Question

我正在尝试创建一个应用程序，它将获取手机的当前位置并将其显示为地图上的标记。我正在使用具有不同类型的Android版本的设备。它在棒棒糖中运行良好并显示了我当前的位置，但它不适用于其他版本，它只显示地图。它没有向我提供错误消息，所以我不确定发生了什么。

这是我用来获取当前位置的代码：

{{1}}

谢谢！

Answer 1

尝试this回答。有时getLastKnownLocation（）返回null。所以你还要添加位置更新请求..

Answer 2

对于Marshmallow及以上，您必须明确要求用户许可。您可以使用此代码来实现它

private void RequestAllPermissions() {

        String[] PERMISSIONS = {Manifest.permission.CAMERA, Manifest.permission.RECEIVE_SMS, Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.INTERNET, Manifest.permission.CALL_PHONE, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.WRITE_CONTACTS};

        if (!hasPermissions(this, PERMISSIONS)) {
            ActivityCompat.requestPermissions(this, PERMISSIONS, REQUESTCODE_PERMISSION_ALL);
        } else

    }

public static boolean hasPermissions(Context context, String... permissions) {

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
            for (String permission : permissions) {
                if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                    return false;
                }
            }
        }
        return true;

    }


@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {

    switch (requestCode) {
        case REQUESTCODE_PERMISSION_ALL: {

            boolean allpermissiongranted = true;
            if (grantResults.length > 0) {
                for (int i = 0; i < permissions.length; i++) {
                    if (grantResults[i] != PackageManager.PERMISSION_GRANTED) {
                        allpermissiongranted = false;
                        break;
                    }
                }
            } else
                allpermissiongranted = false;

            if (allpermissiongranted) {
                //do task

            } else {

                new SweetAlertDialog(mContext, SweetAlertDialog.WARNING_TYPE)
                        .setTitleText("Permission Not Granted")
                        .setContentText("Kindly grant all requested permission to proceed.")
                        .setConfirmText("Request")
                        .setConfirmClickListener(new SweetAlertDialog.OnSweetClickListener() {
                            @Override
                            public void onClick(SweetAlertDialog sDialog) {
                                sDialog.dismissWithAnimation();
                                RequestAllPermissions();
                            }
                        })
                        .setCancelText("Exit")
                        .setCancelClickListener(new SweetAlertDialog.OnSweetClickListener() {
                            @Override
                            public void onClick(SweetAlertDialog sweetAlertDialog) {
                                sweetAlertDialog.dismissWithAnimation();
                                finish();
                            }
                        })
                        .show();
            }

        }

getLastKnownLocation无法在更高版本的Android（6及更高版本）中运行

2 个答案: