Java 谷歌地图无法使用计时器删除标记
我在更新Java 谷歌地图无法使用计时器删除标记,java,android,google-maps,Java,Android,Google Maps,我在更新谷歌地图上的当前标记时遇到问题。这些标记是在活动开始时创建的。我将所有merker保存到arraylist中。然后我设置了一个计时器,每10秒重新绘制这些标记 然而,系统给了我这个错误: 02-26 15:33:53.295:E/AndroidRuntime(21337):java.lang.IllegalStateException:不在主线程上 似乎无法触发删除函数,因为计时器不是主线程 我该怎么办 代码如下: public class Discover extends Activi
谷歌地图上的当前标记时遇到问题。这些标记是在活动开始时创建的。我将所有merker保存到arraylist
中。然后我设置了一个计时器,每10秒重新绘制这些标记
然而,系统给了我这个错误:
02-26 15:33:53.295:E/AndroidRuntime(21337):java.lang.IllegalStateException:不在主线程上
似乎无法触发删除函数,因为计时器不是主线程
我该怎么办
代码如下:
public class Discover extends Activity{
GoogleMap googleMap;
PendingIntent pendingIntent;
SharedPreferences sharedPreferences;
ArrayList<Marker> marker1 = new ArrayList<Marker>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// create timer
MyTimerTask myTask = new MyTimerTask(this);
Timer myTimer = new Timer();
myTimer.schedule(myTask, 10000, 10000);
setContentView(R.layout.activity_discover);
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
initialMap(this.getBaseContext());
drawFriendPosition(this.getBaseContext());
}
private void drawFriendPosition(Context ctx){
int i = 0;
Cursor c = ctx.getContentResolver().query(DataProvider.CONTENT_URI_PROFILE, null, null, null, null);
while(c.moveToNext()){
Marker melbourne = googleMap.addMarker(new MarkerOptions().position( new LatLng(Double.parseDouble(latitude), Double.parseDouble(longitude))));
marker1.add(melbourne);
}
}
private void removeFriendPosition(){
Log.i("Marker's length:", ""+marker1.size());
Iterator<Marker> iterator = marker1.iterator();
while (iterator.hasNext()) {
iterator.next().remove();
}
iterator = marker2.iterator();
while (iterator.hasNext()) {
iterator.next().remove();
}
}
private void initialMap(Context ctx){
}
class MyTimerTask extends TimerTask {
Discover discover = null;
public MyTimerTask(Discover d) {
this.discover = d;
}
public void run() {
this.discover.removeFriendPosition();
this.discover.drawFriendPosition(this.getBaseContext());
}
}
}
公共类发现扩展活动{
谷歌地图谷歌地图;
下垂的下垂的;
SharedReferences SharedReferences;
ArrayList marker1=新的ArrayList();
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//创建计时器
MyTimerTask myTask=新的MyTimerTask(此);
计时器myTimer=新计时器();
myTimer.schedule(myTask,10000,10000);
setContentView(R.layout.activity\u discover);
googleMap=((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
initialMap(this.getBaseContext());
drawFriendPosition(this.getBaseContext());
}
私有位置(上下文ctx){
int i=0;
游标c=ctx.getContentResolver().query(DataProvider.CONTENT\u URI\u PROFILE,null,null,null);
而(c.moveToNext()){
Marker melbourne=googleMap.addMarker(新的MarkerOptions().position(新的LatLng(Double.parseDouble(纬度)、Double.parseDouble(经度)));
marker1.add(墨尔本);
}
}
私有void removeFriendPosition(){
Log.i(“标记的长度:”,“+marker1.size());
迭代器迭代器=marker1.Iterator();
while(iterator.hasNext()){
iterator.next().remove();
}
迭代器=marker2.iterator();
while(iterator.hasNext()){
iterator.next().remove();
}
}
私有void初始映射(上下文ctx){
}
类MyTimerTask扩展了TimerTask{
Discover=null;
公共MyTimerTask(发现d){
这个发现=d;
}
public void run(){
this.discover.removeFriendPosition();
this.discover.drawFriendPosition(this.getBaseContext());
}
}
}
试试这个,在MyTimerTask的run(){…}中添加这个代码
runOnUiThread(new Runnable(){
@Override
public void run() {
this.discover.removeFriendPosition();
this.discover.drawFriendPosition(this.getBaseContext());
}
});
如果这不起作用,我建议使用Handler.postdayed代替TimerTask试试看,在MyTimerTask的run(){…}中添加这段代码
runOnUiThread(new Runnable(){
@Override
public void run() {
this.discover.removeFriendPosition();
this.discover.drawFriendPosition(this.getBaseContext());
}
});
如果这不起作用,我建议使用Handler.postdayed代替TimerTask我改为Handler代替TimerTask
它起作用了
此处代码:
public class Discover extends Activity{
GoogleMap googleMap;
PendingIntent pendingIntent;
SharedPreferences sharedPreferences;
ArrayList<Marker> marker1 = new ArrayList<Marker>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
removeFriendPosition();
drawFriendPosition();
}
}, 10000);
setContentView(R.layout.activity_discover);
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
initialMap(this.getBaseContext());
drawFriendPosition(this.getBaseContext());
}
private void drawFriendPosition(){
int i = 0;
Cursor c = this.getBaseContext().getContentResolver().query(DataProvider.CONTENT_URI_PROFILE, null, null, null, null);
while(c.moveToNext()){
Marker melbourne = googleMap.addMarker(new MarkerOptions().position( new LatLng(Double.parseDouble(latitude), Double.parseDouble(longitude))));
marker1.add(melbourne);
}
}
private void removeFriendPosition(){
Log.i("Marker's length:", ""+marker1.size());
Iterator<Marker> iterator = marker1.iterator();
while (iterator.hasNext()) {
iterator.next().remove();
}
iterator = marker2.iterator();
while (iterator.hasNext()) {
iterator.next().remove();
}
}
private void initialMap(Context ctx){
}
}
公共类发现扩展活动{
谷歌地图谷歌地图;
下垂的下垂的;
SharedReferences SharedReferences;
ArrayList marker1=新的ArrayList();
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
Handler=newhandler();
handler.postDelayed(新的Runnable(){
@凌驾
public void run(){
removeFriendPosition();
drawFriendPosition();
}
}, 10000);
setContentView(R.layout.activity\u discover);
googleMap=((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
initialMap(this.getBaseContext());
drawFriendPosition(this.getBaseContext());
}
私有void drawFriendPosition(){
int i=0;
游标c=this.getBaseContext().getContentResolver().query(DataProvider.CONTENT\u URI\u PROFILE,null,null,null);
而(c.moveToNext()){
Marker melbourne=googleMap.addMarker(新的MarkerOptions().position(新的LatLng(Double.parseDouble(纬度)、Double.parseDouble(经度)));
marker1.add(墨尔本);
}
}
私有void removeFriendPosition(){
Log.i(“标记的长度:”,“+marker1.size());
迭代器迭代器=marker1.Iterator();
while(iterator.hasNext()){
iterator.next().remove();
}
迭代器=marker2.iterator();
while(iterator.hasNext()){
iterator.next().remove();
}
}
私有void初始映射(上下文ctx){
}
}
我改为处理程序而不是TimerTask
它起作用了
此处代码:
public class Discover extends Activity{
GoogleMap googleMap;
PendingIntent pendingIntent;
SharedPreferences sharedPreferences;
ArrayList<Marker> marker1 = new ArrayList<Marker>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
removeFriendPosition();
drawFriendPosition();
}
}, 10000);
setContentView(R.layout.activity_discover);
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
initialMap(this.getBaseContext());
drawFriendPosition(this.getBaseContext());
}
private void drawFriendPosition(){
int i = 0;
Cursor c = this.getBaseContext().getContentResolver().query(DataProvider.CONTENT_URI_PROFILE, null, null, null, null);
while(c.moveToNext()){
Marker melbourne = googleMap.addMarker(new MarkerOptions().position( new LatLng(Double.parseDouble(latitude), Double.parseDouble(longitude))));
marker1.add(melbourne);
}
}
private void removeFriendPosition(){
Log.i("Marker's length:", ""+marker1.size());
Iterator<Marker> iterator = marker1.iterator();
while (iterator.hasNext()) {
iterator.next().remove();
}
iterator = marker2.iterator();
while (iterator.hasNext()) {
iterator.next().remove();
}
}
private void initialMap(Context ctx){
}
}
公共类发现扩展活动{
谷歌地图谷歌地图;
下垂的下垂的;
SharedReferences SharedReferences;
ArrayList marker1=新的ArrayList();
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
Handler=newhandler();
handler.postDelayed(新的Runnable(){
@凌驾
public void run(){
removeFriendPosition();
drawFriendPosition();
}
}, 10000);
setContentView(R.layout.activity\u discover);
googleMap=((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
initialMap(this.getBaseContext());
drawFriendPosition(this.getBaseContext());
}
私有void drawFriendPosition(){
int i=0;
游标c=this.getBaseContext().getContentResolver().query(DataProvider.CONTENT\u URI\u PROFILE,null,null,null);
而(c.moveToNext()){
Marker melbourne=googleMap.addMarker(新的MarkerOptions().position(新的LatLng(Double.parseDouble(纬度)、Double.parseDouble(经度)));
marker1.add(墨尔本);
}
}
私有void removeFriendPosition(){
Log.i(“标记的长度:”,“+marker1.size());
迭代器迭代器=marker1.Iterator();
while(iterator.hasNext()){
iterator.next().remove();
}
迭代器=marker2.iterator();
while(iterator.hasNext()){
iterator.next().remove();
}
}
P