Я хотел бы отфильтровать в просмотр списка на основе Spinner.

Например, яVe код для ListView, который я

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

VE код для Spinner, который является

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

То, что я хотел бы иметь: После нажатия на Сингапур, в списке, он отфильтрует все "Сингапур"

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

Я опробовал это мое кодирование,

Не могли бы вы навести меня, 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(this,android.R.layout.simple_list_item_1,Category)); 

                ArrayAdapter aa = new ArrayAdapter(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