我想在GOOGLE MAP移动标记，而gps位置更改就像在UBER应用中一样。我找到了一些解决方案但无法解决我的问题。解决方案为1和2
以下是我的onLocationChange()方法
public void onLocationChanged(Location location) {
double lattitude = location.getLatitude();
double longitude = location.getLongitude();
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("I am here");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
tv_loc.append("Lattitude: " + lattitude + " Longitude: " + longitude);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
//stop location updates
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
更新1（重新编辑）
为了更多的理解我正在添加更多的代码，但首先我想告诉我在我的应用程序中使用选项卡。第一个tab是我的地图。所以我正在使用片段。
public class MyLocation extends Fragment implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener,
LocationListener{
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker=null;
TextView tv_loc;
private static View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if(view != null)
{
ViewGroup viewGroupParent = (ViewGroup)view.getParent();
if(viewGroupParent !=null)
{
viewGroupParent.removeView(viewGroupParent);
}
}
try{
view = inflater.inflate(R.layout.my_location,container, false);
}catch (Exception e)
{
/* map is already there, just return view as it is */
return view;
}
// inflat and return the layout
//View rootView = inflater.inflate(R.layout.my_location, container, false);
tv_loc = (TextView)view.findViewById(R.id.textView);
mapFrag = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map);
mapFrag.getMapAsync(this);
return view;
}
@Override
public void onPause() {
super.onPause();
//stop location updates when Activity is no longer active
if(mGoogleApiClient !=null)
{
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap=googleMap;
mGoogleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
}
else {
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
double lattitude = location.getLatitude();
double longitude = location.getLongitude();
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
if(mCurrLocationMarker!=null){
mCurrLocationMarker.setPosition(latLng);
}else{
mCurrLocationMarker = mGoogleMap.addMarker(new MarkerOptions()
.position(latLng)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))
.title("I am here"));
}
tv_loc.append("Lattitude: " + lattitude + " Longitude: " + longitude);
mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));
//stop location updates
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
/*double lattitude = location.getLatitude();
double longitude = location.getLongitude();
mLastLocation = location;
if (mCurrLocationMarker != null) {
//mGoogleMap.clear();
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("I am here");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)).draggable(true);
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
mCurrLocationMarker.setPosition(new LatLng(lattitude,longitude));
tv_loc.append("Lattitude: " + lattitude + " Longitude: " + longitude);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
//stop location updates
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}*/
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation 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.
new AlertDialog.Builder(getActivity())
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
/*super.onRequestPermissionsResult(requestCode, permissions, grantResults);*/
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// location-related task you need to do.
if(ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED)
{
if(mGoogleApiClient == null)
{
buildGoogleApiClient();
}
mGoogleMap.setMyLocationEnabled(true);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
//finish();
Toast.makeText(getActivity(), "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
@Override
public void onResume()
{
super.onResume();
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}}
任何帮助都将受到高度赞赏
答案 0 :(得分：14)
您可以使用以下代码更新标记的位置
public void onLocationChanged(Location location) {
double lattitude = location.getLatitude();
double longitude = location.getLongitude();
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
if(mCurrLocationMarker!=null){
mCurrLocationMarker.setPosition(latLng);
}else{
mCurrLocationMarker = mGoogleMap.addMarker(new MarkerOptions()
.position(latLng)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))
.title("I am here");
}
tv_loc.append("Lattitude: " + lattitude + " Longitude: " + longitude);
gMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));
//stop location updates
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
您不需要每次都清除地图。您可以通过将Marker添加到Map时返回的Marker对象来完成。 希望它会对你有所帮助。
答案 1 :(得分：5)
首先在您的Activity中实现LocationListener
如果您只需要显示一个标记（标记的更新位置），请使用：
/*
* linux/arch/nios2/kernel/entry.S
*
* Copyright (C) 2009, Wind River Systems Inc
* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
*
* Based on:
*
* linux/arch/nios2/kernel/entry.S
*
* Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
* Kenneth Albanowski <kjahds@kjahds.com>,
* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
* Copyright (C) 2004 Microtronix Datacom Ltd.
*
* Based on:
*
* linux/arch/m68knommu/kernel/entry.S
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file README.legal in the main directory of this archive
* for more details.
*
* Linux/m68k support by Hamish Macdonald
*
* 68060 fixes by Jesper Skov
* ColdFire support by Greg Ungerer (gerg@snapgear.com)
* 5307 fixes by David W. Miller
* linux 2.4 support David McCullough <davidm@snapgear.com>
*/
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/asm-macros.h>
#include <asm/thread_info.h>
#include <asm/errno.h>
#include <asm/setup.h>
#include <asm/entry.h>
#include <asm/unistd.h>
#include <asm/processor.h>
.macro GET_THREAD_INFO reg
.if THREAD_SIZE & 0xffff0000
andhi \reg, sp, %hi(~(THREAD_SIZE-1))
.else
addi \reg, r0, %lo(~(THREAD_SIZE-1))
and \reg, \reg, sp
.endif
.endm
/* FIXME: Lots of these exceptions need to be handled */
.section .rodata
.align 4
exception_table:
.word unhandled_exception /* 0 - Reset */
.word unhandled_exception /* 1 - Processor-only Reset */
.word external_interrupt /* 2 - Interrupt */
.word handle_trap /* 3 - Trap Instruction */
.word instruction_trap /* 4 - Unimplemented instruction */
.word handle_illegal /* 5 - Illegal instruction */
.word handle_unaligned /* 6 - Misaligned data access */
.word handle_unaligned /* 7 - Misaligned destination address */
.word handle_diverror /* 8 - Division error */
.word protection_exception_ba /* 9 - Supervisor-only instr. address */
.word protection_exception_instr /* 10 - Supervisor only instruction */
.word protection_exception_ba /* 11 - Supervisor only data address */
.word unhandled_exception /* 12 - Double TLB miss (data) */
.word protection_exception_pte /* 13 - TLB permission violation (x) */
.word protection_exception_pte /* 14 - TLB permission violation (r) */
.word protection_exception_pte /* 15 - TLB permission violation (w) */
.word unhandled_exception /* 16 - MPU region violation */
trap_table:
.word handle_system_call // 0
.word instruction_trap // 1
.word instruction_trap // 2
.word instruction_trap // 3
.word instruction_trap // 4
.word instruction_trap // 5
.word instruction_trap // 6
.word instruction_trap // 7
.word instruction_trap // 8
.word instruction_trap // 9
.word instruction_trap // 10
.word instruction_trap // 11
.word instruction_trap // 12
.word instruction_trap // 13
.word instruction_trap // 14
.word instruction_trap // 15
.word instruction_trap // 16
.word instruction_trap // 17
.word instruction_trap // 18
.word instruction_trap // 19
.word instruction_trap // 20
.word instruction_trap // 21
.word instruction_trap // 22
.word instruction_trap // 23
.word instruction_trap // 24
.word instruction_trap // 25
.word instruction_trap // 26
.word instruction_trap // 27
.word instruction_trap // 28
.word instruction_trap // 29
#ifdef CONFIG_KGDB
.word handle_kgdb_breakpoint /* 30 KGDB breakpoint */
#else
.word instruction_trap // 30
#endif
.word handle_breakpoint // 31
.text
.set noat
.set nobreak
ENTRY(inthandler)
SAVE_ALL
/* Clear EH bit before we get a new excpetion in the kernel
* and after we have saved it to the exception frame. This is done
* wheter it's trap, tlb-miss or interrupt. If we don't do this
* estatus is not updated the next exception.
*/
rdctl r24,status
movi r9,-5
and r24,r24,r9
wrctl status,r24
/* Read cause and vector and branch to the associated handler (
*/
mov r4,sp
rdctl r5,exception
movia r9,exception_table
add r24,r9,r5
ldw r24,0(r24)
jmp r24
/***********************************************************************
* Handle traps
***********************************************************************
*/
ENTRY(handle_trap)
ldw r24,-4(ea) // instruction that caused the exception
srli r24,r24,4
andi r24,r24,0x7c
movia r9,trap_table
add r24,r24,r9
ldw r24,0(r24)
jmp r24
/***********************************************************************
* Handle system calls
***********************************************************************
*/
ENTRY(handle_system_call)
/* Enable interrupts
*/
rdctl r10,status
ori r10,r10,0x0001
wrctl status,r10
/* Reload registers destroyed by common code.
*/
ldw r4,PT_R4(sp)
ldw r5,PT_R5(sp)
/* Check that the requested system call is within limits
*/
movui r1,NR_syscalls
bgeu r2,r1,ret_invsyscall
slli r1,r2,2
movhi r11,%hiadj(sys_call_table)
add r1,r1,r11
ldw r1,%lo(sys_call_table)(r1)
beq r1,r0,ret_invsyscall
/* Get thread info pointer
*/
movi r11,%lo(0xfffff000)
and r11,sp,r11
ldw r11,TI_FLAGS(r11)
/* If someone is ptrace:ing us, take the long way.
*/
BTBNZ r11,r11,TIF_SYSCALL_TRACE,traced_system_call
#if 0
SAVE_SWITCH_STACK
mov r9,r8
mov r8,r7
mov r6,r5
mov r5,r4
mov r4,r2
call print_syscall
RESTORE_SWITCH_STACK
ldw r2,PT_R2(sp)
ldw r4,PT_R4(sp)
ldw r5,PT_R5(sp)
ldw r6,PT_R6(sp)
ldw r7,PT_R7(sp)
ldw r8,PT_R8(sp)
ldw r9,PT_R9(sp)
#endif
/* Execute the system call
*/
callr r1
/* If the syscall returns a negative result:
* Set r7 to 1 to indicate error,
* Negate r2 to get a positive error code
* If the syscall returns zero or a positive value:
* Set r7 to 0.
* The sigreturn system calls will skip the code below by
* adding to register ra. To avoid destroying registers
*
* FIXME: We probably need an orig_r7
*/
translate_rc_and_ret:
movi r1,0
bge r2,zero,3f
sub r2,zero,r2
movi r1,1
3:
stw r2,PT_R2(sp)
stw r1,PT_R7(sp)
end_translate_rc_and_ret:
#if 0
SAVE_SWITCH_STACK
mov r4,r2
mov r5,r1
call print_syscall_ret
RESTORE_SWITCH_STACK
#endif
ret_from_exception:
ldw r1,PT_ESTATUS(sp)
TSTBNZ r1,r1,ESTATUS_EU,Luser_return /* if so, skip resched, signals */
restore_all:
rdctl r10,status /* disable intrs */
andi r10,r10,0xfffe
wrctl status, r10
RESTORE_ALL
eret
/* If the syscall number was invalid return ENOSYS
*/
ret_invsyscall:
movi r2,-ENOSYS
br translate_rc_and_ret
/* This implements the same as above, except it calls
* syscall_trace before and after the syscall in order
* for utilities like strace and gdb to work.
*/
traced_system_call:
SAVE_SWITCH_STACK
call syscall_trace
RESTORE_SWITCH_STACK
/* r2 and r7-r9 might be destroyed by syscall_trace and we need to restore
* them before calling our syscall.
*/
ldw r2,PT_R2(sp)
ldw r4,PT_R4(sp)
ldw r5,PT_R5(sp)
ldw r6,PT_R6(sp)
ldw r7,PT_R7(sp)
ldw r8,PT_R8(sp)
ldw r9,PT_R9(sp)
/* Fetch the syscall function, we don't need to check the boundaries
* since this is already done.
*/
slli r1,r2,2
movhi r11,%hiadj(sys_call_table)
add r1,r1,r11
ldw r1,%lo(sys_call_table)(r1)
callr r1
/* If the syscall returns a negative result:
* Set r7 to 1 to indicate error,
* Negate r2 to get a positive error code
* If the syscall returns zero or a positive value:
* Set r7 to 0.
* The sigreturn system calls will skip the code below by
* adding to register ra. To avoid destroying registers
*
* FIXME: We probably need an orig_r7
*/
translate_rc_and_ret2:
movi r1,0
bge r2,zero,4f
sub r2,zero,r2
movi r1,1
4:
stw r2,PT_R2(sp)
stw r1,PT_R7(sp)
end_translate_rc_and_ret2:
SAVE_SWITCH_STACK
call syscall_trace
RESTORE_SWITCH_STACK
br ret_from_exception
Luser_return:
GET_THREAD_INFO r11 /* get thread_info pointer */
ldw r10,TI_FLAGS(r11) /* get thread_info->flags */
ANDI32 r11,r10,_TIF_WORK_MASK
beq r11,r0,restore_all /* Nothing to do */
BTBZ r1,r10,TIF_NEED_RESCHED,Lsignal_return
Lwork_resched:
call schedule
br ret_from_exception
Lsignal_return:
BTBZ r1,r10,TIF_SIGPENDING,restore_all
mov r5,sp /* pt_regs */
SAVE_SWITCH_STACK
mov r4,r0 /* oldset = 0 */
movi r6,1 /* syscall */
call do_signal
RESTORE_SWITCH_STACK
br restore_all
/***********************************************************************
* Handle external interrupts.
***********************************************************************
*/
/*
* This is the generic interrupt handler (for all hardware interrupt
* sources). It figures out the vector number and calls the appropriate
* interrupt service routine directly.
*/
external_interrupt:
rdctl r12,ipending
rdctl r9,ienable
and r12,r12,r9
/* skip if no interrupt is pending */
beq r12,r0,ret_from_interrupt
movi r24,-1
stw r24,PT_ORIG_R2(sp)
/*
* Process an external hardware interrupt.
*/
addi ea,ea,-4 /* re-issue the interrupted instruction */
stw ea,PT_EA(sp)
2: movi r4,%lo(-1) /* Start from bit position 0, highest priority */
/* This is the IRQ # for handler call */
1: andi r10,r12,1 /* Isolate bit we are interested in */
srli r12,r12,1 /* shift count is costly without hardware multiplier */
addi r4,r4,1
beq r10,r0,1b
mov r5,sp /* Setup pt_regs pointer for handler call */
call do_IRQ
rdctl r12,ipending /* check again if irq still pending */
rdctl r9,ienable /* Isolate possible interrupts */
and r12,r12,r9
bne r12,r0,2b
/* br ret_from_interrupt */ /* fall throught to ret_from_interrupt */
ENTRY(ret_from_interrupt)
ldw r1,PT_ESTATUS(sp) /* check if returning to kernel */
TSTBNZ r1,r1,ESTATUS_EU,Luser_return
#ifdef CONFIG_PREEMPT
GET_THREAD_INFO r1
ldw r4,TI_PREEMPT_COUNT(r1)
bne r4,r0,restore_all
need_resched:
ldw r4,TI_FLAGS(r1) // ? Need resched set
BTBZ r10,r4,TIF_NEED_RESCHED,restore_all
ldw r4,PT_ESTATUS(sp) // ? Interrupts off
andi r10,r4,STATUS_PIE
beq r10,r0,restore_all
movia r4,PREEMPT_ACTIVE
stw r4,TI_PREEMPT_COUNT(r1)
rdctl r10,status /* enable intrs again */
ori r10,r10,0x0001
wrctl status,r10
PUSH r1
call schedule
POP r1
mov r4,r0
stw r4,TI_PREEMPT_COUNT(r1)
rdctl r10,status /* disable intrs */
andi r10,r10,0xfffe
wrctl status, r10
br need_resched
#else
br restore_all
#endif
/***********************************************************************
* Syscalls implemented in assembly
***********************************************************************
*/
ENTRY(sys_nios2cmpxchg)
// r4 pointer to exchange variable
// r5 old value
// r6 new value
// r8 - old interrupt status (assert this to enabled?)
// r9 - temp
// Disable interrupts (keep old status in r8)
rdctl r8,status
andi r9,r8,0xfffe
wrctl status,r9
// Make sure we skip the r2/r7 translation code when we return.
addi ra,ra,(end_translate_rc_and_ret-translate_rc_and_ret)
ldw1: ldw r2, 0(r4)
bne r2, r5, .L6
// We had a match, store the new value
stw1: stw r6, 0(r4)
.L6:
// Reenable interrupts
wrctl status,r8
// Store return value
stw r2,PT_R2(sp)
// Indicate everything is ok
movi r2,0
stw r2,PT_R7(sp)
ret
fault:
movi r2,EFAULT
stw r2,PT_R2(sp)
movi r2,1
stw r2,PT_R7(sp)
wrctl status,r8
ret
// setup the exception table
.section __ex_table,"a"
.word ldw1, fault
.word stw1, fault
.previous
/***********************************************************************
* A few syscall wrappers
***********************************************************************
*/
ENTRY(sys_fork)
mov r4,sp
SAVE_SWITCH_STACK
call nios2_fork
RESTORE_SWITCH_STACK
ret
ENTRY(sys_vfork)
mov r4,sp
SAVE_SWITCH_STACK
call nios2_vfork
RESTORE_SWITCH_STACK
ret
ENTRY(sys_execve)
mov r4,sp
SAVE_SWITCH_STACK
call nios2_execve
RESTORE_SWITCH_STACK
ret
ENTRY(sys_clone)
mov r4,sp
SAVE_SWITCH_STACK
call nios2_clone
RESTORE_SWITCH_STACK
ret
ENTRY(sys_sigsuspend)
mov r4,sp
SAVE_SWITCH_STACK
call do_sigsuspend
RESTORE_SWITCH_STACK
ret
ENTRY(sys_rt_sigsuspend)
mov r4,sp
SAVE_SWITCH_STACK
call do_rt_sigsuspend
RESTORE_SWITCH_STACK
ret
ENTRY(sys_sigreturn)
mov r4,sp
SAVE_SWITCH_STACK
call do_sigreturn
RESTORE_SWITCH_STACK
addi ra,ra,(end_translate_rc_and_ret-translate_rc_and_ret)
ret
ENTRY(sys_sigaltstack)
ldw r4,PT_R4(sp)
ldw r5,PT_R5(sp)
ldw r6,PT_SP(sp)
SAVE_SWITCH_STACK
call do_sigaltstack
RESTORE_SWITCH_STACK
ret
ENTRY(sys_rt_sigreturn)
SAVE_SWITCH_STACK
mov r4,sp
call do_rt_sigreturn
RESTORE_SWITCH_STACK
addi ra,ra,(end_translate_rc_and_ret-translate_rc_and_ret)
ret
/***********************************************************************
* A few other wrappers and stubs
***********************************************************************
*/
protection_exception_pte:
rdctl r6,pteaddr
slli r6,r6,10
call do_page_fault
br ret_from_exception
protection_exception_ba:
rdctl r6,badaddr
call do_page_fault
br ret_from_exception
protection_exception_instr:
call handle_supervisor_instr
br ret_from_exception
handle_breakpoint:
call breakpoint_c
br ret_from_exception
#ifdef CONFIG_ALIGNMENT_TRAP
handle_unaligned:
SAVE_SWITCH_STACK
call handle_unaligned_c
RESTORE_SWITCH_STACK
br ret_from_exception
#else
handle_unaligned:
call handle_unaligned_c
br ret_from_exception
#endif
handle_illegal:
call handle_illegal_c
br ret_from_exception
handle_diverror:
call handle_diverror_c
br ret_from_exception
#ifdef CONFIG_KGDB
handle_kgdb_breakpoint:
call kgdb_breakpoint_c
br ret_from_exception
#endif
/*
* Beware - when entering resume, prev (the current task) is
* in r4, next (the new task) is in r5, don't change these
* registers.
*/
ENTRY(resume)
rdctl r7,status /* save thread status reg */
stw r7,TASK_THREAD+THREAD_KPSR(r4)
andi r7,r7,0x0fffe /* disable interrupts */
wrctl status,r7
SAVE_SWITCH_STACK
stw sp,TASK_THREAD+THREAD_KSP(r4) /* save kernel stack pointer */
ldw sp,TASK_THREAD+THREAD_KSP(r5) /* restore new thread stack */
movia r24,_current_thread /* save thread */
GET_THREAD_INFO r1
stw r1,0(r24)
RESTORE_SWITCH_STACK
ldw r7,TASK_THREAD+THREAD_KPSR(r5) /* restore thread status reg */
wrctl status,r7
ret
ENTRY(ret_from_fork)
call schedule_tail
br ret_from_exception
或者如果您想每次添加新标记：
$ setarch i386 make -j1 V=1make -f tools/autotools.mk autotools-cache
...
/bin/bash /home/developer/altera/nios2-linux/linux-2.6/scripts/checksyscalls.sh nios2-linux-gnu-gcc -Wp,-MD,./.missing-syscalls.d -nostdinc -isystem /opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/include -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/include -Iarch/nios2/include/generated -Iinclude -I/home/developer/altera/nios2-linux/linux-2.6/include -include /home/developer/altera/nios2-linux/linux-2.6/include/linux/kconfig.h -I/home/developer/altera/nios2-linux/linux-2.6/. -I. -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -pipe -D__linux__ -D__ELF__ -mhw-mul -mno-hw-mulx -mhw-div -fno-optimize-sibling-calls -DUTS_SYSNAME=\"Linux\" -fno-builtin -G 0 -Wno-unused-but-set-variable -fomit-frame-pointer -Wdeclaration-after-statement -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(missing_syscalls)" -D"KBUILD_MODNAME=KBUILD_STR(missing_syscalls)"
make -f /home/developer/altera/nios2-linux/linux-2.6/scripts/Makefile.build obj=init
make -f /home/developer/altera/nios2-linux/linux-2.6/scripts/Makefile.build obj=usr
make -f /home/developer/altera/nios2-linux/linux-2.6/scripts/Makefile.build obj=arch/nios2/kernel
make -f /home/developer/altera/nios2-linux/linux-2.6/scripts/Makefile.build obj=arch/nios2/mm
/bin/bash /home/developer/altera/nios2-linux/linux-2.6/scripts/gen_initramfs_list.sh -l -d > usr/.initramfs_data.cpio.d
make -f /home/developer/altera/nios2-linux/linux-2.6/scripts/Makefile.build obj=arch/nios2/platform
(cat /dev/null; ) > usr/modules.order
nios2-linux-gnu-gcc -Wp,-MD,arch/nios2/kernel/.entry.o.d -nostdinc -isystem /opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/include -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/include -Iarch/nios2/include/generated -Iinclude -I/home/developer/altera/nios2-linux/linux-2.6/include -include /home/developer/altera/nios2-linux/linux-2.6/include/linux/kconfig.h -D__KERNEL__ -D__ASSEMBLY__ -c -o arch/nios2/kernel/entry.o /home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/entry.S
/bin/bash /home/developer/altera/nios2-linux/linux-2.6/scripts/mkcompile_h include/generated/compile.h \
"nios2" "" "" "nios2-linux-gnu-gcc -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -pipe -D__linux__ -D__ELF__ -mhw-mul -mno-hw-mulx -mhw-div -fno-optimize-sibling-calls -DUTS_SYSNAME=\"Linux\" -fno-builtin -G 0 -Wno-unused-but-set-variable -fomit-frame-pointer -Wdeclaration-after-statement "
/bin/bash /home/developer/altera/nios2-linux/linux-2.6/scripts/gen_initramfs_list.sh -o usr/initramfs_data.cpio -d
(cat /dev/null; ) > init/modules.order
nios2-linux-gnu-gcc -Wp,-MD,arch/nios2/kernel/.ptrace.o.d -nostdinc -isystem /opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/include -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/include -Iarch/nios2/include/generated -Iinclude -I/home/developer/altera/nios2-linux/linux-2.6/include -include /home/developer/altera/nios2-linux/linux-2.6/include/linux/kconfig.h -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel -Iarch/nios2/kernel -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -pipe -D__linux__ -D__ELF__ -mhw-mul -mno-hw-mulx -mhw-div -fno-optimize-sibling-calls -DUTS_SYSNAME=\"Linux\" -fno-builtin -G 0 -Wno-unused-but-set-variable -fomit-frame-pointer -Wdeclaration-after-statement -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(ptrace)" -D"KBUILD_MODNAME=KBUILD_STR(ptrace)" -c -o arch/nios2/kernel/ptrace.o /home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/ptrace.c
nios2-linux-gnu-gcc -Wp,-MD,arch/nios2/kernel/.setup.o.d -nostdinc -isystem /opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/include -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/include -Iarch/nios2/include/generated -Iinclude -I/home/developer/altera/nios2-linux/linux-2.6/include -include /home/developer/altera/nios2-linux/linux-2.6/include/linux/kconfig.h -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel -Iarch/nios2/kernel -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -pipe -D__linux__ -D__ELF__ -mhw-mul -mno-hw-mulx -mhw-div -fno-optimize-sibling-calls -DUTS_SYSNAME=\"Linux\" -fno-builtin -G 0 -Wno-unused-but-set-variable -fomit-frame-pointer -Wdeclaration-after-statement -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(setup)" -D"KBUILD_MODNAME=KBUILD_STR(setup)" -c -o arch/nios2/kernel/setup.o /home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/setup.c
nios2-linux-gnu-gcc -Wp,-MD,arch/nios2/kernel/.signal.o.d -nostdinc -isystem /opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/include -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/include -Iarch/nios2/include/generated -Iinclude -I/home/developer/altera/nios2-linux/linux-2.6/include -include /home/developer/altera/nios2-linux/linux-2.6/include/linux/kconfig.h -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel -Iarch/nios2/kernel -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -pipe -D__linux__ -D__ELF__ -mhw-mul -mno-hw-mulx -mhw-div -fno-optimize-sibling-calls -DUTS_SYSNAME=\"Linux\" -fno-builtin -G 0 -Wno-unused-but-set-variable -fomit-frame-pointer -Wdeclaration-after-statement -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(signal)" -D"KBUILD_MODNAME=KBUILD_STR(signal)" -c -o arch/nios2/kernel/signal.o /home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/signal.c
/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/entry.S: Assembler messages:
/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/entry.S:138: Error: expecting control register
/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/entry.S:138: Error: unknown register r5
/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/entry.S:546: Error: expecting control register
/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/kernel/entry.S:546: Error: unknown register r6
(cat /dev/null; ) > arch/nios2/mm/modules.order
make[3]: *** [arch/nios2/kernel/entry.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make -f /home/developer/altera/nios2-linux/linux-2.6/scripts/Makefile.build obj=arch/nios2/boot
make -f /home/developer/altera/nios2-linux/linux-2.6/scripts/Makefile.build obj=kernel
(cat /dev/null; ) > arch/nios2/platform/modules.order
(cat /dev/null; ) > arch/nios2/boot/modules.order
/home/developer/altera/nios2-linux/uClinux-dist/linux-2.6.x/scripts/dtc/dtc -O dtb -o arch/nios2/boot/system.dtb -b 0 -d arch/nios2/boot/.system.dtb.d /home/developer/Downloads/nios.dts
DTC: dts->dtb on file "/home/developer/Downloads/nios.dts"
nios2-linux-gnu-gcc -Wp,-MD,arch/nios2/boot/.linked_dtb.o.d -nostdinc -isystem /opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/include -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/include -Iarch/nios2/include/generated -Iinclude -I/home/developer/altera/nios2-linux/linux-2.6/include -include /home/developer/altera/nios2-linux/linux-2.6/include/linux/kconfig.h -D__KERNEL__ -D__ASSEMBLY__ -c -o arch/nios2/boot/linked_dtb.o /home/developer/altera/nios2-linux/linux-2.6/arch/nios2/boot/linked_dtb.S
make[2]: *** [arch/nios2/kernel] Error 2
make[2]: *** Waiting for unfinished jobs....
nios2-linux-gnu-gcc -Wp,-MD,usr/.initramfs_data.o.d -nostdinc -isystem /opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/include -I/home/developer/altera/nios2-linux/linux-2.6/arch/nios2/include -Iarch/nios2/include/generated -Iinclude -I/home/developer/altera/nios2-linux/linux-2.6/include -include /home/developer/altera/nios2-linux/linux-2.6/include/linux/kconfig.h -D__KERNEL__ -D__ASSEMBLY__ -DINITRAMFS_IMAGE="usr/initramfs_data.cpio" -c -o usr/initramfs_data.o /home/developer/altera/nios2-linux/linux-2.6/usr/initramfs_data.S
nios2-linux-gnu-ld -mnios2elf -r -o arch/nios2/boot/built-in.o arch/nios2/boot/linked_dtb.o
nios2-linux-gnu-ld -mnios2elf -r -o usr/built-in.o usr/initramfs_data.o
make[2]: *** wait: No child processes. Stop.
make[1]: *** [sub-make] Error 2
make[1]: Leaving directory `/home/developer/altera/nios2-linux/linux-2.6'
make: *** [linux] Error 1
如果位置快速更改，您的应用需要几秒钟才能更新其位置标记
答案 2 :(得分：3)
这可以使用CameraPosition，googleMap.animateCamera和使用线性插值器的标记移动动画来完成。
本教程使用谷歌地图v2。希望这会有所帮助。
答案 3 :(得分：3)
使用此：
在地图活动中实施LocationListener ,GoogleMap.OnMyLocationChangeListener，然后使用位置更改收听者
@Override
public void onMyLocationChange(Location location) {
//mMap.clear //if you want refresh map remove comment
// Getting latitude of the current location
double latitude = location.getLatitude();
// Getting longitude of the current location
double longitude =location.getLongitude();
// Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude); //your_text_view.settext(latitude+","+longtitudde)
// Showing the current location in Google Map
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.addMarker(new MarkerOptions().icon(BitmapDescriptorFactory.fromResource(R.drawable.destination_marker)).position(latLng).title(maping_status));
// Zoom in the Google Map
mMap.animateCamera(CameraUpdateFactory.zoomTo(20));
}
答案 4 :(得分：2)
为了动画，只需使用之前的位置和新位置以及标记对象调用此方法（ animateMarker ）
private Marker mCurrentMarker;
private float ZOOMLEVEL=18.0f;
private LatLng previousLatLon;
private Handler mLocalHandler;
private GoogleMap mGoogleMap;
public void animateMarker(final Marker marker, final LatLng toPosition,final LatLng fromPosition) {
final long duration = 500;
final Interpolator interpolator = new LinearInterpolator();
mLocalHandler.post(new Runnable() {
@Override
public void run() {
long elapsed = SystemClock.uptimeMillis() - mStartTime;
float t = interpolator.getInterpolation((float) elapsed
/ duration);
marker.setPosition(toPosition);
marker.setAnchor(Constants.MAPANCHOR, Constants.MAPANCHOR);
mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(toPosition, ZOOMLEVEL));
if (t < 1.0) {
// Post again 16ms later.
mLocalHandler.postDelayed(this, 16);
} else {
marker.setVisible(true);
}
}
}
});
previousLatLon=toPosition;// reassign the previous location to current location
}
答案 5 :(得分：0)
希望这个答案能帮到你。而不是gps使用Google Fused Api Read Documentation Here For Fused Api 并阅读本答案 how To Make Bus Marker Move
尝试使用此教程链接以更好地理解Fused Api Example
答案 6 :(得分：0)
在清单中添加这些行
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
然后使用此类
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
GoogleMap mgoogleMap;
GoogleApiClient mgoogleApi;
Context context;
Marker marker;
LocationRequest locationrequest;
public static final int map=1111;
public static final int coarse=1112;
@Override
protected void onCreate(Bundle savedInstanceState) {
if (googleServiceAvalable()) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = getApplicationContext();
checkReadPermission();
checkCoarsePermission();
initMap();
} else {
}
}
public boolean googleServiceAvalable() {
GoogleApiAvailability api = GoogleApiAvailability.getInstance();
int isavailable = api.isGooglePlayServicesAvailable(this);
if (isavailable == ConnectionResult.SUCCESS) {
return true;
} else if (api.isUserResolvableError(isavailable)) {
Dialog dialog = api.getErrorDialog(this, isavailable, 0);
dialog.show();
} else {
Toast.makeText(this, "cant connect to play services", Toast.LENGTH_LONG).show();
}
return false;
}
private void initMap() {
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.fragment);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mgoogleMap = googleMap;
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
}
mgoogleMap.setMyLocationEnabled(true);
if(checkCoarsePermission() && checkReadPermission()){
mgoogleApi = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mgoogleApi.connect();
}else {
checkReadPermission();
checkCoarsePermission();
}
}
private void goToLocation(double latitude, double longitude, int i) {
LatLng ll = new LatLng(latitude, longitude);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, i);
mgoogleMap.animateCamera(update);
if(marker !=null){
marker.remove();
}
MarkerOptions options =new MarkerOptions()
.title("Test")
.draggable(true)
.position(new LatLng(latitude,longitude ));
marker= mgoogleMap.addMarker(options);
}
@Override
public void onConnected(@Nullable Bundle bundle) {
locationrequest = new LocationRequest().create();
locationrequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationrequest.setInterval(1000);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mgoogleApi, locationrequest, this);
Toast.makeText(context,"Location Connected and ready to publish",Toast.LENGTH_SHORT).show();
}
@Override
public void onConnectionSuspended(int i) {
Toast.makeText(context,"Location Connection Suspended",Toast.LENGTH_SHORT);
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Toast.makeText(context,"Location Connection Failed"+connectionResult.getErrorMessage(),Toast.LENGTH_SHORT);
}
@Override
public void onLocationChanged(Location location) {
if(location==null){
Toast.makeText(context,"Cant Find User Location",Toast.LENGTH_SHORT);
}else {
LatLng ll=new LatLng(location.getLatitude(),location.getLongitude());
goToLocation(ll.latitude,ll.longitude,18);
}
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public boolean checkReadPermission() {
int currentAPIVersion = Build.VERSION.SDK_INT;
if (currentAPIVersion >= android.os.Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION)) {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(MainActivity.this);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Permission necessary");
alertBuilder.setMessage("Read Internal Storage permission required to display images!!!");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions((Activity) MainActivity.this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, map);
}
});
AlertDialog alert = alertBuilder.create();
alert.show();
} else {
ActivityCompat.requestPermissions((Activity) MainActivity.this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, map);
}
return false;
} else {
return true;
}
} else {
return true;
}
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public boolean checkCoarsePermission() {
int currentAPIVersion = Build.VERSION.SDK_INT;
if (currentAPIVersion >= android.os.Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) MainActivity.this, android.Manifest.permission.ACCESS_COARSE_LOCATION)) {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(MainActivity.this);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Permission necessary");
alertBuilder.setMessage("Read Internal Storage permission required to display images!!!");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions((Activity) MainActivity.this, new String[]{android.Manifest.permission.ACCESS_COARSE_LOCATION}, coarse);
}
});
AlertDialog alert = alertBuilder.create();
alert.show();
} else {
ActivityCompat.requestPermissions((Activity) MainActivity.this, new String[]{android.Manifest.permission.ACCESS_COARSE_LOCATION}, coarse);
}
return false;
} else {
return true;
}
} else {
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
int[] grantResults) {
switch (requestCode) {
case map:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
} else {
Toast.makeText(context,"You have to give permission",Toast.LENGTH_SHORT).show();
}
break;
case coarse:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
} else {
Toast.makeText(context,"You have to give permission",Toast.LENGTH_SHORT).show();
}
break;
}
}}
答案 7 :(得分：0)
如果您仍在寻找解决方案，希望此https://www.youtube.com/watch?v=WKfZsCKSXVQ能为您提供帮助。我在其中一个应用中使用了此功能，它可以帮助将标记从一个位置动画到其他位置。 可以在此处抓取源代码https://gist.github.com/broady/6314689。
您可能需要向标记添加旋转以显示标记的确切方向。以下是我用来查找方位的代码块。
private float bearingBetweenLatLngs(LatLng begin, LatLng end) {
Location beginL = convertLatLngToLocation(begin);
Location endL = convertLatLngToLocation(end);
return beginL.bearingTo(endL);
}