哪个android权限更适合发现蓝牙设备或接收蓝牙广播？

Question

我在尝试发现蓝牙设备时遇到权限问题。

问题：-"requires android.permission.ACCESS_COARSE_LOCATION due to sender com.android.bluetooth" 已将以下权限添加到清单

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

Answer 1

在 Marshmallow 上发现 BT 设备的正确步骤如下：

1) 在清单中有 ACCESS_COARSE_LOCATION 权限要求以及通常的蓝牙权限：

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

2)确保您拥有 运行 时间的 ACCESS_COARSE_LOCATION

权限

protected void checkLocationPermission() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {

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

@Override
public void onRequestPermissionsResult(int requestCode,
                                   String permissions[], int[] grantResults) {
    switch (requestCode) {
    case REQUEST_COARSE_LOCATION: {
        if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            proceedDiscovery(); // --->
        } else {
            //TODO re-request
        }
        break;
    }
}
}

3) 为 ACTION_FOUND 注册广播接收器并调用

BluetoothAdapter.startDiscovery()
protected void proceedDiscovery() {
    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    filter.addAction(BluetoothDevice.ACTION_NAME_CHANGED);
    registerReceiver(mReceiver, filter);

    mBluetoothAdapter.startDiscovery();
}