android 监听蓝牙连接状态
时间: 2024-09-13 20:05:33 浏览: 22
在Android中监听蓝牙连接状态,通常需要使用`BluetoothAdapter`类。首先,你需要获取`BluetoothAdapter`的实例,然后可以注册一个广播接收器来监听蓝牙相关的状态变化。以下是具体的步骤和代码示例:
1. 获取`BluetoothAdapter`实例:
```java
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
```
2. 检查蓝牙是否开启,如果未开启,则提示用户开启蓝牙:
```java
if (bluetoothAdapter == null) {
// 设备不支持蓝牙
} else if (!bluetoothAdapter.isEnabled()) {
// 蓝牙未开启,提示用户开启
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
```
3. 注册一个`BroadcastReceiver`来监听蓝牙状态变化:
```java
private final BroadcastReceiver receiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
switch (state) {
case BluetoothAdapter.STATE_OFF:
// 蓝牙已关闭
break;
case BluetoothAdapter.STATE_TURNING_OFF:
// 正在关闭蓝牙
break;
case BluetoothAdapter.STATE_ON:
// 蓝牙已开启
break;
case BluetoothAdapter.STATE_TURNING_ON:
// 正在开启蓝牙
break;
}
}
}
};
// 注册receiver
IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(receiver, filter);
```
4. 不要忘记在不需要的时候注销receiver,避免内存泄漏:
```java
unregisterReceiver(receiver);
```