求助大神，安卓中的蓝牙调用，broadcastReceiver中的onReceive函数怎么都不执行

最新推荐文章于 2022-02-14 16:24:40 发布

wwwww_zhuwang

最新推荐文章于 2022-02-14 16:24:40 发布

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本文链接：https://blog.youkuaiyun.com/wwwww_zhuwang/article/details/80777886

本文主要探讨在Android应用中遇到的蓝牙BroadcastReceiver的onReceive方法未执行的问题。通过分析MainActivity的代码，展示了如何初始化蓝牙适配器、注册广播接收器以及处理蓝牙设备发现的相关操作。当点击扫描按钮启动设备发现时，预期onReceive会接收到ACTION_FOUND、ACTION_DISCOVERY_STARTED和ACTION_DISCOVERY_FINISHED等广播，但实际中并未触发，提示开发者检查注册过滤器和蓝牙状态。

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public class MainActivity extends Activity {

private BluetoothAdapter bla;
StringBuilder mess;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bla = BluetoothAdapter.getDefaultAdapter();
        mess = new StringBuilder();
        MyReceiver receiver = new MyReceiver();
        final TextView messageField = (TextView) findViewById(R.id.mes);
  IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
  this.registerReceiver(receiver, filter);
        findViewById(R.id.open).setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    if(!bla.isEnabled()){
        bla.enable();
      }
   }
  });
        findViewById(R.id.close).setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
      if(bla.isEnabled()){
        bla.disable();
      }
   }
  });
        findViewById(R.id.scan).setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    bla.startDiscovery();
   }
  });
        findViewById(R.id.display).setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
     // TODO Auto-generated method stub
     messageField.setText(mess.toString());
    }
   });
    }
    public class MyReceiver extends BroadcastReceiver{

   @Override
   public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    Toast.makeText(getApplicationContext(), "555555", Toast.LENGTH_SHORT).show();
    String action = intent.getAction();
    if(BluetoothDevice.ACTION_FOUND.equals(action)){
     BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
     mess.append(device.getName());
     mess.append("       ");
     mess.append(device.getAddress());
     mess.append("\n");
    }else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
                 Toast.makeText(MainActivity.this,"开始搜索",Toast.LENGTH_SHORT).show();
             } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                 Toast.makeText(MainActivity.this,"搜索完毕",Toast.LENGTH_SHORT).show();
             }
   }
}
     }