4.21WorldWindAndroid空間要素的屬性查詢
阿新 • • 發佈：2018-12-24
問題描述：如何通過點選地圖上的要素彈出相應的屬性顯示框呢？
問題分析：這裡其實涉及到三個問題，第一個問題是如何選中地圖上的要素，第二個問題是如何獲得要素的屬性，第三個問題是如何涉及彈框顯示！
第一個問題，顯然需要有一個方法能夠根據螢幕點選的位置獲取到對應的要素，這個方法在WorldWindAndroid中就是
PickedObjectList pickList = getWorldWindow().pick(event.getX(), event.getY());此外，我們希望在要素被選中時高亮顯示，這一點如何實現呢?
在WorldWindAndroid中的要素類都繼承了Highlightable這個類，只有兩個方法，isHighlighted獲取高亮顯示的狀態，setHighlighted設定高亮顯示的狀態，關鍵還不在這裡，關鍵在要素類是如何利用對高亮狀態的判斷來顯示不同的效果的呢？
public abstract class AbstractShape extends AbstractRenderable implements Attributable, Highlightable {
protected ShapeAttributes attributes;
protected ShapeAttributes highlightAttributes;
protected ShapeAttributes activeAttributes;
protected boolean highlighted;為什麼一個要素，要設定這麼多屬性呢？
attributes是正常顯示的屬性，而highlightAttributes顧名思義就是高亮顯示的屬性了，而activeAttributes就是根據顯示狀態來決定是取attributes呢還是取highlightAttributes，然後通過activeAttributes的設定來繪製要素啦！
@Override
protected void doRender(RenderContext rc) {
// Don't render anything if the shape is not visible.
if (!this.intersectsFrustum(rc)) {
return;
}
// Select the currently active attributes. Don't render anything if the attributes are unspecified.
this.determineActiveAttributes(rc); protected void determineActiveAttributes(RenderContext rc) {
if (this.highlighted && this.highlightAttributes != null) {
this.activeAttributes = this.highlightAttributes;
} else {
this.activeAttributes = this.attributes;
}
}程式碼已經寫得很清楚了，所以，如果希望要素被選中能夠高亮顯示，一定要在建立要素的時候設定上相應的高亮屬性！
第二個問題，如果需要實現這一目標，關鍵在於獲取的要素物件與相應屬性的關聯問題，如果，該要素只是一個圖形物件，而不包含任何與屬性進行關聯的資訊，那麼是無法實現屬性查詢，而要實現關聯的方法有兩種，一種是建立唯一索引，通過索引查詢屬性資料庫，另一種就是在該要素類中直接定義儲存屬性資料的變數，這樣獲取要素的同時就直接可以得到相應的屬性了，顯然第二種方式更為方便，而WorldWindAndroid也充分考慮到了這一點，Path，Polygon都繼承自AbstractShape，AbstractShape，AbstractShape繼承了AbstractRenderable，Placemark則直接繼承了AbstractRenderable，最關鍵的地方來了，AbstractRenderable裡面有兩個重要屬性，一個是要素的顯示名稱displayName，一個是使用者定製屬性uesrProperties
public abstract class AbstractRenderable implements Renderable {
protected String displayName;
protected boolean enabled = true;
protected Object pickDelegate;
protected Map<Object, Object> userProperties;所以，我們在建立要素的時候，只需要將要素的屬性直接寫入這兩個屬性中，就可以在選中要素的時候獲取到要素的屬性資訊了！
當然，如果WorldWind的其他版本中沒有這麼設計，我們可以繼承相應的要素類按照這樣的思路進行拓展即可！
第三個問題，彈框的顯示，這個就比較輕鬆了，直接使用Android的AlertDialog就可以實現了，就不囉嗦了！
測試用例：
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.RadioButton;
import android.widget.TableLayout;
import android.widget.Toast;
import com.R;
import java.util.ArrayList;
import gov.nasa.worldwind.PickedObject;
import gov.nasa.worldwind.PickedObjectList;
import gov.nasa.worldwind.WorldWindow;
import gov.nasa.worldwind.geom.Offset;
import gov.nasa.worldwind.geom.Position;
import gov.nasa.worldwind.globe.BasicElevationCoverage;
import gov.nasa.worldwind.layer.BackgroundLayer;
import gov.nasa.worldwind.layer.BlueMarbleLandsatLayer;
import gov.nasa.worldwind.layer.RenderableLayer;
import gov.nasa.worldwind.render.Color;
import gov.nasa.worldwind.render.ImageSource;
import gov.nasa.worldwind.shape.Path;
import gov.nasa.worldwind.shape.Placemark;
import gov.nasa.worldwind.shape.PlacemarkAttributes;
import gov.nasa.worldwind.shape.Polygon;
import gov.nasa.worldwind.shape.ShapeAttributes;
import gov.nasa.worldwind.shape.TextAttributes;
/**
* Creates a simple view of a globe with touch navigation and a few layers.
*/
public class BasicGlobeActivity extends AppCompatActivity implements GestureDetector.OnGestureListener{
/**
* This protected member allows derived classes to override the resource used in setContentView.
*/
protected int layoutResourceId = R.layout.activity_globe;
//check to draw or not
CheckBox checkDraw ;
//check graphics type
RadioButton checkPoint,checkPolyline,checkPolygon;
//gesture detector
GestureDetectorCompat detectorCompat ;
//basic support
RenderableLayer labelsLayer = new RenderableLayer();
ArrayList<Position> pos = new ArrayList<>();
Position currentPosition;
boolean startDraw =false;
//PlacemarkLayer
RenderableLayer placemarkLayer = new RenderableLayer();
//Polyline
RenderableLayer temPolylineLayer = new RenderableLayer();
RenderableLayer polylineLayer = new RenderableLayer();
// Polygon
RenderableLayer temPolygonLayer = new RenderableLayer();
RenderableLayer polygonLayer = new RenderableLayer();
/**
* The WorldWindow (GLSurfaceView) maintained by this activity
*/
protected WorldWindow wwd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Establish the activity content
setContentView(this.layoutResourceId);
detectorCompat = new GestureDetectorCompat(this,this);
checkDraw = (CheckBox)findViewById(R.id.checkDraw);
checkPoint = (RadioButton)findViewById(R.id.point);
checkPolyline = (RadioButton)findViewById(R.id.polyline);
checkPolygon = (RadioButton)findViewById(R.id.polygon);
checkDraw.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked) {
wwd.setLongClickable(true);
wwd.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return detectorCompat.onTouchEvent(event);
}
});
}else{
wwd.setLongClickable(false);
wwd.setOnTouchListener(null);
}
}
});
// Create the World Window (a GLSurfaceView) which displays the globe.
this.wwd = new WorldWindow(this);
// Override the World Window's built-in navigatior behavior by adding picking support.
this.wwd.setWorldWindowController(new PickObjectController(this));
// Add the WorldWindow view object to the layout that was reserved for the globe.
FrameLayout globeLayout = (FrameLayout) findViewById(R.id.globe);
globeLayout.addView(this.wwd);
// Setup the World Window's layers.
this.wwd.getLayers().addLayer(new BackgroundLayer());
this.wwd.getLayers().addLayer(new BlueMarbleLandsatLayer());
// Setup the World Window's elevation coverages.
this.wwd.getGlobe().getElevationModel().addCoverage(new BasicElevationCoverage());
this.wwd.getLayers().addLayer(placemarkLayer);
this.wwd.getLayers().addLayer(temPolylineLayer);
this.wwd.getLayers().addLayer(polylineLayer);
this.wwd.getLayers().addLayer(temPolygonLayer);
this.wwd.getLayers().addLayer(polygonLayer);
this.wwd.getLayers().addLayer(labelsLayer);
}
@Override
protected void onPause() {
super.onPause();
this.wwd.onPause(); // pauses the rendering thread
}
@Override
protected void onResume() {
super.onResume();
this.wwd.onResume(); // resumes a paused rendering thread
}
public WorldWindow getWorldWindow() {
return this.wwd;
}
@Override
public boolean onDown(MotionEvent e) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
//清空之前的點資料
if(!startDraw) {
pos.clear();
startDraw = true;
}
if (checkPoint.isChecked()) {
currentPosition = this.getCurrentPosition(e);
inputPointAttriDialog();
} else if (checkPolyline.isChecked()) {
currentPosition = this.getCurrentPosition(e);
pos.add(currentPosition);
if (pos.size() > 1) {
ShapeAttributes shapeAttributes = new ShapeAttributes();
shapeAttributes.setDrawVerticals(true); // display the extruded verticals
shapeAttributes.setInteriorColor(new Color(1, 1, 1, 0.5f)); // 50% transparent white
shapeAttributes.setOutlineWidth(3);
temPolylineLayer.clearRenderables();
temPolylineLayer.addRenderable(new Path(pos, shapeAttributes));
wwd.requestRedraw();
}
} else if (checkPolygon.isChecked()) {
currentPosition = this.getCurrentPosition(e);
pos.add(currentPosition);
if (pos.size() > 2) {
ShapeAttributes shapeAttributes = new ShapeAttributes();
shapeAttributes.setDrawVerticals(true); // display the extruded verticals
shapeAttributes.setInteriorColor(new Color(1, 1, 1, 0.5f)); // 50% transparent white
shapeAttributes.setOutlineWidth(3);
temPolygonLayer.clearRenderables();
temPolygonLayer.addRenderable(new Polygon(pos, shapeAttributes));
wwd.requestRedraw();
}
}
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return false;
}
@Override
public void onLongPress(MotionEvent e) {
if(checkPolyline.isChecked()){
currentPosition = this.getCurrentPosition(e);
pos.add(currentPosition);
inputPolylineAttriDialog();
//clear temp layer:清空臨時圖層
temPolylineLayer.clearRenderables();
}else if(checkPolygon.isChecked()){
currentPosition = this.getCurrentPosition(e);
pos.add(currentPosition);
inputPolygonAttriDialog();
//clear temp layer:清空臨時圖層
temPolygonLayer.clearRenderables();
}
//本圖形繪製結束，準備繪製新圖形
startDraw = false;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
return false;
}
public Position getCurrentPosition(MotionEvent event) {
// Forget our last picked object
// Perform a new pick at the screen x, y
PickedObjectList pickList = getWorldWindow().pick(event.getX(), event.getY());
// Get the top-most object for our new picked object
PickedObject top = pickList.topPickedObject();
Position p = null;
if (top != null) {
if (top != null&&top.isTerrain()) {
p = top.getTerrainPosition();
}
}
return p;
}
public void inputPointAttriDialog(){
TableLayout attributeFrom = (TableLayout)getLayoutInflater().inflate(R.layout.feature_attribute,null);
final EditText name = (EditText)attributeFrom.findViewById(R.id.featureName);
final EditText type = (EditText)attributeFrom.findViewById(R.id.featureType);
final EditText desc = (EditText)attributeFrom.findViewById(R.id.featureDesc);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("設定Point屬性")
.setView(attributeFrom)
.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"單擊了［確定］按鈕",Toast.LENGTH_SHORT).show();
//空間及屬性資料存入資料庫
//繪製placemark
ShapeAttributes shapeAttributes = new ShapeAttributes();
shapeAttributes.setDrawVerticals(true); // display the extruded verticals
shapeAttributes.setOutlineColor(new Color(1,0,0,1));
shapeAttributes.setInteriorColor(new Color(1, 0, 0, 0.5f)); // 50% transparent white
shapeAttributes.setOutlineWidth(20);
TextAttributes attrs = new TextAttributes();
attrs.setTextColor(new Color(0, 1, 0, 1)); // green via r,g,b,a
attrs.setTextOffset(Offset.bottomCenter());
attrs.setTypeface(Typeface.DEFAULT); // system default bold typeface
//attrs.setTextSize(30);
Placemark placemark = createPlacemark(currentPosition,name.getText().toString());
placemark.setDisplayName(name.getText().toString());
placemark.putUserProperty("name",name.getText().toString());
placemark.putUserProperty("type",type.getText().toString());
placemark.putUserProperty("desc",desc.getText().toString());
placemarkLayer.addRenderable(placemark);
//繪製labels標識
/* TextAttributes attrs = new TextAttributes();
attrs.setTextColor(new Color(0, 1, 0, 1)); // green via r,g,b,a
attrs.setTextOffset(Offset.bottomCenter());
attrs.setTypeface(Typeface.DEFAULT); // system default bold typeface
//attrs.setTextSize(30); // 48 screen pixels,強制顯示範圍會在字數不夠的情況下發生字型傾斜和重複
labelsLayer.addRenderable(new Label(currentPosition,name.getText().toString(),attrs));*/
wwd.requestRedraw();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"單擊了［取消］按鈕",Toast.LENGTH_SHORT).show();
}
})
.create()
.show();
}
public void inputPolylineAttriDialog(){
TableLayout attributeFrom = (TableLayout)getLayoutInflater().inflate(R.layout.feature_attribute,null);
final EditText name = (EditText)attributeFrom.findViewById(R.id.featureName);
final EditText type = (EditText)attributeFrom.findViewById(R.id.featureType);
final EditText desc = (EditText)attributeFrom.findViewById(R.id.featureDesc);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("設定Polyline屬性")
.setView(attributeFrom)
.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"單擊了［確定］按鈕",Toast.LENGTH_SHORT).show();
//空間及屬性資料存入資料庫
//繪製polyline
Path polyline = createPolyline(pos);
polyline.setDisplayName(name.getText().toString());
polyline.putUserProperty("name",name.getText().toString());
polyline.putUserProperty("type",type.getText().toString());
polyline.putUserProperty("desc",desc.getText().toString());
polylineLayer.addRenderable(polyline);
/* //繪製labels標識
TextAttributes attrs = new TextAttributes();
attrs.setTextColor(new Color(0, 1, 0, 1)); // green via r,g,b,a
attrs.setTextOffset(Offset.bottomCenter());
attrs.setTypeface(Typeface.DEFAULT); // system default bold typeface
//attrs.setTextSize(30); // 48 screen pixels
labelsLayer.addRenderable(new Label(currentPosition,name.getText().toString(),attrs));*/
wwd.requestRedraw();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"單擊了［取消］按鈕",Toast.LENGTH_SHORT).show();
wwd.requestRedraw();
}
})
.create()
.show();
}
public void inputPolygonAttriDialog(){
TableLayout attributeFrom = (TableLayout)getLayoutInflater().inflate(R.layout.feature_attribute,null);
final EditText name = (EditText)attributeFrom.findViewById(R.id.featureName);
final EditText type = (EditText)attributeFrom.findViewById(R.id.featureType);
final EditText desc = (EditText)attributeFrom.findViewById(R.id.featureDesc);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("設定Polygon屬性")
.setView(attributeFrom)
.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"單擊了［確定］按鈕",Toast.LENGTH_SHORT).show();
//空間及屬性資料存入資料庫
//繪製ploygon
Polygon polygon = createPolygon(pos);
polygon.setDisplayName(name.getText().toString());
polygon.putUserProperty("name",name.getText().toString());
polygon.putUserProperty("type",type.getText().toString());
polygon.putUserProperty("desc",desc.getText().toString());
polygonLayer.addRenderable(polygon);
/* //繪製labels標識
TextAttributes attrs = new TextAttributes();
attrs.setTextColor(new Color(0, 1, 0, 1)); // green via r,g,b,a
attrs.setTextOffset(Offset.bottomCenter());
attrs.setTypeface(Typeface.DEFAULT); // system default bold typeface
//attrs.setTextSize(30); // 48 screen pixels
labelsLayer.addRenderable(new Label(currentPosition,name.getText().toString(),attrs));*/
wwd.requestRedraw();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(),"單擊了［取消］按鈕",Toast.LENGTH_SHORT).show();
wwd.requestRedraw();
}
})
.create()
.show();
}
private static Placemark createPlacemark(Position position,String displayName) {
final double NORMAL_IMAGE_SCALE = 3.0;
final double HIGHLIGHTED_IMAGE_SCALE = 4.0;
Placemark placemark =new Placemark(position, PlacemarkAttributes.createWithImage(ImageSource.fromResource(R.drawable.school)),displayName);
placemark.getAttributes().setImageOffset(Offset.bottomCenter()).setImageScale(NORMAL_IMAGE_SCALE).setDrawLeader(true);
placemark.setHighlightAttributes(new PlacemarkAttributes(placemark.getAttributes()).setImageScale(HIGHLIGHTED_IMAGE_SCALE));
return placemark;
}
private static Path createPolyline(ArrayList<Position> position) {
Path polyline = new Path(position);
ShapeAttributes attributes = new ShapeAttributes();
attributes.setDrawVerticals(true); // display the extruded verticals
attributes.setOutlineColor(new Color(1,0,0,1));
attributes.setInteriorColor(new Color(1, 1, 1, 0.5f)); // 50% transparent white
attributes.setOutlineWidth(3);
polyline.setAttributes(attributes);
ShapeAttributes highlightAttributes = new ShapeAttributes();
highlightAttributes.setDrawVerticals(true); // display the extruded verticals
highlightAttributes.setOutlineColor(new Color(0,0,1,1));
highlightAttributes.setInteriorColor(new Color(1, 1, 1, 0.5f)); // 50% transparent white
highlightAttributes.setOutlineWidth(6);
polyline.setHighlightAttributes(highlightAttributes);
return polyline;
}
private static Polygon createPolygon(ArrayList<Position> position) {
Polygon polygon = new Polygon(position);
ShapeAttributes attributes = new ShapeAttributes();
attributes.setDrawVerticals(true); // display the extruded verticals
attributes.setOutlineColor(new Color(1,0,0,1));
attributes.setInteriorColor(new Color(1, 1, 1, 0.5f)); // 50% transparent white
attributes.setOutlineWidth(3);
polygon.setAttributes(attributes);
ShapeAttributes highlightAttributes = new ShapeAttributes();
highlightAttributes.setDrawVerticals(true); // display the extruded verticals
highlightAttributes.setOutlineColor(new Color(0,0,1,1));
highlightAttributes.setInteriorColor(new Color(1, 1, 1, 0.5f)); // 50% transparent white
highlightAttributes.setOutlineWidth(6);
polygon.setHighlightAttributes(highlightAttributes);
return polygon;
}
}
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.ArrayAdapter;
import android.widget.Toast;
import com.R;
import java.util.ArrayList;
import gov.nasa.worldwind.BasicWorldWindowController;
import gov.nasa.worldwind.PickedObject;
import gov.nasa.worldwind.PickedObjectList;
import gov.nasa.worldwind.shape.Highlightable;
import gov.nasa.worldwind.shape.Path;
import gov.nasa.worldwind.shape.Placemark;
import gov.nasa.worldwind.shape.Polygon;
/**
* Created by Lenovo on 2018/4/21.
*/
public class PickObjectController extends BasicWorldWindowController {
protected Object pickedObject; // last picked object from onDown events
protected Object selectedObject; // last "selected" object from single tap
protected Context context;
public PickObjectController(Context context) {
this.context = context;
}
/**
* Assign a subclassed SimpleOnGestureListener to a GestureDetector to handle the "pick" events.
*/
protected GestureDetector pickGestureDetector = new GestureDetector(
context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDown(MotionEvent event) {
pick(event); // Pick the object(s) at the tap location
return false; // By not consuming this event, we allow it to pass on to the navigation gesture handlers
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
toggleSelection(); // Highlight the picked object
// By not consuming this event, we allow the "up" event to pass on to the navigation gestures,
// which is required for proper zoom gestures. Consuming this event will cause the first zoom
// gesture to be ignored. As an alternative, you can implement onSingleTapConfirmed and consume
// event as you would expect, with the trade-off being a slight delay tap response.
return false;
}
});
/**
* Delegates events to the pick handler or the native World Wind navigation handlers.
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
// Allow pick listener to process the event first.
boolean consumed = this.pickGestureDetector.onTouchEvent(event);
// If event was not consumed by the pick operation, pass it on the globe navigation handlers
if (!consumed) {
// The super class performs the pan, tilt, rotate and zoom
return super.onTouchEvent(event);
}
return consumed;
}
/**
* Performs a pick at the tap location.
*/
public void pick(MotionEvent event) {
// Forget our last picked object
this.pickedObject = null;
// Perform a new pick at the screen x, y
PickedObjectList pickList = getWorldWindow().pick(event.getX(), event.getY());
// Get the top-most object for our new picked object
PickedObject topPickedObject = pickList.topPickedObject();
if (topPickedObject != null) {
this.pickedObject = topPickedObject.getUserObject();
}
}
/**
* Toggles the selected state of a picked object.
*/
public void toggleSelection() {
// Display the highlight or normal attributes to indicate the
// selected or unselected state respectively.
if (pickedObject instanceof Highlightable) {
// Determine if we've picked a "new" object so we know to deselect the previous selection
boolean isNewSelection = pickedObject != this.selectedObject;
// Only one object can be selected at time, deselect any previously selected object
if (isNewSelection && this.selectedObject instanceof Highlightable) {
((Highlightable) this.selectedObject).setHighlighted(false);
}
// Show the selection by showing its highlight attributes
((Highlightable) pickedObject).setHighlighted(isNewSelection);
this.getWorldWindow().requestRedraw();
// Track the selected object
this.selectedObject = isNewSelection ? pickedObject : null;
showAttributeDialog();//show attribute if selectObject not null
}
}
public void showAttributeDialog(){
//關鍵問題是如何從pickobject中得到我們設定的要素屬性資料呢？
final ArrayList<String> items = new ArrayList<>();
if(selectedObject!=null){
if(selectedObject instanceof Placemark){
Placemark selectedPlacemark = (Placemark)selectedObject;
String name = selectedPlacemark.getUserProperty("name").toString();
String type = selectedPlacemark.getUserProperty("type").toString();
String desc = selectedPlacemark.getUserProperty("desc").toString();
items.add("名稱："+name);
items.add("型別："+type);
items.add("描述："+desc);
}else if(selectedObject instanceof Path){
Path selectedPolyline = (Path) selectedObject;
String name = selectedPolyline.getUserProperty("name").toString();
String type = selectedPolyline.getUserProperty("type").toString();
String desc = selectedPolyline.getUserProperty("desc").toString();
items.add("名稱："+name);
items.add("型別："+type);
items.add("描述："+desc);
}else if(selectedObject instanceof Polygon){
Polygon selectedPolygon = (Polygon)selectedObject;
String name = selectedPolygon.getUserProperty("name").toString();
String type = selectedPolygon.getUserProperty("type").toString();
String desc = selectedPolygon.getUserProperty("desc").toString();
items.add("名稱："+name);
items.add("型別："+type);
items.add("描述："+desc);
}
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("要素屬性資訊")
.setAdapter(new ArrayAdapter<String>(context, R.layout.array_item, items), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(context,"你選中了《"+items.get(which)+"》",Toast.LENGTH_SHORT).show();
}
})
.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(context,"單擊了［確定］按鈕",Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(context,"單擊了［取消］按鈕",Toast.LENGTH_SHORT).show();
}
})
.create()
.show();
}
}
}專案地址:
https://gitee.com/lq_project/CampusProjectRepository/tree/master/CampusProject/test/src/main/java/com/worldwind/test