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

• 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。
 
文章来源：https://blog.csdn.net/gislaozhang/article/details/81541825