I am new to android and want to parse json data in a listview and then add search functionally to it, but I don't know how to add search.
The Java class is:
public class AndroidJSONParsingActivity extends ListActivity {
// url to make request
private static String url = "http://10.0.2.2/quick/punk.php";
// JSON Node names
private static final String TAG_CUSTOMER = "Customer";
private static final String TAG_CUSTOMER_CODE = "customer_code";
private static final String TAG_CUSTOMER_NAME = "customer_name";
private static final String TAG_CUSTOMER_MOBILE = "customer_mobile";
private static final String TAG_CUSTOMER_ADDRESS = "customer_address";
// contacts JSONArray
JSONArray Customer = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// Getting Array of Contacts
Customer = json.getJSONArray(TAG_CUSTOMER);
// looping through All Contacts
for(int i = 0; i < Customer.length(); i++){
JSONObject c = Customer.getJSONObject(i);
// Storing each json item in variable
String customer_code = c.getString(TAG_CUSTOMER_CODE);
String customer_name = c.getString(TAG_CUSTOMER_NAME);
String customer_mobile = c.getString(TAG_CUSTOMER_MOBILE);
String customer_address = c.getString(TAG_CUSTOMER_ADDRESS);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_CUSTOMER_CODE, customer_code);
map.put(TAG_CUSTOMER_NAME, customer_name);
map.put(TAG_CUSTOMER_MOBILE, customer_mobile);
map.put(TAG_CUSTOMER_ADDRESS, customer_address);
// adding HashList to ArrayList
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(this, contactList,
R.layout.list_item,
new String[] { TAG_CUSTOMER_CODE, TAG_CUSTOMER_NAME,TAG_CUSTOMER_MOBILE,TAG_CUSTOMER_ADDRESS}, new int[] {
R.id.code, R.id.name,R.id.mobile,R.id.address});
setListAdapter(adapter);
}
}
The xml file is:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<EditText
android:id="@+id/search"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<!-- Main ListView
Always give id value as list(@android:id/list)
-->
<Button
android:id="@+id/button1"
android:layout_width="50dip"
android:layout_height="wrap_content"
android:text="+" />
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
What I want is that when a user types something in the textbox, it should be searched in the data that is there in the list. Can any one tell me how to implement it?
Raghunandan
Use a Custom List adapter to display items in listview. Display a editText on the top. For custom Listview http://www.androidhive.info/2012/02/android-custom-listview-with-image-and-text/.
For searching listview. How can I filter ListView data when typing on EditText in android.
For custom search implement search on a custom listview. I suggest you to go with search on custom listview with filters.
Edit
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<EditText
android:id="@+id/search"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
MainActivity Class
public class MainActivity extends Activity {
ArrayList<NewData> mTemp=new ArrayList<NewData>();
ArrayList<NewData> mPostingData=new ArrayList<NewData>();
ArrayList< NewData> mOri = new ArrayList<NewData>();
Myadapter ma;
EditText search;
NewData nd;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
for(int i = 0; i < 20; i++)
{
// Add your Json Parsed Data here
// each item from json add it to hash map in NewData class. Arraylist of 0 contains jsondata of customer1
nd=new NewData();
nd.newDatacus.put(NewData.TAG_CUSTOMER_CODE, "i"+i);
nd.newDatacus.put(NewData.TAG_CUSTOMER_NAME, "a"+i);
nd.newDatacus.put(NewData.TAG_CUSTOMER_MOBILE, "number");
nd.newDatacus.put(NewData.TAG_CUSTOMER_ADDRESS, "address");
mOri.add(nd);
}
ma= new Myadapter(MainActivity.this);
mPostingData=mOri;
mTemp=mOri;
ListView lv= (ListView) findViewById(R.id.list);
lv.setAdapter(ma);
search= (EditText) findViewById(R.id.search);
search.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
ma.getFilter().filter(s);
ma.notifyDataSetChanged();
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void afterTextChanged(Editable s) {
}
});
}
class Myadapter extends ArrayAdapter
{
LayoutInflater mInflater;
public void setData(ArrayList<NewData> 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<NewData>) results.values);//if results of search is null set the searched results data
} else {
setData(mOri);// set original values
}
notifyDataSetInvalidated();
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults result = new FilterResults();
if (!TextUtils.isEmpty(constraint)) {
constraint = constraint.toString().toLowerCase();
ArrayList<NewData> foundItems = new ArrayList<NewData>();
if(mTemp!=null)
{
for(int i=0;i<mTemp.size();i++)
{
if (mTemp.get(i).newDatacus.get(NewData.TAG_CUSTOMER_CODE).toString().contains(constraint)) {
System.out.println("My datas"+mTemp.get(i).newDatacus.get(NewData.TAG_CUSTOMER_CODE).toString());
foundItems.add(mTemp.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;
}
};
}
public Myadapter(Context context) {
super(context, 0);
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// TODO Auto-generated constructor stub
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mPostingData.size();
}
@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 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if(mOri == null ){
return null;
}
// When convertView is not null, we can reuse it directly, there is no need
// to reinflate it. We only inflate a new View when the convertView supplied
// by ListView is null.
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list, null);
convertView.setLayoutParams(new AbsListView.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
// Creates a ViewHolder and store references to the two children views
// we want to bind data to.
holder = new ViewHolder();
holder.t1=(TextView) convertView.findViewById(R.id.textView1);
holder.t2 = (TextView) convertView.findViewById(R.id.textView2);
holder.t3 = (TextView) convertView.findViewById(R.id.textView3);
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
holder.t1.setText(mPostingData.get(position).newDatacus.get(NewData.TAG_CUSTOMER_CODE).toString());
holder.t2.setText(mPostingData.get(position).newDatacus.get(NewData.TAG_CUSTOMER_NAME).toString());
holder.t3.setText(mPostingData.get(position).newDatacus.get(NewData.TAG_CUSTOMER_MOBILE).toString());
return convertView;
}
}
class ViewHolder
{
TextView t1,t2,t3;
}
}
list.xml to be inflated in custom list adapter
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="20dp"
android:text="TextView" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="20dp"
android:text="TextView" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="20dp"
android:text="TextView" />
</LinearLayout>
NewData Class- Holds all data in hashmap
public class NewData {
public static final String TAG_CUSTOMER_CODE = "customer_code";
public static final String TAG_CUSTOMER_NAME = "customer_name";
public static final String TAG_CUSTOMER_MOBILE = "customer_mobile";
public static final String TAG_CUSTOMER_ADDRESS = "customer_address";
Hashtable newDatacus=new Hashtable();
public NewData()
{
newDatacus.put(NewData.TAG_CUSTOMER_CODE,new String());
newDatacus.put(NewData.TAG_CUSTOMER_ADDRESS,new String());
newDatacus.put(NewData.TAG_CUSTOMER_NAME,new String());
newDatacus.put(NewData.TAG_CUSTOMER_MOBILE,new String());
newDatacus.put(NewData.TAG_CUSTOMER_ADDRESS,new String());
}
}
Modify so that you add your json data in the for loop. I have made search criteria here customer id. You can change this according to your needs. This code is tested and it works. Hope someone can give a better code. Hope this helps you.
来源：https://stackoverflow.com/questions/15109406/how-to-set-json-parsed-data-in-a-listview-and-then-adding-search-functionality-i