Question

我目前正在尝试学习如何编写Android程序。我刚刚读完了“使用Android SDK构建Android应用程序的Android开发人员手册”一书。我试着编写以下代码：

Package src.com.cookbook.BlueToothSample;

    import android.app.Activity;
    import android.bluetooth.BluetoothAdapter;
    import android.bluetooth.BluetoothDevice;
    import android.content.BroadcastReceiver;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;

    public class BlueToothExampleActivity extends Activity
    {
        /** Called when the activity is first created. */
        @Override

        public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

            // button
            Button startBTButton = (Button) findViewById (R.id.Start_BT);
            startBTButton.setOnClickListener(new View.OnClickListener() 
            {



               @Override
             public void onClick(View v) 
             {
                     // TODO Auto-generated method stub
                 startBlueTooth();              
               }

            });

        }

        private void startBlueTooth()
        {
            Intent enableIntent = new Intent(BluetoothAdapter
            .ACTION_REQUEST_ENABLE);
        }

        private final BroadcastReceiver mReceiver = new BroadcastReceiver() 
        {
            public void onReceive(Context context, Intent intent)
              {
            String acton = intent.getAction();
            //When discovery finds a device
            if (BluetoothDevice.ACTION_FOUND.equals(action))
            {
                // Get the BluetoothDevice object from the Intent
                BluetoothDevice device = intent.getParcelableExtra(
                        BluetoothDevice.EXTRA_DEVICE);
                Log.v("BlueTooth Testing", device.getName() + '\n'
                        + device.getAddress());
            }


            }


        };

      // Register the BroadcastReceiver
         IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
         registerReceiver(mReceiver, filter);
         myBluetooth.startDiscover();

    }

我收到以下错误：语法错误，插入“}”以完成ClassBody。我以为我把所有支架排成一列。在阅读本论坛后，我将购买“专业Android应用程序开发人员”一书。任何帮助将不胜感激。

Answer 1

此代码：

     registerReceiver(mReceiver, filter);
     myBluetooth.startDiscover();

必须出现在构造函数或方法中。快速浏览一下，我所看到的只是错误的，但没有任何承诺也没有。

编辑：

一种方法可能是实际上唯一有意义的方法，我的不好。

编辑：

评论中提到的包装东西......好抓@Ted

Answer 2

您的java语法无效。

你不能这样做：

private final BroadcastReceiver mReceiver = new BroadcastReceiver() 
{
 // Code here
}

也不是直接在课堂上

// Register the BroadcastReceiver
     IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
     registerReceiver(mReceiver, filter);
     myBluetooth.startDiscover();

Answer 3

你已经在错误的地方注册了broadcastereceiver，所以来了

  // Register the BroadcastReceiver
     IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
     registerReceiver(mReceiver, filter);
     myBluetooth.startDiscover();

在oncreate（）

中

语法错误，插入“}”以完成ClassBody

3 个答案: