问题
My application needs to connect to a a2dp device over bluetooth and I want to "be able to query for the visible bluetooth devices, then, select a a2dp device and have it 'connect via a2dp' so that audio starts playing through the connected device" but my phone is running gingerbread (2.3.3).
I went through the basic bluetooth tutorial at http://developer.android.com/guide/topics/wireless/bluetooth.html and got to the part I need to connect to the bluetooth device and then I read the bottom of the page:
"Starting in Android 3.0, the Bluetooth API includes support for working with Bluetooth profiles." -> does this mean that I am S.O.L.? Is there any way to programmatically (why does stackoverflow mark programmatically as being misspelled?!) connect to a a2dp device using a pre-3.0 version of Android? Is my only option to direct the user to go into their settings/pull up the settings programmatically?? Because I'm able to do it through the settings, I guess I just assumed it would be possible via my application as well.
Help?
回答1:
Some of the Bluetooth classes (profiles like BluetoothA2dp) are hidden in Gingerbread. It means that their declaration is annotated by @hide, and they are not included into the SDK (Android.jar). This is done intentionally, since these APIs are likely to be changed in newer Android versions. Generally it is not a good idea to use hidden APIs, since your App can stop working on newer Android versions, but if you are sure you want to, follow http://devmaze.wordpress.com/2011/01/18/using-com-android-internal-part-1-introduction/
Once you get access to them do something like (just a hint):
BluetoothA2dp mBluetoothA2dp = new BluetoothA2dp(context);
BluetoothDevice device = BluetoothAdapter.getDefaultAdapter().
// Loop through paired devices
for (BluetoothDevice device : mBluetoothAdapter.getBondedDevices()) {
if (device.getName().contains("whatyouwant")) {
mBluetoothA2dp.addSink(device);
}
}
回答2:
So, after much more research, it seems that it is impossible to programmatically connect to a A2DP device on a pre-3.0 Android device. I am going mark this as the answer but, if someone finds otherwise, please correct me on this as I would really like to do it programmatically.
来源：https://stackoverflow.com/questions/7665703/how-write-a-program-to-connect-to-a-a2dp-bluetooth-device-using-pre-3-0-android