Android 6蓝牙 [英] Android 6 bluetooth

问题描述

我已升级到Android 6，并且使用蓝牙的应用程序无法与此新API版本一起使用. Play商店上的应用程序也存在同样的问题:蓝牙spp工具专业版(用于查看蓝牙是否正常的好应用程序)无法发现设备.

I upgraded to Android 6 and my applications who use Bluetooth doesn't work with this new API version. It's the same problem with application on Play Store: Bluetooth spp tools pro (good application to view if bluetooth works) which doesn't discovery of devices.

问题似乎出在蓝牙发现中:

The problem seems to be in Bluetooth discovery:

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mBluetoothAdapter.startDiscovery()
Log.i("BLUETOOTH", String.valueOf(mBluetoothAdapter.isDiscovering())); // Return false

我的应用程序在Android 4/5上运行良好，我遵循: http://developer.android. com/guide/topics/connectivity/bluetooth.html

My applications work well with Android 4/5 and I followed : http://developer.android.com/guide/topics/connectivity/bluetooth.html

推荐答案

盯着Android 6.0，仅在清单上添加权限是不够的. 您必须明确询问用户有关被视为危险"的每个权限. BluetoothDevice.ACTION_FOUND需要BLUETOOTH和ACCESS_COARSE_LOCATION权限 http://developer.android.com/reference/android/bluetooth/BluetoothDevice .html#ACTION_FOUND

Staring with Android 6.0 it is not enough to include permissions on manifest. You have to ask the user explicitly about each permission that is considered "dangerous". BluetoothDevice.ACTION_FOUND requires BLUETOOTH and ACCESS_COARSE_LOCATION permissions http://developer.android.com/reference/android/bluetooth/BluetoothDevice.html#ACTION_FOUND

ACCESS_COARSE_LOCATION http://developer.android.com/reference/android/Manifest.permission .html#ACCESS_COARSE_LOCATION 是危险"许可，因此您必须在进行实际发现之前使用requestPermission进行请求.

The ACCESS_COARSE_LOCATION http://developer.android.com/reference/android/Manifest.permission.html#ACCESS_COARSE_LOCATION is a "dangerous" permission and therefore you have to ask for it using requestPermission before doing actual discovery.

  public void doDiscovery() {
    int hasPermission = ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION);
    if (hasPermission == PackageManager.PERMISSION_GRANTED) {
        continueDoDiscovery();
        return;
    }

    ActivityCompat.requestPermissions(MainActivity.this,
            new String[]{
                    android.Manifest.permission.ACCESS_COARSE_LOCATION},
            REQUEST_COARSE_LOCATION_PERMISSIONS);
}

然后您将在onRequestPermissionsResult上获得用户答案

then on you will get the user answer on onRequestPermissionsResult

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
       case REQUEST_COARSE_LOCATION_PERMISSIONS: {
            if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                continueDoDiscovery();
            } else {
                Toast.makeText(this,
                        getResources().getString(R.string.permission_failure),
                        Toast.LENGTH_LONG).show();
                cancelOperation();
            }
            return;
        }
    }
}

要使用早期版本的android，您应该使用兼容性库，并使用ActivityCompat进行调用

To work with previous versions of android you should use compatibility libraries and make the calls using ActivityCompat

这篇关于Android 6蓝牙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！