android6.0搜索蓝牙无法显示问题解决

　　1.android6.0版本搜索蓝牙需要开启位置信息

　　需在Manifest中添加权限：

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

　　2.添加请求开启位置信息代码

private void mayRequestLocation() {
        if (Build.VERSION.SDK_INT >= 23) {
            int checkCallPhonePermission = ContextCompat.checkSelfPermission(getApplicationContext(),
                    Manifest.permission.ACCESS_COARSE_LOCATION);
            if(checkCallPhonePermission != PackageManager.PERMISSION_GRANTED){
                //判断是否需要 向用户解释，为什么要申请该权限
                if(ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION))
                    Toast.makeText(getApplicationContext(),"6.0就是这样坑", Toast.LENGTH_LONG).show();

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

            }
        } else {

        }
    }

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                       @NonNull int[] grantResults) {
    switch (requestCode) {
        case REQUEST_FINE_LOCATION:
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

            } else{
                // The user disallowed the requested permission.
            }
            break;

    }

}

　　3.亲测在6.0版本下可以搜索到蓝牙。

　　4.注：扫描时需关闭WIFI！