Toon mmpk in MapActivity (ESRI)

mrezagh

<\/HEAD>

Hallo<\/DIV>

Ik ben nieuw in Android-programmering. Ik heb een programma geschreven om mmpk te tonen in ESRI mapview (100.7.0). Wanneer de mapview in MainActivity is, werkt de app goed. Maar wanneer ik op de knop in MainActivity klik, wordt MapActivity aangeroepen en crasht de app.<\/DIV><\/DIV><\/DIV>

Help me alstublieft<\/P><\/DIV><\/DIV>

 <\/P>

public class <\/SPAN>MainActivity extends <\/SPAN>AppCompatActivity {
     Button btn<\/SPAN>;
<\/SPAN>    <\/SPAN>@Override
<\/SPAN>    <\/SPAN>protected void <\/SPAN>onCreate<\/SPAN>(Bundle savedInstanceState) {
super<\/SPAN>.onCreate(savedInstanceState);
<\/SPAN>        <\/SPAN>setContentView(R.layout.activity_main<\/SPAN>);
<\/SPAN>        <\/SPAN>btn<\/SPAN>=(Button)findViewById(R.id.button<\/SPAN>);
<\/SPAN>    <\/SPAN>}
public void <\/SPAN>btnClick<\/SPAN>(View view) {
        Intent intent = new <\/SPAN>Intent(MainActivity.this,<\/SPAN>MapActivity.class<\/SPAN>);
<\/SPAN>        <\/SPAN>startActivity(intent);
<\/SPAN>    <\/SPAN>}
}<\/PRE>         <\/P> MapActivity<\/SPAN>:<\/P> <\/P>public class <\/SPAN>MapActivity extends <\/SPAN>AppCompatActivity {

private static final <\/SPAN>String TAG <\/SPAN>= MainActivity.class<\/SPAN>.getSimpleName();
<\/SPAN>    private static <\/SPAN>String extSDCardDirName<\/SPAN>;
<\/Span>    private static String filename;
    private static String mmpkFilePath;
    private MapView mMapView;
    private MobileMapPackage mapPackage;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main</ span>)< span s tyle =\ " c olor  cc7 832 " >;
</ span >< span s tyle =\ " c olor  cc7 832 " >        </ span >< span s tyle =\ " c olor :#808080 " >// get the directory
</ span >< span s tyle =\ " c olor :#808080 " >        </ span >< span s tyle =\ " c olor :#9876aa;font-style :italic " >extSDCardDirName </ span >=Environment.< span s tyle =\ " f ont-style:i talic " >getExternalStorageDirectory</ span>() + File.< span s tyle =\ " c olor :#9876aa;font-style:i talic " >separator </ span >+ < span s tyle =\ " c olor :#6a8759 " >\ "mmm/\ "</ span >< span s tyle =\ " c olor  cc7 832 " >;
</ span >< span s tyle =\ " c olor  cc7 832 " >        </ span >< span s tyle =\ " c olor :#808080 " >// get mobile map package filename
</ span >< span s tyle =\ " c olor :#808080 " >        </ span >< span s tyle =\ " c olor :#9876aa;font-style:i talic " >filename </ span >=< span s tyle =\ " c olor :#6a8759 " >\ "maps.mmpk\ "</ span >< span s tyle =\ " c olor  cc7 832 " >;
</ span >< span s tyle =\ " c olor  cc7 832 " >        </ span >< span s tyle =\ " c olor :#808080 " >// create the full path to the mobile map package file
</ span >< span s tyle =\ " c olor :#808080 " >        </ span >< span s tyle =\ " c olor :#9876aa;font-style:i talic " >mmpkFilePath </ span >= < span s tyle =\ " c olor :#9876aa;font-style:i talic " >extSDCardDirName </ span >+ < span s tyle =\ " c olor :#9876aa;font-style:i talic " >filename</ span >< span s tyle =\ " c olor  cc7 832 " >;
</ span >< span s tyle =\ " c olor  cc7 832 " >        </ span >Log.< sp an st yle =\  stijl="kleur: #6897bb;">0<\/SPAN>));
<\/SPAN>                <\/SPAN>mMapView<\/SPAN>.setAttributionTextVisible(false<\/SPAN>);
<\/SPAN>            <\/SPAN>} anders <\/SPAN>{
// log een probleem als het mobile map package niet kan laden
<\/SPAN>                <\/SPAN>Log.e<\/SPAN>(TAG<\/SPAN>, <\/SPAN>mapPackage<\/SPAN>.getLoadError().getMessage());
<\/SPAN>            <\/SPAN>}
        }
       });
<\/SPAN>     }<\/PRE>}<\/PRE>Fout is:<\/P>04-15 12:00:43.653 7426-7426\/ com.mytest.mymap E\/AndroidRuntime: FATALE EXCEPTIE: main<\/P>    Proces: com. mytest<\/SPAN>.mymap, PID: 7426<\/P>    java.lang.NullPointerException: Poging om virtuele methode 'void com.esri.arcgisruntime.mapping.view.MapView.setMap(com.esri.arcgisruntime.mapping.ArcGISMap)' aan te roepen op een null objectreferentie<\/P>        bij com. mytest<\/SPAN>.mymap.MapActivity$1.run(MapActivity.java:77)<\/P>        bij android.os.Handler.handleCallback(Handler.java:739)<\/P>        bij android.os.Handler.dispatchMessage(Handler.java:95)<\/P>        bij android.os.Looper.loop(Looper.java:211)<\/P>        bij android.app.ActivityThread.main(ActivityThread.java:5389)<\/P>        bij java.lang.reflect.Method.invoke(Native Method)<\/P>        bij java.lang.reflect.Method.invoke(Method.java:372)<\/P>        bij com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)<\/P>        bij com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)<\/P> <\/P>Wanneer de volgende voorwaarde <\/SPAN>waar is, is de waarde van mapPackage niet null<\/P>&nbsp ; & nbsp;<\/P>als <\/SPAN>(mapPackage<\/SPAN>.getLoadStatus() == LoadStatus.GELOADD < \/span> && ! < span style = "color : #9876aa ;" > mapPackage < \/span > .getMaps().isEmpty()) {
    < span style = "color : #808080 ;" > // voeg de kaart uit het mobile map package toe aan de MapView
< \/span > < span style = "color : #808080 ;" >    < \/span > < span style = "color : #9876aa ;" > mMapView < \/span > .setMap(< span style = "color : #9876aa ;" > mapPackage < \/span > .getMaps().get(< span style = "color : #6897bb ;" > 0 < \/span > ))< span style = "color : #cc7832 ;" > ;
< \/span > < span style = "color : #cc7832 ;" >    < \/span > < span style = "color : #9876aa ;" > mMapView < \/span > .setAttributionTextVisible(< span style = "color : #cc7832 ;" > false < \/span > )< span style = "color : #cc7832 ;" > ;
< \/span > }< \/pre >< \/body >< \/html >

mrezagh

My mistake is copy code from mainactivity to mapactivity !!!                                                                                            

 

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

replace with

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_map);