[英]Android 6.0 Bluetooth Program Cannot Discover Any Available Bluetooth Devices
目標
發現所有可用的藍牙設備,例如我的iPad藍牙ON(可發現)。
ANDROID VERSION
6
問題
無法發現任何藍牙設備。
碼
// Permission
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
public BroadcastReceiver mReceiver;
public IntentFilter filter;
private boolean discover_AvailableBluetoothDevice() {
mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
Log.d(TAG, "onReceive Called");
String action = intent.getAction();
// When discovery finds a device
if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
Log.d(TAG, "ACTION_DISCOVERY_STARTED");
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
Log.d(TAG, "ACTION_DISCOVERY_FINISHED");
} else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
Log.d(TAG, "ACTION_FOUND");
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = (BluetoothDevice) intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
String str = device.getName() + "\n( " + device.getAddress() + " )";
adapter.add(str);
}
}
};
filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
boolean isSuccessDiscovery = mBluetoothAdapter.startDiscovery();
return isSuccessDiscovery;
}
執行結果(logcat)
02-02 01:17:26.142 7194-7194/eie.imt.smartswitch D/†MainActivity: This device support Bluetooth.
02-02 01:17:55.052 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: isSuccessDiscovery=true
02-02 01:17:55.147 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: onReceive Called
02-02 01:17:55.147 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: ACTION_DISCOVERY_STARTED
02-02 01:18:07.909 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: onReceive Called
02-02 01:18:07.910 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: ACTION_DISCOVERY_FINISHED
我看到程序沒有進入ACTION_FOUND的條件塊但我的iPad的藍牙是ON,問題來自哪里?
如果您使用的是Android 6,請添加以下權限之一:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCTION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
並打開位置服務(GPS):
並啟用位置權限:
Google現在需要ACCESS_FINE_LOCTION
或ACCESS_COARCE_LOCATION
權限才能掃描藍牙或Wifi設備。 這是一種奇怪的行為,但谷歌表示從現在開始應該如何運作。
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