Showing posts with label Adapter. Show all posts
Showing posts with label Adapter. Show all posts

Android Drag and Drop Item in RecycleView.


1.Create an android application project in Studio


Create an android application project in eclipse. To drag and drop list items in list view, we need a custom list view. So first create a class for custom list view and extend it to ListView super class.

2.OnItemLongClickListener



Set OnItemLongClick listener in adapter view and create a hover cell for the selected item.






holder.rowView.setOnLongClickListener(View.OnLongClickListener {    


mStartDragListener.requestDrag(holder)
    true})

3. activity_main.xml file

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="android.com.androiditemdraganddrop.MainActivity">

    <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/contactsRecycleView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toStartOf="parent">
    </androidx.recyclerview.widget.RecyclerView>

</androidx.constraintlayout.widget.ConstraintLayout>

4. StartDragListener.kt  Interface

package android.com.androiditemdraganddrop

import androidx.recyclerview.widget.RecyclerView

interface StartDragListener {
    fun requestDrag(viewHolder: RecyclerView.ViewHolder)
}

5. MainNavigator.kt Interface

package android.com.androiditemdraganddrop

interface MainNavigator {

    fun onRecentActivityClick(accountName: String)
}

6. ItemMoveCallback.kt

package android.com.androiditemdraganddrop

interface MainNavigator {

    fun onRecentActivityClick(accountName: String)
}

Here is main adapter this adapter is use-full  to drag Item from one position to another position

7. MainAdapter.xml file

package android.com.androiditemdraganddrop

import android.content.Context
import android.graphics.Color
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.item_favorites.view.*
import java.util.*
import kotlin.collections.ArrayList
import kotlin.com.androiditemdraganddrop.R

class MainAdapter(
    private val context: Context,
    private val favoritesList: ArrayList<String>,
    private val mStartDragListener: StartDragListener
) :
    RecyclerView.Adapter<MainAdapter.MyViewHolder>(),
    ItemMoveCallback.ItemTouchHelperContract {

    lateinit var mListener: MainNavigator

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        return MyViewHolder(
            LayoutInflater.from(context).inflate(
                R.layout.item_favorites,
                parent,
                false
            )
        )
    }

    override fun getItemCount(): Int {
        return favoritesList.size
    }

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        holder.accountName?.text = favoritesList.get(position)

        holder.rowView.setOnLongClickListener(View.OnLongClickListener {
            mStartDragListener.requestDrag(holder)
            true
        })

        holder.itemView.setOnClickListener {
            mListener.onRecentActivityClick(favoritesList[position])
        }
    }

    class MyViewHolder(internal var rowView: View) : RecyclerView.ViewHolder(rowView) {
        val accountName = rowView.account_name
        val imgProfilePic = rowView.img_profilePic
    }

    override fun onRowMoved(fromPosition: Int, toPosition: Int) {
        if (fromPosition < toPosition) {
            for (i in fromPosition until toPosition) {
                Collections.swap(favoritesList, i, i + 1)
            }
        } else {
            for (i in fromPosition downTo toPosition + 1) {
                Collections.swap(favoritesList, i, i - 1)
            }
        }
        notifyItemMoved(fromPosition, toPosition)
    }

    override fun onRowSelected(myViewHolder: MyViewHolder) {
        myViewHolder.rowView.setBackgroundColor(Color.WHITE)
    }

    override fun onRowClear(myViewHolder: MyViewHolder) {
        myViewHolder.rowView.setBackgroundColor(Color.WHITE)
    }
}


Here is the  screen shorts.




Finally MainActivity.kt file to send data to adapter 

8.MainActivity.kt file

package android.com.androiditemdraganddrop

import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.activity_main.*
import kotlin.com.androiditemdraganddrop.R

class MainActivity : AppCompatActivity(), StartDragListener, MainNavigator {

    private var mFavoritesAdapter: MainAdapter? = null
    private val mFavoriteList: ArrayList<String> = ArrayList()
    internal var touchHelper: ItemTouchHelper? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mFavoriteList.add("Account 1")
        mFavoriteList.add("Account 2")
        mFavoriteList.add("Account 3")
        mFavoriteList.add("Account 4")
        mFavoriteList.add("Account 5")
        mFavoriteList.add("Account 6")
        mFavoriteList.add("Account 7")
        mFavoriteList.add("Account 8")
        mFavoriteList.add("Account 9")
        mFavoriteList.add("Account 10")

        //Favorites list
        val layoutManager = LinearLayoutManager(this)
        contactsRecycleView!!.layoutManager = (layoutManager)
        mFavoritesAdapter = MainAdapter(this, mFavoriteList, this)

        val callback = ItemMoveCallback(mFavoritesAdapter!!)
        touchHelper = ItemTouchHelper(callback)
        touchHelper!!.attachToRecyclerView(contactsRecycleView)

        contactsRecycleView!!.adapter = mFavoritesAdapter
        mFavoritesAdapter!!.mListener = this
    }

    /*
    * This method used for requesting drag items.
    * */
    override fun requestDrag(viewHolder: RecyclerView.ViewHolder) {
        touchHelper!!.startDrag(viewHolder)
    }

    /*
    * This method used for fetching item details.
    * */
    override fun onRecentActivityClick(accountName: String) {
        Toast.makeText(this, accountName, Toast.LENGTH_LONG).show()

    }
}
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Android Json parsing Example with listview?



The process of parsing JSON in Android is pretty simple, thankfully. We'll be using JSONObject for all the parsing goodness - there are also some other JSON classes, but we'll just go through the basic ones to give you a general idea of how it works.

Activity.Java
public class AndroidJSONParsingActivity extends Activity {
private ProgressDialog dialog;
private String string,id,name,mail;  
private ListView listview;
private ArrayList<SearchParent> arrayParents;
//private ArrayList<String> arrayChildren; 

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dialog = new ProgressDialog(this);
string = "http://api.androidhive.info/contacts/";
 
listview = (ListView) findViewById(R.id.listView);
listview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long id) {
//   Auto-generated method stub
Object  ob = (Object) view.getTag();  
if(ob != null) {
TotalhistoryInfo parent = (TotalhistoryInfo) view.getTag();  
String name = parent.getPage_name();  
String mail = parent.getPage_date();
String ID = parent.getId();
Log.i("details=>", ID + name + mail);  
}
}
});
new uploadaudio().execute();
}
private void ProgressBar_show() {

((ProgressDialog) dialog).setTitle("JsonParsing");  
((ProgressDialog) dialog).setMessage("Your content is loading.. \nPlease wait..");
((ProgressDialog) dialog).setIndeterminate(true);
dialog.setCancelable(false);
dialog.show();
}

private void ProgressBar_hide() {
dialog.dismiss();
}
class uploadaudio extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
ProgressBar_show();
}

@Override
protected String doInBackground(String... params) {
load_JsonSections();
return null;
}
@SuppressLint("SetJavaScriptEnabled")
protected void onPostExecute(String result) {  
super.onPostExecute(result);
 
Log.i("onPostExecute==> ", arrayParents.toString());
AddedHistoryAdapter adapter = new AddedHistoryAdapter(AndroidJSONParsingActivity.this, R.layout.row_acc_info, arrayParents );   
listview.setAdapter(adapter); 
ProgressBar_hide();  
}
}
  
private void load_JsonSections() {
arrayParents = new ArrayList<SearchParent>();  
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(string);
HttpResponse response;
try {
response = httpclient.execute(httpget);  
HttpEntity entity = response.getEntity();  

if (entity != null) {

InputStream instream = entity.getContent();
String result = convertStreamToString(instream);
JSONObject json = new JSONObject(result);
 
JSONArray jsonOnb = json.getJSONArray("contacts");  
for (int i = 0; i < jsonOnb.length(); i++) {
JSONObject _Jsonquery = jsonOnb.getJSONObject(i);  

if (_Jsonquery.has("id")) {
 
id = _Jsonquery.getString("id");
name = _Jsonquery.getString("name");
mail = _Jsonquery.getString("email");  
arrayParents.add(new SearchParent(name, mail, id));  
}  
}
instream.close();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
}

private String convertStreamToString(InputStream is) {

BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();

String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}

AdapterActivity.java
public class AddedHistoryAdapter extends ArrayAdapter<SearchParent> {
//private final static String TAG = AccountsAdapter.class.getSimpleName();
private ArrayList<SearchParent> _valu;
private Context context;

public AddedHistoryAdapter(Context _context, int _names, ArrayList<SearchParent> valu) {
super(_context, R.layout.row_acc_info, valu);
context = _context;
_valu = valu;
Log.i("_value= ", _valu.toString());
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
//View view = convertView;
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.row_acc_info, parent, false);
}

TextView acc_id = (TextView) convertView.findViewById(R.id.textView_id);  
TextView acc_name = (TextView) convertView.findViewById(R.id.textView1);  
TextView acc_date = (TextView) convertView.findViewById(R.id.textView2);  
 
SearchParent acc_info = _valu.get(position);    
String name = acc_info.getName();
String date = acc_info.getMail();
String ID = acc_info.getId();
acc_name.setText(name);
acc_date.setText(date);
acc_id.setText(ID); 
TotalhistoryInfo total_acc = new TotalhistoryInfo();
total_acc.setPage_name(name);
total_acc.setPage_date(date);
total_acc.setId(ID);
convertView.setTag(total_acc);  
return (convertView);
}  
}

SearchParent.java
public class SearchParent {  
private String Id;
private String name;
private String mail;
public String getId() {
return Id;
}
public void setId(String id) {
this.Id = id;
}
public SearchParent(String i, String d, String p) {
this.mail = d;
this.name = i;
this.Id = p;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMail() {
return mail;
}
public void setMail(String mail) {
this.mail = mail;
} 
}

TotalHistoryInfo.java
public class TotalhistoryInfo {
private String id;
private String page_name;
private String page_date;

public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getPage_date() {
return page_date;
}
public void setPage_date(String page_date) {
this.page_date = page_date;
}
public String getPage_name() {
return page_name;
}
public void setPage_name(String acc_info) {
this.page_name = acc_info;
}
}
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