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Android to make Delay and Repeat Code Execution with Handler PostDelayed

Posted on November 25, 2021 By christo No Comments on Android to make Delay and Repeat Code Execution with Handler PostDelayed

Full source code to execute a piece of code by passing a Runnable to a Handler’s postDelayed method. We will also make this Runnable repeat itself and stop it on button click by calling removeCallbacks on our Handler

Table of Contents

  • activity_main.xml
  • MainActivity.java

activity_main.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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    tools:context="tech.codingpoint.handlerpostdelayedexample.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="startRepeating"
        android:text="start repeating" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="stopRepeating"
        android:text="stop repeating" />

</LinearLayout>

MainActivity.java

package tech.codingpoint.handlerpostdelayedexample;

import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Handler mHandler = new Handler();

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

    public void startRepeating(View v) {
        //mHandler.postDelayed(mToastRunnable, 5000);
        mToastRunnable.run();
    }

    public void stopRepeating(View v) {
        mHandler.removeCallbacks(mToastRunnable);
    }

    private Runnable mToastRunnable = new Runnable() {
        @Override
        public void run() {
            Toast.makeText(MainActivity.this, "This is a delayed toast", Toast.LENGTH_SHORT).show();
            mHandler.postDelayed(this, 5000);
        }
    };
}
android Tags:Android, PostDelayed

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