Deep Linking Demo

First of all login Or SignUp in https://dashboard.branch.io/

Now Login in to https://dashboard.branch.io/login


Add dependency in build.gradle file

compile 'io.branch.sdk.android:library:2.8.0'


Code
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import io.branch.indexing.BranchUniversalObject;
import io.branch.referral.Branch;
import io.branch.referral.BranchError;
import io.branch.referral.util.LinkProperties;

public class DeepLinking extends AppCompatActivity {

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

    @Override
    public void onStart() {
        super.onStart();
        Branch branch = Branch.getInstance();

        branch.initSession(new Branch.BranchUniversalReferralInitListener() {
            @Override
            public void onInitFinished(BranchUniversalObject branchUniversalObject, LinkProperties linkProperties, BranchError error) {
                if (error == null) {
                    // params are the deep linked params associated with the link that the user clicked -> was re-directed to this app
                    // params will be empty if no data found
                    // ... insert custom logic here ...
                } else {
                    Log.i("MyApp", error.getMessage());
                }
            }
        }, this.getIntent().getData(), this);
    }


    @Override
    protected void onNewIntent(Intent intent) {
//        super.onNewIntent(intent);
        this.setIntent(intent);

    }

}

Change StatusBar color android

Using following way we can change statusbar color 

We also have to check version of the os for change statusbar color.


CustomControlsActivity.java

public class CustomControlsActivity extends AppCompatActivity {


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.custom_controls_layout);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            getWindow().setStatusBarColor(ContextCompat.getColor(this, R.color.colorPrimaryDark));
        }
    }

}

Facebook Login Integration

The Facebook SDK for Android enables people to sign into your app with Facebook Login. When people log into your app with Facebook they can grant permissions to your app so you can retrieve information or perform actions on Facebook on their behalf.

Generate your app signature for facebook

1)Open Command prompt
2)Fire Keytool command

keytool -exportcert -alias androiddebugkey -keystore "<path-to-users-directory>\.android\debug.keystore" | openssl sha1 -binary | openssl base64

KeyTool Path from file location

keytool -exportcert -alias androiddebugkey -keystore "C:\Users\Your name\.android\debug.keystore" | openssl sha1 -binary | openssl base64

3)While you generating key hash it will ask for password you have to give password android

Create Application after generating kayhash

Create your new facebook application using below link

https://developers.facebook.com/apps

Add Gradle dependency to build.gradle in your android studio project

compile 'com.facebook.android:facebook-android-sdk:4.23.0'

Add to your AndroidManifest.xml

<meta-data
            android:name="com.facebook.sdk.ApplicationId"
            android:value="your created facebook_app_id" />
        <meta-data
            android:name="com.facebook.sdk.AutoLogAppEventsEnabled"
            android:value="false" />

        <activity
            android:name="com.facebook.FacebookActivity"
            android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:label="@string/app_name" />
        <activity
            android:name="com.facebook.CustomTabActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data android:scheme="@string/fb_login_protocol_scheme" />
            </intent-filter>
        </activity>

        <provider
            android:name="com.facebook.FacebookContentProvider"
            android:authorities="com.facebook.app.FacebookContentProvider1234"

            android:exported="true" />



==> activity_facebook_login.xml

<?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:layout_margin="15dp"
    android:gravity="center"
    android:orientation="vertical">


    <RelativeLayout
        android:id="@+id/rl_facebook_invite"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="15dp"
        android:background="@drawable/bg_btn_rounded_fb"
        android:gravity="center">

        <ImageView
            android:id="@+id/iv_fb_logo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginRight="10dp"
            android:src="@drawable/icon_facebook" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_toEndOf="@+id/iv_fb_logo"
            android:layout_toRightOf="@+id/iv_fb_logo"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:text="Invite Friend"
            android:textColor="@color/white"
            android:textSize="18dp"
            android:textStyle="bold" />

    </RelativeLayout>


    <com.facebook.login.widget.LoginButton
        android:id="@+id/login_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="15dp"
        android:paddingBottom="10dp"
        android:paddingTop="10dp"
        android:textSize="18dp" />



</LinearLayout>


==>FaceBookLoginActivity.java

import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.RelativeLayout;

import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.appevents.AppEventsLogger;
import com.facebook.login.LoginManager;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.facebook.share.model.AppInviteContent;
import com.facebook.share.widget.AppInviteDialog;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import butterknife.BindView;
import butterknife.ButterKnife;


public class FaceBookLoginActivity extends AppCompatActivity implements View.OnClickListener {

    @BindView(R.id.rl_facebook_invite)
    RelativeLayout rl_facebook_invite;

    @BindView(R.id.login_button)
    LoginButton login_button;


    String appLinkUrl, previewImageUrl;
    CallbackManager callbackManager;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_facebook_login);
        ButterKnife.bind(this);

        init();
        printHashKey();
        rl_facebook_invite.setOnClickListener(this);
    }

    public void printHashKey() {
        // Add code to print out the key hash
        try {
            PackageInfo info = getPackageManager().getPackageInfo(
                    "com.yourpackage.name",
                    PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                Log.d("Facebook KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
        } catch (PackageManager.NameNotFoundException e) {

        } catch (NoSuchAlgorithmException e) {

        }
    }

    private void init() {
        FacebookSdk.sdkInitialize(getApplicationContext());
        AppEventsLogger.activateApp(this);

//        if User want to logout from facebook than use following statement
//        LoginManager.getInstance().logOut();

        callbackManager = CallbackManager.Factory.create();

        // Callback registration
        login_button.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                // App code
            }

            @Override
            public void onCancel() {
                // App code
            }

            @Override
            public void onError(FacebookException exception) {
                // App code
            }
        });

        LoginManager.getInstance().registerCallback(callbackManager,
                new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(LoginResult loginResult) {
                        // App code
                    }

                    @Override
                    public void onCancel() {
                        // App code
                    }

                    @Override
                    public void onError(FacebookException exception) {
                        // App code
                    }
                });
    }

    @Override
    public void onClick(View view) {
        if (view.getId() == R.id.rl_facebook_invite) {
            //Facebook App invites friends
            appLinkUrl = "your app link url";
            previewImageUrl = "preview image url";

//                Uri targetUrl = AppLinks.getTargetUrlFromInboundIntent(SocialMediaLoginActivity.this, getIntent());
//                if (targetUrl != null) {
//                    Log.i("Activity", "App Link Target URL: " + targetUrl.toString());
//                }

            if (AppInviteDialog.canShow()) {
                AppInviteContent content = new AppInviteContent.Builder()
                        .setApplinkUrl(appLinkUrl)
                        .setPreviewImageUrl(previewImageUrl)
//                    .setPromotionDetails("Example Promotional Message", "EXAMPLEPROMO ")
                        .build();
                AppInviteDialog.show(FaceBookLoginActivity.this, content);
            }
        }
    }

}

ExpandableListView Demo

Android ExpandableListView. Android ExpandableListView is a view that shows items in a vertically scrolling two-level list. It differs from a ListView by allowing two levels which are groups that can be easily expanded and collapsed by touching to view and their respective children items.

==> activity_expandablelistview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        android:titleTextColor="@color/white"
        app:titleTextColor="@color/white"></android.support.v7.widget.Toolbar>

    <ExpandableListView
        android:id="@+id/lvExp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />


</LinearLayout>


==>list_item.xml (Listview Item Row)

<?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="wrap_content"
    android:layout_gravity="left"
    android:background="#ffffff"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="left"
        android:gravity="left"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/tv_event"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="3dp"
            android:text="TextView"
            android:textColor="#000000"
            android:textSize="16dp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/tv_date"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:padding="4dp"
            android:text="TextView" />

    </LinearLayout>


</LinearLayout>

==> ExpandableListAdapter.java

import java.util.HashMap;
import java.util.List;

import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;


public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Context _context;
    private List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap<String, List<String>> _listDataChild;

    public ExpandableListAdapter(Context context, List<String> listDataHeader,
                                 HashMap<String, List<String>> listChildData) {
        this._context = context;
        this._listDataHeader = listDataHeader;
        this._listDataChild = listChildData;
    }

    @Override
    public Object getChild(int groupPosition, int childPosititon) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .get(childPosititon);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, final int childPosition,
                             boolean isLastChild, View convertView, ViewGroup parent) {

        final String childText = (String) getChild(groupPosition, childPosition);

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item, null);
        }

        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.tv_event);//lblListItem

        txtListChild.setText(childText);
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return this._listDataHeader.get(groupPosition);
    }

    @Override
    public int getGroupCount() {
        return this._listDataHeader.size();
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        String headerTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group, null);
        }

        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.lblListHeader);
        lblListHeader.setTypeface(null, Typeface.BOLD);
        lblListHeader.setText(headerTitle);

        return convertView;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

}

==> ExpandableListViewActivity.java

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.widget.ExpandableListView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;


public class ExpandableListViewActivity extends AppCompatActivity {

    ExpandableListAdapter listAdapter;

    @BindView(R.id.lvExp)
    ExpandableListView expListView;

    @BindView(R.id.toolbar)
    Toolbar toolbar;

    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_expandablelistview);
        ButterKnife.bind(this);
        setSupportActionBar(toolbar);
        getSupportActionBar().setTitle("Expandable Listview");
        prepareListData();

        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

        // setting list adapter
        expListView.setAdapter(listAdapter);
    }

    private void prepareListData() {
        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();

        // Adding child data
        listDataHeader.add("Top 250");
        listDataHeader.add("Now Showing");
        listDataHeader.add("Coming Soon..");

        // Adding child data
        List<String> top250 = new ArrayList<String>();
        top250.add("The Shawshank Redemption");
        top250.add("The Godfather");
        top250.add("The Godfather: Part II");
        top250.add("Pulp Fiction");
        top250.add("The Good, the Bad and the Ugly");
        top250.add("The Dark Knight");
        top250.add("12 Angry Men");

        List<String> nowShowing = new ArrayList<String>();
        nowShowing.add("The Conjuring");
        nowShowing.add("Despicable Me 2");
        nowShowing.add("Turbo");
        nowShowing.add("Grown Ups 2");
        nowShowing.add("Red 2");
        nowShowing.add("The Wolverine");

        List<String> comingSoon = new ArrayList<String>();
        comingSoon.add("2 Guns");
        comingSoon.add("The Smurfs 2");
        comingSoon.add("The Spectacular Now");
        comingSoon.add("The Canyons");
        comingSoon.add("Europa Report");

        listDataChild.put(listDataHeader.get(0), top250); // Header, Child data
        listDataChild.put(listDataHeader.get(1), nowShowing);
        listDataChild.put(listDataHeader.get(2), comingSoon);
    }

}

SQLite Database demo

SQLite is an Open Source database. SQLite supports standard relational database features like SQL syntax, transactions and prepared statements. The database requires limited memory at runtime

==> DatabaseHandler.java

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.util.ArrayList;
import java.util.List;

public class DatabaseHandler extends SQLiteOpenHelper {

    // All Static variables
    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "contactsManager";

    // Contacts table name
    private static final String TABLE_CONTACTS = "contacts";

    // Contacts Table Columns names
    private static final String KEY_ID = "id";
    private static final String KEY_NAME = "name";
    private static final String KEY_PH_NO = "phone_number";

    public DatabaseHandler(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);

    }

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
                + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
                + KEY_PH_NO + " TEXT" + ")";
        db.execSQL(CREATE_CONTACTS_TABLE);
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);

        // Create tables again
        onCreate(db);
    }


    /**
     * All CRUD(Create, Read, Update, Delete) Operations
     */

    // Adding new contact
    public void addContact(Contact contact) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, contact.getName()); // Contact Name
        values.put(KEY_PH_NO, contact.getPhoneNumber()); // Contact Phone

        // Inserting Row
        db.insert(TABLE_CONTACTS, null, values);
        db.close(); // Closing database connection
    }

    // Getting single contact
    public Contact getContact(int id) {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TABLE_CONTACTS, new String[]{KEY_ID,
                        KEY_NAME, KEY_PH_NO}, KEY_ID + "=?",
                new String[]{String.valueOf(id)}, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();

        Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
                cursor.getString(1), cursor.getString(2));
        // return contact
        return contact;
    }

    // Getting All Contacts
    public List<Contact> getAllContacts() {
        List<Contact> contactList = new ArrayList<Contact>();
        // Select All Query
        String selectQuery = "SELECT  * FROM " + TABLE_CONTACTS;

        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        // looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {
                Contact contact = new Contact();
                contact.setID(Integer.parseInt(cursor.getString(0)));
                contact.setName(cursor.getString(1));
                contact.setPhoneNumber(cursor.getString(2));
                // Adding contact to list
                contactList.add(contact);
            } while (cursor.moveToNext());
        }

        // return contact list
        return contactList;
    }

    // Updating single contact
    public int updateContact(Contact contact) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, contact.getName());
        values.put(KEY_PH_NO, contact.getPhoneNumber());

        // updating row
        return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
                new String[]{String.valueOf(contact.getID())});
    }

    // Deleting single contact
    public void deleteContact(Contact contact) {
        SQLiteDatabase db = this.getWritableDatabase();
        db.delete(TABLE_CONTACTS, KEY_ID + " = ?",
                new String[]{String.valueOf(contact.getID())});
        db.close();
    }


    // Getting contacts Count
    public int getContactsCount() {
        String countQuery = "SELECT  * FROM " + TABLE_CONTACTS;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        cursor.close();

        // return count
        return cursor.getCount();
    }

}

==> activity_db.xml

<?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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        android:titleTextColor="@color/white"
        app:titleTextColor="@color/white"></android.support.v7.widget.Toolbar>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="15dp"
        android:text="Demo" />


    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter Name"
        android:padding="5dp"
        android:textSize="18dp" />


    <TextView
        android:id="@+id/txt_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:padding="5dp"
        android:textSize="18dp" />


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="15dp"
        android:text="AddNew" />

    <EditText
        android:id="@+id/edt_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/edt_mno"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/btn_addnew"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Add New" />


</LinearLayout>

==> Contact.java

public class Contact {

    //private variables
    int _id;
    String _name;
    String _phone_number;

    // Empty constructor
    public Contact() {

    }

    // constructor
    public Contact(int id, String name, String _phone_number) {
        this._id = id;
        this._name = name;
        this._phone_number = _phone_number;
    }

    // constructor
    public Contact(String name, String _phone_number) {
        this._name = name;
        this._phone_number = _phone_number;
    }

    // getting ID
    public int getID() {
        return this._id;
    }

    // setting id
    public void setID(int id) {
        this._id = id;
    }

    // getting name
    public String getName() {
        return this._name;
    }

    // setting name
    public void setName(String name) {
        this._name = name;
    }

    // getting phone number
    public String getPhoneNumber() {
        return this._phone_number;
    }

    // setting phone number
    public void setPhoneNumber(String phone_number) {
        this._phone_number = phone_number;
    }

}

==> CustomerAdapter.java

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.TextView;
import java.util.ArrayList;

public class CustomerAdapter extends ArrayAdapter<Contact> {
    private final String MY_DEBUG_TAG = "CustomerAdapter";
    private ArrayList<Contact> items;
    private ArrayList<Contact> itemsAll;
    private ArrayList<Contact> suggestions;
    private int viewResourceId;

    public CustomerAdapter(Context context, int viewResourceId, ArrayList<Contact> items) {
        super(context, viewResourceId, items);
        this.items = items;
        this.itemsAll = (ArrayList<Contact>) items.clone();
        this.suggestions = new ArrayList<Contact>();
        this.viewResourceId = viewResourceId;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(viewResourceId, null);
        }
        Contact customer = items.get(position);
        if (customer != null) {
            TextView customerNameLabel = (TextView) v.findViewById(R.id.txt_name);
            if (customerNameLabel != null) {
//              Log.i(MY_DEBUG_TAG, "getView Customer Name:"+customer.getName());
                customerNameLabel.setText(customer.getName());
            }
        }
        return v;
    }

    @Override
    public Filter getFilter() {
        return nameFilter;
    }

    Filter nameFilter = new Filter() {
        @Override
        public String convertResultToString(Object resultValue) {
            String str = ((Contact) (resultValue)).getName();
            return str;
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            if (constraint != null) {
                suggestions.clear();
                for (Contact customer : itemsAll) {
                    if (customer.getName().toLowerCase().startsWith(constraint.toString().toLowerCase())) {
                        suggestions.add(customer);
                    }
                }
                FilterResults filterResults = new FilterResults();
                filterResults.values = suggestions;
                filterResults.count = suggestions.size();
                return filterResults;
            } else {
                return new FilterResults();
            }
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            ArrayList<Contact> filteredList = (ArrayList<Contact>) results.values;
            if (results != null && results.count > 0) {
                clear();
                for (Contact c : filteredList) {
                    add(c);
                }
                notifyDataSetChanged();
            }
        }
    };


}

==> DBAcitivity.java

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import butterknife.BindView;
import butterknife.ButterKnife;


public class DBActicvity extends AppCompatActivity {


    @BindView(R.id.autoCompleteTextView)
    AutoCompleteTextView autoCompleteTextView;

    @BindView(R.id.txt_title)
    TextView txt_title;

    @BindView(R.id.edt_name)
    EditText edt_name;

    @BindView(R.id.edt_mno)
    EditText edt_mno;

    @BindView(R.id.btn_addnew)
    Button btn_addnew;

    @BindView(R.id.toolbar)
    Toolbar toolbar;

    DatabaseHandler db;
    ArrayList<Contact> contacts;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_db);
        ButterKnife.bind(this);
        db = new DatabaseHandler(this);
        setSupportActionBar(toolbar);
        getSupportActionBar().setTitle("DB");
        fillData();
        autoCompleteTextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Log.e("selected Item==>", contacts.get(i).getName());

                for (Contact contact : contacts) {
                    if (contacts.get(i).getName().equalsIgnoreCase(contact.getName())) {
                        txt_title.setText(contact.getID() + " " + contact.getName() + " " + contact.getPhoneNumber());
                    }
                }

            }
        });

        btn_addnew.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                db.addContact(new Contact(edt_name.getText().toString(), edt_mno.getText().toString()));
                edt_name.setText("");
                edt_mno.setText("");
                Toast.makeText(DBActicvity.this, "New Record Added", Toast.LENGTH_SHORT).show();
                fillData();
            }
        });
    }

    private void fillData() {
        //fill data with new value using adapter
        contacts = db.getAllContacts();
        for (Contact cn : contacts) {
            String log = "Id: " + cn.getID() + " ,Name: " + cn.getName() + " ,Phone: " + cn.getPhoneNumber();
            // Writing Contacts to log
            Log.d("Name: ", log);

        }
        CustomerAdapter customerAdapter = new CustomerAdapter(this, R.layout.ac_list_item, contacts);
        autoCompleteTextView.setAdapter(customerAdapter);

    }

}