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VOOZH | about |
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VOOZH | about |
Broadcast in android is the system-wide events that can occur when the device starts, when a message is received on the device or when incoming calls are received, or when a device goes to airplane mode, etc. Broadcast Receivers are used to respond to these system-wide events. Broadcast Receivers allow us to register for the system and application events, and when that event happens, then the register receivers get notified. There are mainly two types of Broadcast Receivers:
Since from API Level 26, most of the broadcast can only be caught by the dynamic receiver, so we have implemented dynamic receivers in our sample project given below. There are some static fields defined in the Intent class which can be used to broadcast different events. We have taken a change of airplane mode as a broadcast event, but there are many events for which broadcast register can be used. Following are some of the important system-wide generated intents:-
Intent | Description Of Event |
|---|---|
| android.intent.action.BATTERY_LOW : | Indicates low battery condition on the device. |
| android.intent.action.BOOT_COMPLETED | This is broadcast once after the system has finished booting |
| android.intent.action.CALL | To perform a call to someone specified by the data |
| android.intent.action.DATE_CHANGED | Indicates that the date has changed |
| android.intent.action.REBOOT | Indicates that the device has been a reboot |
| android.net.conn.CONNECTIVITY_CHANGE | The mobile network or wifi connection is changed(or reset) |
| android.intent.ACTION_AIRPLANE_MODE_CHANGED | This indicates that airplane mode has been switched on or off. |
The two main things that we have to do in order to use the broadcast receiver in our application are:
Creating the Broadcast Receiver:
class AirplaneModeChangeReceiver:BroadcastReceiver() {
override fun onReceive(context: Context?, intent: Intent?) {
// logic of the code needs to be written here
}
}
Registering a BroadcastReceiver:
IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED).also {
// receiver is the broadcast receiver that we have registered
// and it is the intent filter that we have created
registerReceiver(receiver,it)
}
Below is the sample project showing how to create the broadcast Receiver and how to register them for a particular event and how to use them in the application.
Step 1: Create a New Project
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio .
Step 2: Working with the activity_main.xml file
Go to the activity_main.xml file and refer to the following code. Below is the code for the activity_main.xml file.
Step 3: Working with the MainActivity file
Go to the MainActivity file and refer to the following code. Below is the code for the MainActivity file. Comments are added inside the code to understand the code in more detail.
Step 4: Create a new class
Go to app > java > your package name(in which the MainActicity is present) > right-click > New > Kotlin File/Class and name the files as AirplaneModeChangeReceiver . Below is the code for the AirplaneModeChangeReceiver file. Comments are added inside the code to understand the code in more detail.
Output:
