android - 无法在Android studio中使用SK map

Question

我正在尝试使用 Android 版 SK map SDK，但遇到了一些问题。我已按照此网站上的指导进行操作:http://developer.skobbler.com/getting-started/android用于在 Android 中集成 SDK，但我似乎仍然在某个地方犯了错误。问题是:一旦我启动应用程序，第一个 Activity 就正确启动，但是一旦初始化 SK map 库并创建 map Activity ，应用程序就会崩溃，而不会显示任何错误。 这是我的初始化代码:

public class Map_initialization extends AppCompatActivity implements SKMapsInitializationListener {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout);
    SKMaps.getInstance().initializeSKMaps(getApplication(),this);
}

@Override
public void onLibraryInitialized(boolean b) {  ///once maps initialized then go to map activity
    Intent intent=new Intent(this,MainActivity.class);
    startActivity(intent);
}
}

这是我的 map Activity 代码:此处创建了 map 。

public class MainActivity extends AppCompatActivity implements SKMapSurfaceListener {

double lat;
double lng;
float zoom_level=0;
String Location="19.875692,75.353020";
// get the annotation object
SKAnnotation new_loc = new SKAnnotation(10); //marker which can be visible on map


/**
 * Surface view for displaying the map
 */
private SKMapSurfaceView mapView;

/**
 * the view that holds the map view
 */
SKMapViewHolder mapHolder;

// get the callout view object from the map holder
SKCalloutView mapPopup = mapHolder.getCalloutView();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mapHolder = (SKMapViewHolder) findViewById(R.id.map_surface_holder);
}
 @Override
protected void onDestroy() {
    super.onDestroy();
    SKMaps.getInstance().destroySKMaps();
}

public void Show_Location()
{

    lat=Double.valueOf(Location.substring(0,9));//extracting latitude
    lng=Double.valueOf(Location.substring(10,Location.length()));//extracting longitude
    zoom_level=16;
    new_loc.setAnnotationType(SKAnnotation.SK_ANNOTATION_TYPE_BLUE);
    new_loc.setLocation(new SKCoordinate(lat,lng));
    mapView.animateToZoomLevel(zoom_level);
    mapView.animateToLocation(new SKCoordinate(lat,lng),1000);
    mapView.addAnnotation(new_loc, SKAnimationSettings.ANIMATION_PIN_DROP);//adding marker

    // set the callout view’s background color
    mapPopup.setViewColor(Color.argb(255, 200, 200, 255));
    mapPopup.showAtLocation(new SKCoordinate(lat,lng),true);
}

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

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

@Override
public void onActionPan() {
    zoom_level--;
    mapView.setZoom(zoom_level);
}

@Override
public void onActionZoom() {
    zoom_level++;
    mapView.setZoom(zoom_level);
}

@Override
public void onSurfaceCreated(SKMapViewHolder skMapViewHolder) { //on map surface created
    mapView = mapHolder.getMapSurfaceView();
    mapView.getMapSettings().setMapPoiIconsShown(true);
    mapView.getMapSettings().setMapPanningEnabled(true);
    mapView.getMapSettings().setMapZoomingEnabled(true);
}

@Override
public void onMapRegionChanged(SKCoordinateRegion skCoordinateRegion) {

}

@Override
public void onMapRegionChangeStarted(SKCoordinateRegion skCoordinateRegion) {

}

@Override
public void onMapRegionChangeEnded(SKCoordinateRegion skCoordinateRegion) {

}

@Override
public void onDoubleTap(SKScreenPoint skScreenPoint) {

}

@Override
public void onSingleTap(SKScreenPoint skScreenPoint) {

}

@Override
public void onRotateMap() {

}

@Override
public void onLongPress(SKScreenPoint skScreenPoint) {

}

@Override
public void onInternetConnectionNeeded() {

}

@Override
public void onMapActionDown(SKScreenPoint skScreenPoint) {

}

@Override
public void onMapActionUp(SKScreenPoint skScreenPoint) {

}

@Override
public void onPOIClusterSelected(SKPOICluster skpoiCluster) {

}

@Override
public void onMapPOISelected(SKMapPOI skMapPOI) {

}

@Override
public void onAnnotationSelected(SKAnnotation skAnnotation) {

}

@Override
public void onCustomPOISelected(SKMapCustomPOI skMapCustomPOI) {

}

@Override
public void onCompassSelected() {

}

@Override
public void onCurrentPositionSelected() {

}

@Override
public void onObjectSelected(int i) {

}

@Override
public void onInternationalisationCalled(int i) {

}

@Override
public void onBoundingBoxImageRendered(int i) {

}

@Override
public void onGLInitializationError(String s) {
    Toast.makeText(getApplicationContext(),"ERROR:"+s,Toast.LENGTH_LONG).show();

}

@Override
public void onScreenshotReady(Bitmap bitmap) {

}
}

这是我的应用程序的 gradle:

buildscript {
repositories {
    mavenCentral()
}
dependencies {
    classpath 'com.android.tools.build:gradle:2.1.2'
}
}
//apply plugin: 'java'
repositories {
maven {
    url "http://developer.skobbler.com/maven/"
}
}

configurations {
skobblersdk
}
apply plugin: 'com.android.application'
android {

compileSdkVersion 23
buildToolsVersion "24.0.0"
defaultConfig {
    applicationId "com.example.ahirrao.gps"
    minSdkVersion 16
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'),       
    'proguard-rules.pro'
        signingConfig signingConfigs.config
    }

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0'
skobblersdk "com.skobbler.ngx:SKMaps:3.0.0"
compile files('libs/SKMaps.jar')
}

def assetsPath = "$projectDir/src/main/assets"
def libsPath = "$projectDir/libs"
def jniLibsPath = "$projectDir/src/main/jniLibs"

task installSKMaps << {
copy {
    from configurations.skobblersdk
    into "$buildDir/skobblersdk-down"
    rename { String fileName -> 'skobblersdkres.zip' }
}
copy {
    from zipTree("$buildDir/skobblersdk-down/skobblersdkres.zip")
    into "$buildDir/skobblersdk-down"
}
delete("$jniLibsPath",
        "$assetsPath/SKMaps.zip",
        "$libsPath/SKMaps.jar")
copy {
    from "${buildDir}/skobblersdk-down/jniLibs"
    into "$jniLibsPath"
}
copy {
    from "${buildDir}/skobblersdk-down/"
    into "$assetsPath"
}
copy {
    from "${buildDir}/skobblersdk-down/SKMaps.jar"
    into "$libsPath"
}
delete("$buildDir/skobblersdk-down")
delete(configurations.skobblersdk)
}

这是我的 map 布局:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<com.skobbler.ngx.map.SKMapViewHolder
    android:id="@+id/map_surface_holder"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />



</RelativeLayout>

在Skobbler的上述网站上，他们在gradle中使用JAVA插件给出了代码，但我无法使用它，因为它与android插件不兼容。

 E/AndroidRuntime: FATAL EXCEPTION: main

 Process: com.example.ahirrao.gps, PID: 541

 java.lang.RuntimeException: Unable to instantiate activity   
ComponentInfo{com.example.ahirrao.gps/com.example.ahirrao.gps.MainActivity}: 
 java.lang.NullPointerException at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2264)
at       
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5299)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.ahirrao.gps.MainActivity.<init>(MainActivity.java:53)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1215)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2255)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 
at android.app.ActivityThread.access$800(ActivityThread.java:151) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321) 
at android.os.Handler.dispatchMessage(Handler.java:110) 
at android.os.Looper.loop(Looper.java:193) 
at android.app.ActivityThread.main(ActivityThread.java:5299) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:515) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641) 
at dalvik.system.NativeStart.main(Native Method) 

Answer 1

我发现了错误。我犯了错误。也许它会对某人有所帮助。

我在创建 map Surface之前调用了所有视觉元素，这导致了诸如空指针异常之类的错误并兑现了应用程序。所以程序是测试mapView为 null 或在 onSurfaceCreated 中设置 bool 值方法并测试是否创建 map View ，然后在 map 上绘制注释等。参见onCreate我们必须在调用 onSurfaceCreated 时设置 MapSurface 监听器我还没有这样做，因此导致了错误，例如没有绘制注释。