我正在尝试制作一个简单的程序.. 单击第一个按钮时。 placepicker已打开。 ..选择一个地方，再次打开mainactivity ..当点击第二个按钮时..我想传递地名，Lat和long传递给showInMaps活动..但是当这个活动被打开时..应用程序停止。请帮忙
MainActvity.java
package com.example.akshay.myapplication;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesNotAvailableException;
import com.google.android.gms.common.GooglePlayServicesRepairableException;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.places.Place;
import com.google.android.gms.location.places.ui.PlacePicker;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.MarkerOptions;
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
Button chooseLoc , showInMap;
PlacePicker.IntentBuilder intentBuilder;
private static final int PLACE_PICKER_REQUEST = 1;
public LatLng gotLatLng;
String placeName;
String plName;
Double gotLat, gotLong;
static final String LOG_TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
chooseLoc = (Button) findViewById((R.id.bOpenMap));
showInMap = (Button) findViewById(R.id.bShowInMap);
chooseLoc.setOnClickListener(this);
showInMap.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId())
{
case R.id.bOpenMap:
chooseLoc();
break;
case R.id.bShowInMap:
Intent in = new Intent(MainActivity.this , showInMaps.class);
in.putExtra("pName", plName);
gotLat= gotLatLng.latitude;
gotLong = gotLatLng.longitude;
in.putExtra("Lat", gotLat);
in.putExtra("Log", gotLong);
startActivity(in);
break;
}
}
public void chooseLoc()
{
try {
intentBuilder =new PlacePicker.IntentBuilder();
Intent intent = intentBuilder.build(MainActivity.this);
startActivityForResult(intent, PLACE_PICKER_REQUEST);
} catch (GooglePlayServicesRepairableException e) {
e.printStackTrace();
Log.d(LOG_TAG, "Error In Repairable");
} catch (GooglePlayServicesNotAvailableException e) {
Toast.makeText(MainActivity.this, "Google Play Services is not available.",
Toast.LENGTH_LONG)
.show();
Log.d(LOG_TAG, "Error In NotAvail");
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PLACE_PICKER_REQUEST) {
if (resultCode == RESULT_OK) {
Place place = PlacePicker.getPlace(data, this);
gotLatLng = place.getLatLng();
plName = (String) place.getName();
placeName = String.format("Place: %s", place.getName());
Toast.makeText(this, placeName, Toast.LENGTH_LONG).show();
Toast.makeText(this, plName, Toast.LENGTH_LONG).show();
}
}
}
}
showInMaps.java
package com.example.akshay.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
/**
* Created by Akshay on 7/12/2015.
*/
public class showInMaps extends Activity {
Double lat, longi;
GoogleMap mMaps;
String place;
String latLong;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.showinmaps);
GoogleMap mMaps = null;
Intent gotIntent = new Intent();
place = gotIntent.getStringExtra("plName");
lat = gotIntent.getExtras().getDouble("Lat");
longi = gotIntent.getExtras().getDouble("Log");
if (mMaps == null) {
LatLng mm = new LatLng(lat, longi);
mMaps = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
mMaps.addMarker(new MarkerOptions().position(mm).title("Hello"));
}
}
}
activitymain.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=".MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Choose Place"
android:id="@+id/bOpenMap"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show In Map"
android:id="@+id/bShowInMap"
android:layout_below="@+id/bOpenMap"
android:layout_alignParentStart="true"
android:layout_marginTop="48dp" />
</RelativeLayout>
showinmaps.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.akshay.myapplication" >
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<!-- Required to show current location -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
>
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version"/>
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="AIzaSyCuZFbNaf6RGqU0C4uDAbNJQgMTDlsKqqE"/>
<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>
<activity
android:name=".showInMaps"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.example.akshay.myapplication.SHOWINMAPS" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
logcat的：
07-12 15:28:43.016 955-1758/? E/PersonaManagerService﹕ inState(): stateMachine is null !!
07-12 15:28:43.026 955-1258/? E/ActivityManager﹕ checkUser: useridlist=null, currentuser=0
07-12 15:28:43.026 955-1258/? E/ActivityManager﹕ checkUser: useridlist=null, currentuser=0
07-12 15:28:43.026 955-1258/? E/ActivityManager﹕ checkUser: useridlist=null, currentuser=0
07-12 15:28:43.026 955-1258/? E/ActivityManager﹕ checkUser: useridlist=null, currentuser=0
07-12 15:28:43.036 2399-2399/com.example.akshay.myapplication E/Zygote﹕ MountEmulatedStorage()
07-12 15:28:43.036 2399-2399/com.example.akshay.myapplication E/Zygote﹕ v2
07-12 15:28:43.046 2399-2399/com.example.akshay.myapplication E/SELinux﹕ [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
07-12 15:28:45.706 955-1756/? E/PersonaManagerService﹕ inState(): stateMachine is null !!
07-12 15:28:46.016 955-1004/? E/LocSvc_utils_cfg﹕ W/loc_read_sec_gps_conf: no secgps conf file, using defaults
07-12 15:28:46.046 955-1004/? E/LocSvc_utils_cfg﹕ W/loc_read_sec_gps_conf: no secgps conf file, using defaults
07-12 15:28:46.076 955-1006/? E/Sensors﹕ Sensor : Meta event
07-12 15:28:46.096 955-1537/? E/LocSvc_ApiV02﹕ I/virtual loc_api_adapter_err LocApiV02::startFix(const LocPosMode&):434]: position_mode=0.
07-12 15:28:46.116 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalRespCb(locClientHandleType, uint32_t, locClientRespIndUnionType, void*) line 125 QMI_LOC_SET_OPERATION_MODE_REQ_V02
07-12 15:28:46.126 955-1537/? E/LocSvc_ApiV02﹕ I/virtual loc_api_adapter_err LocApiV02::startFix(const LocPosMode&):434]: position_mode=0.
07-12 15:28:46.156 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalRespCb(locClientHandleType, uint32_t, locClientRespIndUnionType, void*) line 125 QMI_LOC_SET_OPERATION_MODE_REQ_V02
07-12 15:28:46.176 955-955/? E/LocSvc_flp﹕ I/===> int flp_inject_location(FlpLocation*) line 222
07-12 15:28:46.186 955-1263/? E/WifiStateMachine﹕ WifiStateMachine CMD_START_SCAN source 10034 txSuccessRate=9.97 rxSuccessRate=8.87 targetRoamBSSID=90:f6:52:77:9b:f0 RSSI=-69
07-12 15:28:46.186 955-1263/? E/WifiStateMachine﹕ [1,436,695,126,196 ms] noteScanStartWorkSource{10034} uid 10034
07-12 15:28:46.206 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_ENGINE_STATE_IND_V02
07-12 15:28:46.226 955-1006/? E/Sensors﹕ Sensor : Meta event
07-12 15:28:47.066 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:47.726 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:47.786 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:48.366 955-1263/? E/WifiStateMachine﹕ [1,436,695,128,369 ms] noteScanEnd WorkSource{10034}
07-12 15:28:48.366 955-1263/? E/WifiStateMachine﹕ wifi setScanResults statecom.android.server.wifi.WifiStateMachine$ConnectedState@3f98adf2 sup_state=COMPLETED debouncing=false
07-12 15:28:48.406 955-955/? E/LocSvc_flp﹕ I/===> int flp_inject_location(FlpLocation*) line 222
07-12 15:28:48.716 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:48.776 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:48.956 337-853/? E/audio_hw_primary﹕ [MAXIM] setDSM_tx_Control()....dsm_enable : 0, dsm_opened : 1, adev->mode : 0
07-12 15:28:48.976 337-853/? E/AudioFlinger﹕ releaseWakeLock_l() AudioOut_4
07-12 15:28:49.726 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:49.786 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:50.726 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:50.786 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:51.226 955-1263/? E/WifiStateMachine﹕ WifiStateMachine CMD_START_SCAN source 10034 txSuccessRate=8.99 rxSuccessRate=2.22 targetRoamBSSID=90:f6:52:77:9b:f0 RSSI=-71
07-12 15:28:51.226 955-1263/? E/WifiStateMachine﹕ [1,436,695,131,232 ms] noteScanStartWorkSource{10034} uid 10034
07-12 15:28:51.236 955-1006/? E/Sensors﹕ Sensor : Meta event
07-12 15:28:51.726 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:51.796 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:52.706 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:52.766 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:53.406 955-1263/? E/WifiStateMachine﹕ [1,436,695,133,409 ms] noteScanEnd WorkSource{10034}
07-12 15:28:53.426 955-1263/? E/WifiStateMachine﹕ wifi setScanResults statecom.android.server.wifi.WifiStateMachine$ConnectedState@3f98adf2 sup_state=COMPLETED debouncing=false
07-12 15:28:53.536 955-955/? E/LocSvc_flp﹕ I/===> int flp_inject_location(FlpLocation*) line 222
07-12 15:28:53.716 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:53.776 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:53.936 1967-2265/? E/Places﹕ e.a:898: GLS returned HTTP response code 500
07-12 15:28:54.376 1967-2265/? E/Places﹕ e.a:898: GLS returned HTTP response code 500
07-12 15:28:54.726 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:54.786 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:55.726 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_GNSS_SV_INFO_IND_V02
07-12 15:28:55.786 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:55.806 337-853/? E/AudioFlinger﹕ AudioFlinger acquireWakeLock
07-12 15:28:55.816 337-853/? E/AudioFlinger﹕ acquireWakeLock_l() AudioOut_4 status 0
07-12 15:28:55.826 337-852/? E/msm8974_platform﹕ platform_send_audio_calibration: sending audio calibration for snd_device(2) acdb_id(15)
07-12 15:28:55.856 337-852/? E/audio_hw_primary﹕ [MAXIM] setDSM_tx_Control()....dsm_enable : 1, dsm_opened : 0, adev->snd_card : 0, device_id : 1, adev->mode : 0
07-12 15:28:55.946 955-1004/? E/LocSvc_utils_cfg﹕ W/loc_read_sec_gps_conf: no secgps conf file, using defaults
07-12 15:28:55.966 955-1537/? E/LocSvc_ApiV02﹕ I/virtual loc_api_adapter_err LocApiV02::startFix(const LocPosMode&):434]: position_mode=0.
07-12 15:28:55.996 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalRespCb(locClientHandleType, uint32_t, locClientRespIndUnionType, void*) line 125 QMI_LOC_SET_OPERATION_MODE_REQ_V02
07-12 15:28:56.236 955-1263/? E/WifiStateMachine﹕ WifiStateMachine CMD_START_SCAN source 10034 txSuccessRate=29.50 rxSuccessRate=22.11 targetRoamBSSID=90:f6:52:77:9b:f0 RSSI=-75
07-12 15:28:56.236 955-1263/? E/WifiStateMachine﹕ [1,436,695,136,247 ms] noteScanStartWorkSource{10034} uid 10034
07-12 15:28:56.256 955-1006/? E/Sensors﹕ Sensor : Meta event
07-12 15:28:56.346 1967-1978/? E/DataBuffer﹕ Internal data leak within a DataBuffer object detected! Be sure to explicitly call release() on all DataBuffer extending objects when you are done with them. (s{status=Status{statusCode=SUCCESS, resolution=null}, attributions=null})
07-12 15:28:56.356 1967-1978/? E/DataBuffer﹕ Internal data leak within a DataBuffer object detected! Be sure to explicitly call release() on all DataBuffer extending objects when you are done with them. (internal object: com.google.android.gms.common.data.DataHolder@342c61ce)
07-12 15:28:56.356 1967-1978/? E/DataBuffer﹕ Internal data leak within a DataBuffer object detected! Be sure to explicitly call release() on all DataBuffer extending objects when you are done with them. (s{status=Status{statusCode=SUCCESS, resolution=null}, attributions=null})
07-12 15:28:56.366 1967-1978/? E/DataBuffer﹕ Internal data leak within a DataBuffer object detected! Be sure to explicitly call release() on all DataBuffer extending objects when you are done with them. (internal object: com.google.android.gms.common.data.DataHolder@300698ef)
07-12 15:28:56.426 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_POSITION_REPORT_IND_V02
07-12 15:28:56.436 955-1703/? E/LocSvc_ApiV02﹕ I/<--- void globalEventCb(locClientHandleType, uint32_t, locClientEventIndUnionType, void*) line 99 QMI_LOC_EVENT_ENGINE_STATE_IND_V02
07-12 15:28:57.806 955-970/? E/PersonaManagerService﹕ inState(): stateMachine is null !!
07-12 15:28:57.846 2399-2655/com.example.akshay.myapplication E/Resources﹕ RunTimeException
android.content.res.Resources$NotFoundException: Resource ID #0x7f020278
at android.content.res.Resources.getValue(Resources.java:2345)
at android.content.res.Resources.startRC(Resources.java:1059)
at android.app.ActivityThread$mRunnable.run(ActivityThread.java:2527)
at java.lang.Thread.run(Thread.java:818)
07-12 15:28:58.206 2399-2399/com.example.akshay.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.akshay.myapplication, PID: 2399
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.akshay.myapplication/com.example.akshay.myapplication.showInMaps}: java.lang.NullPointerException: Attempt to invoke virtual method 'double android.os.Bundle.getDouble(java.lang.String)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2712)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2777)
at android.app.ActivityThread.access$900(ActivityThread.java:179)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1462)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5972)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'double android.os.Bundle.getDouble(java.lang.String)' on a null object reference
at com.example.akshay.myapplication.showInMaps.onCreate(showInMaps.java:32)
at android.app.Activity.performCreate(Activity.java:6289)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2777)
at android.app.ActivityThread.access$900(ActivityThread.java:179)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1462)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5972)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
07-12 15:28:58.396 955-1263/? E/WifiStateMachine﹕ [1,436,695,138,404 ms] noteScanEnd WorkSource{10034}
07-12 15:28:58.396 955-1263/? E/WifiStateMachine﹕ wifi setScanResults statecom.android.server.wifi.WifiStateMachine$ConnectedState@3f98adf2 sup_state=COMPLETED debouncing=false
07-12 15:28:58.416 955-955/? E/LocSvc_flp﹕ I/===> int flp_inject_location(FlpLocation*) line 222
07-12 15:28:58.526 955-2678/? E/android.os.Debug﹕ !@Dumpstate > sdumpstate -k -t -z -d -o /data/log/dumpstate_app_error
07-12 15:28:59.586 1967-2265/? E/Places﹕ e.a:898: GLS returned HTTP response code 500
07-12 15:29:01.016 955-1005/? E/ViewRootImpl﹕ sendUserActionEvent() mView == null
07-12 15:29:01.026 955-1296/? E/OpenGLRenderer﹕ SFEffectCache:clear(), mSize = 0
07-12 15:29:01.306 955-1006/? E/Sensors﹕ Sensor : Meta event
07-12 15:29:01.376 1967-2265/? E/Places﹕ e.a:898: GLS returned HTTP response code 500
答案 0 :(得分：3)
在showInMaps活动的onCreate方法中，你不应该说
Intent gotIntent = new Intent();
你应该说
Intent gotIntent = getIntent();
getIntent（）将获得启动此活动的Intent，这就是持有所有额外内容的意图。当你说新的Intent（）时，根本就没有额外的东西，因此当你说
时会出现NullPointerExceptionlat = gotIntent.getExtras().getDouble("Lat");