java - 用于过滤自定义 ListView 元素的搜索过滤器

Question

我做了什么::

• 我能够通过 webservice 中的 JSON 实现数据显示并将其填充到 listview
• 我已经实现了 search-filter 来根据文本搜索元素查看

我遇到的问题::我将发布一系列快照来解释我的问题

<小时/>

1. Snapshot1::我有 listview 显示列表中的一系列元素

Snapshot2::现在，当我输入 carl 时，我的姓名会被过滤，并且仅显示匹配的结果

Snapshot3::现在删除搜索栏中的所有内容 ..... 我应该得到如 snapshot1 中所示的显示，但没有发生

总体::发生的情况是，一旦过滤，我就无法再使用它进行另一次尝试...我必须再次重新编译整个项目

<小时/>

ListOfContacts.java

public class ListOfContacts extends Activity {
    // Declare Variables
    JSONObject jsonobject;
    JSONArray jsonarray;
    ListView listview;
    ListViewAdapter adapter;
    ProgressDialog mProgressDialog;
    ArrayList<HashMap<String, String>> arraylist;
    static String NAME = "rank";
    static String FLAG = "flag";
    EditText mEditText;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Get the view from listview_main.xml
        setContentView(R.layout.listview_main);


        // Locate the listview in listview_main.xml
        listview = (ListView) findViewById(R.id.listview);
        mEditText = (EditText) findViewById(R.id.inputSearch);
        // Execute DownloadJSON AsyncTask
        new DownloadJSON().execute();


    }

    // DownloadJSON AsyncTask
    class DownloadJSON extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Create a progressdialog
            mProgressDialog = new ProgressDialog(ListOfContacts.this);
            // Set progressdialog title
            //mProgressDialog.setTitle("Fetching the information");
            // Set progressdialog message
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            // Show progressdialog
            mProgressDialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            // Create an array
            arraylist = new ArrayList<HashMap<String, String>>();
            // Retrieve JSON Objects from the given URL address
            jsonobject = JSONfunctions.getJSONfromURL("http://URL");

            try {
                // Locate the array name in JSON
                jsonarray = jsonobject.getJSONArray("restaurants");

                for (int i = 0; i < jsonarray.length(); i++) {
                    HashMap<String, String> map = new HashMap<String, String>();
                    jsonobject = jsonarray.getJSONObject(i);
                    // Retrive JSON Objects
                    map.put(ListOfContacts.NAME, jsonobject.getString("Person_Name"));
                    map.put(ListOfContacts.FLAG, "http://54.218.73.244:7004/"+jsonobject.getString("Image_Name"));



                    // Set the JSON Objects into the array
                    arraylist.add(map);
                }
            } catch (JSONException e) {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void args) {
            // Pass the results into ListViewAdapter.java
            adapter = new ListViewAdapter(ListOfContacts.this, arraylist);
            // Set the adapter to the ListView
            listview.setAdapter(adapter);
            // Close the progressdialog

            mEditText = (EditText) findViewById(R.id.inputSearch);
            mEditText.addTextChangedListener(new TextWatcher()
            {

                public void afterTextChanged(Editable s)
                {

                }

                public void beforeTextChanged(CharSequence s, int start,int count, int after)
                {

                }

                public void onTextChanged(CharSequence s, int start,int before, int count)
                {

                    ArrayList<HashMap<String, String>> arrayTemplist= new ArrayList<HashMap<String,String>>();
                    String searchString =mEditText.getText().toString();
                    for (int i = 0; i < arraylist.size(); i++)
                    {
                        String currentString =arraylist.get(i).get(ListOfContacts.NAME);
                        if (searchString.equalsIgnoreCase(currentString))
                        {
                            arrayTemplist.add(arraylist.get(i));
                        }
                    }
                    adapter = new ListViewAdapter(ListOfContacts.this, arrayTemplist);
                    listview.setAdapter(adapter);
                 }
                });
            mProgressDialog.dismiss();
        }
    }
}

DataAcceptActivity.java

public class DataAcceptActivity extends Activity {

    Button submit;
    Button display;
    ProgressDialog pDialog;
    InputStream is;
    EditText name;
    ImageView imageView;
    EditText search;

    private static final int SELECT_PICTURE = 1;
    private String selectedImagePath;

    int[] image_array={R.drawable.index,R.drawable.image1,R.drawable.image5,R.drawable.image6,R.drawable.image7,R.drawable.image8,R.drawable.image9,R.drawable.image10};

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

        submit = (Button) findViewById(R.id.SUBMIT_BUTTON_ID);
        name = (EditText) findViewById(R.id.editText1);
        imageView = (ImageView) findViewById(R.id.imageView1);
        display=(Button) findViewById(R.id.DISPLAY_BUTTON_ID);

        search=(EditText) findViewById(R.id.inputSearch);

        display.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent searchIntent=new Intent(DataAcceptActivity.this,ListOfContacts.class);
                startActivity(searchIntent);

            }
        });


        submit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                new MainTest().execute();


            }
        });


        imageView.setOnClickListener(new  OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub

                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_PICTURE);
            }
        });




    }


    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);
                System.out.println("Image Path : " + selectedImagePath);
                imageView.setImageURI(selectedImageUri);
            }
        }
    }

    public String getPath(Uri uri) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }



    /**
     * Method to post the image to the server.
     * U will have to change the url which will accept the image data.
     * @throws IOException 
     */
    public void postImageData() {


        try
        {

            Bitmap bitmapOrg = ((BitmapDrawable)imageView.getDrawable()).getBitmap();

            HttpClient httpClient = new DefaultHttpClient();
            HttpPost postRequest = new HttpPost("http://URL");
            MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
            try{
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                bitmapOrg.compress(CompressFormat.JPEG, 75, bos);
                byte[] data = bos.toByteArray();
                ByteArrayBody bab = new ByteArrayBody(data, "image.jpg");
                reqEntity.addPart("key", bab);
                reqEntity.addPart("key1", new StringBody(name.getText().toString()));
            }
            catch(Exception e){
                //Log.v("Exception in Image", ""+e);
                reqEntity.addPart("picture", new StringBody(""));
            }
            postRequest.setEntity(reqEntity);       
            HttpResponse response = httpClient.execute(postRequest);
            BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
            String sResponse;
            StringBuilder s = new StringBuilder();
            while ((sResponse = reader.readLine()) != null) {
                s = s.append(sResponse);
            }
        }catch(Exception e){
            e.getStackTrace();
        }


    }
    public class MainTest extends AsyncTask<String, Integer, String> {

        @Override
        protected void onPreExecute() {
            pDialog = new ProgressDialog(DataAcceptActivity.this);
            pDialog.setMessage("Loading..");
            pDialog.setIndeterminate(true);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... params) {

            postImageData();

            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            // TODO Auto-generated method stub

            super.onPostExecute(result);
            // data=jobj.toString();
            pDialog.dismiss();
            Toast.makeText(getApplicationContext(), "File Uploaded", Toast.LENGTH_SHORT).show();
        }

    }


    class ImageAdapter extends BaseAdapter{

        Context cxt;
        public ImageAdapter(DataAcceptActivity dataAcceptActivity) {
            // TODO Auto-generated constructor stub
            this.cxt=dataAcceptActivity;
        }

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

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

        @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

            ImageView imageView ;
            if(convertView==null){
                imageView=new ImageView(cxt);
                imageView.setLayoutParams(new GridView.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(15, 15, 15, 15);
            }else{
                imageView=(ImageView) convertView;
            }

            imageView.setImageResource(image_array[position]);
            return imageView;
        }

    }

}

MainActivity.java

public class MainActivity extends Activity {
    // Declare Variables
    JSONObject jsonobject;
    JSONArray jsonarray;
    ListView listview;
    ListViewAdapter adapter;
    ProgressDialog mProgressDialog;
    ArrayList<HashMap<String, String>> arraylist;

    static String NAME = "rank";
    static String FLAG = "flag";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Get the view from listview_main.xml
        setContentView(R.layout.listview_main);


        // Locate the listview in listview_main.xml
        listview = (ListView) findViewById(R.id.listview);

        // Execute DownloadJSON AsyncTask
        new DownloadJSON().execute();
    }

    // DownloadJSON AsyncTask
    private class DownloadJSON extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Create a progressdialog
            mProgressDialog = new ProgressDialog(MainActivity.this);
            // Set progressdialog title
            //mProgressDialog.setTitle("Fetching the information");
            // Set progressdialog message
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            // Show progressdialog
            mProgressDialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            // Create an array
            arraylist = new ArrayList<HashMap<String, String>>();
            // Retrieve JSON Objects from the given URL address
            jsonobject = JSONfunctions.getJSONfromURL("http://URL");

            try {
                // Locate the array name in JSON
                jsonarray = jsonobject.getJSONArray("restaurants");

                for (int i = 0; i < jsonarray.length(); i++) {
                    HashMap<String, String> map = new HashMap<String, String>();
                    jsonobject = jsonarray.getJSONObject(i);
                    // Retrive JSON Objects
                    map.put(MainActivity.NAME, jsonobject.getString("restaurantNAME"));;
                    map.put(MainActivity.FLAG, "http://url"+jsonobject.getString("restaurantIMAGE"));


                    // Set the JSON Objects into the array
                    arraylist.add(map);
                }
            } catch (JSONException e) {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void args) {
            // Pass the results into ListViewAdapter.java
            adapter = new ListViewAdapter(MainActivity.this, arraylist);
            // Set the adapter to the ListView
            listview.setAdapter(adapter);
            // Close the progressdialog
            mProgressDialog.dismiss();
        }
    }
}

<小时/>

任何解决此问题的想法，谢谢

Answer 1

只需输入搜索字符串长度的条件即可。

mEditText.addTextChangedListener(new TextWatcher()
    {

        public void afterTextChanged(Editable s)
        {

        }

        public void beforeTextChanged(CharSequence s, int start,int count, int after)
        {

        }

        public void onTextChanged(CharSequence s, int start,int before, int count)
        {

            ArrayList<HashMap<String, String>> arrayTemplist= new ArrayList<HashMap<String,String>>();
            String searchString =mEditText.getText().toString().trim();
            if(searchString.length()>0)
            {
                for (int i = 0; i < arraylist.size(); i++)
                {
                    String currentString =arraylist.get(i).get(ListOfContacts.NAME);
                    if (searchString.equalsIgnoreCase(currentString))
                    {
                        arrayTemplist.add(arraylist.get(i));
                    }
                }
                adapter = new ListViewAdapter(ListOfContacts.this, arrayTemplist);
                listview.setAdapter(adapter);
            }
            else
            {
                adapter = new ListViewAdapter(ListOfContacts.this, arraylist);
                listview.setAdapter(adapter);
            }
         }
        });