android BroadcastReceiver(二)

普通广播（Normal Broadcast）

概念:普通广播对于多个接收者来说是完全异步的，通常每个接收者都无需等待即可以接收到广播，接收者相互之间不会有影响。对于这种广播，接收者无法终止广播，即无法阻止其他接收者的接收动作。(PS:就像说出去的话，别人都能听到~~~你也不能反悔，普通广播也有点这种意思。。。)
实现：
1、接收者，三个为例，如：

public class FirstReceiver extends BroadcastReceiver {      private static final String TAG = "hq";      @Override      public void onReceive(Context context, Intent intent) {            String msg = intent.getStringExtra("msg");            Log.i(TAG, "普通广播   FirstReceiver: " + msg +"----"+System.currentTimeMillis());      }  }  

2、注册广播

        firstReceiver = new FirstReceiver();        secondReceiver = new SecondReceiver();        thirdReceiver = new ThirdReceiver();        IntentFilter filter = new IntentFilter();        filter.addAction("android.intent.action.MY_INORDER_BROADCAST");        registerReceiver(firstReceiver, filter);        registerReceiver(secondReceiver, filter);        registerReceiver(thirdReceiver, filter);

3、发送广播
android.intent.action.MY_INORDER_BROADCAST:自己定义的广播地址，先把它当成简单的字符串吧，要和接收广播地址相同，才能收到

Intent intent = new Intent("android.intent.action.MY_INORDER_BROADCAST");        intent.putExtra("msg", "学习中==");        sendBroadcast(intent, "scott.permission.MY_BROADCAST_PERMISSION");

4、结果

5、验证取消广播实验：在接收者中取消。（注：普通广播是无法取消的！）

public class FirstReceiver extends BroadcastReceiver {      private static final String TAG = "hq";      @Override      public void onReceive(Context context, Intent intent) {            String msg = intent.getStringExtra("msg");            abortBroadcast();            Log.i(TAG, "普通广播   FirstReceiver: " + msg +"----"+System.currentTimeMillis());      }  }  

再次发送广播

    Intent intent = new Intent("android.intent.action.MY_INORDER_BROADCAST");        intent.putExtra("msg", "学习中==");        sendOrderedBroadcast(intent, "scott.permission.MY_BROADCAST_PERMISSION");

结果：

WHY？

怎么只显示一条广播的？预测中是三条都显示得。。。这时候才发现，原来命令发错了。。。是sendBroadcast，我写成了sendOrderedBroadcast。。。不过也验证了有序广播是可以取消的~~~
备注：有序广播需要加权限：

有序广播

实现：
1、接收者

public class FirstReceiver extends BroadcastReceiver {      private static final String TAG = "hq";      @Override      public void onReceive(Context context, Intent intent) {          String msg = intent.getStringExtra("msg");          Log.i(TAG, "有序广播  FirstReceiver: " + msg);          Bundle bundle = new Bundle();          //接收到消息后，对其编辑重新发送出去        bundle.putString("msg", msg + "被FirstReceiver编辑过-");          setResultExtras(bundle);      }  }  

public class SecondReceiver extends BroadcastReceiver {    private static final String TAG = "hq";    @Override    public void onReceive(Context context, Intent intent) {        String msg = getResultExtras(true).getString("msg");        Log.i(TAG, "有序广播  SecondReceiver: " + msg);        Bundle bundle = new Bundle();        bundle.putString("msg", msg + "被SecondReceiver编辑过-");        setResultExtras(bundle);        // abortBroadcast(); //添加这句receiver3就接收不到    }}

public class ThirdReceiver extends BroadcastReceiver {      private static final String TAG = "hq";      @Override      public void onReceive(Context context, Intent intent) {          String msg = getResultExtras(true).getString("msg");          Log.i(TAG, "有序广播  ThirdReceiver: " + msg);      }  }  

2、注册广播

    <receiver android:name="com.hq.demo.order.disorder.FirstReceiver" >        <intent-filter android:priority="1000" >            <action android:name="android.intent.action.MY_ORDER_BROADCAST" />            <category android:name="android.intent.category.DEFAULT" />        </intent-filter>    </receiver>    <receiver android:name="com.hq.demo.order.disorder.SecondReceiver" >        <intent-filter android:priority="999" >            <action android:name="android.intent.action.MY_ORDER_BROADCAST" />            <category android:name="android.intent.category.DEFAULT" />        </intent-filter>    </receiver><receiver android:name ="com.hq.demo.order.disorder.ThirdReceiver" >        <intent-filter android:priority="997" >            <action android:name="android.intent.action.MY_ORDER_BROADCAST" />            <category android:name="android.intent.category.DEFAULT" />        </intent-filter>    </receiver>

3、发送广播

Intent intent = new Intent("android.intent.action.MY_ORDER_BROADCAST");        intent.putExtra("msg", "消息.");        sendOrderedBroadcast(intent, "scott.permission.MY_BROADCAST_PERMISSION");

4、结果：

5、有序广播终止，例：在SecondReceiver 添加abortBroadcast();ThirdReceiver 就接收不到消息了。