[embedyt] https://www.youtube.com/watch?v=hXWVaAyXkoQ[/embedyt]
activity_main.xmlMainActivity.java
<?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>
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); } }