Android (Java) Learning Note 178: Customizing broadcasts

Broadcast using:
Radio: Send signals externally. Broadcast Radio--------- Radio (customizable)
Radio: A signal to receive a radio station. ----- Broadcast Recipients

Here, we explain the custom stations and build our own radio broadcasts :

1. First we write our own radio Android program, build the radio, as follows:

(1) The first is the layout file, Activity_main.xml file:

<Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Tools:context=". Mainactivity " >    <ButtonAndroid:onclick= "click"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_centerhorizontal= "true"android:layout_centervertical= "true"Android:text= "Send Broadcast" /></Relativelayout>

(2) Define a method for the button above click, here we directly implement it, click the button to send the broadcast:

The Mainactivity.java code is as follows:

 PackageCom.itheima.sender;Importandroid.app.Activity;Importandroid.content.Intent;ImportAndroid.net.Uri;ImportAndroid.os.Bundle;ImportAndroid.view.View; Public classMainactivityextendsActivity {@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);    Setcontentview (R.layout.activity_main); }        //Send broadcast     Public voidClick (View view) {
Intent Intent=NewIntent (); Intent.setaction ("Com.itheima.sender.CCTV"); Intent.setdata (Uri.parse ("cctv://the whole country up and down a piece of red"));    Sendbroadcast (Intent); }}

using intent to send data , the action action here is: the string "Com.itheima.sender.CCTV", which is custom.
Here is the setting data:intent.setdata (Uri.parse ("cctv://National Red")); Here the custom settings data is the Uri type, the data at the beginning of the keyword is:CCTV

You don't have to set any permissions here.

2. It is necessary to set up a radio receiver so that we can hear the broadcast, and then we will write a broadcast receiver Android program that listens to the custom broadcast above:

(1) The first step is to buy a radio, write mybroadcastreceiver inherit from Broadcastreceiver:

 PackageCom.itheima.receiver;ImportAndroid.content.BroadcastReceiver;ImportAndroid.content.Context;Importandroid.content.Intent;ImportAndroid.widget.Toast; Public classMybroadcastreceiverextendsBroadcastreceiver {@Override Public voidOnReceive (Context context, Intent Intent) {toast.maketext (context,"I am a civil servant, I received the broadcast of the Organization" +intent.getdata (), 0). Show (); }}

(2) The second and third steps are: install the battery and adjust the channel :

Add Receiver node content under the application node of the Androidmanifest.xml configuration file:

<?XML version= "1.0" encoding= "Utf-8"?><Manifestxmlns:android= "Http://schemas.android.com/apk/res/android" Package= "Com.itheima.receiver"Android:versioncode= "1"Android:versionname= "1.0" >    <USES-SDKandroid:minsdkversion= "8"android:targetsdkversion= "+" />    <ApplicationAndroid:allowbackup= "true"Android:icon= "@drawable/ic_launcher"Android:label= "@string/app_name"Android:theme= "@style/apptheme" >        <ActivityAndroid:name= "Com.itheima.receiver.MainActivity"Android:label= "@string/app_name" >            <Intent-filter>                <ActionAndroid:name= "Android.intent.action.MAIN" />                <categoryAndroid:name= "Android.intent.category.LAUNCHER" />            </Intent-filter>        </Activity>

        <receiverAndroid:name= "Com.itheima.receiver.MyBroadcastReceiver">            <Intent-filter>                <ActionAndroid:name= "com.itheima.sender.CCTV"/>                <DataAndroid:scheme= "CCTV" />            </Intent-filter>        </receiver  >

    </Application></Manifest>

The effect on the phone is as follows :

3. The above has set up the custom radio station and also prepared the corresponding broadcast receiver :

Let's look at the effect of the run, click on the button below:

The effect is as follows when you press the button:

This is the logical process of a complete custom station

Android (Java) Learning Note 178: Customizing broadcasts