Android 如何正确处理访问位置的onPermissionResult?
我正在为谷歌定位服务写一个hello world程序。我已经把大部分东西都编码好了;以下是Android 如何正确处理访问位置的onPermissionResult?,android,android-permissions,Android,Android Permissions,我正在为谷歌定位服务写一个hello world程序。我已经把大部分东西都编码好了;以下是onConnected方法: public void onConnected(Bundle bundle) { // Construct the Location Request mLocationRequest = new LocationRequest(); mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_A
onConnected
方法:
public void onConnected(Bundle bundle) {
// Construct the Location Request
mLocationRequest = new LocationRequest();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(30000);
// Check if permission granted
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// If not, ask for it.
// On Marshmallow, display permission request dialog
ActivityCompat.requestPermissions(
this,
new String[] {Manifest.permission.ACCESS_FINE_LOCATION},
LOCATION_REQUEST_NUMBER);
} else {
// If already granted, request for location updates
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
但是当用户点击对话框上的Allow后,我有点困惑于该怎么做
据我所知,我应该这样做:
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults){
switch (requestCode) {
case LOCATION_REQUEST_NUMBER: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission Granted
// Great. Now what?
// I tried the following, but it crashes
// LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
// I also tried the following, but it still does nothing.
mGoogleApiClient.connect();
} else {
// Permission Denied.
}
}
}
}
我尝试在授予的权限上再次调用requestLocationUpdates
,但出现以下情况:
java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=1, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.example.starleaf1.locationexercise/com.example.starleaf1.locationexercise.MainActivity}: java.lang.NullPointerException: Attempt to read from field 'int com.google.android.gms.location.LocationRequest.b' on a null object reference
添加了详细信息:
我希望应用程序告诉TextView
显示当前坐标。我是这样编码的:
@Override
public void onLocationChanged(Location location) {
Log.i(LOG_TAG, "Location has changed.");
output.setText(location.toString());
}
但是,当点击“允许”按钮时,应用程序只是坐在那里无所事事。必须重新启动应用程序才能使其正常工作。请尝试以下代码
private void showPermissionDialog() {
// Here, thisActivity is the current activity
if (ContextCompat.checkSelfPermission(mActivity,
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(mActivity,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an expanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(mActivity,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_FOR_LOCATION);
// MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
// app-defined int constant. The callback method gets the
// result of the request.
}
} else {
if (mGoogleApiClient != null)
mGoogleApiClient.connect();
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_FOR_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient != null)
mGoogleApiClient.connect();
// permission was granted, yay! Do the
// contacts-related task you need to do.
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
然后使用这个变量
private static final int MY_PERMISSIONS_REQUEST_FOR_LOCATION = 1;
试试这个
声明:
private static final int REQUEST_CODE_SOME_FEATURES_PERMISSIONS = 124;
然后
if(android.os.Build.VERSION.SDK_INT>=23) {
int hasLocationPermission = checkSelfPermission(android.Manifest.permission.ACCESS_FINE_LOCATION);
List<String> permissions = new ArrayList<String>();
if (hasLocationPermission != PackageManager.PERMISSION_GRANTED) {
permissions.add(android.Manifest.permission.ACCESS_FINE_LOCATION);
}
if (!permissions.isEmpty()) {
requestPermissions(permissions.toArray(new String[permissions.size()]), REQUEST_CODE_SOME_FEATURES_PERMISSIONS);
}
}
if(android.os.Build.VERSION.SDK\u INT>=23){
int hasLocationPermission=checkSelfPermission(android.Manifest.permission.ACCESS\u FINE\u LOCATION);
列表权限=新建ArrayList();
if(hasLocationPermission!=已授予PackageManager.PERMISSION){
permissions.add(android.Manifest.permission.ACCESS\u FINE\u位置);
}
如果(!permissions.isEmpty()){
requestPermissions(permissions.toArray(新字符串[permissions.size()])、REQUEST\u CODE\u一些\u功能\u权限);
}
}
及
public void onRequestPermissionsResult(int-requestCode,String[]permissions,int[]grantResults){
开关(请求代码){
案例请求\u代码\u某些\u功能\u权限:{
for(int i=0;i
您需要两个权限
ActivityCompat.requestPermissions(this,new String[] {Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION},LOCATION_REQUEST_NUMBER);
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case LOCATION_REQUEST_NUMBER: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient != null)
mGoogleApiClient.connect();
// permission was granted, yay! Do the
// contacts-related task you need to do.
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
您应该在加载活动时检查这些权限,以便
授予权限后,可以初始化位置实例
当我们请求位置许可时,尝试使用此选项,
我们需要申请两个权限才能访问\u FINE\u位置和
进入课程地点。
私有静态最终int权限\请求\代码=1;
私有void checkPermission()
{
if(android.os.Build.VERSION.SDK_INT>=23){
int result=ContextCompat.checkSelfPermission(YourClass.this、Manifest.permission.ACCESS\u FINE\u LOCATION);
列表权限=新建ArrayList();
如果(结果!=PackageManager.PERMISSION_已授予){
权限.add(Manifest.permission.ACCESS\u FINE\u位置);
权限.add(Manifest.permission.ACCESS\u\u位置);
}
如果(!permissions.isEmpty()){
if(Build.VERSION.SDK\u INT>=Build.VERSION\u code.M){
requestPermissions(permissions.toArray(新字符串[permissions.size()])、权限\请求\代码);
}
}
然后
@凌驾
public void onRequestPermissionsResult(int-requestCode,字符串权限[],int[]grantResults){
开关(请求代码){
案例权限\请求\代码:
for(int i=0;i
经过一段时间的实验,我终于让它开始工作了
请注意,虽然这个解决方案在我的实验中有效,但我不确定我所做的改变是否真的起作用
我所做的是将onRequestPermissionResult
中的mgoogleapclient.connect()
更改为mgoogleapclient.connect()
。我还将其设置为Override
下面是该方法的最终外观:
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {
case LOCATION_REQUEST_NUMBER: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if(mGoogleApiClient != null) {
mGoogleApiClient.reconnect();
}
} else {
Log.i(LOG_TAG, "Permission denied by user.");
}
}
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
检查下面的答案下面的大多数答案都围绕着添加mGoogleApi。连接到onRequestPermissionResult
。但是应用程序仍然不做任何事情。如果您的服务运行正常,那么将调用onLocationChanged
。您是否尝试过我的答案中提到的两个权限。@SohailZahid不幸的是,onRequestPermissionResult
仍然没有使用两个权限调用。正如您所说,我添加了mgoogleapClient.connect()
,但在授予权限后,应用程序仍然没有执行任何操作。
You should check these permission at time of loading your activity so
that after permission granting , location instance can be initialize
Try to use this one as when we are requesting for permission for location,
we need to request for two permission for ACCESS_FINE_LOCATION and
ACCESS_COURSE_LOCATION.
private static final int PERMISSION_REQUEST_CODE = 1;
private void checkPermission()
{
if(android.os.Build.VERSION.SDK_INT>=23) {
int result = ContextCompat.checkSelfPermission(YourClass.this, Manifest.permission.ACCESS_FINE_LOCATION);
List<String> permissions = new ArrayList<String>();
if( result != PackageManager.PERMISSION_GRANTED ) {
permissions.add( Manifest.permission.ACCESS_FINE_LOCATION );
permissions.add(Manifest.permission.ACCESS_COARSE_LOCATION);
}
if( !permissions.isEmpty() ) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions( permissions.toArray( new String[permissions.size()] ), PERMISSION_REQUEST_CODE );
}
}
and then
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_CODE:
for( int i = 0; i < permissions.length; i++ ) {
if( grantResults[i] == PackageManager.PERMISSION_GRANTED ) {
Log.d( "Permissions", "Permission Granted: " + permissions[i] );
// Here you write your code once permission granted
} else if( grantResults[i] == PackageManager.PERMISSION_DENIED ) {
Log.d( "Permissions", "Permission Denied: " + permissions[i] );
}
}
break;
default: {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {
case LOCATION_REQUEST_NUMBER: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if(mGoogleApiClient != null) {
mGoogleApiClient.reconnect();
}
} else {
Log.i(LOG_TAG, "Permission denied by user.");
}
}
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}