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

<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>

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);
}

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);
}
}

*有序广播

<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>

public void send(View v){
Intent intent = new Intent();
intent.putExtra("name","王者");
intent.setAction("com.example.adminastrator.broadcastreceiver.MyBroadcastReceiver");
sendOrderedBroadcast(intent,null);
}

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");
}
}

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");
}
}

*自动回复短信

<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>

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);
}
}
}
}

* 外拨电话添加前缀

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);
}
}

* 监听网络状态

<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>

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");
}
}
}

*监听网络状态（动态注册）

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");
}
}
}

* 开机自启动

<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>

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);
}
}