BroadcastReceiver广播接受者

广播接收器的两种注册方式：

1)动态注册：在代码中注册，创建一个IntentFilter(意图过滤器)对象，设置想要就收的广播，在onCreate()方法中通过调用registerReceiver()方法来注册广播接收器，在onDestroy()方法中通过调用unregisterReceiver()方法来注销广播接收器。

2)静态注册：在AndroidManifest.xml文件中注册，<Receiver>标签注册类，通过<IntentFilter>标签中的<Action>来过滤意图。静态注册的好处是，当程序关闭或者没有打开的时候，同样可以接收相关的广播。比如实现开机启动

面试：生命周期

1）广播接受者的生命周期是非常短暂的，在接收到广播的时候创建，onReceive（）方法结束之后销毁

2）广播接受者中不要做一些耗时的工作，否则会弹出Application No Response错误对话框

3）最好也不要在广播接受者中创建子线程做耗时的工作，因为广播接受者被销毁后进程就成为了空进程，很容易被系统杀掉

4）耗时的较长的工作最好放在服务中完成

*无序广播

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<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver android:name=".MyBroadcastReceiver">
        <intent-filter>
            <action android:name="com.example.administrator.broadcastreceiver.MyBroadcastReceiver"></action>
        </intent-filter>
    </receiver>
</application>
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public void send(View v){
    Intent intent = new Intent();
    intent.putExtra("name","王者");
    intent.putExtra("age",27);
    intent.setAction("com.example.administrator.broadcastreceiver.MyBroadcastReceiver");
    sendBroadcast(intent);
}
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public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String name = intent.getStringExtra("name");
        int age = intent.getIntExtra("age",30);
        Log.i("Main",name+"--"+age);
    }
}
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*有序广播

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<application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".MyBroadcastReceiver1">
            <intent-filter android:priority="200">
                <action android:name="com.example.adminastrator.broadcastreceiver.MyBroadcastReceiver"></action>
            </intent-filter>
        </receiver>
        <receiver android:name=".MyBroadcastReceiver2">
            <intent-filter android:priority="100">
                <action android:name="com.example.adminastrator.broadcastreceiver.MyBroadcastReceiver"></action>
            </intent-filter>
        </receiver>
    </application>
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public void send(View v){
        Intent intent = new Intent();
        intent.putExtra("name","王者");
        intent.setAction("com.example.adminastrator.broadcastreceiver.MyBroadcastReceiver");
        sendOrderedBroadcast(intent,null);
    }
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public class MyBroadcastReceiver1 extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String name = intent.getStringExtra("name");
       // abortBroadcast();   //拦截广播
        setResultData("哈哈");    //发送给优先级低的程序
        Log.i("Main",name+"----1");
    }
}
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public class MyBroadcastReceiver2 extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String name = intent.getStringExtra("name");
        String data = getResultData();
        Log.i("Main",name+"-"+data+"----2");
    }
}
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 *自动回复短信

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<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>
    <uses-permission android:name="android.permission.RECEIVE_SMS"/>
    <uses-permission android:name="android.permission.SEND_SMS"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.broadcastReceiver.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>
        <receiver android:name="com.example.broadcastReceiver.MyReceiver">
            <intent-filter android:priority="500">
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            </intent-filter>
        </receiver>
    </application>
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public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        System.out.println("有短信来了");
        Bundle bundle = intent.getExtras();
        Object[] objs = (Object[]) bundle.get("pdus");
        for (Object obj : objs) {
            SmsMessage sms = SmsMessage.createFromPdu((byte[]) obj);
            String str = sms.getMessageBody();
            String phone = sms.getOriginatingAddress();
            Log.i("aaaaaaaaaaaa", phone+":"+str);
            if("114".equals(phone)){
                SmsManager manager = SmsManager.getDefault();
                manager.sendTextMessage(phone, null, "fuck you", null, null);
            }
        }
    }
}
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 * 外拨电话添加前缀

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public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        //收到外拨电话。
      String phone =   getResultData();
      String name =   intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
        setResultData("10193"+phone);
        System.out.println("有外拨电话");
        Log.i("Main",phone);
    }
}
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 * 监听网络状态

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<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver android:name=".MyReceiver">
        <intent-filter android:priority="100">
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE"></action>
        </intent-filter>
    </receiver>
</application>
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public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Service.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if(networkInfo == null || !networkInfo.isConnected()){
            Log.i("Main","没有网络");
        }else{
            Log.i("Main","有网络");
        }
    }
}
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*监听网络状态（动态注册）

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private MyReceiver myReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    myReceiver = new MyReceiver();
}

@Override
protected void onResume() {
    super.onResume();
    IntentFilter filter = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
    registerReceiver(myReceiver,filter);
}

@Override
protected void onDestroy() {
    super.onDestroy();
    unregisterReceiver(myReceiver);
}

class MyReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Service.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        if(networkInfo == null||!networkInfo.isConnected()){
            Log.i("Main","没有网络");
        }else{
            Log.i("Main","有网络");
        }
    }
}
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* 开机自启动

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<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver android:name=".MyBroadcastReceiver">
        <intent-filter >
            <action android:name="android.intent.action.BOOT_COMPLETED"></action>
        </intent-filter>
    </receiver>
</application> 
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public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent intent1 = new Intent();
        intent1.setClass(context,MainActivity.class);
        intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent1);
    }
}
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