Question

arcgis for andorid怎么制作缓冲区buffer

Answer 1

package com.esrichina.android;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import com.esri.android.map.GraphicsLayer;
import com.esri.android.map.MapView;
import com.esri.core.symbol.MarkerSymbol;
import com.esri.core.symbol.SimpleMarkerSymbol;
import com.esrichina.android.ext.drawtool.DrawEvent;
import com.esrichina.android.ext.drawtool.DrawEventListener;
import com.esrichina.android.ext.drawtool.DrawTool;
import com.esrichina.demo.geocoding.R;

/**
*
* @author ropp gispace@yeah.net
*
* 由于要响应DrawTool的画图事件，此处需要实现DrawEventListener接口
*/
public class DrawToolActivity extends Activity implements DrawEventListener{

private MapView mapView;
private GraphicsLayer drawLayer;
private DrawTool drawTool;

private MarkerSymbol markerSymbol;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

this.mapView = (MapView)this.findViewById(R.id.map);
this.drawLayer = new GraphicsLayer(this.mapView.getContext());
this.mapView.addLayer(this.drawLayer);
// 初始化DrawTool实例
this.drawTool = new DrawTool(this.mapView);
// 将本Activity设置为DrawTool实例的Listener
this.drawTool.addEventListener(this);

// 此处可以根据需要设置DrawTool实例画图时使用的各种symbol
this.markerSymbol = new SimpleMarkerSymbol(Color.RED, 20, SimpleMarkerSymbol.STYLE.CIRCLE);
//this.drawTool.setMarkerSymbol(markerSymbol);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = this.getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.point:
drawTool.activate(DrawTool.POINT);
break;
case R.id.envelope:
drawTool.activate(DrawTool.ENVELOPE);
break;
case R.id.polygon:
drawTool.activate(DrawTool.POLYGON);
break;
case R.id.polyline:
drawTool.activate(DrawTool.POLYLINE);
break;
case R.id.freehandpolygon:
drawTool.activate(DrawTool.FREEHAND_POLYGON);
break;
case R.id.freehandpolyline:
drawTool.activate(DrawTool.FREEHAND_POLYLINE);
break;
case R.id.circle:
drawTool.activate(DrawTool.CIRCLE);
break;
case R.id.clear:
this.drawLayer.clear();
this.drawLayer.postInvalidate();
this.drawTool.deactivate();
break;
}
return true;
}

// 实现DrawEventListener中定义的方法
public void handleDrawEvent(DrawEvent event) {
// 将画好的图形（已经实例化了Graphic），添加到drawLayer中并刷新显示
this.drawLayer.addGraphic(event.getDrawGraphic());
this.drawLayer.postInvalidate();
}
}