AutoComplete TextBox in Android

In this blog, I will show how to achieve AutoComplete TextBox property, and how it works.

Java Code:


MainActivity.java

package com.example.autocomplete;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity implements TextWatcher {
    AutoCompleteTextView autocomplete;
    ListView listview;
    ArrayList<String> listitems = new ArrayList<String>();
    SQLiteDatabase sqlitedatabase;
    Button save, cancel;

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

        sqlitedatabase = this
                .openOrCreateDatabase("sample", MODE_PRIVATE, null);
        try {
            sqlitedatabase
                    .execSQL("create table if not exists student(name varchar(30))");
                   } catch (Exception e) {
            System.err.println("error" + e.toString());
        }
        save = (Button) findViewById(R.id.btnsave);
        save.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                String value = autocomplete.getText().toString();
                try {
                    sqlitedatabase.execSQL("insert into student (name) values('"
                            + value + "')");
                    Toast.makeText(getApplicationContext(), "value stored",
                            Toast.LENGTH_SHORT).show();
                                      Intent intent = new Intent(MainActivity.this,
                            MainActivity.class);
                    startActivity(intent);
                } catch (Exception ex) {
                    System.err.println("error");
                }

            }
        });
        cancel = (Button) findViewById(R.id.btncancel);
        cancel.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MainActivity.this,
                        MainActivity.class);
                startActivity(intent);

            }
        });
        Cursor c = sqlitedatabase.rawQuery("select distinct name from student",
                null);

        if (c != null) {
            if (c.moveToFirst()) {
                do {
                    String Auto = c.getString(c.getColumnIndex("name"));
                    listitems.add(Auto);
                } while (c.moveToNext());
            }

        }
        c.close();

        final String[] arrayOfStrings;
        arrayOfStrings = listitems.toArray(new String[listitems.size()]);
        autocomplete = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
        autocomplete.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, android.R.id.text1,
                arrayOfStrings));

    }

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

    }

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

    }

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

    }
}


activity_main.xml

  <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_margin="10dp"
        android:completionThreshold="1"
        android:ems="10" >

        <requestFocus />
    </AutoCompleteTextView>

    <TextView
        android:id="@+id/txtviewenter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_marginTop="30dp"
        android:paddingRight="2dp"
        android:text="Enter Text"
        android:textSize="20sp" />

    <LinearLayout
        android:id="@+id/buttonlayout"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_margin="5dp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/btnsave"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="Save"
            android:textSize="20sp"
            android:textStyle="bold" >
        </Button>

        <Button
            android:id="@+id/btncancel"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="Cancel"
            android:textSize="20sp"
            android:textStyle="bold" >
        </Button>
    </LinearLayout>

    <ListView
        android:id="@+id/listView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:visibility="invisible" />


 Screen Shots:

 Save text in Local database.

Again open the application, try to enter the text, the available words starts with the letter entered pop ups.