Skip to main content

Android AutoCompleteTextView with Text Highlighter

 We all know about AutoCompleteTextView , It is an editable text view which shows a list of suggestions when user starts typing text. Basically it is use for filter the list based on entered characters. In this post we will create custom AutoCompleteTextView with Text Highlighter .So lets move to the coding part.

Step 1: Create spinner_item_divider.xml file under drawable folder

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    >
    <item>
        <shape android:shape="rectangle">
            <solid android:color="#000000"/>
        </shape>
    </item>
    <item android:bottom="0.5dp">
        <shape android:shape="rectangle">
            <solid android:color="#ffffff"/>
        </shape>
    </item>
</layer-list>

Step 2: Create activity_auto_complete_tvmain.xml under layout folder

<?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="vertical">

    <android.support.design.widget.TextInputLayout
        android:layout_width="match_parent"
       android:layout_gravity="center"
        android:layout_height="wrap_content">

        <com.droidmedium.AutoCompleteTV
            android:id="@+id/languages"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:completionThreshold="1"
            android:hint="language"
            android:imeOptions="actionNext"
            android:maxLines="1"
            android:paddingLeft="10dp"
            android:paddingTop="15dp"
            android:paddingRight="10dp"
            android:paddingBottom="15dp"
            android:singleLine="false"
            android:textColor="#333333"
            android:textColorHint="#808080"
            android:textSize="12sp" />

    </android.support.design.widget.TextInputLayout>

</LinearLayout>

Step 3: Again create row_dropdown.xml under layout folder

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/textview"
    style="?android:attr/dropDownItemStyle"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:ellipsize="marquee"
    android:paddingTop="8dp"
    android:paddingBottom="8dp"
    android:background="@drawable/spinner_item_divider"
    android:singleLine="true"
    android:textColor="#333333"
    android:textSize="15sp"
    tools:text="text"
    />

Step 4: Now Create AutoCompleteAdapter.java

package com.droidmedium;

import android.content.Context;
import android.graphics.Typeface;
import android.support.annotation.IdRes;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.StyleSpan;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;


import java.text.Normalizer;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

public class AutoCompleteAdapter<T> extends ArrayAdapter<T> implements Filterable {

    private Context context;
    @LayoutRes
    private int layoutRes;
    @IdRes
    private int textViewResId;
    private ArrayList<T> fullList;
    private ArrayList<T> originalValues;
    private ArrayFilter filter;
    private LayoutInflater inflater;
    private String query = "";

    public AutoCompleteAdapter(@NonNull Context context, @LayoutRes int resource, @IdRes int textViewResourceId, @NonNull List<T> objects) {
        super(context, resource, textViewResourceId, objects);
        this.context = context;
        layoutRes = resource;
        textViewResId = textViewResourceId;
        fullList = (ArrayList<T>) objects;
        originalValues = new ArrayList<>(fullList);
        inflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return fullList.size();
    }

    @Override
    public T getItem(int position) {
        return fullList.get(position);
    }

    @Override
    public @NonNull
    View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        return createViewFromResource(inflater, position, convertView, parent, layoutRes);
    }

    private @NonNull
    View createViewFromResource(@NonNull LayoutInflater inflater, int position,
                                @Nullable View convertView, @NonNull ViewGroup parent, int resource) {
        final View view;
        final TextView text;

        if (convertView == null) {
            view = inflater.inflate(resource, parent, false);
        } else {
            view = convertView;
        }

        try {
            if (textViewResId == 0) {
                //  If no custom field is assigned, assume the whole resource is a TextView
                text = (TextView) view;
            } else {
                //  Otherwise, find the TextView field within the layout
                text = view.findViewById(textViewResId);

                if (text == null) {
                    throw new RuntimeException("Failed to find view with ID "
                            + context.getResources().getResourceName(textViewResId)
                            + " in item layout");
                }
            }
        } catch (ClassCastException e) {
            Log.e("ArrayAdapter", "You must supply a resource ID for a TextView");
            throw new IllegalStateException("ArrayAdapter requires the resource ID to be a TextView", e);
        }

        final T item = getItem(position);
        text.setText(highlight(query, item.toString()));

        return view;
    }

    @Override
    public @NonNull
    Filter getFilter() {
        if (filter == null) {
            filter = new ArrayFilter();
        }
        return filter;
    }

    private class ArrayFilter extends Filter {
        private final Object lock = new Object();

        @Override
        protected FilterResults performFiltering(CharSequence prefix) {
            FilterResults results = new FilterResults();
            if (prefix == null) {
                query = "";
            } else {
                query = prefix.toString();
            }
            if (originalValues == null) {
                synchronized (lock) {
                    originalValues = new ArrayList<>(fullList);
                }
            }

            if (prefix == null || prefix.length() == 0) {
                synchronized (lock) {
                    ArrayList<T> list = new ArrayList<>(originalValues);
                    results.values = list;
                    results.count = list.size();
                }
            } else {
                final String prefixString = prefix.toString().toLowerCase();
                ArrayList<T> values = originalValues;
                int count = values.size();

                ArrayList<T> newValues = new ArrayList<>(count);

                for (int i = 0; i < count; i++) {
                    T item = values.get(i);
                    if (item.toString().toLowerCase().contains(prefixString)) {
                        newValues.add(item);
                    }

                }
                results.values = newValues;
                results.count = newValues.size();
            }

            return results;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            if (results.values != null) {
                fullList = (ArrayList<T>) results.values;
            } else {
                fullList = new ArrayList<>();
            }
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }

    }

    private static CharSequence highlight(@NonNull String search, @NonNull CharSequence originalText) {
        if (search.isEmpty())
            return originalText;

        // ignore case and accents
        // the same thing should have been done for the search text
        String normalizedText = Normalizer
                .normalize(originalText, Normalizer.Form.NFD)
                .replaceAll("\\p{InCombiningDiacriticalMarks}+", "")
                .toLowerCase(Locale.ENGLISH);

        int start = normalizedText.indexOf(search.toLowerCase(Locale.ENGLISH));
        if (start < 0) {
            // not found, nothing to do
            return originalText;
        } else {
            // highlight each appearance in the original text
            // while searching in normalized text
            Spannable highlighted = new SpannableString(originalText);
            while (start >= 0) {
                int spanStart = Math.min(start, originalText.length());
                int spanEnd = Math.min(start + search.length(),
                        originalText.length());

                highlighted.setSpan(new StyleSpan(Typeface.BOLD), spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

                start = normalizedText.indexOf(search, spanEnd);
            }

            return highlighted;
        }
    }
}

Step 5: Create AutoCompleteTV.java

package com.droidmedium;

import android.content.Context;
import android.support.v7.widget.AppCompatAutoCompleteTextView;
import android.util.AttributeSet;
import android.view.MotionEvent;

public class AutoCompleteTV extends AppCompatAutoCompleteTextView {

    public AutoCompleteTV(Context context) {
        super(context);
    }

    public AutoCompleteTV(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public AutoCompleteTV(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            performClick();
        }
        return super.onTouchEvent(event);
    }

    @Override
    public boolean performClick() {
        super.performClick();
        return true;
    }
}

Step 6: Create AutoCompleteTVMain.java

package com.droidmedium;


import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AutoCompleteTextView;

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

public class AutoCompleteTVMain extends AppCompatActivity {
  
    AutoCompleteTextView acTextView;
    AutoCompleteAdapter adapter;
    List<String> wordList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_auto_complete_tvmain);


         wordList = new ArrayList<String>();
         wordList.add("C");
         wordList.add("C++");
         wordList.add("JAVA");
         wordList.add("C#");
         wordList.add("PHP");
         wordList.add("JavaScript");
         wordList.add("jQuery");
         wordList.add("AJAX");
         wordList.add("JSON");


         adapter = new AutoCompleteAdapter(this,
                R.layout.row_dropdown,
                R.id.textview,wordList);
        acTextView = (AutoCompleteTextView) findViewById(R.id.languages);
             acTextView.setThreshold(1);
            acTextView.setAdapter(adapter);


        acTextView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent motionEvent) {

                    v.requestFocus();
                    v.performClick(); 

                return false;
            }
        });


        acTextView.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

                  String text = acTextView.getText().toString().toLowerCase(Locale.getDefault());

                  setnewMethod(text);

            }

            @Override
            public void afterTextChanged(Editable editable) {


            }
        });


        acTextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                String selectedis=adapterView.getItemAtPosition(i).toString();
                System.out.println("selected item is"+selectedis);
            }
        });


    }


    private void setnewMethod(String text)
    {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {

// perform your action here to refresh list or get new list from server use wordList.clear(); method and add new list

                 adapter = new AutoCompleteAdapter(AutoCompleteTVMain.this, R.layout.row_dropdown, R.id.textview,wordList);
                 acTextView.setThreshold(1);   // start from first character
                 acTextView.setAdapter(adapter);
                 adapter.notifyDataSetChanged();

            }
        });

    }



}

Now that all for coding part run the app and you will find the result as 




Thank you and if you like this article Share this on your social platform .😇😇😇


Labels:

Comments

Post a Comment

Popular posts from this blog

How to Download Apk file from Url and Install Programmatically

In this post we learn about download apk file from server or website and then install it Programmatically in Phone. Sometimes we have to download external apk file from server and then install if downloading successfully finished.For this we use AsyncTask class  for background process. So here is Code Snippet for this task.Lets Start :- Before this we have to add these Permissions in Manifest.xml file : <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> DownloadNewVersion.java class DownloadNewVersion extends AsyncTask<String,Integer,Boolean> { @Override protected void onPreExecute() { super.onPreExecute(); bar = new ProgressDialog(getActivity()); bar.setCancelable(false); bar.setMessage("Downl...
6 comments
Read more

How to Implement Item Click Interface in Android?

In Android development, creating interactive lists is essential to most apps. Often, these lists include items that users can click on to trigger actions such as opening a new screen or displaying more information. In this tutorial, we’ll walk through how to implement an item click interface in Android using Java and XML. By the end of this guide, you’ll know how to create a RecyclerView with an item click listener that responds to user taps. This approach is widely used in modern Android development because RecyclerView is both flexible and efficient. Step 1: Set Up Your Android Project First, create a new Android project in Android Studio. Make sure to choose Java as the programming language. Step 2: Add Dependencies Make sure that you have the required dependencies for RecyclerView in your build.gradle file. If not, add them like this: dependencies {     implementation 'androidx.recyclerview:recyclerview:1.2.1' } Sync the project after adding the dependency. Step 3: Define ...
Post a Comment
Read more

Working with Android 11 (Changes and Security Features)

 Hello everyone , I am here with new article which is hot topic nowadays "Android 11" .The stable version of Android.  Android 11 is the eleventh major release and 18th version of Android, the mobile operating system developed by the Open Handset Alliance led by Google. It was released on September 8, 2020.It is comes with many security features and other features as well . And it is now compulsory in play store  to upload new apps with API lavel 30 which is compatible with Android 11 and from November onwards old apps also have to update with API 30 .Some other guidelines you can check out from here . Play Store Guidelines So its clear that we have to update our apps with API level 30 .But Android 11 comes with some changes as well which we have to do in our projects. For example from Android developer site "Android 11 (API level 30) further enhances the platform, giving better protection to app and user data on external storage. ". Scoped storage enforcement: Apps...
Post a Comment
Read more