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Simple RecyclerView example with filter option in Android

Hi Guys, Maybe you all are expert in terms of using RecyclerView in android. This blog is simple example for using filter option with RecyclerView adapter. As for now you will instantiate RecyclerView and set the adapter to RecyclerView as following way. RecyclerView list = (RecyclerView) findViewById(R.id.list); list.setLayoutManager(new LinearLayoutManager(this)); list.setHasFixedSize(true); ArrayList&ltNumber&gt numbers = new ArrayList&lt&gt(); String ONEs[] = {"ZERO", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE", "TEN"}; String TENs[] = {"ZERO", "TEN", "TWENTY", "THIRTY", "FOURTY", "FIFTY", "SIXTY", "SEVENTY", "EIGHTY", "NINETY", "HUNDRED"}; String HUNDREDS[] = {"ZERO", "HUNDRED", "TWO HUND

Simple Timer Example in android

Here is the simple example of using timer in Android
public void startTimer() {
    timer = new Timer();
    TimerTask timerTask = new TimerTask() {

        @Override
        public void run() {
            runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    textView.setText(String.format(Locale.getDefault(), "%d", time));
                    if (time > 0)
                        time -= 1;
                    else {
                        textView.setText(R.string.hello_world);
                        btnStart.setChecked(false);
                    }
                }
            });
        }
    };
    timer.scheduleAtFixedRate(timerTask, 0, 1000);
}
Full class
MainActivity.java
package com.guna.testapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.ToggleButton;

import java.util.Locale;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private int time = 20;
    private Timer timer;
    private TextView textView;
    private ToggleButton btnStart;

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

        textView = findViewById(R.id.textView);
        btnStart = findViewById(R.id.toggleButton);

        btnStart.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    time = 20;
                    startTimer();
                } else {
                    timer.cancel();
                    timer.purge();
                    textView.setText(R.string.hello_world);
                }
            }
        });
    }

    public void startTimer() {
        timer = new Timer();
        TimerTask timerTask = new TimerTask() {

            @Override
            public void run() {
                runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        textView.setText(String.format(Locale.getDefault(), "%d", time));
                        if (time > 0)
                            time -= 1;
                        else {
                            textView.setText(R.string.hello_world);
                            btnStart.setChecked(false);
                        }
                    }
                });
            }
        };
        timer.scheduleAtFixedRate(timerTask, 0, 1000);
    }
}
And here is the activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.guna.testapplication.MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:text="@string/hello_world"
        android:textColor="@color/colorAccent"
        android:textSize="22sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/toggleButton"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_chainStyle="packed" />

    <ToggleButton
        android:id="@+id/toggleButton"
        style="@style/Widget.AppCompat.Button.Borderless"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="2dp"
        android:checked="false"
        android:textOff="@string/start"
        android:textOn="@string/stop"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />
</android.support.constraint.ConstraintLayout>
Screenshot:

Interesting right?


If you are really interested in this code, then please share this post with your friends and share your feedback as comments.



Thank You


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