android BroadCastReceiver

对BroadCastReceiver注册分为代码注册和清单文件注册,在活动中代码注册,当活动销毁时,BroadCastReceiver也会失去作用,而在清单文件中注册BroadCastReceiver则会一直存在,并起作用.

清单文件注册:

<receiver android:name=".MessageReceiver">
            <intent-filter android:priority="1000">
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            </intent-filter>
</receiver>

 代码注册:

BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {

            }
        };
        String action = "XXX";
        IntentFilter intentFilter = new IntentFilter(action);
        registerReceiver(broadcastReceiver,intentFilter);

 发送一条广播:

//与之前BroadCastReceiver注册的action相匹配
        String action ="XXX";
        Intent intent = new Intent(action);
        //发送无须广播,广播不能被终止
        sendBroadcast(intent);
        //发送有序广播,广播根据优先级大小依次执行,可以用abortBroadcast终止,第三个参数时指定的广播接收者,当广播
        //终止时它依然可以接受广播
        sendOrderedBroadcast(intent,null,null,null,0,null,null);