android studio 接收系统广播

在BasicActivity的OptionMenu中添加三个Item:”发送标准广播”和”发送有序广播”，“截
断的有序广播”点击它们分别发送标准广播和有序广播。

注意：需要先在文件中注册：

<receiver
            android:name=".xryBroadReceiver1"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.example.broadcasttest.MY_BROADCAST"/>
            </intent-filter>
        </receiver>
        <receiver
            android:name=".xryBroadReceiver2"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.example.broadcasttest.MY_BROADCAST" />
            </intent-filter>
        </receiver>
        <receiver
            android:name=".xryBroadReceiver3"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.example.broadcasttest.MY_BROADCAST2" />
            </intent-filter>
        </receiver>
        <receiver
            android:name=".xryBroadReceiver4"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.example.broadcasttest.MY_BROADCAST2" />
            </intent-filter>
        </receiver>

Mainactivity：

class MainActivity : AppCompatActivity() {
    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        menuInflater.inflate(R.menu.menu_main, menu)
        return true
    }
    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            R.id.send1 -> {
                val intent = Intent("com.example.broadcasttest.MY_BROADCAST")
                intent.setPackage(packageName)
                sendBroadcast(intent)
            }
            R.id.send2 -> {
                val intent = Intent("com.example.broadcasttest.MY_BROADCAST2")
                intent.setPackage(packageName)
                intent.putExtra("message","0")
                sendOrderedBroadcast(intent,null)
            }
            R.id.send3 -> {
                val intent = Intent("com.example.broadcasttest.MY_BROADCAST2")
                intent.setPackage(packageName)
                intent.putExtra("message","1")
                sendOrderedBroadcast(intent,null)
            }
        }
        return true
    }

}

BroadReceiver：

class xryBroadReceiver1 : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        Toast.makeText(context, "自定义的广播接受者01，接受到了标准广播事件",
            Toast.LENGTH_SHORT).show()
    }
}

class xryBroadReceiver2: BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        Toast.makeText(context, "自定义的广播接受者02，接受到了标准广播事件",
            Toast.LENGTH_SHORT).show()
    }
}

class xryBroadReceiver3 : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        Toast.makeText(context, "自定义的广播接受者03，接受到了有序广播事件",
            Toast.LENGTH_SHORT).show()
        if (intent.getStringExtra("message").equals("1")){
            abortBroadcast()
        }
    }
}

class xryBroadReceiver4 : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        Toast.makeText(context, "自定义的广播接受者04，接受到了有序广播事件",
            Toast.LENGTH_SHORT).show()
    }
}

页面布局代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
</LinearLayout>