Android之BroadcastReceiver的用法
来源:互联网 发布:火焰之地怎么去乎门人 编辑:程序博客网 时间:2024/06/08 14:27
BroadcastReceiver为Android的四大组件之一,用于接收系统或自定义的广播事件。以下使用Android自带示例BluetoothChat说明其用法。在该示例中,应用接收系统发送的蓝牙设备发现广播和设备发现完成广播。当然也可以加入对其他广播事件的注册及其处理。使用分为两步:
1. 注册广播接收器
// Register for broadcasts when a device is discovered
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(mReceiver, filter);
// Register for broadcasts when discovery has finished
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(mReceiver, filter);
2. 定义广播接收器,重写onReceive方法
// The BroadcastReceiver that listens for discovered devices and
// changes the title when discovery is finished
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// If it's already paired, skip it, because it's been listed already
if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
}
// When discovery is finished, change the Activity title
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
setProgressBarIndeterminateVisibility(false);
setTitle(R.string.select_device);
if (mNewDevicesArrayAdapter.getCount() == 0) {
String noDevices = getResources().getText(R.string.none_found).toString();
mNewDevicesArrayAdapter.add(noDevices);
}
}
}
};
- Android之BroadcastReceiver的用法
- Android-BroadcastReceiver广播的用法
- android之BroadcastReceiver的使用
- Android之BroadcastReceiver的使用
- Android之BroadcastReceiver的使用
- Android之BroadcastReceiver的使用
- Android之BroadcastReceiver的使用
- Android应用开发中BroadcastReceiver的用法
- android----广播(BroadcastReceiver)的用法
- Android系统的四大组件之:BroadcastReceiver
- Android学习之BroadCastReceiver的机制
- Android的四大组件之BroadcastReceiver
- Android四大组件之BroadcastReceiver的使用
- 浅谈BroadcastReceiver的用法
- 浅谈BroadcastReceiver的用法
- Android之Intent&BroadcastReceiver
- Android之Service&BroadCastReceiver
- Android之BroadcastReceiver
- python 扫描目录下所有文件并读取文件
- MFC多线程的简单实现
- Unity3d的ios插件开发
- Makefile的obj-y和obj-m语句
- Unity3d选择本地图片并加载
- Android之BroadcastReceiver的用法
- python的多线程简单实例理解
- JavaScript中的dom编程
- SSH:Hibernate框架(Hibernate集合Map关系映射)
- Mybatis逆向工程
- 性能分析工具Eclipse Memory Analyzer tool(MAT)
- 学习笔记之递归和分治思想
- 内存泄露入门之基础知识篇
- Java 选择排序 (Selection Sort)