无论我做什么，我的代码似乎都在getMap（）崩溃。我几乎在所有地方都尝试过调整代码。我之前已经创建了这个应用程序，但是由于计算机崩溃，我不得不重新构建。我的一些代码。现在它崩溃了。
我的主要代码：
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
public class FishFishSpotActivity extends Activity{
public static final String XCORD = "xcord";
public static final String YCORD = "ycord";
public static final String NOTE = "note";
public static final String SAVED = "saved";
public static final String ID = "id";
TextView XCord= null;
TextView YCord= null;
TextView Note= null;
int Id = 0;
Boolean Saved = null;
private GoogleMap map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fish_fish_spot);
initializeMap();
}
protected void onStart(){
map.isMyLocationEnabled();
}
@Override
protected void onResume() {
super.onResume();
}
public boolean onCreateOptionsMenu(Menu menu){
return false;
}
public void onMapClick(LatLng point){
map.addMarker(new MarkerOptions().position(point));
}
public void onMarkerClick(Marker marker){
}
public static void SpotSaved(boolean saved, String A){
}
private void initializeMap()
{
if (map == null) {
map = ((MapFragment) getFragmentManager().findFragmentById(
R.id.map)).getMap();
// check if map is created successfully or not
if (map == null) {
Toast.makeText(getApplicationContext(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
}
}
这是我的管理员：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Nick.fishfishspot"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="19" />
<permission
android:name="com.Nick.fishfishspot.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<uses-permission android:name="com.Nick.fishfishspot.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<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"/>
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="key is here"/>
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<activity
android:name="com.Nick.fishfishspot.FishFishSpotActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
这是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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.Nick.fishfishspot.FishFishSpotActivity$PlaceholderFragment" >
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment"/>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="go" />
<EditText
android:id="@+id/x_cord"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:ems="10" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/y_cord"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/x_cord"
android:layout_alignBottom="@+id/x_cord"
android:layout_toLeftOf="@id/button1"
android:layout_toRightOf="@+id/x_cord"
android:ems="10" />
这是错误：
05-05 22:44:53.390: E/AndroidRuntime(24604): FATAL EXCEPTION: main
05-05 22:44:53.390: E/AndroidRuntime(24604): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Nick.fishfishspot/com.Nick.fishfishspot.FishFishSpotActivity}:java.lang.NullPointerException
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2304)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.app.ActivityThread.access$700(ActivityThread.java:165)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1326)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.os.Handler.dispatchMessage(Handler.java:99)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.os.Looper.loop(Looper.java:137)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.app.ActivityThread.main(ActivityThread.java:5450)
05-05 22:44:53.390: E/AndroidRuntime(24604): at java.lang.reflect.Method.invokeNative(Native Method)
05-05 22:44:53.390: E/AndroidRuntime(24604): at java.lang.reflect.Method.invoke(Method.java:525)
05-05 22:44:53.390: E/AndroidRuntime(24604): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
05-05 22:44:53.390: E/AndroidRuntime(24604): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
05-05 22:44:53.390: E/AndroidRuntime(24604): at dalvik.system.NativeStart.main(Native Method)
05-05 22:44:53.390: E/AndroidRuntime(24604): Caused by: java.lang.NullPointerException
05-05 22:44:53.390: E/AndroidRuntime(24604): at com.Nick.fishfishspot.FishFishSpotActivity.initializeMap(FishFishSpotActivity.java:76)
05-05 22:44:53.390: E/AndroidRuntime(24604): at com.Nick.fishfishspot.FishFishSpotActivity.onCreate(FishFishSpotActivity.java:38)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.app.Activity.performCreate(Activity.java:5369)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
05-05 22:44:53.390: E/AndroidRuntime(24604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)
05-05 22:44:53.390: E/AndroidRuntime(24604): ... 11 more
最佳答案
你不见了
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
在清单的应用标签中
getMap()可以返回null。您可以在初始化GoogleMap对象之前检查Google Play服务的可用性只有当基础
地图系统已加载，并且片段中的基础视图存在。
此类会自动初始化地图系统和视图；
但是您不能保证它准备就绪，因为这
取决于Google Play服务APK的可用性。如果一个
GoogleMap不可用，getMap（）将返回null。
另外，
tools:context="com.Nick.fishfishspot.FishFishSpotActivity$PlaceholderFragment"还会提示您在Activity中初始化MapFragment属于片段。如果要在片段内映射，则需要扩展
MapFragment或在片段布局中使用MapView。Android - android.view.InflateException: Binary XML file line #8: Error inflating class fragment