Android 确认对话框后如何将数据从类传递到活动?(在mapview上绘制)
我有一个扩展的覆盖类: 短代码:Android 确认对话框后如何将数据从类传递到活动?(在mapview上绘制),android,google-maps,android-mapview,Android,Google Maps,Android Mapview,我有一个扩展的覆盖类: 短代码: public class MapOverlay extends Overlay { private Context context; private ProgressDialog dDialog; Drawable drawable; GeoPoint MainPoint; MapView mapView; public MapOverlay(Context context, MapView mapView) { this.context = c
public class MapOverlay extends Overlay {
private Context context;
private ProgressDialog dDialog;
Drawable drawable;
GeoPoint MainPoint;
MapView mapView;
public MapOverlay(Context context, MapView mapView)
{
this.context = context;
this.mapView = mapView;
}
@Override
public boolean onTap(GeoPoint p, MapView mapView)
{
this.MainPoint = p;
AlertDialog.Builder dialog = new AlertDialog.Builder(context);
dialog.setMessage("Do you want to set point here?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
setPoint();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
dialog.show();
return true;
}
public void setPoint()
{
OverlayItem overlayitem = new OverlayItem(MainPoint, "Hi!", "You touched this location!");
}
我想在我的mapview上绘制接触点,这是在本活动中:
public class MyMapLocationActivity extends MapActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
drawable = this.getResources().getDrawable(R.drawable.androidmarker);
MapOverlay myOverlay = new MapOverlay(this, mapView);
mapView.getOverlays().add(myOverlay);
mapView.postInvalidate();
}
在确认MapOverlay类中的对话框后,我想标记接触点。我想我错过了传递一些东西-我还应该做什么呢?您需要一个扩展ItemizeOverlay的类,它反过来可以保存覆盖项,该覆盖项在其构造函数中接受一个地质点。差不多
public class MapDemo extends MapActivity implements OnTouchListener {
private Drawable mDrawable;
private ItemizedMapOverlay mItemizedOverlay;
private OverlayItem mOverlayitem;
private GeoPoint mClickedPoint = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GeoPoint mapCentrePoint = new GeoPoint(51500000, 0);
MapView mapView = (MapView) findViewById(R.id.mapview);
mapView.setOnTouchListener(this);
MapController mapCtrlr = mapView.getController();
mapView.setBuiltInZoomControls(true);
mapCtrlr.setZoom(8);
mapCtrlr.setCenter(mapCentrePoint);
List<Overlay> mapOverlays = mapView.getOverlays();
mDrawable = this.getResources().getDrawable(R.drawable.icon);
mItemizedOverlay = new ItemizedMapOverlay(mDrawable, this);
mapOverlays.add(mItemizedOverlay);
}
@Override
protected boolean isRouteDisplayed() {return false;}
@Override
public boolean onTouch(View v, MotionEvent e) {
if (e.getAction() == MotionEvent.ACTION_DOWN) {
final View fv = v;
AlertDialog.Builder dialog = new AlertDialog.Builder(v
.getRootView().getContext());
dialog.setMessage("Do you want to set point here?")
.setCancelable(false)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
setPoint(fv);
}
})
.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
dialog.cancel();
}
});
dialog.show();
// Can't show point till +ve button selected, so store it
mClickedPoint = ((MapView) v).getProjection()
.fromPixels((int)e.getX(), (int)e.getY());
}
return true;
}
void setPoint(View v) {
if (mClickedPoint != null) {
mOverlayitem = new OverlayItem(mClickedPoint, "test", "test2");
mOverlayitem.setMarker(mDrawable);
mItemizedOverlay.clear(); // clear last marker
mItemizedOverlay.addOverlay(mOverlayitem);
v.postInvalidate();
}
}
}
公共类MapDemo扩展了MapActivity实现OnTouchListener{
私人可提取;
私有项目化覆盖层斜接覆盖层;
专用OverlayItem mOverlayitem;
专用地质点mClickedPoint=null;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
地质点地图中心点=新的地质点(51500000,0);
MapView MapView=(MapView)findViewById(R.id.MapView);
setOnTouchListener(这个);
MapController mapCtrlr=mapView.getController();
mapView.SetBuilTinZoomControl(真);
mapCtrlr.setZoom(8);
mapCtrlr.setCenter(mapCentrePoint);
List mapOverlays=mapView.getOverlays();
mDrawable=this.getResources().getDrawable(R.drawable.icon);
mItemizedOverlay=新的ItemizedMapOverlay(mDrawable,this);
地图覆盖。添加(斜接覆盖);
}
@凌驾
受保护的布尔值isRouteDisplayed(){return false;}
@凌驾
公共布尔onTouch(视图v,运动事件e){
如果(e.getAction()==MotionEvent.ACTION\u DOWN){
最终视图fv=v;
AlertDialog.Builder dialog=新建AlertDialog.Builder(v
.getRootView().getContext());
setMessage(“是否要在此处设置点?”)
.setCancelable(错误)
.setPositiveButton(“是”,
新建DialogInterface.OnClickListener(){
公共void onClick(对话框接口对话框,
int id){
设定值(fv);
}
})
.setNegativeButton(“否”,
新建DialogInterface.OnClickListener(){
公共void onClick(对话框接口对话框,
int id){
dialog.cancel();
}
});
dialog.show();
//在选择+ve按钮之前无法显示点,因此请将其存储
mClickedPoint=((MapView)v).getProjection()
.fromPixels((int)e.getX(),(int)e.getY());
}
返回true;
}
无效设定点(视图v){
如果(mClickedPoint!=null){
mOverlayitem=新的覆盖项(mClickedPoint,“测试”,“测试2”);
mOverlayitem.setMarker(可绘制);
MitemizeOverlay.clear();//清除最后一个标记
斜接覆盖。添加覆盖(mOverlayitem);
v、 后验证();
}
}
}
及
public类itemizedmaoverlay扩展了ItemizedOverlay{
private ArrayList mOverlays=new ArrayList();
public ItemizedMapOverlay(可绘制默认标记){
super(boundCenterBottom(defaultMarker));
}
public ItemizedMapOverlay(可绘制的默认标记,上下文){
super(boundCenterBottom(defaultMarker));
}
@凌驾
受保护的OverlayItem createItem(inti){return mOverlays.get(i);}
@凌驾
public void draw(android.graphics.Canvas画布、MapView MapView、,
布尔阴影){
super.draw(画布、地图视图、阴影);
}
@凌驾
public int size(){return mOverlays.size();}
公共void addOverlay(OverlayItem overlay){
添加(覆盖);
填充();
}
公共空间清除(){
mOverlays.clear();
}
}
应该足够近,以便您进行调整。您需要有一个扩展ItemizeOverlay的类,该类反过来可以保存覆盖项,该覆盖项在其构造函数中采用一个地质点。差不多
public class MapDemo extends MapActivity implements OnTouchListener {
private Drawable mDrawable;
private ItemizedMapOverlay mItemizedOverlay;
private OverlayItem mOverlayitem;
private GeoPoint mClickedPoint = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GeoPoint mapCentrePoint = new GeoPoint(51500000, 0);
MapView mapView = (MapView) findViewById(R.id.mapview);
mapView.setOnTouchListener(this);
MapController mapCtrlr = mapView.getController();
mapView.setBuiltInZoomControls(true);
mapCtrlr.setZoom(8);
mapCtrlr.setCenter(mapCentrePoint);
List<Overlay> mapOverlays = mapView.getOverlays();
mDrawable = this.getResources().getDrawable(R.drawable.icon);
mItemizedOverlay = new ItemizedMapOverlay(mDrawable, this);
mapOverlays.add(mItemizedOverlay);
}
@Override
protected boolean isRouteDisplayed() {return false;}
@Override
public boolean onTouch(View v, MotionEvent e) {
if (e.getAction() == MotionEvent.ACTION_DOWN) {
final View fv = v;
AlertDialog.Builder dialog = new AlertDialog.Builder(v
.getRootView().getContext());
dialog.setMessage("Do you want to set point here?")
.setCancelable(false)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
setPoint(fv);
}
})
.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
dialog.cancel();
}
});
dialog.show();
// Can't show point till +ve button selected, so store it
mClickedPoint = ((MapView) v).getProjection()
.fromPixels((int)e.getX(), (int)e.getY());
}
return true;
}
void setPoint(View v) {
if (mClickedPoint != null) {
mOverlayitem = new OverlayItem(mClickedPoint, "test", "test2");
mOverlayitem.setMarker(mDrawable);
mItemizedOverlay.clear(); // clear last marker
mItemizedOverlay.addOverlay(mOverlayitem);
v.postInvalidate();
}
}
}
公共类MapDemo扩展了MapActivity实现OnTouchListener{
私人可提取;
私有项目化覆盖层斜接覆盖层;
专用OverlayItem mOverlayitem;
专用地质点mClickedPoint=null;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
地质点地图中心点=新的地质点(51500000,0);
MapView MapView=(MapView)findViewById(R.id.MapView);
setOnTouchListener(这个);
MapController mapCtrlr=mapView.getController();
mapView.SetBuilTinZoomControl(真);
mapCtrlr.setZoom(8);
mapCtrlr.setCenter(mapCentrePoint);
List mapOverlays=mapView.getOverlays();
mDrawable=this.getResources().getDrawable(R.drawable.icon);
mItemizedOverlay=新的ItemizedMapOverlay(mDrawable,this);
地图覆盖。添加(斜接覆盖);
}
@凌驾
受保护的布尔值isRouteDisplayed(){return false;}
@凌驾
公共布尔onTouch(视图v,运动事件e){
如果(e.getAction()==MotionEvent.ACTION\u DOWN){
最终视图fv=v;
AlertDialog.Builder dialog=新建AlertDialog.Builder(v
.getRootView().getContext());
setMessage(“是否要在此处设置点?”)
.setCancelable(错误)
.setPositiveButton(“是”,
新建DialogInterface.OnClickListener(){
公共void onClick(对话框接口对话框,