Android 蓝牙可见性开启与关闭
定制的Android设备只有在蓝牙页面才能被扫描搜索到,要求软件开启启动后作为服务端被蓝牙连接,且一直处于被发现状态。
最初尝试了下面的方法,但是有时间限制而且需要手动确认:
//启动修改蓝牙可见性的Intent
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
//设置蓝牙可见性的时间,方法本身规定最多可见300秒
intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(intent);
后来,发现调用反射方法开启蓝牙可见性,可以到达预期效果,如下:
public static void setDiscoverableTimeout() {
BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
try {
Method setDiscoverableTimeout = BluetoothAdapter.class.getMethod("setDiscoverableTimeout", int.class);
setDiscoverableTimeout.setAccessible(true);
Method setScanMode = BluetoothAdapter.class.getMethod("setScanMode", int.class, int.class);
setScanMode.setAccessible(true);
setDiscoverableTimeout.invoke(adapter, 0);
setScanMode.invoke(adapter, BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE, 0);
} catch (Exception e) {
e.printStackTrace();
Log.e("Bluetooth", "setDiscoverableTimeout failure:" + e.getMessage());
}
}
关闭可见性方法:
public static void closeDiscoverableTimeout() {
BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
try {
Method setDiscoverableTimeout = BluetoothAdapter.class.getMethod("setDiscoverableTimeout", int.class);
setDiscoverableTimeout.setAccessible(true);
Method setScanMode = BluetoothAdapter.class.getMethod("setScanMode", int.class, int.class);
setScanMode.setAccessible(true);
setDiscoverableTimeout.invoke(adapter, 1);
setScanMode.invoke(adapter, BluetoothAdapter.SCAN_MODE_CONNECTABLE, 1);
} catch (Exception e) {
e.printStackTrace();
}
}
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