (ListView) findViewById(R.id.listView1); 
     s1 = (Spinner) findViewById(R.id.spinner1); 
     for (int i = 0; i < Category.length; i++) { 
      cat.add(Category[i]); 
     } 

     // aa = new 
     // ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,Category); 
     s1.setOnItemSelectedListener(this); 
     mPostingData = cat; 
     for (int i = 0; i < mPostingData.size(); i++) { 
      if (mPostingData.size() > 0) 
       Log.i("Datas", mPostingData.get(i)); 
     } 
     cus = new CustomAdapter(this, 0); 
     setListAdapter(cus); 

     ArrayAdapter<String> aa = new ArrayAdapter<String>(this, 
       android.R.layout.simple_spinner_item, keywords); 

     aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     s1.setAdapter(aa); 
    } 

    public void onItemSelected(AdapterView<?> parent, View v, int position, 
      long id) { 
     // listview.setFilterText(Category[position]); 
     String Text = s1.getSelectedItem().toString(); 
     cus.getFilter().filter(Text); 
     cus.notifyDataSetChanged(); 
    } 

    public void onNothingSelected(AdapterView<?> parent) { 
     // listview.setFilterText(""); 
    } 

    public void onListItemClick(ListView parent, View v, int position, long id) { 
     Toast.makeText(this, "You have selected " + mPostingData.get(position), 
       Toast.LENGTH_SHORT).show(); 
    } 

    class CustomAdapter extends ArrayAdapter<String> { 

     public void setData(ArrayList<String> mPpst) { 
      mPostingData = mPpst;// contains class items data. 
     } 

     @Override 
     public Filter getFilter() { 
      return new Filter() { 
       @Override 
       protected void publishResults(CharSequence constraint, 
         FilterResults results) { 
        if (results != null && results.count >= 0) { 
         setData((ArrayList<String>) results.values); 
        } else { 
         setData(cat);// set original values 
        } 

        notifyDataSetInvalidated(); 
       } 

       @Override 
       protected FilterResults performFiltering(CharSequence constraint) { 
        FilterResults result = new FilterResults(); 
        if (!TextUtils.isEmpty(constraint)) { 
         constraint = constraint.toString(); 
         ArrayList<String> foundItems = new ArrayList<String>(); 
         if (cat != null) { 
          for (int i = 0; i < cat.size(); i++) { 

           if (cat.get(i).contains(constraint)) { 
            System.out.println("My datas" + cat.get(i)); 
            foundItems.add(cat.get(i)); 

           } else { 

           } 
          } 
         } 
         result.count = foundItems.size();// search results found 
                  // return count 
         result.values = foundItems;// return values 
        } else { 
         result.count = -1;// no search results found 
        } 

        return result; 
       } 
      }; 
     } 

     LayoutInflater mInflater; 

     public CustomAdapter(Context context, int textViewResourceId) { 
      super(context, textViewResourceId); 
      // TODO Auto-generated constructor stub 
      mInflater = (LayoutInflater) context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     } 

     @Override 
     public int getCount() { 
      // TODO Auto-generated method stub 
      return mPostingData.size(); 
     } 

     @Override 
     public long getItemId(int position) { 
      // TODO Auto-generated method stub 
      return position; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      // TODO Auto-generated method stub 
      ViewHolder vh; 
      if (convertView == null) { 
       vh = new ViewHolder(); 
       convertView = mInflater.inflate(R.layout.row, null); 
       vh.t1 = (TextView) convertView.findViewById(R.id.textView1); 

       convertView.setTag(vh); 
      } else { 
       // Get the ViewHolder back to get fast access to the TextView 
       // and the ImageView. 
       vh = (ViewHolder) convertView.getTag(); 
      } 
      if (mPostingData.size() > 0) 
       vh.t1.setText(mPostingData.get(position)); 
      return convertView; 
     } 

    } 

    static class ViewHolder { 
     TextView t1; 
    } 
} 

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