今天在做项目的时候，需要监听一个蓝牙耳机的连接状态。就写了一个小的测试方法。记录如下

看代码

这要处理的是蓝牙监听事件

package com.example.alert;import android.bluetooth.BluetoothAdapter;import android.bluetooth.BluetoothHeadset;import android.bluetooth.BluetoothProfile;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;import android.widget.Toast;public class HeadsetPlugReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        // TODO Auto-generated method stub        String action = intent.getAction();        if (action.equals(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED)) {            Log.e("123", "BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED");        } else if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {            Log.e("123", "BluetoothAdapter.ACTION_STATE_CHANGED");            int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1);            switch (state) {            case BluetoothAdapter.STATE_OFF:                Log.e("123", "BluetoothAdapter.STATE_OFF");                break;            case BluetoothAdapter.STATE_TURNING_ON:                Log.e("123", "BluetoothAdapter.STATE_TURNING_ON");                break;            case BluetoothAdapter.STATE_ON:                Log.e("123", "BluetoothAdapter.STATE_ON");                break;            case BluetoothAdapter.STATE_TURNING_OFF:                Log.e("123", "BluetoothAdapter.STATE_TURNING_OFF");                break;            }        } else if (action                .equals(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED)) {            Log.e("123", "BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED");            int state = intent.getIntExtra(BluetoothProfile.EXTRA_STATE, -1);            switch (state) {            case BluetoothProfile.STATE_DISCONNECTED:                Log.e("123", "BluetoothProfile.STATE_DISCONNECTED");                break;            case BluetoothProfile.STATE_CONNECTING:                Log.e("123", "BluetoothProfile.STATE_CONNECTING");                break;            case BluetoothProfile.STATE_CONNECTED:                Log.e("123", "BluetoothProfile.STATE_CONNECTED");                break;            case BluetoothProfile.STATE_DISCONNECTING:                Log.e("123", "BluetoothProfile.STATE_DISCONNECTING");                break;            }        }    }}

蓝牙的监听，需要加入权限，如下

 

下面是我们打印的结果

1.没有蓝牙耳机连接的情况下

蓝牙从断开到连接

1 09-21 11:45:27.223: E/123(15118): BluetoothAdapter.ACTION_STATE_CHANGED  2 09-21 11:45:27.223: E/123(15118): BluetoothAdapter.STATE_TURNING_ON  3 09-21 11:45:27.707: E/123(15118): BluetoothAdapter.ACTION_STATE_CHANGED  4 09-21 11:45:27.708: E/123(15118): BluetoothAdapter.STATE_ON

从连接到断开

1 09-21 11:49:09.126: E/123(15118): BluetoothAdapter.ACTION_STATE_CHANGED  2 09-21 11:49:09.126: E/123(15118): BluetoothAdapter.STATE_TURNING_OFF  3 09-21 11:49:09.271: E/123(15118): BluetoothAdapter.ACTION_STATE_CHANGED  4 09-21 11:49:09.271: E/123(15118): BluetoothAdapter.STATE_OFF

2.有蓝牙耳机连接的情况

 关闭蓝牙耳机（蓝牙保持打开）

1 09-21 22:12:15.439: E/123(17042): BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED  2 09-21 22:12:15.449: E/123(17042): BluetoothProfile.STATE_DISCONNECTED  3 09-21 22:12:16.457: E/123(17042): BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED

连接蓝牙耳机

1 09-21 22:14:22.356: E/123(17042): BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED  2 09-21 22:14:22.356: E/123(17042): BluetoothProfile.STATE_CONNECTED  3 09-21 22:14:22.357: E/123(17042): BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED

关闭蓝牙

1 09-21 22:15:12.558: E/123(17042): BluetoothAdapter.ACTION_STATE_CHANGED  2 09-21 22:15:12.559: E/123(17042): BluetoothAdapter.STATE_TURNING_OFF  3 09-21 22:15:13.557: E/123(17042): BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED  4 09-21 22:15:13.557: E/123(17042): BluetoothProfile.STATE_DISCONNECTED  5 09-21 22:15:13.908: E/123(17042): BluetoothAdapter.ACTION_STATE_CHANGED  6 09-21 22:15:13.908: E/123(17042): BluetoothAdapter.STATE_OFF

打开蓝牙

1 09-21 22:16:06.976: E/123(17042): BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED  2 09-21 22:16:06.976: E/123(17042): BluetoothProfile.STATE_CONNECTING  3 09-21 22:16:06.978: E/123(17042): BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED  4 09-21 22:16:07.036: E/123(17042): BluetoothAdapter.ACTION_STATE_CHANGED  5 09-21 22:16:07.036: E/123(17042): BluetoothAdapter.STATE_ON  6 09-21 22:16:10.616: E/123(17042): BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED  7 09-21 22:16:10.616: E/123(17042): BluetoothProfile.STATE_CONNECTED  8 09-21 22:16:10.619: E/123(17042): BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED

 从上面的结果我们能够明白蓝牙监听相关事件

的职责

1.BluetoothAdapter.ACTION_STATE_CHANGED：这个主要是用来监听蓝牙打开与否的状态，它穿过来的参数包含蓝牙正在断开、断开、正在连接、连接的状态，每次状态更改，都会触发这个广播

2.BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED：这个主要是监听蓝牙设备连接状态。它同样包含四种状态

3.BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED：这个就是监听蓝牙耳机的连接状态了。

至于他们监听的顺序，目前还不大清楚，似乎没有一个严格的先后顺序。就是感觉是

如果设备处于连接状态，优先级比较高

如果设备处于断开状态，它的存在条件优先级比较高