我正在创建一个带有标记和atatic长度和纬度的谷歌地图。但是当我运行项目时，它将GoogleMap地图设为null。我已经发布了以下代码。
MainActivity：
public class MainActivity extends Activity {
static final LatLng HAMBURG = new LatLng(53.558, 9.927);
static final LatLng KIEL = new LatLng(53.551, 9.993);
private GoogleMap map;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
Log.e("map",""+map);
Marker hamburg = map.addMarker(new MarkerOptions().position(HAMBURG)
.title("Hamburg"));
Marker kiel = map.addMarker(new MarkerOptions()
.position(KIEL)
.title("Kiel")
.snippet("Kiel is cool")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
}
的xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</RelativeLayout>
清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.staticgooglemap"
android:versionCode="1"
android:versionName="1.0" >
<permission
android:name="com.vogella.android.locationapi.maps.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="21" />
<uses-permission android:name="com.vogella.android.locationapi.maps.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyCIBfnWMI4FblFgD323o4IFaLLgfURUJO4" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version"
/>
</application>
</manifest>
logcat的：
09-05 09:45:33.478: W/dalvikvm(5060): VFY: unable to find class referenced in signature (Landroid/support/v4/app/Fragment;)
09-05 09:45:33.498: W/dalvikvm(5060): VFY: unable to find class referenced in signature (Landroid/support/v4/app/Fragment;)
09-05 09:45:33.498: W/dalvikvm(5060): VFY: unable to find class referenced in signature (Landroid/support/v4/app/Fragment;)
09-05 09:45:33.538: W/dalvikvm(5060): VFY: unable to find class referenced in signature (Landroid/support/v4/app/Fragment;)
09-05 09:45:33.538: W/dalvikvm(5060): VFY: unable to find class referenced in signature (Landroid/support/v4/app/Fragment;)
09-05 09:45:33.548: E/dalvikvm(5060): Could not find class 'android.support.v4.app.FragmentActivity', referenced from method com.google.android.gms.common.GooglePlayServicesUtil.b
09-05 09:45:33.578: W/dalvikvm(5060): VFY: unable to resolve instanceof 139 (Landroid/support/v4/app/FragmentActivity;) in Lcom/google/android/gms/common/GooglePlayServicesUtil;
09-05 09:45:33.578: D/dalvikvm(5060): VFY: replacing opcode 0x20 at 0x0008
09-05 09:45:33.578: E/dalvikvm(5060): Could not find class 'android.support.v4.app.FragmentActivity', referenced from method com.google.android.gms.common.GooglePlayServicesUtil.b
09-05 09:45:33.578: W/dalvikvm(5060): VFY: unable to resolve check-cast 139 (Landroid/support/v4/app/FragmentActivity;) in Lcom/google/android/gms/common/GooglePlayServicesUtil;
09-05 09:45:33.578: D/dalvikvm(5060): VFY: replacing opcode 0x1f at 0x000c
09-05 09:45:33.608: W/dalvikvm(5060): VFY: unable to find class referenced in signature (Landroid/support/v4/app/Fragment;)
09-05 09:45:33.648: W/dalvikvm(5060): VFY: unable to find class referenced in signature (Landroid/support/v4/app/Fragment;)
09-05 09:45:33.798: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:33.888: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:33.948: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:33.998: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:34.038: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:34.118: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:34.158: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:34.188: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:34.198: D/dalvikvm(5060): GC_CONCURRENT freed 192K, 10% free 2644K/2936K, paused 24ms+3ms, total 162ms
09-05 09:45:34.198: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:34.238: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:34.258: W/GooglePlayServicesUtil(5060): Google Play services out of date. Requires 5089000 but found 3136130
09-05 09:45:34.258: E/map(5060): null
09-05 09:45:34.258: D/AndroidRuntime(5060): Shutting down VM
09-05 09:45:34.268: W/dalvikvm(5060): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
09-05 09:45:34.268: E/AndroidRuntime(5060): FATAL EXCEPTION: main
09-05 09:45:34.268: E/AndroidRuntime(5060): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.staticgooglemap/com.example.staticgooglemap.MainActivity}: java.lang.NullPointerException
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.app.ActivityThread.access$600(ActivityThread.java:141)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.os.Handler.dispatchMessage(Handler.java:99)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.os.Looper.loop(Looper.java:137)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.app.ActivityThread.main(ActivityThread.java:5041)
09-05 09:45:34.268: E/AndroidRuntime(5060): at java.lang.reflect.Method.invokeNative(Native Method)
09-05 09:45:34.268: E/AndroidRuntime(5060): at java.lang.reflect.Method.invoke(Method.java:511)
09-05 09:45:34.268: E/AndroidRuntime(5060): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-05 09:45:34.268: E/AndroidRuntime(5060): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-05 09:45:34.268: E/AndroidRuntime(5060): at dalvik.system.NativeStart.main(Native Method)
09-05 09:45:34.268: E/AndroidRuntime(5060): Caused by: java.lang.NullPointerException
09-05 09:45:34.268: E/AndroidRuntime(5060): at com.example.staticgooglemap.MainActivity.onCreate(MainActivity.java:31)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.app.Activity.performCreate(Activity.java:5104)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
09-05 09:45:34.268: E/AndroidRuntime(5060): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
09-05 09:45:34.268: E/AndroidRuntime(5060): ... 11 more
答案 0 :(得分：1)
首先检查一下。
if(map !=null){
Marker hamburg = map.addMarker(new MarkerOptions().position(HAMBURG)
.title("Hamburg"));
Marker kiel = map.addMarker(new MarkerOptions()
.position(KIEL)
.title("Kiel")
.snippet("Kiel is cool")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
}
还要在清单文件中添加此行。
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />