Here is full source code to update the UI with every new minute
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.example.application.exampleapp.MainActivity">
<TextView
android:id="@+id/counter_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:textSize="60sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
MainActivity.java
package com.example.application.exampleapp;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private TextView counterText;
private BroadcastReceiver minuteUpdateReceiver;
private int counter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
counterText = (TextView) findViewById(R.id.counter_text);
}
public void startMinuteUpdater() {
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(Intent.ACTION_TIME_TICK);
minuteUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
counter++;
counterText.setText("" + counter);
}
};
registerReceiver(minuteUpdateReceiver, intentFilter);
}
@Override
protected void onResume() {
super.onResume();
startMinuteUpdater();
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(minuteUpdateReceiver);
}
}