我想在Google地图上实现自定义模块免费绘图.当涉及到实现时,我发现Google Map onDrag()回调并且总是覆盖我的自定义onDrag()函数.我不太清楚如何使用我的FrameLayout onDrag()覆盖地图点击并拖动动作.
这是我的工作：
XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity" >
<TextView
android:id="@+id/Locinfo"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.example.androidmapsv2.CustomMapFragment" >
</fragment>
<FrameLayout
android:id="@+id/fram_map"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout>
CustomMapFragment.java
package com.example.androidmapsv2;
import com.google.android.gms.maps.MapFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class CustomMapFragment extends MapFragment {
public View mOriginalContentView;
public MapWrapperLayout mMapWrapperLayout;
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup parent,Bundle savedInstanceState) {
mOriginalContentView = super.onCreateView(inflater,parent,savedInstanceState);
mMapWrapperLayout = new MapWrapperLayout(getActivity());
mMapWrapperLayout.addView(mOriginalContentView);
return mMapWrapperLayout;
}
@Override
public View getView() {
return mOriginalContentView;
}
public void setonDragListener(MapWrapperLayout.OnDragListener onDragListener) {
mMapWrapperLayout.setonDragListener(onDragListener);
}
}
MapWrapperLayout.java
public class MapWrapperLayout extends FrameLayout {
private OnDragListener mOnDragListener;
public MapWrapperLayout(Context context) {
super(context);
}
public interface OnDragListener {
public void onDrag(MotionEvent motionEvent);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (mOnDragListener != null) {
mOnDragListener.onDrag(ev);
}
return super.dispatchTouchEvent(ev);
}
public void setonDragListener(OnDragListener mOnDragListener) {
this.mOnDragListener = mOnDragListener;
}
}
MainActivity.java
package com.example.androidmapsv2;
import java.util.ArrayList;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.GoogleMap.OnMarkerClickListener;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.Projection;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.polygon;
import com.google.android.gms.maps.model.polygonoptions;
import com.google.android.gms.maps.model.polylineoptions;
import android.app.Activity;
import android.app.FragmentManager;
import android.graphics.Color;
import android.graphics.Point;
import android.location.Location;
import android.os.Bundle;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity
implements OnMapClickListener {
final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;
Location myLocation;
TextView tvLocinfo;
ArrayList<LatLng> val = new ArrayList<LatLng>();
boolean markerClicked;
polygonoptions polygonoptions;
polygon polygon;
FrameLayout fram_map;
CustomMapFragment myMapFragment ;
boolean Is_MAP_Moveable;
Projection projection;
public double latitude;
public double longitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvLocinfo = (TextView)findViewById(R.id.Locinfo);
FragmentManager myFragmentManager = getFragmentManager();
myMapFragment
= (CustomMapFragment)myFragmentManager.findFragmentById(R.id.map);
if (myMapFragment != null) {
myMapFragment.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap map) {
loadMap(map);
}
});
fram_map = (FrameLayout) findViewById(R.id.fram_map);
Is_MAP_Moveable = false; // to detect map is movable
} else {
Toast.makeText(this,"Error - Map Fragment was null!!",Toast.LENGTH_SHORT).show();
}
}
public void Draw_Map() {
myMap.addpolyline(new polylineoptions()
.addAll(val)
.color(Color.parseColor( "#0971b2")).width(10f));
}
protected void loadMap(GoogleMap map) {
// Todo Auto-generated method stub
myMap = map;
myMap.setMyLocationEnabled(true);
myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
myMap.setonMapClickListener(this);
//myMap.setonMapLongClickListener(this);
//myMap.setonMarkerClickListener(this);
markerClicked = false;
fram_map.setonTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v,MotionEvent event) {
float x = event.getX();
float y = event.getY();
int x_co = Math.round(x);
int y_co = Math.round(y);
projection = myMap.getProjection();
Point x_y_points = new Point(x_co,y_co);
LatLng latLng = myMap.getProjection().fromScreenLocation(x_y_points);
latitude = latLng.latitude;
longitude = latLng.longitude;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// finger touches the screen
val.add(new LatLng(latitude,longitude));
case MotionEvent.ACTION_MOVE:
// finger moves on the screen
val.add(new LatLng(latitude,longitude));
case MotionEvent.ACTION_UP:
v.performClick();
// finger leaves the screen
Draw_Map();
break;
}
if (Is_MAP_Moveable == true) {
return true;
} else {
return false;
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main,menu);
return true;
}
@Override
protected void onResume() {
super.onResume();
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if (resultCode == ConnectionResult.SUCCESS){
Toast.makeText(getApplicationContext(),"isGooglePlayServicesAvailable SUCCESS",Toast.LENGTH_LONG).show();
}else{
GooglePlayServicesUtil.getErrorDialog(resultCode,this,RQS_GooglePlayServices);
}
}
@Override
public void onMapClick(LatLng point) {
Is_MAP_Moveable = !Is_MAP_Moveable;
Toast.makeText(getApplicationContext(),Is_MAP_Moveable ? "drawing activated" : "drawing disabled",Toast.LENGTH_SHORT).show();
// tvLocinfo.setText(point.toString());
// myMap.animateCamera(CameraUpdateFactory.newLatLng(point));
//
// markerClicked = false;
}
// @Override
// public void onMapLongClick(LatLng point) {
// tvLocinfo.setText("New marker added@" + point.toString());
// myMap.addMarker(new MarkerOptions().position(point).title(point.toString()));
//
// markerClicked = false;
// }
//
// @Override
// public boolean onMarkerClick(Marker marker) {
//
// if(markerClicked){
//
// if(polygon != null){
// polygon.remove();
// polygon = null;
// }
//
// polygonoptions.add(marker.getPosition());
// polygonoptions.strokeColor(Color.RED);
// polygonoptions.fillColor(Color.BLUE);
// polygon = myMap.addpolygon(polygonoptions);
// }else{
// if(polygon != null){
// polygon.remove();
// polygon = null;
// }
//
// polygonoptions = new polygonoptions().add(marker.getPosition());
// markerClicked = true;
// }
//
// return true;
// }
}
解决方法
一种方法可以是通过地图创建一个视图,并为此视图创建一个OnTouchListener来拦截地图触摸：
activity_maps.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment" />
<View
android:id="@+id/draggable"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true" />
</RelativeLayout>
MapsActivity.java
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private View draggableView;
private List<LatLng> polylinePoints = new ArrayList<>();
private polyline polyline;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
draggableView = findViewById(R.id.draggable);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
draggableView.setonTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view,MotionEvent motionEvent) {
LatLng position = mMap.getProjection().fromScreenLocation(
new Point((int) motionEvent.getX(),(int) motionEvent.getY()));
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
if (polyline != null) {
polyline.remove();
polyline = null;
}
polyline = mMap.addpolyline(
new polylineoptions().color(Color.RED).addAll(polylinePoints));
} else if (motionEvent.getAction() == MotionEvent.ACTION_MOVE){
polylinePoints.add(position);
polyline.setPoints(polylinePoints);
} else if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
// Close the polyline?
}
return true;
}
});
}
}