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andriod 蓝牙开发之蓝牙搜索
蓝牙的搜索是通过广播来实现的。关键代码如下：
1、用于发现蓝牙的广播接受者
/**
* 接收器
* 当搜索蓝牙设备完成时调用
*/
private BroadcastReceiver _foundReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
//将结果添加到列表中
_devices.add(device);
DeviceInfo info=new DeviceInfo();
info.setmDeviceName(device.getName());
info.setmDeviceMacAddr(device.getAddress());
infos.add(info);
info=null;
// 显示列表
showDevices();
}
};private BroadcastReceiver _discoveryReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent)
{
// 卸载注册的接收器
unregisterReceiver(_foundReceiver);
unregisterReceiver(this);
_discoveryFinished = true;
}
};2、获得蓝牙适配器
_bluetooth=BluetoothAdapter.getDefaultAdapter();
//判断设备是否支持蓝牙
if(_bluetooth==null){
Toast.makeText(getApplicationContext(),"当前设备不支持蓝牙", 300).show();
return;
}
//判断蓝牙是否打开
if(!_bluetooth.isEnabled()){
//请求开启蓝牙
Intent intent=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
// 设置蓝牙可见性，最多300秒
// intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(intent);3、注册接收器
//注册接收器
IntentFilter discoveryFilter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(_discoveryReceiver, discoveryFilter);
IntentFilter foundFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(_foundReceiver, foundFilter);
// 显示一个对话框,正在搜索蓝牙设备
SamplesUtils.indeterminate(DiscoveryActivity.this, _handler, "蓝牙设备搜索中...", _discoveryWorkder, new OnDismissListener() {
public void onDismiss(DialogInterface dialog)
{
for (; _bluetooth.isDiscovering();)
{
_bluetooth.cancelDiscovery();
}
_discoveryFinished = true;
}
}, false); if (list.indexOf(s) == -1) {// 防止重复
list.add(s);工具类如下：
class SamplesUtils
{
public static void indeterminate(Context context, Handler handler, String message, final Runnable runnable, OnDismissListener dismissListener)
{
try
{
indeterminateInternal(context, handler, message, runnable, dismissListener, true);
}
catch (Exception e)
{
; // nop.
}
}
public static void indeterminate(Context context, Handler handler, String message, final Runnable runnable, OnDismissListener dismissListener,
boolean cancelable)
{
try
{
indeterminateInternal(context, handler, message, runnable, dismissListener, cancelable);
}
catch (Exception e)
{
; // nop.
}
}
private static ProgressDialog createProgressDialog(Context context, String message)
{
ProgressDialog dialog = new ProgressDialog(context);
dialog.setIndeterminate(false);
dialog.setMessage(message);
return dialog;
}
private static void indeterminateInternal(Context context, final Handler handler, String message, final Runnable runnable,
OnDismissListener dismissListener, boolean cancelable)
{
final ProgressDialog dialog = createProgressDialog(context, message);
dialog.setCancelable(cancelable);
if (dismissListener != null)
{
dialog.setOnDismissListener(dismissListener);
}
dialog.show();
new Thread() {
@Override
public void run()
{
runnable.run();
handler.post(new Runnable() {
public void run()
{
try
{
dialog.dismiss();
}
catch (Exception e)
{
; // nop.
}
}
});
};
}.start();
}
}
andriod 蓝牙开发之蓝牙搜索
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