目标：构建一个 Android 应用程序，发现范围内的 BT 设备的名称和地址，并将其值提交给 Web 服务。BT 设备之前没有绑定到主机设备，我只想在走动时轮询所有内容。
我做了什么：
- 仔细阅读文档。
- 实现了主机设备的 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来解析startDiscovery()
ACTION_FOUNDs的到来。 - 在清单中注册了BLUETOOTH和BLUETOOTH_ADMIN权限。
直到startDiscovery().
挫折：
- startDiscovery() - 我怀疑我在错误的上下文中传递了这个。此方法需要放置在什么上下文中才能正常运行？
如果您能够使这种方法发挥作用，我将非常感谢您的智慧。
更新- 这是导致我悲伤的代码的精简版；这种简化概括了我的错误。这段代码运行，它没有抛出cat.log错误或其他错误，它根本没有给出任何输出。
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);
}
}
}
}