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
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);
}
};
}
