Android的广播接收器的蓝牙事件捕获 [英] Android Broadcast Receiver bluetooth events catching
问题描述
我试图赶上与广播接收器的蓝牙状态的变化。
I'm trying to catch bluetooth state changes with Broadcast Receiver.
我的清单：
<uses-permission android:name="android.permission.BLUETOOTH" />
<application>
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".BluetoothBroadcastReceiver"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.bluetooth.adapter.action.STATE_CHANGED" />
<action android:name="android.bluetooth.adapter.action.CONNECTION_STATE_CHANGED" />
<action android:name="android.bluetooth.device.action.ACL_CONNECTED" />
<action android:name="android.bluetooth.device.action.ACL_DISCONNECTED" />
</intent-filter>
</receiver>
</application>
接收的onReceive 方法：
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Log.d("BroadcastActions", "Action "+action+"received");
int state;
BluetoothDevice bluetoothDevice;
switch(action)
{
case BluetoothAdapter.ACTION_STATE_CHANGED:
state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1);
if (state == BluetoothAdapter.STATE_OFF)
{
Toast.makeText(context, "Bluetooth is off", Toast.LENGTH_SHORT).show();
Log.d("BroadcastActions", "Bluetooth is off");
}
else if (state == BluetoothAdapter.STATE_TURNING_OFF)
{
Toast.makeText(context, "Bluetooth is turning off", Toast.LENGTH_SHORT).show();
Log.d("BroadcastActions", "Bluetooth is turning off");
}
else if(state == BluetoothAdapter.STATE_ON)
{
Log.d("BroadcastActions", "Bluetooth is on");
}
break;
case BluetoothDevice.ACTION_ACL_CONNECTED:
bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Toast.makeText(context, "Connected to "+bluetoothDevice.getName(),
Toast.LENGTH_SHORT).show();
Log.d("BroadcastActions", "Connected to "+bluetoothDevice.getName());
break;
case BluetoothDevice.ACTION_ACL_DISCONNECTED:
bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Toast.makeText(context, "Disconnected from "+bluetoothDevice.getName(),
Toast.LENGTH_SHORT).show();
break;
}
}
我启动应用程序，然后通过pressing Home键最小化。去设置和开启蓝牙，但没有任何反应。虽然我希望面包和logcat的消息。什么是错在这里？
I launch app then minimize it by pressing Home button. Go to settings and turn on bluetooth but nothing happens. Though I expect toast and logcat messages. What's wrong here?
推荐答案
为了赶蓝牙状态变化（STATE_OFF，STATE_TURNING_ON，STATE_ON，STATE_TURNING_OFF），这样在你的活动：
In order to catch Bluetooth state changes (STATE_OFF, STATE_TURNING_ON, STATE_ON, STATE_TURNING_OFF), do this in your Activity:
Firt，权限添加到您的AndroidManifest文件：
Firt, add permission to your AndroidManifest file:
<uses-permission android:name="android.permission.BLUETOOTH" />
在你的活动或服务创建一个BroadcastReceiver：
Create a BroadcastReceiver in your Activity or Service:
private final BroadcastReceiver mBroadcastReceiver1 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
switch(state) {
case BluetoothAdapter.STATE_OFF:
..
break;
case BluetoothAdapter.STATE_TURNING_OFF:
..
break;
case BluetoothAdapter.STATE_ON:
..
break;
case BluetoothAdapter.STATE_TURNING_ON:
..
break;
}
}
}
};
创建一个IntentFilter的，并与BroadcastReceiver的在你的的onCreate（）方法将其注册到活动/服务：
Create an IntentFilter and register it with BroadcastReceiver to Activity/Service in your onCreate() method:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
IntentFilter filter1 = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBroadcastReceiver1, filter1);
...
}
取消注册的BroadcastReceiver在的onDestroy（）方法：
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mBroadcastReceiver1);
}
为了捕捉设备（SCAN_MODE_NONE，SCAN_MODE_CONNECTABLE，SCAN_MODE_CONNECTABLE_DISCOVERABLE）的可发现性的变化，创建另一个的BroadcastReceiver和注册/注销你的活动，因为我上面提到的。与那些BroadcastReceiver的唯一区别是第一个使用 BluetoothAdapter.EXTRA_STATE ，另一个使用 BluetoothAdapter.EXTRA_SCAN_MODE 。下面是例子$ C $下的BroadcastReceiver捕捉发现性的变化：
In order to catch changes of discoverability of device (SCAN_MODE_NONE, SCAN_MODE_CONNECTABLE, SCAN_MODE_CONNECTABLE_DISCOVERABLE), create another BroadcastReceiver and register/unregister to your Activity as I mentioned above. Only difference between those BroadcastReceiver's is first one uses BluetoothAdapter.EXTRA_STATE and the other one uses BluetoothAdapter.EXTRA_SCAN_MODE. Here is the example code for BroadcastReceiver to catch discoverability changes:
创建过滤器和的onCreate注册它（）方法：
IntentFilter filter2 = new IntentFilter();
filter2.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
filter2.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
filter2.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
registerReceiver(mBroadcastReceiver2, filter2);
在创建活动/服务的BroadcastReciver赶上发现性的变化：
Create the BroadcastReciver in Activity/Service to catch discoverability changes:
private final BroadcastReceiver mBroadcastReceiver2 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if(action.equals(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED)) {
int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE, BluetoothAdapter.ERROR);
switch(mode){
case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE:
..
break;
case BluetoothAdapter.SCAN_MODE_CONNECTABLE:
..
break;
case BluetoothAdapter.SCAN_MODE_NONE:
..
break;
}
}
}
};
和最后注销其在的onDestroy（）：
unregisterReceiver(mBroadcastReceiver2);
需要注意的是，你不需要添加任何＆LT;意向滤光器＆gt; 或＆LT;接收器＆GT; 你AndroidManifest文件，除非你需要添加，当然蓝牙许可。
Note that, you don't need to add any <intent-filter> or <receiver> to your AndroidManifest file, except you need to add Bluetooth permission of course.
如果你想捕获（ACTION_ACL_CONNECTED，ACTION_ACL_DISCONNECTED，ACTION_ACL_DISCONNECT_REQUESTED），现在你需要添加一个＆LT;意向滤光器＆gt; 您AndroidManifest文件：
If you want to catch (ACTION_ACL_CONNECTED, ACTION_ACL_DISCONNECTED, ACTION_ACL_DISCONNECT_REQUESTED), now you need to add an <intent-filter> to your AndroidManifest file:
<intent-filter>
<action android:name="android.bluetooth.device.action.ACL_CONNECTED" />
<action android:name="android.bluetooth.device.action.ACL_DISCONNECTED" />
</intent-filter>
创建过滤器和的onCreate注册它（）方法：
IntentFilter filter3 = new IntentFilter();
filter3.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
filter3.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
registerReceiver(mBroadcastReceiver3, filter3);
然后在你的活动/服务创建BroadcastReceiver的：
Then create the BroadcastReceiver in your Activity/Service:
private final BroadcastReceiver mBroadcastReceiver3 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
switch (action){
case BluetoothDevice.ACTION_ACL_CONNECTED:
..
break;
case BluetoothDevice.ACTION_ACL_DISCONNECTED:
..
break;
}
}
};
最后，注销：
And lastly, unregister:
unregisterReceiver(mBroadcastReceiver3);
如果您想了解更多关于状态常量，这是从文档：
If you want to read more about state constants, this is from the documentation:
<一个href="http://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#EXTRA_STATE">public静态最后弦乐EXTRA_STATE ：
在ACTION_STATE_CHANGED意图用作整型附加域，来请求 当前的电源状态。可能的值有：STATE_OFF， STATE_TURNING_ON，STATE_ON，STATE_TURNING_OFF
Used as an int extra field in ACTION_STATE_CHANGED intents to request the current power state. Possible values are: STATE_OFF, STATE_TURNING_ON, STATE_ON, STATE_TURNING_OFF
<一个href="http://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#EXTRA_SCAN_MODE">public静态最后弦乐EXTRA_SCAN_MODE ：
用于在ACTION_SCAN_MODE_CHANGED意图以一个整型附加域 请求当前扫描模式。可能的值有：SCAN_MODE_NONE， SCAN_MODE_CONNECTABLE，SCAN_MODE_CONNECTABLE_DISCOVERABLE
Used as an int extra field in ACTION_SCAN_MODE_CHANGED intents to request the current scan mode. Possible values are: SCAN_MODE_NONE, SCAN_MODE_CONNECTABLE, SCAN_MODE_CONNECTABLE_DISCOVERABLE
这篇关于Android的广播接收器的蓝牙事件捕获的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
