10
我想實現一個在Google Map上自由繪圖的自定義模塊。談到實施時，我發現谷歌地圖onDrag()回調，並總是覆蓋我的自定義onDrag()函數。我不太確定如何使用我的FrameLayoutonDrag()覆蓋地圖點擊和拖動動作。在Google地圖上通過手指自由地繪圖
這是我的工作：
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 [email protected]" + 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;
// }
}