Question

我的OnItemClickListener有问题。例如，我在列表中有4个蓝牙设备，我点击一个元素，应用程序尝试仅与列表的最后一个元素配对，而不是与我点击的元素配对

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.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.lang.reflect.Method;
import java.util.ArrayList;


public class bluetooth extends AppCompatActivity {
    private ListView listView;
    private ArrayList<String> mDeviceList = new ArrayList<String>();
    private BluetoothAdapter mBluetoothAdapter;
    private final static int REQUEST_ENABLE_BT=1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bluetooth);

        listView = (ListView) findViewById(R.id.listView);
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        mBluetoothAdapter.startDiscovery();
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(mReceiver, filter);
        if(!mBluetoothAdapter.isEnabled())
        {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
            mBluetoothAdapter.startDiscovery();
            registerReceiver(mReceiver, filter);
        }

    }

    @Override
    protected void onDestroy() {
        unregisterReceiver(mReceiver);
        super.onDestroy();
    }
    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, final Intent intent) {
            final BluetoothDevice device = intent
                .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                mDeviceList.add(bluetoothDevice.getName() + "\n"
                    + bluetoothDevice.getAddress());
                listView.setAdapter(new ArrayAdapter<String>(context,
                    android.R.layout.simple_list_item_1, mDeviceList));
            }
            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> adapter, View view, int pos, long id){
                    String devicep=listView.getAdapter().getItem(pos).toString();
                    Log.i("device",devicep);
                    pairDevice(device);
                }
            });
        }
    };

    private void pairDevice(BluetoothDevice b1) {
        try {
            Method method = b1.getClass().getMethod("createBond", (Class[]) null);
            method.invoke(b1, (Object[]) null);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Answer 1

这可能是因为您已将最后发现的设备保存在变量“device”中，而在ListView onItemClick上，您正在调用pairDevice（设备），而不管项目被点击的位置如何。

您可能希望将所有已广播的已发现设备保存在列表中，并根据单击的项目从列表中获取相应的设备对象，如下所示：

private ArrayList<BluetoothDevice> mDevices = new ArrayList<BluetoothDevice>();

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, final Intent intent) {
        final BluetoothDevice device = intent
            .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        String action = intent.getAction();
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            // Add the recently discovered device in a list
            mDevices.add(bluetoothDevice);
            mDeviceList.add(bluetoothDevice.getName() + "\n"
                + bluetoothDevice.getAddress());
            listView.setAdapter(new ArrayAdapter<String>(context,
                android.R.layout.simple_list_item_1, mDeviceList));
        }
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapter, View view, int pos, long id){
                String devicep=listView.getAdapter().getItem(pos).toString();
                Log.i("device",device);
                // Get the BluetoothDevice corresponding to the clicked item
                pairDevice(mDevices.get(position));
            }
        });
    }
};

Answer 2

在你的onItemClick中，你没有对你点击的listitem做任何事情。您需要从列表中获取该项目并将其配对。

BluetoothDevice bluetoothDevice = (BluetoothDevice) listView.getAdapter().getItem(pos);
                pairDevice(bluetoothDevice);

试试并告诉我它是否有效。

Listview和OnItemClickListener（蓝牙设备）

2 个答案: