search function in android for getting data in mysql
<p>i want to add a search Function.I have seen the tutorial. I try to add the code but still have error.Maybe,I don't understand Adapter.
   public class orderActivity extends ListActivity{</p>

<pre><code>// Progress Dialog
private ProgressDialog pDialog;

// Creating JSON Parser object
JSONParser jParser = new JSONParser();

ArrayList&lt;HashMap&lt;String, String&gt;&gt; ordersList;

EditText inputsearch;
 // List view
 private ListView bb;
// Listview Adapter
 ArrayAdapter&lt;String&gt; adapter;




public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.all_order);  


 // getting product details from intent
    Intent i = getIntent();

 // getting product id (pid) from intent
    username = i.getStringExtra(KEY_NAME);

 // Hashmap for ListView

    ordersList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;();

    // Loading orders in Background Thread
    new LoadAllOrders().execute();

    // Get listview
    ListView lv = getListView();

    // on seleting single product
    // launching Edit Product Screen
    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView&lt;?&gt; parent, View view,
                int position, long id) {
            // getting values from selected ListItem
            String oid = ((TextView) view.findViewById(R.id.name)).getText()
                    .toString();
                // Starting new intent
                Intent in = new Intent(getApplicationContext(),
                        orderdetailActivity.class);
                // sending pid to next activity
                in.putExtra(KEY_ID, oid);

                // starting new activity and expecting some response back
                startActivityForResult(in, 100);
            }
    });

    //the search function part!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    bb = (ListView) findViewById(android.R.id.list);
     inputsearch = (EditText) findViewById(R.id.inputsearch);
     bb.setAdapter(adapter);


    /**
     * Enabling Search Filter
     * */
    inputsearch.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
            // When user changed the Text
            orderActivity.this.adapter.getFilter().filter(cs);
        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub
        }
    });

}


    /**
     * getting All orders from url
     * */
    protected String doInBackground(String... args) {
        // updating UI from Background Thread
        runOnUiThread(new Runnable() {
            public void run() {


        try {
            // Building Parameters
            List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;();
            params.add(new BasicNameValuePair("username", username));
            // getting JSON string from URL
            JSONObject json = jParser.makeHttpRequest(url_orders, "GET", params);

            // Check your log cat for JSON reponse
            Log.d("All Orders: ", json.toString());

            // Checking for SUCCESS TAG
            int success = json.getInt(KEY_SUCCESS);

            if (success == 1) {
                // orders found
                // Getting Array of orders
                orders = json.getJSONArray(KEY_ORDERS);

                // looping through All Orders
                for (int i = 0; i &lt; orders.length(); i++) {
                    JSONObject c = orders.getJSONObject(i);

                    // Storing each json item in variable
                    String id = c.getString(KEY_ID);
                    String name = c.getString(KEY_USERNAME);

                    // creating new HashMap
                    HashMap&lt;String, String&gt; map = new    HashMap&lt;String, String&gt;();

                    // adding each child node to HashMap key =&gt; value
                    map.put(KEY_ID, id);
                    map.put(KEY_USERNAME, name);

                    // adding HashList to ArrayList
                    ordersList.add(map);
                }
            } else {
                // no orders found
                // Launch Add New product Activity
                Intent i = new Intent(getApplicationContext(),
                        orderActivity.class);       //  no ensure to need change
                // Closing all previous activities
                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(i);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

            }
        });

        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog after getting all orders
        pDialog.dismiss();
        // updating UI from Background Thread
        runOnUiThread(new Runnable() {
            public void run() {
                /**
                 * Updating parsed JSON data into ListView
                 * */
                ListAdapter adapter = new SimpleAdapter(
                        orderActivity.this, ordersList,
                        R.layout.all_list, new String[] { KEY_USERNAME,
                                KEY_ID},
                        new int[] { R.id.oid, R.id.name });
                // updating listview
                setListAdapter(adapter);
            }
        });

    }

}
</code></pre>

<p>}</p>

<p>there is the layout.</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" &gt;

&lt;!-- Product id (pid) - will be HIDDEN - used to pass to other activity --&gt;
&lt;TextView
    android:id="@+id/oid"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:visibility="gone" /&gt;

&lt;!-- Name Label --&gt;
&lt;TextView
    android:id="@+id/name"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:paddingTop="6dip"
    android:paddingLeft="6dip"
    android:textSize="17dip"
    android:textStyle="bold" /&gt;

&lt;/LinearLayout&gt;
</code></pre>

<p>there is the other layout
    
    </p>

<pre><code> &lt;TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="10dip"
        android:text="Please enter the order number:"
        android:textSize="20dp" /&gt;
 &lt;EditText
        android:id="@+id/inputsearch"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:hint="Search orders.."
        android:inputType="textVisiblePassword"
        android:ems="10" /&gt;
&lt;!--  Always give id value as list(@android:id/list)   --&gt;
&lt;ListView
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/&gt;

&lt;/LinearLayout&gt;
</code></pre>

<p>that is my log</p>

<pre><code>03-12 09:52:00.252: W/dalvikvm(295): threadid=1: thread exiting with uncaught exception    (group=0x4001d800)
03-12 09:52:00.261: E/AndroidRuntime(295): FATAL EXCEPTION: main
03-12 09:52:00.261: E/AndroidRuntime(295): java.lang.NullPointerException
03-12 09:52:00.261: E/AndroidRuntime(295):  at   com.example.androidhive.orderActivity$2.onTextChanged(orderActivity.java:125)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.widget.TextView.handleTextChanged(TextView.java:6172)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:6316)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.text.SpannableStringBuilder.sendTextChange(SpannableStringBuilder.java:889)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:352)
03-12 09:52:00.261: E/AndroidRuntime(295):  at   android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:269)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:432)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:409)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:28)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:583)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.view.inputmethod.BaseInputConnection.commitText(BaseInputConnection.java:174)
03-12 09:52:00.261: E/AndroidRuntime(295):  at com.android.internal.widget.EditableInputConnection.commitText(EditableInputConnection.java:120)
03-12 09:52:00.261: E/AndroidRuntime(295):  at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:247)
03-12 09:52:00.261: E/AndroidRuntime(295):  at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:73)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.os.Handler.dispatchMessage(Handler.java:99)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.os.Looper.loop(Looper.java:123)
03-12 09:52:00.261: E/AndroidRuntime(295):  at android.app.ActivityThread.main(ActivityThread.java:4627)
03-12 09:52:00.261: E/AndroidRuntime(295):  at java.lang.reflect.Method.invokeNative(Native Method)
03-12 09:52:00.261: E/AndroidRuntime(295):  at java.lang.reflect.Method.invoke(Method.java:521)
03-12 09:52:00.261: E/AndroidRuntime(295):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-12 09:52:00.261: E/AndroidRuntime(295):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-12 09:52:00.261: E/AndroidRuntime(295):  at dalvik.system.NativeStart.main(Native   Method)
03-12 09:52:02.294: I/Process(295): Sending signal. PID: 295 SIG: 9
</code></pre>
