我正在开发一个应用程序，因为我想在打开通知时显示地图，我收到了通知，但是当我打开通知时没有用那个lat长值打开地图。
GCMIntent服务类
public class GcmIntentService extends IntentService{
Context context;
public static int notify_no=0;
//System.currentTimeMillis();
private NotificationManager mNotificationManager;
NotificationCompat.Builder builder;
public static final String TAG = "GCM NOTIFICATION";
public GcmIntentService() {
super("GcmIntentService");
// TODO Auto-generated constructor stub
}
@Override
protected void onHandleIntent(Intent intent) {
// TODO Auto-generated method stub
Bundle extras = intent.getExtras();
String msg = intent.getStringExtra("message");
GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
String messageType = gcm.getMessageType(intent);
if (!extras.isEmpty()) {
if (GoogleCloudMessaging.
MESSAGE_TYPE_SEND_ERROR.equals(messageType)) {
// sendNotification(RegIdDTO.REG_ID,"Send error: " + extras.toString());
sendNotification(this,msg);
} else if (GoogleCloudMessaging.
MESSAGE_TYPE_DELETED.equals(messageType)) {
// sendNotification(RegIdDTO.REG_ID,"Deleted messages on server: " +
// extras.toString());
sendNotification(this,msg);
// If it's a regular GCM message, do some work.
} else if (GoogleCloudMessaging.
MESSAGE_TYPE_MESSAGE.equals(messageType)) {
// This loop represents the service doing some work.
for (int i=0; i<5; i++) {
Log.i(TAG, "Working... " + (i+1)
+ "/5 @ " + SystemClock.elapsedRealtime());
try {
Thread.sleep(500);
} catch (InterruptedException e) {
}
}
Log.i(TAG, "Completed work @ " + SystemClock.elapsedRealtime());
// Post notification of received message.
//sendNotification("Received: " + extras.toString());
// sendNotification(RegIdDTO.REG_ID,msg);
sendNotification(this,msg);
Log.i(TAG, "Received: " + extras.toString());
}
}
GcmBroadcastReceiver.completeWakefulIntent(intent);
}
private static void sendNotification(Context context,String message) {
int icon = R.drawable.ic_stat_gcm;
long when = System.currentTimeMillis();
NotificationCompat.Builder nBuilder;
Uri alarmSound = RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
nBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("header")
.setLights(Color.BLUE, 500, 500).setContentText(message)
.setAutoCancel(true).setTicker("Notification from Traffic")
.setVibrate(new long[] { 100, 250, 100, 250, 100, 250 })
.setSound(alarmSound);
String consumerid = null;
Integer position = null;
// write your click event here
Intent resultIntent = new Intent(context, ShowMapActivity.class);
resultIntent.putExtra("message", message);
// resultIntent.setData(Uri.parse("content://"+when));
PendingIntent resultPendingIntent = PendingIntent.getActivity(context,
notify_no, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);
// Show the max number of notifications here
if (notify_no < 9) {
notify_no = notify_no + 1;
} else {
notify_no = 0;
}
nBuilder.setContentIntent(resultPendingIntent);
NotificationManager nNotifyMgr = (NotificationManager) context
.getSystemService(context.NOTIFICATION_SERVICE);
nNotifyMgr.notify(notify_no + 2, nBuilder.build());
}
}
ShowMap类
public class ShowMapActivity extends FragmentActivity implements LocationListener {
GoogleMap _googleMap;
LatLng myPosition;
LocationManager locationManger;
TextView addressTextView,cTimeTextView;
JSONObject json;
GcmIntentService serv;
Context mContext;
Intent noticeIntent = getIntent();
String lat;
String lng;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_map);
//addressTextView = (TextView)findViewById(R.id.addressId);
//cTimeTextView = (TextView)findViewById(R.id.ctimeId);
String message = noticeIntent.getExtras().getString("message");
try {
json = new JSONObject(message);
lat = json.getString("lat");
Log.e("LLOONNGG", ""+lat);
lng = json.getString("lng");
Log.e("LLOONNGG", ""+lng);
String adr = json.getString("address");
addressTextView.setText(adr);
String ctime = json.getString("ctime");
cTimeTextView.setText(ctime);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
_googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(
R.id.map)).getMap();
LocationManager service = (LocationManager)getSystemService(LOCATION_SERVICE);
boolean enableGPS = service.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean enableWiFi= service.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(!enableGPS || !enableWiFi){
Toast.makeText(ShowMapActivity.this, "GPS signal not found", Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
locationManger = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = service.getBestProvider(criteria, true);
service.requestLocationUpdates(provider, 0, 0, this);
if(_googleMap==null){
Toast.makeText(getApplicationContext(), "Google Map Not Available", Toast.LENGTH_LONG).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.show_map, menu);
return true;
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
//locationManger.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
_googleMap.clear();
ArrayList<HashMap<String, String>> arl = (ArrayList<HashMap<String, String>>)
getIntent().getSerializableExtra("arrayList");
/*if(location!=null){
double latitude = location.getLatitude();
double langitude = location.getLongitude();
LatLng latlang = new LatLng(latitude, langitude);
//LatLngBounds curScreen =
_googleMap.getProjection().getVisibleRegion().latLngBounds;
//curScreen.contains(latlang);
myPosition = new LatLng(latitude, langitude);
// Show only Current Location
_googleMap.moveCamera(CameraUpdateFactory.newLatLng(myPosition));
_googleMap.addMarker(new
MarkerOptions().position(myPosition).title("start"));
}*/
if ( !lat.trim().equals("") && !lng.trim().equals("") ) {
double Hlat = Double.parseDouble(lat.trim());
double Hlong= Double.parseDouble(lng.trim());
LatLng dabaseLocations =new LatLng(Hlat, Hlong);
Log.e("LLAATTAA", ""+Hlat);
Log.e("LLOONNGG", ""+Hlong);
// Show current location with database locations
_googleMap.moveCamera(CameraUpdateFactory.newLatLng(dabaseLocations));
_googleMap.addMarker(new
MarkerOptions().position(dabaseLocations).title("start"));
}
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
serv=new GcmIntentService();
//serv.CancelNotification(getApplicationContext());
}
}
我的Logcat
03-06 13:03:40.187: E/AndroidRuntime(18546): java.lang.RuntimeException: Unable to start activity
logcat的
ComponentInfo{com.technowellServices.traffic/com.technowellServices.traffic.ShowMapActivity}:
java.lang.NullPointerException
03-06 13:03:40.187: E/AndroidRuntime(18546): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1728)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1747)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
android.app.ActivityThread.access$1500(ActivityThread.java:155)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
android.os.Handler.dispatchMessage(Handler.java:130)
03-06 13:03:40.187: E/AndroidRuntime(18546): at android.os.Looper.loop(SourceFile:351)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
android.app.ActivityThread.main(ActivityThread.java:3814)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
java.lang.reflect.Method.invokeNative(Native Method)
03-06 13:03:40.187: E/AndroidRuntime(18546): at j
ava.lang.reflect.Method.invoke(Method.java:538)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:659)
03-06 13:03:40.187: E/AndroidRuntime(18546): at dalvik.system.NativeStart.main(Native
Method)
03-06 13:03:40.187: E/AndroidRuntime(18546): Caused by: java.lang.NullPointerException
03-06 13:03:40.187: E/AndroidRuntime(18546): at
com.technowellServices.traffic.ShowMapActivity.onCreate(ShowMapActivity.java:66)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1082)
03-06 13:03:40.187: E/AndroidRuntime(18546): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1692)
答案 0 :(得分：1)
你不能这称呼
Intent noticeIntent = getIntent();
在onCreate（）方法之前。
你应该把它放在 onCreate（）方法中。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_map);
Intent noticeIntent = getIntent();
// ...
}
从
更改此内容 String message = noticeIntent.getExtras().getString("message");
到
String message = noticeIntent.getStringExtras("message");
答案 1 :(得分：1)
您应该在noticeIntent中的onCreate(....)内创建ShowMapActivity
Intent noticeIntent = getIntent();
String message = noticeIntent.getStringExtras("message");