用于过滤自定义列表视图元素的搜索过滤器答案

【问题标题】：Search filter for filtering custom listview elements用于过滤自定义列表视图元素的搜索过滤器
【发布时间】：2013-12-24 06:40:40
【问题描述】：

我做了什么 ::

我可以通过JSON从webservice实现显示数据并将其填充到listview
我已经实现search-filter 来根据文本搜索元素查看

我有什么问题:: 我会发布一系列快照来解释我的问题

Snapshot1 :: 我有listview 显示列表中的一系列元素

Snapshot2:: 现在当我输入carl 时，我的名字会被过滤，只显示匹配的结果

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

总体:: 发生的事情是过滤后我无法再次尝试使用它...我必须再次重新编译整个项目

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();
        }
    }
}

关于解决此问题的任何想法，谢谢

【问题讨论】：

您只需要使用您第一次解析的项目清除当前的数组列表。
@ Salman Khan ... @ user370305 .... 你能指导我回答编辑我的代码吗...我是新手
使用before 和count 参数的onTextChanged() 方法。获取以前的列表。
smriti 你的问题解决了吗？
@Dipali .... 解决了！ :)

标签： java android android-listview android-filter

【解决方案1】：

只需设置搜索字符串长度的条件。

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);
            }
         }
        });

【讨论】：

【解决方案2】：

它发生是因为您过滤了一个空字符串，例如searchString.equalsIgnoreCase("")。您可以轻松地在代码中修复它。但是，我建议您宁愿在自定义数组适配器中实现可过滤接口。 http://developer.android.com/reference/android/widget/Filterable.html 查看 ArrayAdapter 源代码以获取有关如何执行此操作的示例： https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/android/widget/ArrayAdapter.java

【讨论】：

【解决方案3】：

在文本更改侦听器上使用本地值设置适配器：-

@Override
                    public void onTextChanged(CharSequence s, int start, int before, int count) {
                        // TODO Auto-generated method stub

                        ArrayList<String> STOREID_SUB = new ArrayList<String>();
                        ArrayList<String> STORE_NAME_SUB = new ArrayList<String>();
                        ArrayList<String> PHOTO_SUB = new ArrayList<String>();
                        final ArrayList<String> STORE_DESC_SUB = new ArrayList<String>();

                        textlength = searchText.getText().length();

                        for (int i = 0; i < STORE_NAME.size(); i++)
                        {
                            if (textlength <= STORE_NAME.get(i).length())
                            {
                                if (searchText.getText().toString().
                                        equalsIgnoreCase((String) STORE_NAME.get(i).subSequence(0, textlength)))
                                {
                                    STORE_NAME_SUB.add(STORE_NAME.get(i));
                                    STOREID_SUB.add(STOREID.get(i));
                                    PHOTO_SUB.add(PHOTO.get(i));
                                    STORE_DESC_SUB.add(STORE_DESC.get(i));  


                                }
                            }
                        }

                        adapter=new StoreSearchListAdapter(context, R.drawable.ic_launcher, R.drawable.ic_launcher, STORE_NAME_SUB, PHOTO_SUB,STORE_DESC_SUB);
                        singlePlaceChooserList.setAdapter(adapter);             

                    }

【讨论】：

对帖子进行投票是本网站的主要功能之一。它不需要是提出问题的人或主持人（像我一样）。此外，当人们解释他们的投票时，至少考虑他们所说的内容是个好主意。最后，要求你要有礼貌。

【解决方案4】：

试试下面的代码

 if(arraryTemplist.size()>0){
      adapter = new ListViewAdapter(ListOfContacts.this, arrayTemplist);
                    listview.setAdapter(adapter);
  }else{

     adapter = new ListViewAdapter(ListOfContacts.this, arraylist);
                    listview.setAdapter(adapter);
}

【讨论】：