In-depth understanding of the local radio manager's technical principles in the Android support library

In -depth understanding of the technical principles of the local radio manager in the Android support library Android's Local Broadcast Manager is a powerful tool in the Android support library. It provides a lightweight way to send and receive broadcast messages inside the application.The local broadcast manager is safer and efficient than the Global Broadcast Manager. It only sends the broadcast event to the internal receiver of the application without leaking it to other applications. This article will explore the technical principles of the local broadcast manager in the Android support library and provide some Java code examples to help understand. 1. The working principle of the local broadcast manager The working principle of local broadcasting managers is relatively simple.When an internal component (such as Activity, Service, etc.) sends a local broadcast, the local broadcast manager is responsible for notifying the broadcast event to the receiver registered in the same application. The following is the main principle of the local broadcast manager: 1. Create an instance of a local broadcast manager: To obtain a singles instance of the local broadcast manager through LocalBroadCastManager.Getinstance (Context) method. 2. Registered broadcast recipient: Call the broadcast receiver to the local broadcast manager by calling the registerReceiver (BroadcastReceiver, IntentFilter) method. 3. Send local broadcasting: Send local broadcast by calling SendbroidCast (INTENT) or SendbroidSync (INTENT) method. 4. Receive broadcast: Registered broadcast receivers will receive matching broadcast events. Second, the advantages of the local broadcast manager Compared to the global broadcast manager, the local broadcast manager has the following main advantages: 1. Safety: Global broadcasting can be accepted by other applications, which may lead to security loopholes.The local broadcast is only sent and received inside the application, and the security is higher. 2. Efficiency: Global broadcasting needs to scan and filter all applications, and local broadcasts only need to scan and filter inside the application to perform higher execution efficiency. 3. Flexibility: Local broadcasting managers only pay attention to radio events within the application, so it is easier to integrate and manage. 3. Java code example of the local broadcast manager The following is a simple Java code example, which shows how to use the local broadcast manager to send and receive broadcast events in the application: 1. Registered broadcast receiver: private BroadcastReceiver myReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { // Treatment the receiving broadcast event } }; // Register a broadcast receiver in the onCreate method @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LocalBroadcastManager.getInstance(this).registerReceiver(myReceiver, new IntentFilter("myAction")); } // Cancel the registered broadcast receiver in the ONDESTROY method @Override protected void onDestroy() { super.onDestroy(); LocalBroadcastManager.getInstance(this).unregisterReceiver(myReceiver); } 2. Send local broadcast: // Create an INTENT object and set the broadcast of ACTION Intent intent = new Intent("myAction"); // Send local broadcast LocalBroadcastManager.getInstance(this).sendBroadcast(intent); Through the above examples, we can see that the usage of local broadcasting managers is very simple and intuitive. in conclusion The local broadcast manager is a powerful tool in the Android support library that can safely and efficiently send and receive broadcast events inside the application.Compared with the global broadcast manager, the local broadcast manager provides better security, efficiency and flexibility.We hope that this article can help readers understand the technical principles of local broadcasting managers in depth and apply flexibly in actual development.