如何等到蓝牙在android中打开

我需要以编程方式在Android设备中打开蓝牙并等到它继续进行下一行代码.

我的代码如下

if (!mBluetoothAdapter.isEnabled()) {
                Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                ctx.startActivity(enableBtIntent);
}

当这样做时,代码继续从nect行执行,而不必完全等待蓝牙.有什么方法可以解决这个问题吗？我可以添加外观来检查蓝牙是否已打开？

解决方法:

您可以注册BroadcastReceiver以侦听BluetoothAdapter上的状态更改.

首先创建一个将侦听状态更改的BroadcastReceiver

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();

        if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
            final int bluetoothState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
                                                BluetoothAdapter.ERROR);
            switch (bluetoothState) {
            case BluetoothAdapter.STATE_ON:
                //Bluethooth is on, now you can perform your tasks
                break;
            }
        }
    }
};

然后在创建时使用您的Activity注册BroadcastReceiver,以便它可以开始接收事件.

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //Set a filter to only receive bluetooth state changed events.
    IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
    registerReceiver(mReceiver, filter);
}

记住在销毁Activity时取消注册侦听器.

@Override
public void onDestroy() {
    super.onDestroy();
    unregisterReceiver(mReceiver);
}

标签：android,android-bluetooth
来源： https://codeday.me/bug/20190716/1475360.html