如何按listview过滤

时间：2013-07-29 06:45:56

标签： listview filter spinner

我想根据Spinner过滤到listview。

例如，我有一个ListView的代码

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

我有一个Spinner的代码

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

我想要的是：点击新加坡后，在列表视图中，它会过滤掉所有“新加坡”

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

我尝试了我的编码，

你可以指导我，它有什么问题吗？

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的：

  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

1 个答案:

答案 0 :(得分：2)

您必须使用自定义适配器和自定义过滤器。

为您上课删除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;
    }
}

模拟器快照

enter image description here

enter image description here

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