等待用户许可继续

Question

我想让我的应用程序在应用程序继续之前等待用户授予权限。我搜索了有关它的其他线程，发现常见的方法是使用onRequestPermissionResult. 现在我对如何设置它一无所知：我是将我的程序代码放入onRequestPermissionResult除了请求本身还是我需要如何设置它，以便用户被要求然后应用程序继续？这是我的代码：if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {   if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)           != PackageManager.PERMISSION_GRANTED) {       ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 123);   } else {       progressBar.setVisibility(View.VISIBLE);       GPSTracker gt = new GPSTracker(getActivity().getApplicationContext());       Location location = gt.getLocation();       if (location == null) {           Toast.makeText(getActivity(), "No location found.",                   Toast.LENGTH_LONG).show();       } else {           lat = location.getLatitude();           lon = location.getLongitude();       }       new GetContacts().execute();   }} else {  progressBar.setVisibility(View.VISIBLE);  GPSTracker gt = new GPSTracker(getActivity().getApplicationContext());  Location location = gt.getLocation();  if (location == null) {     Toast.makeText(getActivity(), "No location found.",              Toast.LENGTH_LONG).show();  } else {      lat = location.getLatitude();      lon = location.getLongitude();  }    new GetContacts().execute();}和请求结果：@Overridepublic void onRequestPermissionsResult(int requestCode,                                       String permissions[], int[] grantResults) {    switch (requestCode) {        case 123: {            // If request is cancelled, the result arrays are empty            if (grantResults.length > 0                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                progressBar.setVisibility(View.VISIBLE);                GPSTracker gt = new GPSTracker(getActivity().getApplicationContext());                Location location = gt.getLocation();

Answer 1

就像评论中提到的 Martin Zeitler 一样，您必须为 Marshmallow 上方和下方的 API 做好准备，例如：

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

    if(ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)

     != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(getActivity(), new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, 123);

    } else {

        //GPS method

    }

} else {

    //GPS method

}

就像你在 onRequestResult 的问题中提到的一样：

@Override

public void onRequestPermissionsResult(int requestCode,

                                       String permissions[], int[] grantResults) {

    switch (requestCode) {

        case 123: {

            // If request is cancelled, the result arrays are empty

            if (grantResults.length > 0

                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                //GPS method

            } else {

                // Toast for user

            }

            return;

        }

    }

}