The Android support library local radio manager in the Java class library is an efficient broadcast mechanism that is used to send and receive local broadcasts inside the application.This article will analyze the technical principles of this radio manager in depth. First of all, we need to know what local broadcast is.In Android, the broadcast mechanism is an important way to communicate between components.Generally, we can use a global broadcast manager to send and receive broadcasts, but the consumption resources of the global broadcast mechanism are large, especially when sending broadcasts, all applications will receive the broadcast, which may cause unnecessary performance loss. The local radio manager in the Android support library provides a way to perform local broadcasting inside the application.It is only used to communicate between components inside the application, so it will not be sent to other applications.This method can improve performance and security. So, how is the local broadcast manager achieved?Its core is the combination of handler and receiver. First, we need to create a broadcast receiver class to receive and process broadcast messages.This class needs to inherit from the BroadcastReceiver and implement the onReceive () method.In this method, we can handle accordingly according to the receiving broadcast messages. Next, we need to create a handler object to process broadcast messages in the main thread.This handler object can be created by instantiated a Handler class in the main thread. Then we need to create a local broadcast manager instance.You can obtain a local radio manager object by calling the getinstance () method of LocalBroidCastManager. Next, we need to use the local radio manager object to register the target we created.You can register by calling LocalBroidCastManager () of the registerReceiver () method of LocalBroidCastManager. Now, we can send local broadcasts.You can send a broadcast by calling the SendBroidcast () method of LocalBroidCastManager to send a broadcast.We can use the INTENT object to describe the broadcast messages we want to send. Finally, when we no longer need to receive broadcasts, we need to cancel the registered broadcast receiver.You can cancel the registration by calling the unregisterReceiver () method of LocalBroidCastManager. The following is an example code: // Create a radio receiver class public class MyReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { // Process the receiving broadcast message } } // Create a handler object in the main thread Handler handler = new Handler(Looper.getMainLooper()) { @Override public void handleMessage(Message msg) { // Process the broadcast message received in the main thread } }; // Create a local broadcast manager example LocalBroadcastManager localBroadcastManager = LocalBroadcastManager.getInstance(context); // Register a broadcast receiver localBroadcastManager.registerReceiver(myReceiver, new IntentFilter("com.example.MY_ACTION")); // Send local broadcast localBroadcastManager.sendBroadcast(new Intent("com.example.MY_ACTION")); // Cancel the registered broadcast receiver localBroadcastManager.unregisterReceiver(myReceiver); In summary, the local radio manager in the Android support libraries can achieve an efficient local broadcast mechanism by using the combination of handler and Receiver.It is only used to communicate between components inside the application and provides the advantages of performance and security.Using a local broadcast manager, we can easily send and receive broadcast messages within the application.