目标:构建一个Android应用程序,用于发现范围内BT设备的名称和地址并将其值提交给web服务。 BT设备以前没有被绑定到主机设备,我只是想在我走过的时候轮询一切。Android中的蓝牙设备发现 - startDiscovery()
我所做的:
- 看了又看文档。
- 实施主机设备的BT适配器的本地实例。
- 如果未启用,则实施通知以启用BT。
- 注册广播接收器和意图解析
ACTION_FOUNDs
来自startDiscovery()。 - 注册BLUETOOTH和BLUETOOTH_ADMIN清单中的权限。
事情工作(如增量控制台日志记录测试)直到startDiscovery()
。
无奈:
- startDiscovery() - 我怀疑我传递这在错误的上下文。这种方法需要放在什么上下文才能正常工作?
如果你已经能够得到这个方法的工作,我会非常感谢你的智慧。
UPDATE - 这是简化版本的代码,这让我很悲伤;这种简化重演了我的错误。此代码运行,它不会抛出cat.log
错误或其他错误,它根本不会给出任何输出。
package aqu.bttest;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.widget.Toast;
public class BT2Activity extends Activity {
private BluetoothAdapter mBTA;
private SingBroadcastReceiver mReceiver;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//register local BT adapter
mBTA = BluetoothAdapter.getDefaultAdapter();
//check to see if there is BT on the Android device at all
if (mBTA == null){
int duration = Toast.LENGTH_SHORT;
Toast.makeText(this, "No Bluetooth on this handset", duration).show();
}
//let's make the user enable BT if it isn't already
if (!mBTA.isEnabled()){
Intent enableBT = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBT, 0xDEADBEEF);
}
//cancel any prior BT device discovery
if (mBTA.isDiscovering()){
mBTA.cancelDiscovery();
}
//re-start discovery
mBTA.startDiscovery();
//let's make a broadcast receiver to register our things
mReceiver = new SingBroadcastReceiver();
IntentFilter ifilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(mReceiver, ifilter);
}
private class SingBroadcastReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction(); //may need to chain this to a recognizing function
if (BluetoothDevice.ACTION_FOUND.equals(action)){
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a Toast
String derp = device.getName() + " - " + device.getAddress();
Toast.makeText(context, derp, Toast.LENGTH_LONG);
}
}
}
}
这将有助于了解您所得到的错误......或者至少是什么让您相信'startDiscovery()'运行不正常。 –