Android开发——蓝牙状态的监听

  今天遇到个问题，需要对蓝牙状态进行监听。这个功能之前做过，一直没有总结记录过，今天又遇到了，就记录一下蓝牙状态的监听过程。
  首先写一个广播接收器，主要实现蓝牙状态变化的广播接收。

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class BluetoothStateBroadcastReceive extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        switch (action){
            case BluetoothDevice.ACTION_ACL_CONNECTED:
                Toast.makeText(context , "蓝牙设备:" + device.getName() + "已链接", Toast.LENGTH_SHORT).show();
                break;
            case BluetoothDevice.ACTION_ACL_DISCONNECTED:
                Toast.makeText(context , "蓝牙设备:" + device.getName() + "已断开", Toast.LENGTH_SHORT).show();
                break;
            case BluetoothAdapter.ACTION_STATE_CHANGED:
                int blueState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0);
                switch (blueState){
                    case BluetoothAdapter.STATE_OFF:
                        Toast.makeText(context , "蓝牙已关闭", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.STATE_ON:
                        Toast.makeText(context , "蓝牙已开启"  , Toast.LENGTH_SHORT).show();
                        break;
                }
                break;
        }
    }
}

  然后注册上面这个广播接收器，这里就要根据具体需要可选择静态注册或动态注册了。

静态注册方法

<receiver android:name=".BluetoothStateBroadcastReceive">
      <intent-filter>
            <action android:name="android.bluetooth.device.action.ACL_CONNECTED"/>
            <action android:name="android.bluetooth.device.action.ACL_DISCONNECTED"/>
            <action android:name="android.bluetooth.adapter.action.STATE_CHANGED"/>
            <action android:name="android.bluetooth.adapter.action.STATE_CHANGED"/>
            <action android:name="android.bluetooth.adapter.action.STATE_CHANGED"/>
      </intent-filter>
</receiver>

动态注册方法

  首先定义一个接收器对象

private BluetoothStateBroadcastReceive mReceive;

  然后写注册方法

private void registerBluetoothReceiver(){
      if(mReceive == null){
            mReceive = new BluetoothStateBroadcastReceive();
      }
      IntentFilter intentFilter = new IntentFilter();
      intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
      intentFilter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
      intentFilter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
      intentFilter.addAction("android.bluetooth.BluetoothAdapter.STATE_OFF");
      intentFilter.addAction("android.bluetooth.BluetoothAdapter.STATE_ON");
      registerReceiver(mReceive, intentFilter);
 }

  再不需要的时候记得要注销，注销方法

private void unregisterBluetoothReceiver(){
     if(mReceive != null){
          unregisterReceiver(mReceive);
          mReceive = null;
     }
}