ArcGIS Runtime SDK for Android 100 加载指定文件夹下的shp数据

最新推荐文章于 2022-05-24 18:42:30 发布

gislaozhang

最新推荐文章于 2022-05-24 18:42:30 发布

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分类专栏： Runtime for Android

本文链接：https://blog.youkuaiyun.com/gislaozhang/article/details/114871322

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本文介绍如何在Android设备上使用ArcGIS Runtime SDK for Android 100.10从指定的本地文件夹加载shp矢量文件，并展示了完整的实现代码。通过请求读取外部存储权限，确保可以在移动设备的根目录下的特定文件夹中正确加载地理空间数据。

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需求：

shp数据在移动端指定文件夹下存放，例如：sd卡根目录某个文件夹下，如何使用ArcGIS Runtime SDK for Android 100.x 加载

最终效果：

测试数据存放位置：

移动设备根目录下的“GisTest”——“test1”文件夹下。

打印出来的路径形如：/storage/emulated/0/GisTest/test1/bj3857.shp

版本：

ArcGIS Runtime SDK for Android 100 .10

思路：

这个需要用到读取本地文件权限（READ_EXTERNAL_STORAGE），android将其列为危险权限，在android6.0以上系统在使用危险权限时必须进行运行时权限处理。

代码如下：

AndroidManifest.xml

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

strings.xml

<resources>
    <string name="app_name">Feature layer shapefile</string>
    <string name="bj3857_path1">GisTest/test1/bj3857.shp</string>
</resources>

MainActivity.java

package com.esri.arcgisruntime.sample.featurelayershapefile;

import java.io.File;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import com.esri.arcgisruntime.data.ShapefileFeatureTable;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;

public class MainActivity extends AppCompatActivity {

    private MapView mMapView;
    private ArcGISMap map;
    private ShapefileFeatureTable shapefileFeatureTable;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mMapView = findViewById(R.id.mapView);
        map = new ArcGISMap();
        mMapView.setMap(map);

        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{
                    Manifest.permission.READ_EXTERNAL_STORAGE
            }, 1);
        } else {
            loadShp();
        }

    }

    private void loadShp() {
        boolean isSdCardExist = Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED);// 判断sdcard是否存在
        if (isSdCardExist) {
            String sdpath = Environment.getExternalStorageDirectory()
                    .getAbsolutePath();// 获取sdcard的根路径

            //获取shp文件在手机sdcard中的存放路径
            String filepath = sdpath + File.separator + getString(R.string.bj3857_path1);
            Log.d("path", filepath);

            if (!filepath.isEmpty()) {

                shapefileFeatureTable = new ShapefileFeatureTable(filepath);
                final FeatureLayer featureLayer = new FeatureLayer(shapefileFeatureTable);
                map.getOperationalLayers().add(featureLayer);
                featureLayer.addDoneLoadingListener(new Runnable() {
                    @Override
                    public void run() {
                        if (featureLayer.getLoadStatus() == LoadStatus.LOADED) {
                            mMapView.setViewpointAsync(new Viewpoint(featureLayer.getFullExtent()));
                        }
                    }
                });
            }
        } else {
            Toast.makeText(MainActivity.this, "sdcard is not exit", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    loadShp();
                } else {

                    Toast.makeText(this, "not shp", Toast.LENGTH_SHORT).show();
                }
                break;
            default:
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        mMapView.pause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        mMapView.resume();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mMapView.dispose();
    }
}