android +arcgisserver 属性查询

最新推荐文章于 2022-12-26 15:14:40 发布

转载最新推荐文章于 2022-12-26 15:14:40 发布 · 963 阅读

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本文介绍了一个基于ArcGIS的属性查询示例应用，演示了如何通过输入关键字查询地图上的要素，并使用不同的填充颜色显示查询结果。

public class attrbuteQueryActivity extends Activity {

    Button mQueryButton;
    MapView mMapView;
    final String URL_LAYER = "http://192.168.3.130/ArcGIS/rest/services/China/MapServer";
    GraphicsLayer mGraphicsLayer;
    EditText txtQueryString;

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

        txtQueryString = (EditText) findViewById(R.id.txtQueryString);

        mQueryButton = (Button) findViewById(R.id.queryButton);
        mQueryButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // 查询的关键字
                String keyQuery = txtQueryString.getText().toString();
                Query query = new Query();
                // 类似sql语句的查询 where语句
                query.setWhere("NAME like '%" + keyQuery + "%'");
                query.setReturnGeometry(true);
                // 指定查询的目标图层
                String queryUrl = URL_LAYER + "/0";
                // 构建查询任务对象QueryTask
                QueryTask queryTask = new QueryTask(queryUrl);

                FeatureSet fs = null;//结果集
                try {
                    fs = queryTask.execute(query);//执行查询
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                GraphicsLayer graphicsLayer = GetGraphicLayer();
                String message = "No result comes back";
                if (fs != null && graphicsLayer.isInitialized() && graphicsLayer.isVisible()) {
                    //获得结果集内的 graphics 对象
                    Graphic[] grs = fs.getGraphics();
                    if (grs.length > 0) {
                        //构建  简单填充符号，该对象指定了一种“呈现方式”
                        SimpleFillSymbol symbol = new SimpleFillSymbol(
                                Color.RED);
                        //设定呈现方式
                        graphicsLayer.setRenderer(new SimpleRenderer(symbol));
                        //添加 graphic带图层，这时，会自动用刚刚指定的“呈现方式”来呈现
                        graphicsLayer.removeAll();//移除以前的
                        graphicsLayer.addGraphics(grs);

                        message = (grs.length == 1 ? "1 result has " : Integer
                                .toString(grs.length) + " results have ")
                                + "come back";
                    }

                }
                Toast toast = Toast.makeText(attrbuteQueryActivity.this,
                        message, Toast.LENGTH_LONG);
                toast.show();
            }
        });

        mMapView = (MapView) findViewById(R.id.map);
        // Add layer to MapView
        mMapView.addLayer(new com.esri.android.map.ags.ArcGISDynamicMapServiceLayer(
                URL_LAYER));

        Envelope initextext = new Envelope(12891659.0975195, 4817561.93785559,
                12996377.82627, 4884902.95977474);
        mMapView.setExtent(initextext);
    }

    /*
     * 获得 GetGraphicLayer
     */
    private GraphicsLayer GetGraphicLayer() {
        if (mGraphicsLayer == null) {
            mGraphicsLayer = new GraphicsLayer();
            mMapView.addLayer(mGraphicsLayer);
        }
        return mGraphicsLayer;
    }

}