I posted my code below my application shows no errors int eh debug menu, when I run it logcat shows one error I posted it below. When I try to run the app on my phone it closes and stops responding and im not sure why. I was following an online tutorial and did it exactly how it said. Please help.
10-07 14:50:02.901: I/Process(11653): Sending signal. PID: 11653 SIG: 9
10-07 14:50:06.124: W/dalvikvm(11801): VFY: unable to resolve static field 1346 (MapAttrs) in Lcom/google/android/gms/R$styleable;
10-07 14:50:06.124: D/dalvikvm(11801): VFY: replacing opcode 0x62 at 0x000e
10-07 14:50:06.134: D/AndroidRuntime(11801): Shutting down VM
10-07 14:50:06.134: W/dalvikvm(11801): threadid=1: thread exiting with uncaught exception (group=0x4129bac8)
10-07 14:50:06.134: E/AndroidRuntime(11801): FATAL EXCEPTION: main
10-07 14:50:06.134: E/AndroidRuntime(11801): java.lang.NoClassDefFoundError: com.google.android.gms.R$styleable
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.google.android.gms.maps.GoogleMapOptions.createFromAttributes(Unknown Source)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.google.android.gms.maps.SupportMapFragment.onInflate(Unknown Source)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:284)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:682)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:327)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.Activity.setContentView(Activity.java:1928)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.example.gloc.MainActivity.onCreate(MainActivity.java:30)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.Activity.performCreate(Activity.java:5250)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread.access$700(ActivityThread.java:152)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.os.Handler.dispatchMessage(Handler.java:99)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.os.Looper.loop(Looper.java:137)
10-07 14:50:06.134: E/AndroidRuntime(11801): at android.app.ActivityThread.main(ActivityThread.java:5328)
10-07 14:50:06.134: E/AndroidRuntime(11801): at java.lang.reflect.Method.invokeNative(Native Method)
10-07 14:50:06.134: E/AndroidRuntime(11801): at java.lang.reflect.Method.invoke(Method.java:511)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
10-07 14:50:06.134: E/AndroidRuntime(11801): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
10-07 14:50:06.134: E/AndroidRuntime(11801): at dalvik.system.NativeStart.main(Native Method)
MainActivity.java
package com.example.gloc;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
public class MainActivity extends FragmentActivity implements LocationListener {
GoogleMap googleMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
// Showing status
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
int requestCode = 10;
//Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
//dialog.show();
}else { // Google Play Services are available
// Getting reference to the SupportMapFragment of activity_main.xml
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
// Getting GoogleMap object from the fragment
googleMap = fm.getMap();
// Enabling MyLocation Layer of Google Map
googleMap.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
}
}
#Override
public void onLocationChanged(Location location) {
TextView tvLocation = (TextView) findViewById(R.id.tv_location);
// Getting latitude of the current location
double latitude = location.getLatitude();
// Getting longitude of the current location
double longitude = location.getLongitude();
// Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude);
// Showing the current location in Google Map
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
// Zoom in the Google Map
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
// Setting latitude and longitude in the TextView tv_location
tvLocation.setText("Latitude:" + latitude + ", Longitude:"+ longitude );
}
#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
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Layout
<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" >
<TextView
android:id="#+id/tv_location"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/tv_location"
class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.gloc"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="12"
android:targetSdkVersion="18" />
<permission
android:name="in.wptrafficanalyzer.locationingooglemapv2.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<uses-permission android:name="in.wptrafficanalyzer.locationingooglemapv2.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"/>
<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="IEARASEDTHSITOHIDEIT"/>
<activity
android:name="com.example.gloc.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>
</application>
</manifest>
You can't change the map options in onCreate, as it has not yet been instantiated. Try doing all of the stuff in OnLocationChanged to your GoogleMap object in onResume() instead of onCreate().
Related
Hello Im new to programming and the android platform and Im developing an app using the Google Maps Api v2 and location services using Android Studio 1.02.Basically when someone launches the app, it will instantly zoom on its users current location and im encountering some weird problems on this.And By weird I mean it worked after I rad it on my device multiple times but after 2 days ( while i was out f town) I ran it again the app crashed on launch and this error apeared:
Is there a way to fix this ?
Also how do you manage to put a actionBar in android studio 1.02 because I can`t figure a way to do it.
The Logcat:
02-07 14:15:12.350 21921-21921/com.nanocat.viapp E/AndroidRuntime﹕
FATAL EXCEPTION: main
Process: com.nanocat.viapp, PID: 21921
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nanocat.viapp/com.nanocat.viapp.MapsActivity}:
java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
at android.app.ActivityThread.access$900(ActivityThread.java:161)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5356)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.nanocat.viapp.MapsActivity.setUpMap(MapsActivity.java:56)
at com.nanocat.viapp.MapsActivity.setUpMapIfNeeded(MapsActivity.java:46)
at com.nanocat.viapp.MapsActivity.onCreate(MapsActivity.java:28)
at android.app.Activity.performCreate(Activity.java:5426)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
at android.app.ActivityThread.access$900(ActivityThread.java:161)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5356)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
My MapsActivity class:
package com.nanocat.viapp;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
public class MapsActivity extends FragmentActivity {
private GoogleMap mMap;
double latitude;
double longitude;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
if (mMap != null) {
setUpMap();
}
}
}
public void setUpMap() {
Criteria criteria = new Criteria();
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
String provider = locationManager.getBestProvider(criteria, true);
Location myLocation = locationManager.getLastKnownLocation(provider);
latitude = myLocation.getLatitude();
longitude = myLocation.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(latLng)
.tilt(60)
.zoom(17)
.build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
}
My Manifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nanocat.viapp" >
<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" />
<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.gms.version"
android:value="#integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="#string/google_maps_key" />
<activity
android:name=".MapsActivity"
android:label="#string/title_activity_maps" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
And my Layout :
<fragment
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:id="#+id/map"
tools:context=".MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment" />
The problem is due of
Location myLocation = locationManager.getLastKnownLocation(provider);
getLastKnowLocation returns null if a location has not been yet acquired. So you should at least check against null Location objects
I'm trying to develop a simple 2D game using libgdx in Android Studio (0.8.14), but at this point (just with a splash and an empty menu) I'm getting an error, with this LogCat output, when I launch the app (I'm testing on device, Sony Xperia Z1):
12-02 18:01:52.146 24248-24248/com.ak.thesoccerball.android D/dalvikvm﹕ Late-enabling CheckJNI
12-02 18:01:52.196 24248-24248/com.ak.thesoccerball.android W/ActivityThread﹕ Application com.ak.thesoccerball.android can be debugged on port 8100...
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android D/dalvikvm﹕ Trying to load lib /data/app-lib/com.ak.thesoccerball.android-1/libgdx.so 0x447c06f0
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android D/dalvikvm﹕ Added shared lib /data/app-lib/com.ak.thesoccerball.android-1/libgdx.so 0x447c06f0
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android D/dalvikvm﹕ No JNI_OnLoad found in /data/app-lib/com.ak.thesoccerball.android-1/libgdx.so 0x447c06f0, skipping init
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android W/dalvikvm﹕ Exception Ljava/lang/NullPointerException; thrown while initializing Lcom/ak/thesoccerball/AKGame;
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android D/AndroidRuntime﹕ Shutting down VM
12-02 18:01:52.246 24248-24248/com.ak.thesoccerball.android W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41618d88)
12-02 18:01:52.256 24248-24248/com.ak.thesoccerball.android E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.ak.thesoccerball.android, PID: 24248
java.lang.ExceptionInInitializerError
at com.ak.thesoccerball.android.AndroidLauncher.onCreate(AndroidLauncher.java:17)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5135)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.ak.thesoccerball.AKGame.<clinit>(AKGame.java:9)
at com.ak.thesoccerball.android.AndroidLauncher.onCreate(AndroidLauncher.java:17)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5135)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
at dalvik.system.NativeStart.main(Native Method)
The classes involved are as follows:
- AndroidLauncher.java
package com.ak.thesoccerball.android;
import android.os.Bundle;
import com.badlogic.gdx.backends.android.AndroidApplication;
import com.badlogic.gdx.backends.android.AndroidApplicationConfiguration;
import com.ak.thesoccerball.AKGame;
public class AndroidLauncher extends AndroidApplication {
#Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
config.useAccelerometer = false;
config.useCompass = false;
initialize(new AKGame(), config);
}
}
AKGame.java
package com.ak.thesoccerball;
import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
public class AKGame extends Game {
public static final int WIDTH = Gdx.graphics.getWidth();
public static final int HEIGHT = Gdx.graphics.getHeight();
public SpriteBatch batch;
#Override
public void create() {
batch = new SpriteBatch();
setScreen(new SplashScreen(this));
}
public void render() {
super.render(); //important!
}
public void dispose() {
batch.dispose();
}
}
And here's the AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ak.thesoccerball.android"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" />
<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/GdxTheme" >
<activity
android:name="com.ak.thesoccerball.android.AndroidLauncher"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
What am I missing so hard?
Move this code:
public static final int WIDTH = Gdx.graphics.getWidth();
public static final int HEIGHT = Gdx.graphics.getHeight();
into the create() method, for example:
#Override
public void create() {
WIDTH = Gdx.graphics.getWidth();
HEIGHT = Gdx.graphics.getHeight();
//..
}
The thing is that before the create method gets called the Gdx is still null and cannot be used yet.
I'm pretty new to Android development so I'm sure this is going to turn out to be something stupid that I've missed, but I have two activities: StartScreen and Map. StartScreen is just simple text and a button, which is supposed to then take you to the Map activity.
I've already tried reducing the Map activity down to almost nothing, and I'm sure it's nothing in there that's causing the error, but I just can't figure out what is.
This is the logcat output for the error, it happens when I press the button linking the two activities:
04-28 20:40:24.097: E/AndroidRuntime(13458): FATAL EXCEPTION: main
04-28 20:40:24.097: E/AndroidRuntime(13458): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.rr.freespace/com.rr.freespace.Map}: java.lang.NullPointerException
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.app.ActivityThread.access$600(ActivityThread.java:139)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.os.Handler.dispatchMessage(Handler.java:99)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.os.Looper.loop(Looper.java:154)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.app.ActivityThread.main(ActivityThread.java:4945)
04-28 20:40:24.097: E/AndroidRuntime(13458): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 20:40:24.097: E/AndroidRuntime(13458): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 20:40:24.097: E/AndroidRuntime(13458): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-28 20:40:24.097: E/AndroidRuntime(13458): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-28 20:40:24.097: E/AndroidRuntime(13458): at dalvik.system.NativeStart.main(Native Method)
04-28 20:40:24.097: E/AndroidRuntime(13458): Caused by: java.lang.NullPointerException
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.content.ContextWrapper.getPackageName(ContextWrapper.java:127)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.content.ComponentName.<init>(ComponentName.java:75)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.content.Intent.<init>(Intent.java:3475)
04-28 20:40:24.097: E/AndroidRuntime(13458): at com.rr.freespace.Map.<init>(Map.java:12)
04-28 20:40:24.097: E/AndroidRuntime(13458): at java.lang.Class.newInstanceImpl(Native Method)
04-28 20:40:24.097: E/AndroidRuntime(13458): at java.lang.Class.newInstance(Class.java:1319)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.app.Instrumentation.newActivity(Instrumentation.java:1039)
04-28 20:40:24.097: E/AndroidRuntime(13458): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2101)
Here's my StartScreen.java:
package com.rr.freespace;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
public class StartScreen extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start_screen);
}
public void doIt(View view) { // Do something in response to button }
Intent intent = new Intent(this, Map.class);
startActivity(intent);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.start_screen, menu);
return true;
}
}
The activity_start_screen.xml layout file:
<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=".StartScreen" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="180dp"
android:text="#string/hometext2"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:layout_margin="20dp"
android:text="#string/doit"
android:onClick="doIt" />
</RelativeLayout>
And finally, the manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rr.freespace"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="17" />
<permission
android:name="com.example.mapdemo.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="com.rr.freespace.permission.MAPS_RECEIVE"/>
<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-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">
<uses-library android:name="com.google.android.maps" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyBaoeVjdRY312vJ5KMLXxmzpKHhPiYqASo"/>
<activity
android:name="com.rr.freespace.StartScreen"
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="com.rr.freespace.Map"
android:label="#string/app_name" >
</activity>
</application>
</manifest>
I hope someone can figure out what's going on here, because I can't! Cheers!
EDIT: here's the map.java code, there may be more errors in here that I haven't got to yet, because I hacked most of this together yesterday before I had access to an android device:
package com.rr.freespace;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.view.Menu;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMapOptions;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
public class Map extends Activity {
final Context context = this;
Intent goback = new Intent(this, StartScreen.class);
protected LocationManager locationManager;
protected LocationListener listener;
private GoogleMap mMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
final boolean gpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (!gpsEnabled) {
AlertDialog.Builder gpssettings = new AlertDialog.Builder(context);
gpssettings.setMessage(R.string.gpstext)
.setTitle(R.string.gpstitle);
gpssettings.setPositiveButton(R.string.gpsok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
enableLocationSettings();
}
});
gpssettings.setNegativeButton(R.string.gpscancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
startActivity(goback);
}
});
}
mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
GoogleMapOptions options = new GoogleMapOptions();
options.mapType(GoogleMap.MAP_TYPE_NORMAL)
.compassEnabled(false)
.rotateGesturesEnabled(false)
.tiltGesturesEnabled(false);
//Get GPS data
final LocationListener listener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
// A new location update is received. Do something useful with it. Update the UI with
// the location update.
final LatLng position = new LatLng(location.getLatitude(),location.getLongitude());
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(position, 15));
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
1000, // 10-second interval.
5, // 5 meters.
listener);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.map, menu);
return true;
}
private void enableLocationSettings() {
Intent settingsIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(settingsIntent);
}
protected void onStop() {
super.onStop();
locationManager.removeUpdates(listener);
}
}
Intent goback = new Intent(this, StartScreen.class);
that causes an issue.
You can't use "this" here, best to create intents just before using them.
But if You would like to have it as soon as possible do it in onCreate.
It always crashes when ran on my device i've tried so many thing but alas im a beginner at android
The Place section which will just show you where you are on the map and you co-ordinates doesnt seem to work for me at all.
Here's My Manifest Code
After Editing Code as Suggested still doesnt work heres the log cat
Log Cat
04-02 03:45:19.025: W/dalvikvm(1102): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-02 03:45:19.104: E/AndroidRuntime(1102): FATAL EXCEPTION: main
04-02 03:45:19.104: E/AndroidRuntime(1102): java.lang.RuntimeException: Unable to start activityComponentInfo{com.hangoverhelper/com.hangoverhelper.Place}: java.lang.NullPointerException
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.os.Handler.dispatchMessage(Handler.java:99)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.os.Looper.loop(Looper.java:137)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-02 03:45:19.104: E/AndroidRuntime(1102): at java.lang.reflect.Method.invokeNative(Native Method)
04-02 03:45:19.104: E/AndroidRuntime(1102): at java.lang.reflect.Method.invoke(Method.java:511)
04-02 03:45:19.104: E/AndroidRuntime(1102): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-02 03:45:19.104: E/AndroidRuntime(1102): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-02 03:45:19.104: E/AndroidRuntime(1102): at dalvik.system.NativeStart.main(Native Method)
04-02 03:45:19.104: E/AndroidRuntime(1102): Caused by: java.lang.NullPointerException
04-02 03:45:19.104: E/AndroidRuntime(1102): at com.hangoverhelper.Place.onCreate(Place.java:42)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.app.Activity.performCreate(Activity.java:5104)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-02 03:45:19.104: E/AndroidRuntime(1102): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-02 03:45:19.104: E/AndroidRuntime(1102): ... 11 more
Place.java
package com.hangoverhelper;
import com.hangoverhelper.R;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.LocationSource;
import com.google.android.gms.maps.MapFragment;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.FragmentManager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
public class Place extends Activity
implements LocationSource, LocationListener{
final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;
TextView tvLocInfo;
LocationManager myLocationManager = null;
OnLocationChangedListener myLocationListener = null;
Criteria myCriteria;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_place);
tvLocInfo = (TextView)findViewById(R.id.locinfo);
FragmentManager myFragmentManager = getFragmentManager();
MapFragment myMapFragment
= (MapFragment)myFragmentManager.findFragmentById(R.id.map);
myMap = myMapFragment.getMap();
myMap.setMyLocationEnabled(true);
myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
myCriteria = new Criteria();
myCriteria.setAccuracy(Criteria.ACCURACY_FINE);
myLocationManager = (LocationManager)getSystemService(LOCATION_SERVICE);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.place, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int itemId = item.getItemId();
if (itemId == R.id.menu_legalnotices) {
String LicenseInfo = GooglePlayServicesUtil.getOpenSourceSoftwareLicenseInfo(
getApplicationContext());
AlertDialog.Builder LicenseDialog = new AlertDialog.Builder(Place.this);
LicenseDialog.setTitle("Legal Notices");
LicenseDialog.setMessage(LicenseInfo);
LicenseDialog.show();
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onResume() {
super.onResume();
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if (resultCode == ConnectionResult.SUCCESS){
Toast.makeText(getApplicationContext(),
"isGooglePlayServicesAvailable SUCCESS",
Toast.LENGTH_LONG).show();
//Register for location updates using a Criteria, and a callback on the specified looper thread.
myLocationManager.requestLocationUpdates(
0L, //minTime
0.0f, //minDistance
myCriteria, //criteria
this, //listener
null); //looper
//Replaces the location source of the my-location layer.
myMap.setLocationSource(this);
}else{
GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices);
}
}
#Override
protected void onPause() {
myMap.setLocationSource(null);
myLocationManager.removeUpdates(this);
super.onPause();
}
#Override
public void activate(OnLocationChangedListener listener) {
myLocationListener = listener;
}
#Override
public void deactivate() {
myLocationListener = null;
}
#Override
public void onLocationChanged(Location location) {
if (myLocationListener != null) {
myLocationListener.onLocationChanged(location);
double lat = location.getLatitude();
double lon = location.getLongitude();
tvLocInfo.setText(
"lat: " + lat + "\n" +
"lon: " + lon);
}
}
#Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.hangoverhelper"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="17" />
<permission
android:name="com.hangoverhelper.permission.MAPS_RECEIVE"
android:protectionLevel="signature"></permission>
<uses-permission
android:name="com.hangoverhelper.permission.MAPS_RECEIVE"/>
<uses-permission
android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission
android:name="android.permission.INTERNET"/>
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<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:logo="#drawable/ic_launcher"
android:theme="#style/AppTheme" >
<activity
android:name="com.hangoverhelper.SplashActivity"
android:label="#string/title_activity_splash"
android:theme="#style/Theme.Splash" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.hangoverhelper.MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
</activity>
<activity
android:name="com.hangoverhelper.Place"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/local_title"
android:theme="#style/AppTheme" >
</activity>
<activity
android:name="com.hangoverhelper.Pill"
android:label="#string/pills_title" >
</activity>
<activity
android:name="com.hangoverhelper.Food"
android:label="#string/food_title" >
</activity>
<activity
android:name="com.hangoverhelper.Coffee"
android:label="#string/coffee_title" >
</activity>
<activity
android:name="com.hangoverhelper.Home"
android:label="#string/home_title" >
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyBkFR4cjuUf2rw8MfLBrWS8iaS2-Th5XA4"/>
</application>
</manifest>
*activity_place.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:orientation="vertical"
tools:context=".Place" >
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment"
tools:layout="#layout/custom_info_contents" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#A0FFFFFF" >
<TextView
android:id="#+id/locinfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/local" />
</LinearLayout>
</RelativeLayout>
You have some problems in your code:
1. Remove this line:
<uses-library android:name="com.google.android.maps" />
from the manifest file it's for Google Map API V1.
2. Place this peace of code at the bottom of your application tag:
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="My API CODE"/>
with your generated key for Google Map for Android API V2.
3. The package name in those permissions:
<permission
android:name="com.example.androidmapsv2.permission.MAPS_RECEIVE"
android:protectionLevel="signature"></permission>
<uses-permission
android:name="com.example.androidmapsv2.permission.MAPS_RECEIVE"/>
doens't match the package name specified for your application (it should):
package="com.hangoverhelper"
I've been reading up examples on how to do this, trying to piece together a functioning example from posts on this site and others. I'm sure I'm missing something small, but as a novice to Java, I could use some assistance.
I'm merely trying to create a small example, derived from the automated hello world generated when creating a new project in Eclipse. All I want to do is be able to store a few global variables in a subclass, then reference those values in my main activity. Unfortunately, every time I try to run the app, it crashes "Unfortunately, GeneralTest1 has stopped", and the log cat error is not very helpful.
Quick overview:
GlobalVars class extends Application
In the manifest, android:name has been added to reference the additional GlobalVars class
Within my main activity, I'm initializing the global vars class with getApplicationContext()
Here is everything I've got; any help would be much appreciated!
MainActivity.java
package com.example.generaltest1;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
GlobalVars myVars = ((GlobalVars)getApplicationContext());
TextView myText = (TextView) findViewById(R.id.myText);
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myText.setText(myVars.getMyString());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
GlobalVars.java
package com.example.generaltest1;
import android.app.Application;
public class GlobalVars extends Application {
String myString = "Some Text";
public String getMyString() {
return myString;
}
public String setMyString(String string) {
this.myString = string;
return myString;
}
}
activity_main.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" >
<TextView
android:id="#+id/myText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/hello_world"
tools:context=".MainActivity" />
</RelativeLayout>
strings.xml
<resources>
<string name="app_name">GeneralTest1</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
</resources>
GeneralTest1 Manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.generaltest1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" android:name="GlobalVars">
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Log Cat
08-14 09:53:05.546: E/Trace(620): error opening trace file: No such file or directory (2)
08-14 09:53:05.656: D/AndroidRuntime(620): Shutting down VM
08-14 09:53:05.656: W/dalvikvm(620): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
08-14 09:53:05.676: E/AndroidRuntime(620): FATAL EXCEPTION: main
08-14 09:53:05.676: E/AndroidRuntime(620): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.generaltest1/com.example.generaltest1.MainActivity}: java.lang.NullPointerException
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.access$600(ActivityThread.java:130)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.os.Handler.dispatchMessage(Handler.java:99)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.os.Looper.loop(Looper.java:137)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.main(ActivityThread.java:4745)
08-14 09:53:05.676: E/AndroidRuntime(620): at java.lang.reflect.Method.invokeNative(Native Method)
08-14 09:53:05.676: E/AndroidRuntime(620): at java.lang.reflect.Method.invoke(Method.java:511)
08-14 09:53:05.676: E/AndroidRuntime(620): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-14 09:53:05.676: E/AndroidRuntime(620): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-14 09:53:05.676: E/AndroidRuntime(620): at dalvik.system.NativeStart.main(Native Method)
08-14 09:53:05.676: E/AndroidRuntime(620): Caused by: java.lang.NullPointerException
08-14 09:53:05.676: E/AndroidRuntime(620): at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:101)
08-14 09:53:05.676: E/AndroidRuntime(620): at com.example.generaltest1.MainActivity.<init>(MainActivity.java:10)
08-14 09:53:05.676: E/AndroidRuntime(620): at java.lang.Class.newInstanceImpl(Native Method)
08-14 09:53:05.676: E/AndroidRuntime(620): at java.lang.Class.newInstance(Class.java:1319)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
08-14 09:53:05.676: E/AndroidRuntime(620): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
08-14 09:53:05.676: E/AndroidRuntime(620): ... 11 more
You are calling getApplicationContext() in your class definition, which is too early in the activity lifetime and results in a nullpointer exception. Move the assignments to your onCreate() function and it should work as expected.
Please check this article about activities and their lifecycle :
http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle
Your activity should look like this:
public class MainActivity extends Activity {
GlobalVars myVars;
TextView myText;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myVars = ((GlobalVars)getApplication());
myText = (TextView) findViewById(R.id.myText);
myText.setText(myVars.getMyString());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Add these lines in oncreate()..
GlobalVars myVars = ((GlobalVars)getApplicationContext());
TextView myText = (TextView) findViewById(R.id.myText);