Android EditText with TextWatcher

Android EditText with TextWatcher Example with examples of Activity and Intent, Fragments, Menu, Service, alarm manager, storage, sqlite, xml, json, multimedia, speech, web service, telephony, animation and graphics

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Android EditText with TextWatcher (Searching data from ListView)

Android EditText is a subclass of TextView. EditText is used for entering and modifying text. While using EditText width, we must specify its input type in inputType property of EditText which configures the keyboard according to input.

EditText uses TextWatcher interface to watch change made over EditText. For doing this, EditText calls the addTextChangedListener() method.

Methods of TextWatcher

beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3): It is executed before making any change over EditText.
onTextChanged(CharSequence cs, int arg1, int arg2, int arg3): It is executed while making any change over EditText.
afterTextChanged(Editable arg0): It is executed after change made over EditText.

Example of EditText with TextWatcher()

In this example, we will implement EditText with TextWatcher to search data from ListView.

activity_main.xml

Create an activity_main.xml file in layout folder containing EditText and ListView.

File: activity_main.xml

Create another file list_item.xml in layout folder which contains data of ListView.

list_item.xm

File: list_item.xml

Activity class

Activity class

package com.example.test.searchfromlistview;

import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private ListView lv;
    private EditText editText;
    private ArrayAdapter adapter;

    private String products[] = {"Apple", "Banana","Pinapple", "Orange", "Papaya", "Melon",
            "Grapes", "Water Melon","Lychee", "Guava", "Mango", "Kivi"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = (ListView) findViewById(R.id.listView);
        editText = (EditText) findViewById(R.id.editText);
        adapter = new ArrayAdapter(this, R.layout.list_item, R.id.product_name, products);
        lv.setAdapter(adapter);

        editText.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                adapter.getFilter().filter(cs);
            }

            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
                Toast.makeText(getApplicationContext(),"before text change",Toast.LENGTH_LONG).show();
            }

            @Override
            public void afterTextChanged(Editable arg0) {
                Toast.makeText(getApplicationContext(),"after text change",Toast.LENGTH_LONG).show();
            }
        });
    }
}

Output

Next TopicAndroid Life Cycle of Activity

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