ArcGIS Runtime SDK for Android 100.3.0加载离线.slpk文件

版权声明：转载请注明出处： https://blog.csdn.net/gislaozhang/article/details/81541825

需求：

采用ArcGIS Runtime SDK for Android 100.3.0加载离线slpk文件

关于slpk的介绍，请参考ArcGIS官方介绍http://pro.arcgis.com/zh-cn/pro-app/help/sharing/overview/scene-layer-package.htm

效果图：

• ArcGIS Pro中加载slpk文件

• Android真机中加载slpk文件 

代码实现：

（1）MainActivity.java

import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;

import com.esri.arcgisruntime.layers.ArcGISSceneLayer;
import com.esri.arcgisruntime.mapping.ArcGISScene;
import com.esri.arcgisruntime.mapping.view.Camera;
import com.esri.arcgisruntime.mapping.view.SceneView;

import java.io.File;

/**
 * 加载slpk
 */
public class MainActivity1 extends AppCompatActivity {

    private SceneView mSceneView;
    private ArcGISScene scene;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // create a scene and add a basemap to it
         scene = new ArcGISScene();
        // scene.setBasemap(Basemap.createImagery());

        mSceneView = (SceneView) findViewById(R.id.sceneView);
        mSceneView.setScene(scene);

        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
            Log.d("path", sdpath.toString());

            //获取tpk文件在手机sdcard中的存放路径
            String filepath = sdpath + File.separator + "Buildings.slpk";
            if (!filepath.isEmpty()) {

                // add a scene service to the scene for viewing buildings
                ArcGISSceneLayer sceneLayer = new ArcGISSceneLayer(filepath);
                scene.getOperationalLayers().add(sceneLayer);

                // add a camera and initial camera position
                Camera camera = new Camera(39.915559, 116.403811, 50, 345, 65, 0);
                mSceneView.setViewpointCamera(camera);
            }
        } else {
            Toast.makeText(MainActivity1.this, "sdcard is not exit", Toast.LENGTH_SHORT).show();
        }
    }

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

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

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

代码中通过创建SceneView实例对象，同时创建一个ArcGISScene实例，并将ArcGISScene实例给SceneView实例对象的setScene()方法，作为其参数；判断是否存在sdcard，如果存在则获取Sdcard根目录路径，并将获取的slpk文件路径传给ArcGISSceneLayer构造函数；最终通过ArcGISScene实例对象的getOperationalLayers().add(sceneLayer)加载slpk文件。

此外，要注意Camera构造函数中参数的设置，Camera类代表了一个不变的对象，拥有位置、方向和倾斜角度。

（2）activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <!-- SceneView -->
    <com.esri.arcgisruntime.mapping.view.SceneView
        android:id="@+id/sceneView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"></com.esri.arcgisruntime.mapping.view.SceneView>
</android.support.constraint.ConstraintLayout>

（3）AndroidManifest.xml中添加权限

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-feature android:glEsVersion="0x00020000" android:required="true" />

slpk文件存放，可以通过Android Studio编译器的Device File Explorer进行上传，下图是将slpk文件上传到手机sdcard根目录下：

代码中获取的sdcard根目录路径是storage/emulated/0，关于这个根目录到底在手机中什么位置，可以参考https://blog.csdn.net/gislaozhang/article/details/81318520 这篇博文。