我的主要活动中有一个地图片段，在我的onMapReady上我添加了300个标记。标记分为5个类别，每个类别保存在List category1（2,3,4,5）= new ArrayList中。我有一个按钮，可以根据警报对话框中的用户选项将标记设置为可见，按类别过滤标记。
for (Marker marker : category1) {
marker.setVisible(true);.....
在屏幕配置发生变化之前，一切都正常。 我发现在旋转时保持可见标记的一个解决方案是添加我的onCreate
if (savedInstanceState == null) {
mapFragment.setRetainInstance(true);}
这适用于保持当前选择但是当我尝试再次过滤时没有任何更改。映射片段的状态保留在配置更改之前我过滤的标记。
另一方面，如果我没有使用mapFragment.setRetainInstance（true）;每次配置更改时，所有标记再次添加到片段上，过滤再次起作用，但我必须每次重新过滤。
如何添加所有标记一次，然后根据类别过滤器隐藏/显示它们，在屏幕旋转之间保持可见的标记并从它们的最后状态开始再次过滤它们？
更新
这是我所拥有的（我试图只添加相关代码）
Boolean mSetCameraPosition;
Boolean initialMarkers;
Boolean checkBox1Checked, checkBox2Checked, checkBox3Checked, checkBox4Checked, checkBox5Checked;
private int mapTypeSelected;
CheckBox cbAllDay, cbBefore12, cbBetween1216, cbBetween1620, ccbAfter20;
AlertDialog dialog;
List<Marker> firstCategoryList = new ArrayList<>();
List<Marker> secondCategoryList = new ArrayList<>();
List<Marker> thirdCategoryList = new ArrayList<>();
List<Marker> fourthCategoryList = new ArrayList<>();
List<Marker> fifthCategoryList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkLocationPermission();
}
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
if (savedInstanceState == null) {
mapTypeSelected = GoogleMap.MAP_TYPE_NORMAL;
mSetCameraPosition = true;
mapFragment.setRetainInstance(true);
initialMarkers = true;
} else {
mapTypeSelected = savedInstanceState.getInt("the_map_type", GoogleMap.MAP_TYPE_NORMAL);
mSetCameraPosition = false;
initialMarkers = false;
checkBox1Checked = savedInstanceState.getBoolean("checkBox1");
checkBox2Checked = savedInstanceState.getBoolean("checkBox2");
checkBox3Checked = savedInstanceState.getBoolean("checkBox3");
checkBox4Checked = savedInstanceState.getBoolean("checkBox4");
checkBox5Checked = savedInstanceState.getBoolean("checkBox5");
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (mSetCameraPosition) {
initialLocation(TOULOUSE_LAT, TOULOUSE_LNG, 12);
}
mMap.setMapType(mapTypeSelected);
if (initialMarkers) {
addMarkers2Map();
}
public void addMarkers2Map() {
// Markers location
LatLng marker1 = new LatLng(43.607044, 1.450307);
LatLng marker2= new LatLng(43.571505, 1.417759);
LatLng marker3= new LatLng(43.607469, 1.447162);
LatLng marker4= new LatLng(43.600723, 1.455917);
LatLng marker5= new LatLng(43.604892, 1.476562);
LatLng marker6= new LatLng(43.604496, 1.474924);
LatLng marker7= new LatLng(43.604781, 1.474502);
// Markers All day long
firstCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker1).title("First Place ").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 8.30 - 22.30")));
// Markers Before 12 PM
secondCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker2).title("Second Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 10.30 - 11.30")));
// Markers Between 12-16
thirdCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker3).title("Third Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 15.30 - 16.30")));
thirdCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker4).title("Fourth Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 15.00 - 16.00")));
// Markers Between 16-20
fourthCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker5).title("Fifth Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 15.30 - 16.30")));
fourthCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker6).title("Sixth Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 16.30 - 17.30")));
fourthCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker7).title("Seventh Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 18.30 - 19.30")));
fourthCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker8).title("Eighth Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 17.30 - 18.30\nHH:21.30 - 22.30")));
// Markers After 20
fifthCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker8).title("Eighth Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 17.30 - 18.30\nHH:21.30 - 22.30")));
fifthCategoryList.add(mMap.addMarker(new MarkerOptions().position(marker1).title("First Place").icon(BitmapDescriptorFactory.fromResource(R.drawable.beer_marker)).snippet("HH: 8.30 - 22.30")));
public void filterTheMarkers(View view) {
if (dialog == null){
AlertDialog.Builder builder;
builder = new AlertDialog.Builder(this);
LayoutInflater inflater = this.getLayoutInflater();
@SuppressLint("InflateParams") View checkBoxView = inflater.inflate(R.layout.markers_filtering, null);
builder.setView(checkBoxView);
cbAllDay = (CheckBox) checkBoxView.findViewById(R.id.checkBox1);
if (checkBox1Checked != null) {
cbAllDay.setChecked(checkBox1Checked);
}
cbBefore12 = (CheckBox) checkBoxView.findViewById(R.id.checkBox2);
if (checkBox2Checked != null) {
cbBefore12.setChecked(checkBox2Checked);
}
cbBetween1216 = (CheckBox) checkBoxView.findViewById(R.id.checkBox3);
if (checkBox3Checked != null) {
cbBetween1216.setChecked(checkBox3Checked);
}
cbBetween1620 = (CheckBox) checkBoxView.findViewById(R.id.checkBox4);
if (checkBox4Checked != null) {
cbBetween1620.setChecked(checkBox4Checked);
}
ccbAfter20 = (CheckBox) checkBoxView.findViewById(R.id.checkBox5);
if (checkBox5Checked != null) {
ccbAfter20.setChecked(checkBox5Checked);
}
dialog = builder.create();
}
dialog.show();
}
public void displaySelectedMarkers(View view) {
dialog.dismiss();
Log.i("TAG", "All Day " + cbAllDay.isChecked() + " Before 12 " + cbBefore12.isChecked() + " Between 12-16 " + cbBetween1216.isChecked() + " Between 16-20" + cbBetween1620.isChecked() + " After 20 " + ccbAfter20.isChecked());
//according these check boxes status execute your code to show/hide markers
if (cbAllDay.isChecked() && cbBefore12.isChecked() && cbBetween1216.isChecked() && cbBetween1620.isChecked() && ccbAfter20.isChecked()) {
// show all markers
for (Marker marker : firstCategoryList) {
marker.setVisible(true);
}
for (Marker marker : secondCategoryList) {
marker.setVisible(true);
}
for (Marker marker : thirdCategoryList) {
marker.setVisible(true);
}
for (Marker marker : fourthCategoryList) {
marker.setVisible(true);
}
for (Marker marker : fifthCategoryList) {
marker.setVisible(true);
}
} else if (cbAllDay.isChecked() && !cbBefore12.isChecked() && !cbBetween1216.isChecked() && !cbBetween1620.isChecked() && !ccbAfter20.isChecked()) {
// show only All Day Markers
for (Marker marker : firstCategoryList) {
marker.setVisible(true);
}
for (Marker marker : secondCategoryList) {
marker.setVisible(false);
}
for (Marker marker : thirdCategoryList) {
marker.setVisible(false);
}
for (Marker marker : fourthCategoryList) {
marker.setVisible(false);
}
for (Marker marker : fifthCategoryList) {
marker.setVisible(false);
}
}
//....and it goes like this for a while until I finish all the possibilities
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("the_map_type", mapTypeSelected);
outState.putBoolean("checkBox1", cbAllDay.isChecked());
outState.putBoolean("checkBox2", cbBefore12.isChecked());
outState.putBoolean("checkBox3", cbBetween1216.isChecked());
outState.putBoolean("checkBox4", cbBetween1620.isChecked());
outState.putBoolean("checkBox5", ccbAfter20.isChecked());
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
savedInstanceState.get("the_map_type");
checkBox1Checked = savedInstanceState.getBoolean("checkBox1");
checkBox2Checked = savedInstanceState.getBoolean("checkBox2");
checkBox3Checked = savedInstanceState.getBoolean("checkBox3");
checkBox4Checked = savedInstanceState.getBoolean("checkBox4");
checkBox5Checked = savedInstanceState.getBoolean("checkBox5");
答案 0 :(得分：3)
您可以在清单中自行处理方向更改：
<activity android:name=".MyActivity"
android:configChanges="orientation|screenSize"
android:label="@string/app_name">
这样，当方向或屏幕尺寸发生变化时，不会重新创建Activity。如果您有横向/纵向覆盖，则必须处理布局切换等事情。
答案 1 :(得分：0)
似乎在保存地图的片段上调用setRetainInstance(true);可以通过方向更改等保留地图上的所有内容，而不必担心保存和恢复状态。