我一直在为大学做一个应用程序，它将通过画线（而不是在道路上）显示对象的行为方式，而我仅通过一项活动就做了一个。 我接下来要做的是尝试做同样的事情，但片段化 而且我一直在掠夺战利品，但我仍然真的不知道并不确定如何实现LocalizationButton和onSaveInstanceState以及我选择地图模式的菜单选项。
所以我制作了secound应用程序，其中实现了2个片段，现在我必须实现类似的方法： enableMyLocation onRequestPermissionsResult onSaveInstanceState
还有设置地图模式，我选择地图模式的菜单选项之类的东西
问题是我应该在哪里实施，我应该注意什么或更改？
我所做的代码（现在我必须作为片段来工作）
public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback {
private static final int REQUEST_LOCATION_PERMISSION = 1;
public static final float INITIAL_ZOOM = 10f;
public float current_zoom = NULL;
public LatLng current_target = new LatLng(NULL, NULL);
public float current_bearing = NULL;
public String current_map_mode = "day";
private GoogleMap mMap;
int size=10;
ArrayList<LatLng> points_of_LatLng = new ArrayList<LatLng>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = SupportMapFragment.newInstance();
getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, mapFragment).commit();
mapFragment.getMapAsync(this);
double a;
double b;
for(int x=0;x<size;x++){
Random generator = new Random();
a=(generator.nextDouble()*0.5)+53.425238;
b=(generator.nextDouble()*0.5)+14.5355009;
points_of_LatLng.add(new LatLng(a,b));
Log.i("LatLng_values","Array : "+String.valueOf(points_of_LatLng.get(x)));
}
Log.i("LatLng_values","Array : "+String.valueOf(points_of_LatLng.size()));
if (savedInstanceState != null) {
points_of_LatLng.clear();
points_of_LatLng = savedInstanceState.getParcelableArrayList("savedList");
current_zoom = savedInstanceState.getFloat("savedZoom");
current_target = savedInstanceState.getParcelable("savedTarget") ;
current_bearing = savedInstanceState.getFloat("savedBearing");
current_map_mode = savedInstanceState.getString("savedMapMode");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.map_options, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.normal_map:
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
try {
boolean success = mMap.setMapStyle(
MapStyleOptions.loadRawResourceStyle(this, R.raw.mapy_style_day));
current_map_mode = "day";
if (!success) {
Log.e("Set_map_style", "Style parsing failed.");
}
} catch (Resources.NotFoundException e) {
Log.e("Set_map_style", "Can't find style. Error: ", e);
}
return true;
case R.id.night_mode:
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
try {
boolean success = mMap.setMapStyle(
MapStyleOptions.loadRawResourceStyle(this, R.raw.map_style_night));
current_map_mode = "night";
if (!success) {
Log.e("Set_map_style", "Style parsing failed.");
}
} catch (Resources.NotFoundException e) {
Log.e("Set_map_style", "Can't find style. Error: ", e);
}
return true;
case R.id.satellite_map:
mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
current_map_mode = "satellite";
return true;
case R.id.terrain_map:
mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
current_map_mode = "terrain";
return true;
case R.id.info:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng myStartLocation = new LatLng(53.425238, 14.5355009);
if(current_zoom==NULL ){
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(myStartLocation, INITIAL_ZOOM));
}
else{
mMap.moveCamera(CameraUpdateFactory.newCameraPosition(new CameraPosition.Builder()
.target(current_target)
.zoom(current_zoom)
.bearing(current_bearing)
.build()));
}
enableMyLocation(mMap);
mMap.setOnMyLocationButtonClickListener(new GoogleMap.OnMyLocationButtonClickListener(){
@Override
public boolean onMyLocationButtonClick()
{
if(isLocationEnabled(getApplicationContext())) {
}
else{
Toast toast = Toast.makeText(getApplicationContext(), "Włącz lokalizacje.", Toast.LENGTH_LONG);
toast.show();
}
return false;
}
});
drawn_line(this.points_of_LatLng,this.mMap);
if (current_zoom!=NULL) switch (current_map_mode) {
case "day":
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
try {
boolean success = mMap.setMapStyle(
MapStyleOptions.loadRawResourceStyle(this, R.raw.mapy_style_day));
if (!success) {
Log.e("Set_map_style", "Style parsing failed.");
}
} catch (Resources.NotFoundException e) {
Log.e("Set_map_style", "Can't find style. Error: ", e);
}
break;
case "night":
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
try {
boolean success = mMap.setMapStyle(MapStyleOptions.loadRawResourceStyle(this, R.raw.map_style_night));
if (!success) {
Log.e("Set_map_style", "Style parsing failed.");
}
} catch (Resources.NotFoundException e) {
Log.e("Set_map_style", "Can't find style. Error: ", e);
}
break;
case "satellite":
mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
break;
case "terrain":
mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
break;
default:
break;
}
}
/**
* Sprawdza czy jest pozwolenie na lokację
*/
private void enableMyLocation(GoogleMap map) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) { map.setMyLocationEnabled(true);
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION_PERMISSION);
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
@NonNull String[] permissions,
@NonNull int[] grantResults) {
switch (requestCode) {
case REQUEST_LOCATION_PERMISSION:
if (grantResults.length > 0
&& grantResults[0]
== PackageManager.PERMISSION_GRANTED) { enableMyLocation(mMap);
break;
}
}
}
public static boolean isLocationEnabled(Context context) {
int locationMode = 0;
String locationProviders;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){
try {
locationMode = Settings.Secure.getInt(context.getContentResolver(), Settings.Secure.LOCATION_MODE);
} catch (Settings.SettingNotFoundException e) {
e.printStackTrace();
return false;
}
return locationMode != Settings.Secure.LOCATION_MODE_OFF;
}else{
locationProviders = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
return !TextUtils.isEmpty(locationProviders);
}
}
public void drawn_line(List<LatLng> tab , GoogleMap googleMap){
for(int i=1;i<tab.size();i++){
LatLng a = tab.get(i-1);
LatLng b = tab.get(i);
Polyline polyline = googleMap.addPolyline(new PolylineOptions()
.clickable(true)
.add(
a,
b
));
polyline.setColor(Color.RED);
if(i==tab.size()-1){
LatLng last_baloon_location = tab.get(i);
mMap.addMarker(new MarkerOptions()
.position(last_baloon_location)
.title("Ostatnie znane polożenie")
.icon(BitmapDescriptorFactory.defaultMarker
(BitmapDescriptorFactory.HUE_ROSE)));
}
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putParcelableArrayList("savedList", points_of_LatLng);
outState.putFloat("savedZoom",mMap.getCameraPosition().zoom);
outState.putParcelable("savedTarget",mMap.getCameraPosition().target);
outState.putFloat("savedBearing",mMap.getCameraPosition().bearing);
outState.putString("savedMapMode",current_map_mode);
super.onSaveInstanceState(outState);
}
}
应用我必须添加这些方法
我的片段代码map_fragment.xml
package com.example.android.madbaloon3;
public class MapFragment extends Fragment implements OnMapReadyCallback {
private static final int REQUEST_LOCATION_PERMISSION = 1;
public static final float INITIAL_ZOOM = 10f;
public float current_zoom = NULL;
public LatLng current_target = new LatLng(NULL, NULL);
public float current_bearing = NULL;
public String current_map_mode = "day";
private GoogleMap mMap;
int size=10;
ArrayList<LatLng> points_of_LatLng = new ArrayList<LatLng>();
public MapFragment() {
// Required empty public constructor
}
SupportMapFragment mapFragment;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_map, container, false);
mapFragment = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map);
if(mapFragment==null){
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
mapFragment = SupportMapFragment.newInstance();
ft.replace(R.id.map,mapFragment).commit();
}
mapFragment.getMapAsync(this);
return v;
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Ustawia mapę w danym punkcie
LatLng myStartLocation = new LatLng(53.425238, 14.5355009);
if(current_zoom==NULL ){
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(myStartLocation, INITIAL_ZOOM));
}
else{
mMap.moveCamera(CameraUpdateFactory.newCameraPosition(new CameraPosition.Builder()
.target(current_target)
.zoom(current_zoom)
.bearing(current_bearing)
.build()));
}
}
}
conntent_main.xml的布局
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="@layout/app_bar_main">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:layout_editor_absoluteY="0dp">
<fragment
android:id="@+id/Mapfragment"
android:name="com.example.android.madbaloon3.MapFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="25"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout="@layout/fragment_map" />
<fragment
android:id="@+id/Datafragment"
android:name="com.example.android.madbaloon3.DataFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout="@layout/fragment_data" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
map_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MapsActivity" >
<FrameLayout
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MapsActivity" />
</FrameLayout>