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プロジェクトを実行すると、次のエラーでクラッシュします。アクティビティを開始できません。java.lang.NullPointerException：仮想メソッド 'com.google.android.gms.maps.model.Markerヌルオブジェクトリファレンスではcom.google.android.gms.maps.GoogleMap.addMarker（com.google.android.gms.maps.model.MarkerOptions） ' 誰でもこの問題の解決や、AndroidのGoogleマップアクティビティで複数の場所を作成するための別のアイデアを手伝ってもらえますか？複数の場所がアンドロイドを使用してGoogleマップに表示されます
--------- beginning of crash
08-10 12:57:13.476 3250-3250/daffodilvarsity.edu.bd.studentportal E/AndroidRuntime: FATAL EXCEPTION: main
Process: daffodilvarsity.edu.bd.studentportal, PID: 3250
java.lang.RuntimeException: Unable to start activity ComponentInfo{daffodilvarsity.edu.bd.studentportal/daffodilvarsity.edu.bd.studentportal.LocationShareMapsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.model.Marker com.google.android.gms.maps.GoogleMap.addMarker(com.google.android.gms.maps.model.MarkerOptions)' on a null object reference
LogcatエラーがAndroidManifest.xmlを
<?xml version="1.0" encoding="utf-8"?>
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<permission
android:name="com.example.mapexdemo.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".LoginActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LocationShareMapsActivity"
android:label="@string/title_activity_location_share_maps" />
<meta-data
android:name="com.google.android.gms.vision"
android:value="6587000" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyCBe_7AckAvLMRIryGwRSvo-lhpv-VTbSY" />
</application>
</manifest>
これはBiuld.gradleファイル
--------- beginning of crash
08-10 12:57:13.476 3250-3250/daffodilvarsity.edu.bd.studentportal E/AndroidRuntime: FATAL EXCEPTION: main
Process: daffodilvarsity.edu.bd.studentportal, PID: 3250
java.lang.RuntimeException: Unable to start activity ComponentInfo{daffodilvarsity.edu.bd.studentportal/daffodilvarsity.edu.bd.studentportal.LocationShareMapsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.model.Marker com.google.android.gms.maps.GoogleMap.addMarker(com.google.android.gms.maps.model.MarkerOptions)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.model.Marker com.google.android.gms.maps.GoogleMap.addMarker(com.google.android.gms.maps.model.MarkerOptions)' on a null object reference
at daffodilvarsity.edu.bd.studentportal.LocationShareMapsActivity.plotMarkers(LocationShareMapsActivity.java:107)
at daffodilvarsity.edu.bd.studentportal.LocationShareMapsActivity.onCreate(LocationShareMapsActivity.java:54)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
08-10 12:57:15.409 3250-3494/daffodilvarsity.edu.bd.studentportal W/DynamiteModule: Local module descriptor class for com.google.android.gms.googlecertificates not found.
08-10 12:57:15.410 3250-3494/daffodilvarsity.edu.bd.studentportal I/DynamiteModule: Considering local module com.google.android.gms.googlecertificates:0 and remote module com.google.android.gms.googlecertificates:1
08-10 12:57:15.410 3250-3494/daffodilvarsity.edu.bd.studentportal I/DynamiteModule: Selected remote version of com.google.android.gms.googlecertificates, version >= 1
08-10 12:57:15.433 3250-3494/daffodilvarsity.edu.bd.studentportal D/ChimeraFileApk: Primary ABI of requesting process is x86_64
08-10 12:57:15.434 3250-3494/daffodilvarsity.edu.bd.studentportal D/ChimeraFileApk: Classloading successful. Optimized code found.
08-10 12:57:15.434 3250-3494/daffodilvarsity.edu.bd.studentportal D/GoogleCertificates: com.google.android.gms.googlecertificates module is loaded
08-10 12:57:15.495 3250-3494/daffodilvarsity.edu.bd.studentportal D/GoogleCertificatesImpl: Fetched 318 Google certificates
08-10 13:15:06.095 7141-7141/daffodilvarsity.edu.bd.studentportal I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead.
08-10 13:15:06.096 7141-7141/daffodilvarsity.edu.bd.studentportal I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead.
08-10 13:15:06.108 7141-7155/daffodilvarsity.edu.bd.studentportal D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
[ 08-10 13:15:06.112 7141: 7141 D/ ]
HostConnection::get() New Host Connection established 0x7fcde51d17c0, tid 7141
[ 08-10 13:15:06.181 7141: 7155 D/ ]
HostConnection::get() New Host Connection established 0x7fcde8d90300, tid 7155
08-10 13:15:06.187 7141-7155/daffodilvarsity.edu.bd.studentportal I/OpenGLRenderer: Initialized EGL, version 1.4
08-10 13:15:07.444 7141-7141/daffodilvarsity.edu.bd.studentportal I/Choreographer: Skipped 71 frames! The application may be doing too much work on its main thread.
ですここで
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "24.0.1"
useLibrary 'org.apache.http.legacy'
dexOptions {
incremental true
javaMaxHeapSize "2048M"
}
defaultConfig {
applicationId "daffodilvarsity.edu.bd.studentportal"
minSdkVersion 14
targetSdkVersion 23
versionCode 1
versionName "1.0"
// Enabling multidex support.
multiDexEnabled true
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.support:design:23.4.0'
compile 'com.google.android.gms:play-services:9.2.1'
compile 'com.google.android.gms:play-services-maps:4.3.23'
}
package daffodilvarsity.edu.bd.studentportal;
public class MyMarker{
private String mLabel;
private String mIcon;
private Double mLatitude;
private Double mLongitude;
public MyMarker(String label, String icon, Double latitude, Double longitude) {
this.mLabel = label;
this.mLatitude = latitude;
this.mLongitude = longitude;
this.mIcon = icon;
}
public String getmLabel() {
return mLabel;
}
public void setmLabel(String mLabel) {
this.mLabel = mLabel;
}
public String getmIcon() {
return mIcon;
}
public void setmIcon(String icon) {
this.mIcon = icon;
}
public Double getmLatitude() {
return mLatitude;
}
public void setmLatitude(Double mLatitude) {
this.mLatitude = mLatitude;
}
public Double getmLongitude() {
return mLongitude;
}
public void setmLongitude(Double mLongitude) {
this.mLongitude = mLongitude;
}
}
ゲッターとセッターのためのMyMaker.javaファイルである私のメインのJavaファイルLocationShareMapsActivity.java
package daffodilvarsity.edu.bd.studentportal;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import java.util.ArrayList;
import java.util.HashMap;
public class LocationShareMapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private ArrayList<MyMarker> mMyMarkersArray = new ArrayList<MyMarker>();
private HashMap<Marker, MyMarker> mMarkersHashMap;
public LocationShareMapsActivity() {
//empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_location_share_maps);
// Initialize the HashMap for Markers and MyMarker object
mMarkersHashMap = new HashMap<Marker, MyMarker>();
mMyMarkersArray.add(new MyMarker("Brasil", "icon1", Double.parseDouble("-28.5971788"), Double.parseDouble("-52.7309824")));
mMyMarkersArray.add(new MyMarker("United States", "icon2", Double.parseDouble("33.7266622"), Double.parseDouble("-87.1469829")));
mMyMarkersArray.add(new MyMarker("Canada", "icon3", Double.parseDouble("51.8917773"), Double.parseDouble("-86.0922954")));
mMyMarkersArray.add(new MyMarker("England", "icon4", Double.parseDouble("52.4435047"), Double.parseDouble("-3.4199249")));
mMyMarkersArray.add(new MyMarker("España", "icon5", Double.parseDouble("41.8728262"), Double.parseDouble("-0.2375882")));
mMyMarkersArray.add(new MyMarker("Portugal", "icon6", Double.parseDouble("40.8316649"), Double.parseDouble("-4.936009")));
mMyMarkersArray.add(new MyMarker("Deutschland", "icon7", Double.parseDouble("51.1642292"), Double.parseDouble("10.4541194")));
mMyMarkersArray.add(new MyMarker("Atlantic Ocean", "icondefault", Double.parseDouble("-13.1294607"), Double.parseDouble("-19.9602353")));
setUpMap();
plotMarkers(mMyMarkersArray);
}
private void setUpMap() {
if (mMap == null) {
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
// Check if we were successful in obtaining the map.
if (mMap != null) {
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(com.google.android.gms.maps.model.Marker marker)
{
marker.showInfoWindow();
return true;
}
});
}
}
else
Toast.makeText(getApplicationContext(), "Unable to create Maps", Toast.LENGTH_SHORT).show();
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
setUpMap();
}
private void plotMarkers(ArrayList<MyMarker> markers)
{
if(markers.size() > 0)
{
for (MyMarker myMarker : markers) {
MarkerOptions markerOption = new MarkerOptions().position(new LatLng(myMarker.getmLatitude(), myMarker.getmLongitude()));
markerOption.icon(BitmapDescriptorFactory.fromResource(R.drawable.currentlocation_icon));
Marker currentMarker = mMap.addMarker(markerOption);
mMarkersHashMap.put(currentMarker, myMarker);
mMap.setInfoWindowAdapter(new MarkerInfoWindowAdapter());
}
}
}
private int manageMarkerIcon(String markerIcon) {
if (markerIcon.equals("icon1"))
return R.drawable.icon1;
else if(markerIcon.equals("icon2"))
return R.drawable.icon2;
else if(markerIcon.equals("icon3"))
return R.drawable.icon3;
else if(markerIcon.equals("icon4"))
return R.drawable.icon4;
else if(markerIcon.equals("icon5"))
return R.drawable.icon5;
else if(markerIcon.equals("icon6"))
return R.drawable.icon6;
else if(markerIcon.equals("icon7"))
return R.drawable.icon7;
else
return R.drawable.icondefault;
}
public class MarkerInfoWindowAdapter implements GoogleMap.InfoWindowAdapter {
public MarkerInfoWindowAdapter() {
}
@Override
public View getInfoWindow(Marker marker) {
return null;
}
@Override
public View getInfoContents(Marker marker) {
View v = getLayoutInflater().inflate(R.layout.infowindow_layout, null);
MyMarker myMarker = mMarkersHashMap.get(marker);
ImageView markerIcon = (ImageView) v.findViewById(R.id.marker_icon);
TextView markerLabel = (TextView)v.findViewById(R.id.marker_label);
TextView anotherLabel = (TextView)v.findViewById(R.id.another_label);
markerIcon.setImageResource(manageMarkerIcon(myMarker.getmIcon()));
markerLabel.setText(myMarker.getmLabel());
anotherLabel.setText("A custom text");
return v;
}
}
}
です
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="daffodilvarsity.edu.bd.studentportal.LocationShareMapsActivity" />
infowindow_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/marker_layout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="@+id/station_info_layout"
android:layout_width="205dp"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="@+id/marker_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/marker_label"
android:layout_marginLeft="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="bold" />
</LinearLayout>
<TextView
android:id="@+id/another_label"
android:layout_marginLeft="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="bold" />
</LinearLayout>
同じ問題がまだ残っています –
あなたが行った変更を親切に更新します。 –