我正在开发一个使用 Google Maps Android API 的 Android 应用程序，但在从地图中清除折线时遇到问题。我已经在对话框中实现了多段线的添加，并且我想在按下“清除”按钮时删除当前显示的多段线。但是，折线并未按预期被删除。
问题描述：
当选择特定路线时，我有一个对话框显示带有折线的 Google 地图。以下是代码结构的概述：
我在地图上创建并显示一个包含所选路线折线的对话框。 我在对话框中有一个“清除”按钮（clearRouteBtn），它应该从地图中删除显示的折线。 我正在使用的折线
问题：
问题是，当我单击“清除”按钮时，即使我使用 PolylineView.remove();，它也不会从地图中删除折线。日志消息表明折线已被删除，但它在地图上仍然可见。
我尝试过的：
我尝试添加日志消息来验证 PolylineView 不为空。 我还确保按钮的单击侦听器已正确设置。 预期行为：
当我单击“清除”按钮时，我希望当前显示的折线从地图中删除。
实际行为：
单击“清除”按钮时，折线不会从地图上删除。
附加信息：
该应用程序使用 Google 地图 Android API。 使用 PolylineView = mMap.addPolyline(polylineOptions); 添加折线。 “清除”按钮的可见性最初设置为 INVISIBLE
任何有关如何解决此问题的建议或见解将不胜感激。
public Polyline currentPolyline;
public Polyline PolylineView;
这是第二条折线和我的清除按钮所在的位置
Button buttonOkay = dialogView.findViewById(R.id.button);
buttonOkay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
for (AlertDialog openDialog : openDialogs) {
if ("RouteForBalibagoHighway".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForBalibagoHighway
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForBalibagoHighway)
.width(8)
.color(jeep_grey);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
} else if ("RouteForBalibagoHolyHighway".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForBalibagoHolyHighway
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForBalibagoHolyHighway)
.width(8)
.color(jeep_purple);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
} else if ("RouteForVillaPampang".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForVillaPampang)
.width(8)
.color(jeep_yellow);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
} else if ("RouteForSapangBato".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForSapangBato)
.width(8)
.color(Color.RED);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
}else if ("RouteForPandan".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForPandan)
.width(8)
.color(Color.BLUE);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
}else if ("RouteForMaingate".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForMaingate)
.width(8)
.color(jeep_brown);
PolylineView = mMap.addPolyline(polylineOptions);
}else if ("RouteForSunset".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForSunset)
.width(8)
.color(jeep_orange);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
}else if ("RouteForHenson".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForHenson)
.width(8)
.color(jeep_white);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
}else if ("RouteForMarisolPampang".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForMarisolPampang)
.width(8)
.color(Color.GREEN);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
}else if ("RouteForCapaya".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForCapaya)
.width(8)
.color(jeep_pink);
PolylineView = mMap.addPolyline(polylineOptions);
Log.d("Debug", "PolylineView: " + PolylineView);
}
// THIS IS WHERE I PUT MY CLEAR BUTTON
clearRouteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (PolylineView != null) {
PolylineView.remove();
Log.d("Debug", "Removed: " + PolylineView);
} else {
// Handle the case where the polyline couldn't be added
}
}
});
// After adding the polyline, make the clear button visible
clearRouteBtn.setVisibility(View.VISIBLE);
discountApplied = false; // Mark the discount as applied
openDialog.dismiss();
}
}
});
} else {
Log.e(TAG, "No layout resource found for custom route: " + customRouteLabel);
}
}
“我通过为折线添加 ArrayList 解决了这个问题。这允许我将每条新添加的线存储在 ArrayList 中，并且在清除线后将 PolylineView 设置为 null。我还将 for 循环外部的清除按钮移至防止意外行为。”
List<Polyline> polylines = new ArrayList<>();
Button buttonOkay = dialogView.findViewById(R.id.button);
buttonOkay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
for (AlertDialog openDialog : openDialogs) {
Polyline PolylineView = null;
if ("RouteForBalibagoHighway".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForBalibagoHighway
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForBalibagoHighway)
.width(8)
.color(jeep_grey);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
} else if ("RouteForBalibagoHolyHighway".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForBalibagoHolyHighway
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForBalibagoHolyHighway)
.width(8)
.color(jeep_purple);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
Log.d("Debug", "PolylineView: " + PolylineView);
} else if ("RouteForVillaPampang".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForVillaPampang)
.width(8)
.color(jeep_yellow);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
Log.d("Debug", "PolylineView: " + PolylineView);
} else if ("RouteForSapangBato".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForSapangBato)
.width(8)
.color(Color.RED);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
Log.d("Debug", "PolylineView: " + PolylineView);
}else if ("RouteForPandan".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForPandan)
.width(8)
.color(Color.BLUE);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
Log.d("Debug", "PolylineView: " + PolylineView);
}else if ("RouteForMaingate".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForMaingate)
.width(8)
.color(jeep_brown);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
}else if ("RouteForSunset".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForSunset)
.width(8)
.color(jeep_orange);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
}else if ("RouteForHenson".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForHenson)
.width(8)
.color(jeep_white);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
}else if ("RouteForMarisolPampang".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForMarisolPampang)
.width(8)
.color(Color.GREEN);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
}else if ("RouteForCapaya".equals(customRouteLabel)) {
// Handle "Okay" button click for RouteForVillaPampang
PolylineOptions polylineOptions = new PolylineOptions()
.addAll(customRouteForCapaya)
.width(8)
.color(jeep_pink);
PolylineView = mMap.addPolyline(polylineOptions);
if (PolylineView != null) {
polylines.add(PolylineView);
Log.d("Debug", "PolylineView: " + PolylineView);
}
}
// After adding the polyline, make the clear button visible
clearRouteBtn.setVisibility(View.VISIBLE);
discountApplied = false; // Mark the discount as applied
openDialog.dismiss();
}