Overview of broadcastreceiver in Android

In Android, broadcastreceiver is used to dynamically register broastcastreceiver and statically register broastcastreceiver.

1. dynamically register broastcastreceiver.

Define broadcastreceiver:

Private broadcastreceiver bcr1 = new broadcastreceiver () {@ overridepublic void onreceive (context, intent) {// todo auto-generated method stub string action = intent. getaction (); toast. maketext (context, "dynamic:" + action, 1000 ). show ();}};

Register registerreceiver (bcr1, new intentfilter (action_1). The Code is as follows. The key code is to register the code registerreceiver (bcr1, new intentfilter (action_1). Others are simple buttons and bound click events.

 Button btn1,btn2,btn3;   static final String ACTION_1 = "com.example.broadcastreceiverdemo.ACTION_1";   static final String ACTION_2 = "com.example.broadcastreceiverdemo.ACTION_2";   static final String ACTION_3 = "com.example.broadcastreceiverdemo.ACTION_3";  @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn1 = (Button)this.findViewById(R.id.button1);btn1.setOnClickListener(new ClickEvent());btn2 = (Button)this.findViewById(R.id.button2);btn2.setOnClickListener(new ClickEvent());btn3 = (Button)this.findViewById(R.id.button3);btn3.setOnClickListener(new ClickEvent());registerReceiver(bcr1, new IntentFilter(ACTION_1));}

Send Broadcast

  class ClickEvent implements OnClickListener {  @Override  public void onClick(View v) {  // TODO Auto-generated method stub  if(v == btn1)  {  Intent intent = new Intent(ACTION_1);  sendBroadcast(intent);  }  if(v == btn2)  {  Intent intent = new Intent(ACTION_2);  sendBroadcast(intent);  }  if(v == btn3)  {  IntentFilter filter = new IntentFilter();  filter.addAction(Intent.ACTION_BATTERY_LOW);  filter.addAction(ACTION_3);    registerReceiver(bcr2, new IntentFilter(ACTION_3));    Intent intent = new Intent(ACTION_3);  intent.putExtra("Conuntry", "China");  intent.putExtra("City", "ShangHai");  sendBroadcast(intent);  }  }

V = btn1 is the broadcastreceiver that is sent to the internal dynamic registration;

V = btn2 is the broadcastreceiver sent to the internal static registration;

V = btn3 dynamically registers broadcastreceiver to the system-level internal registration (Bt1 and bt3 are basically the same, but addaction and intent putextra are slightly added );

 

2Static registration of broastcastreceiver. Static registration is more annoying. You must register in androidmanifest. xml.

    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <receiver android:name="cls2">            <intent-filter>                <action android:name="com.example.broadcastreceiverdemo.ACTION_2"></action>            </intent-filter>        </receiver>        <activity            android:name="com.example.broadcastreceiverdemo.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>

And implement a class to inherit broadcastreceiver

Public class cls2 extends broadcastreceiver {@ overridepublic void onreceive (context, intent) {// todo auto-generated method stubstring action = intent. getaction (); toast. maketext (context, "static:" + action, 1000 ). show ();}}