Question

我需要检查异步任务中的doInBackground方法中是否已连接任何设备并通过蓝牙与我的设备通信。如果已连接/正在通信-将吐司消息显示为“已连接”。如果未显示为“未连接设备”。

我到处搜索，但没有答案满足我的要求。

Answer 1

我不详细了解您的问题，但是我的解决方案将是用于蓝牙适配器的BroadhastReceiver。

public Integer getPlayerBits(Player p) {
    String queryStr = "SELECT Coins FROM PlayerData WHERE PlayerUID=?";
    try {
        Connection conn = getConn();
        PreparedStatement st = conn.prepareStatement(queryStr);
        st.setString(1, p.getUniqueId().toString());
        ResultSet rs = st.executeQuery();
        rs.next();
        Integer amount = (Integer) rs.getInt("Coins");
        conn.close();
        return amount;
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return null;
}

public void addBits(Player p, int bitAmount) {
    String queryStr = "UPDATE PlayerData SET Coins = Coins + ? WHERE PlayerUID=?";
    try {
        Connection conn = getConn();
        PreparedStatement ps = conn.prepareStatement(queryStr);
        ps.setInt(1, bitAmount);
        ps.setString(2, p.getUniqueId().toString());
        ps.executeUpdate();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }

}

public void removeBits(Player p, int bitAmount) {
    String queryStr = "UPDATE PlayerData SET Coins = Coins - ? WHERE PlayerUID=?";
    try {
        Connection conn = getConn();
        PreparedStatement ps = conn.prepareStatement(queryStr);
        ps.setInt(1, bitAmount);
        ps.setString(2, p.getUniqueId().toString());
        ps.executeUpdate();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
       }

    }
 }

如果您告诉我您想确切执行的操作，例如：根据状态运行一些代码，执行一些TextView更改，或诸如回调方法之类的东西，

或其他什么，我可以尝试为您提供更多帮助。

我现在要做的是创建一些静态函数，您应该能够在AsynkTask中调用它们，只需调用public class AnyActivity extends AppCompatActivity { private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); private static boolean isConnected = false; private static boolean isConnecting = false; private static boolean isDisdconected = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_any); IntentFilter BT_ConState_filter = new IntentFilter(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED); this.registerReceiver(BR_BT_ConState, BT_ConState_filter); } BroadcastReceiver BR_BT_ConState =new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action_BR_BT_ConState =intent.getAction(); int iBR_BT_ConState_state = intent.getIntExtra(BluetoothAdapter.EXTRA_CONNECTION_STATE, mBluetoothAdapter.ERROR); if (action_BR_BT_ConState.equals(mBluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED)) { switch (iBR_BT_ConState_state) { case BluetoothAdapter.STATE_CONNECTING: Toast.makeText(this, "Connecting" ,Toast.LENGTH_SHORT).show(); isConnected = false; isConnecting = true; isDisdconected = false; break; case BluetoothAdapter.STATE_CONNECTED: Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show(); isConnected = true; isConnecting = false; isDisdconected = false; break; case BluetoothAdapter.STATE_DISCONNECTED: Toast.makeText(this, "Disconected", Toast.LENGTH_SHORT).show(); isConnected = false; isConnecting = false; isDisdconected = true; break; } } } }; public static boolean isConnected(){ return isConnected; } public static boolean isDisConnected(){ return isDisConnected; } public static boolean isConnecting(){ return isDisConnected; } @Override protected void onDestroy(){ super.onDestroy(); context.unregisterReceiver(BR_BT_ConState); } }，您就会返回BluetoothAdapter的当前状态。

Answer 2

你在说话吗？是的，然后创建一个回调

    private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        switch (newState) {
            case BluetoothProfile.STATE_DISCONNECTED:

                break;

            case BluetoothProfile.STATE_CONNECTING:

                break;

            case BluetoothProfile.STATE_CONNECTED:

                break;
        }
    }

如何使用异步任务以编程方式检查蓝牙是否已与其他设备连接？

2 个答案: