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I'm getting java.lang.ExceptionInInitializerError launching a libgdx game

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.

Android : java.lang.NullPointerException Unable to start Activity

I know that this question is asked a lot of time but the answer is always for a specific code.
So, i am creating a game in which i need to switch between activities and i have tried everything but always my logcat give me that error and emulator says that "Application have Stopped Working ". So please help me to find out the bug.
My code is:
MainActivity.java
package com.example.experiment;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView playG=(TextView)findViewById(R.id.playGame);
playG.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View arg0)
{
Intent i=new Intent(MainActivity.this,GameActivity.class);
startActivity(i);
}
});
}
}
GameActivity.java
package com.example.experiment;
import android.app.Activity;
import android.os.Bundle;
public class GameActivity extends Activity
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(new Game(this));
}
}
Game.java
package com.example.experiment;
import java.util.Random;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;
public class Game extends View
{
int i=0,j=0;
int hei=0,wid=0,div=0;
int MoUp=0,MoUpDo=0,Rd;
float TouchXU=0,TouchYU=0,TouchXD=0,TouchYD=0;
float CirX,CirY;
int Score=0;
boolean MoveUp=false,Move=false,NextObs=false;
Path Rpath=new Path();
Paint paint=new Paint();
String ScoreStr="";
Random Rand=new Random();
Activity act=new Activity();
GamEnd g=new GamEnd(getContext());
Context context1=act.getApplicationContext();
Intent intent=new Intent();
public Game(Context context)
{
super(context);
}
#Override
public void onDraw(Canvas canvas)
{
Rd=Rand.nextInt(10);
super.onDraw(canvas);
paint.setAntiAlias(true);
setBackgroundColor(Color.parseColor("#3E8E21"));
MainPath(canvas);
Obstacle1(canvas);
Ball(canvas);
Scores(canvas);
}
public void Ball(Canvas canvas)
{
CirX=getWidth()/2;
CirY=(getHeight()/2+getHeight()/4);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.BLUE);
paint.setStyle(Paint.Style.FILL);
if(i<9)
{
postInvalidateDelayed(40);
canvas.drawCircle(CirX, CirY+i, 30, paint);
i+=3;
Score+=10;
}
else if(MoveUp==true)
{
if(MoUp<200)
{
postInvalidateDelayed(30);
canvas.drawCircle(CirX, CirY+i-MoUp, 30, paint);
MoUp+=40;
Score+=10;
}
else
{
postInvalidateDelayed(25);
canvas.drawCircle(CirX, CirY+i-j+MoUpDo-MoUp, 30, paint);
MoUpDo+=40;
Score+=10;
if(MoUpDo==200)
{
MoUp=0;
MoUpDo=0;
MoveUp=false;
}
}
}
else
{
postInvalidateDelayed(40);
canvas.drawCircle(CirX, CirY+i-j, 30, paint);
j+=3;
Score+=10;
if(j==9)
{
i=0;
j=0;
}
}
if(hei>=CirY-15 && hei<=CirY+10 && MoveUp==false)
{
Toast.makeText(getContext(), "You Are Out", Toast.LENGTH_LONG).show();
Intent in=new Intent(getContext(),MainActivity.class);
act.startActivity(in);
}
}
public void MainPath(Canvas canvas)
{
paint.setColor(Color.parseColor("#EE874B"));
paint.setStyle(Paint.Style.FILL);
Rpath.moveTo(getWidth()/2-getWidth()/6,0);
Rpath.lineTo(getWidth()/2+getWidth()/6,0);
Rpath.lineTo(getWidth()/2+getWidth()/3,getHeight());
Rpath.lineTo(getWidth()/2-getWidth()/3,getHeight());
Rpath.lineTo(getWidth()/2-getWidth()/6,0);
canvas.drawPath(Rpath, paint);
Rpath.reset();
}
#Override
public boolean onTouchEvent(MotionEvent event)
{
switch(event.getAction())
{
case MotionEvent.ACTION_DOWN:
TouchXD=(float)event.getRawX();
TouchYD=(float)event.getRawY();
break;
case MotionEvent.ACTION_UP:
TouchXU=(float)event.getRawX();
TouchYU=(float)event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
Move=true;
break;
}
if(TouchYD>TouchYU && Move==true)
{
MoveUp=true;
Move=false;
}
return true;
}
public void Scores(Canvas canvas)
{
paint.setColor(Color.parseColor("#4CB028"));
paint.setTextSize(20);
paint.setTextSkewX((float) 0.1);
paint.setFakeBoldText(true);
ScoreStr=String.valueOf(Score);
canvas.drawText(ScoreStr, 10, 30, paint);
}
public void Obstacle1(Canvas canvas)
{
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(20);
canvas.drawLine(getWidth()/2-getWidth()/6-wid, hei, getWidth()/2+getWidth()/6+wid, hei, paint);
float heiDiv=getHeight()/40;
float widDiv=(getWidth()/3-getWidth()/6)/40;
wid+=widDiv;
hei+=heiDiv;
if(hei>=getHeight())
{
NextObs=true;
hei=0;
wid=0;
Obstacle1(canvas);
}
}
public void ShowEnd(Canvas canvas)
{
setBackgroundColor(Color.parseColor("#003366"));
canvas.drawColor(Color.BLACK);
}
}
My logcat
08-21 08:57:09.647: E/AndroidRuntime(1253): FATAL EXCEPTION: main
08-21 08:57:09.647: E/AndroidRuntime(1253): Process: com.example.experiment, PID: 1253
08-21 08:57:09.647: E/AndroidRuntime(1253): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.experiment/com.example.experiment.GameActivity}: java.lang.NullPointerException
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.app.ActivityThread.access$800(ActivityThread.java:135)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.os.Handler.dispatchMessage(Handler.java:102)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.os.Looper.loop(Looper.java:136)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.app.ActivityThread.main(ActivityThread.java:5017)
08-21 08:57:09.647: E/AndroidRuntime(1253): at java.lang.reflect.Method.invokeNative(Native Method)
08-21 08:57:09.647: E/AndroidRuntime(1253): at java.lang.reflect.Method.invoke(Method.java:515)
08-21 08:57:09.647: E/AndroidRuntime(1253): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-21 08:57:09.647: E/AndroidRuntime(1253): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-21 08:57:09.647: E/AndroidRuntime(1253): at dalvik.system.NativeStart.main(Native Method)
08-21 08:57:09.647: E/AndroidRuntime(1253): Caused by: java.lang.NullPointerException
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:109)
08-21 08:57:09.647: E/AndroidRuntime(1253): at com.example.experiment.Game.<init>(Game.java:31)
08-21 08:57:09.647: E/AndroidRuntime(1253): at com.example.experiment.GameActivity.onCreate(GameActivity.java:12)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.app.Activity.performCreate(Activity.java:5231)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-21 08:57:09.647: E/AndroidRuntime(1253): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
08-21 08:57:09.647: E/AndroidRuntime(1253): ... 11 more
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.experiment"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.experiment.MainActivity"
android:configChanges="orientation"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:theme="#android:style/Theme.NoTitleBar.Fullscreen" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.experiment.GameActivity"
android:label="#string/title_activity_game" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.experiment.GameActivity"/>
</activity>
</application>
</manifest>
Please friends help.
Thanks in advance.

Intent i = new Intent(MainActivity.this, GameActivity.class);
Should be declared after
super.onCreate();

Activity act=new Activity();
Never do this. An activity you instantiate yourself won't be good for anything, including a call to getApplicationContext(). Hence you get the NPE there.
Instead, pass a Context as a parameter to objects and methods that require it, such as your Game class constructor.

Unable to instantiate activity ComponentInfo .. java.lang.NullPointerException

I'm trying to run a simple app using volley and a custom header, it builds with no error, I'm running it directly in my smartphone, but when the app start I get the following log:
06-24 16:35:35.653 1380-1380/com.rep E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.rep, PID: 1380
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.rep/com.rep.app.principal.InicioActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2135)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2269)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5102)
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:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.content.ContextWrapper.getCacheDir(ContextWrapper.java:230)
at com.android.volley.toolbox.Volley.newRequestQueue(Volley.java:43)
at com.android.volley.toolbox.Volley.newRequestQueue(Volley.java:78)
at com.representemais.app.principal.InicioActivity.<init>(InicioActivity.java:86)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1208)
at android.app.Instrumentation.newActivity(Instrumentation.java:1084)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2126)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2269)
            at android.app.ActivityThread.access$800(ActivityThread.java:139)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5102)
            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:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)
that's the InicioActivity:
package com.rep.app.principal;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import com.rep.R;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class InicioActivity extends SherlockFragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AutenticacaoLocalTask mAutenticacaoLocalTask = new AutenticacaoLocalTask();
mAutenticacaoLocalTask.execute((Void) null);
}
private TextView txtDisplay;
RequestQueue queue = Volley.newRequestQueue(this);
public class AutenticacaoLocalTask extends AsyncTask<Void, Void, Boolean> {
#Override
protected Boolean doInBackground(Void... params) {
try {
txtDisplay = (TextView) findViewById(R.id.txtDisplay);
String url = "http://192.168.1.15/rep-api/api/clients";
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET,
url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
txtDisplay.setText("Response => "+response.toString());
findViewById(R.id.progressBar1).setVisibility(View.GONE);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Error: " + error.getMessage());
}
})
{
#Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("X-API-TOKEN", "99KI9Gj68CgCf70deM22Ka64chef2C40Gm2lFJ2J0G9JkD0bDAcbFfd19MfacGf3FFm8CM1hG0eDiIk8");
return headers;
}
};
queue.add(jsonObjReq);
return true;
} catch (Exception e) {
Log.e("RM", e.getMessage());
return false;
}
}
#Override
protected void onPostExecute(final Boolean success) {
}
#Override
protected void onCancelled() {
}
}
}
and the Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rep"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity
android:name=".app.principal.InicioActivity"
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=".app.login.LoginActivity"
android:configChanges="keyboardHidden"
android:label="#string/app_name">
</activity>
<activity
android:name=".app.principal.MainActivity"
android:label="#string/app_name"></activity>
<activity android:name=".app.cliente.ClienteDetalheActivity"
android:label="#string/app_name"></activity>
<activity android:name=".app.login.LoginTelaBloqueada"
android:label="#string/app_name"></activity>
</application>
</manifest>

Initialize your RequestQueue, using Volley.newRequestQueue(this);, in onCreate() after the super.onCreate() call. You are trying to use your Activity from an initializer, which frequently causes problems like this.
Step #1: Replace:
RequestQueue queue = Volley.newRequestQueue(this);
with:
RequestQueue queue = null;
Step #2: Change your onCreate() to be:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
queue=Volley.newRequestQueue(this);
AutenticacaoLocalTask mAutenticacaoLocalTask = new AutenticacaoLocalTask();
mAutenticacaoLocalTask.execute((Void) null);
}

Unable to start activity error with Scene2D

We are trying to draw something with the scene2D from libGDX. We have our main activity then use the extends Androidapplication to initialize our testgame class. Here we define our screen and then make our stage and actors in the screen class.
Problem is that we are getting the same error over and over:
>
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gamepadTest.app/com.gamepadTest.app.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.gamepadTest.app/com.gamepadTest.app.TestGame}; have you declared this activity in your AndroidManifest.xml?
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.gamepadTest.app.MainActivity" on path: DexPathList[[zip file "/data/app/com.gamepadTest.app-1.apk"],nativeLibraryDirectories=[/data/app- lib/com.gamepadTest.app-1, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
            
> at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
Have a look:
import android.os.Bundle;
import com.badlogic.gdx.backends.android.AndroidApplication;
import com.badlogic.gdx.backends.android.AndroidApplicationConfiguration;
public class MainActivity extends AndroidApplication {
private TestGame testGame = new TestGame();
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
AndroidApplicationConfiguration cfg = new AndroidApplicationConfiguration();
initialize(testGame, cfg);
}
}
import com.badlogic.gdx.Game;
public class TestGame extends Game
{
TestScreen testScreen;
#Override
public void create() {
testScreen = new TestScreen();
setScreen(testScreen);
}
#Override
public void dispose() {
testScreen.dispose();
}
}
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.scenes.scene2d.Stage;
public class TestScreen implements Screen {
private Stage stage;
private TestActor testActor;
public TestScreen() {
stage = new Stage();
Gdx.input.setInputProcessor(stage);
testActor = new TestActor();
stage.addActor(testActor);
}
public void resize(int width, int height) {
stage.setViewport(800, 600, false);
stage.getCamera().translate(-stage.getGutterWidth(), -stage.getGutterHeight(), 0);
}
#Override
public void render(float delta) {
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
stage.act(delta);
stage.draw();
}
#Override public void dispose() {
stage.dispose();
}
#Override public void show() {}
#Override public void hide() {}
#Override public void pause() {}
#Override public void resume() {}
}
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.scenes.scene2d.Actor;
public class TestActor extends Actor{
private ShapeRenderer renderer;
#Override
public void act(float delta) {
super.act(delta);
renderer = new ShapeRenderer();
}
#Override
public void draw (SpriteBatch batch, float parentAlpha) {
batch.end();
renderer.setProjectionMatrix(batch.getProjectionMatrix());
renderer.setTransformMatrix(batch.getTransformMatrix());
renderer.translate(getX(), getY(), 0);
renderer.begin(ShapeRenderer.ShapeType.Point);
renderer.rect(0, 0, 100, 100);
renderer.end();
batch.begin();
}
}
UPDATE:
Here is my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gamepadTest.app"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.gamepadTest.app.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 have to declare your activity TestGame inside your AndroidManifest.xml as <activity>
For more info about the manifest: http://developer.android.com/guide/topics/manifest/manifest-intro.html
Should look something like this, and needs to be inside the <application>-tag:
<activity
android:name="com.example.TestGame"
android:label="#string/app_name" >
</activity>

TestGame isn't an Activity:
public class TestGame extends Game{
The Activity you must declare is MainActivity. So its wierd, probably you made another Activity with that same name. But anyway, try setting it with dot notation instead of the whole package:
<activity
android:name=".TestGame"
android:label="#string/app_name" >
</activity>
See this:
Unable to find explicit activity class

Why am I getting a force close? [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 10 years ago.
I know I have already asked this question but no one answered after the first answer which I changed what he told me and still no result
HOME.java
package com.example.decrypter;
import android.os.Bundle;
import android.app.Activity;
import android.app.Application;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.AdapterView.OnItemSelectedListener;
public class Home extends Activity implements OnItemSelectedListener {
Button btn_start,btn_about,btn_exit;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
btn_start = (Button) findViewById(R.id.btn_start);
btn_about = (Button) findViewById(R.id.btn_about);
btn_exit = (Button) findViewById(R.id.btn_exit);
btn_start.setOnClickListener( new View.OnClickListener()
{
public void onClick(View v) {
Intent start = new Intent(Home.this, MainPage.class);
Home.this.startActivity(start);
}
});
btn_about.setOnClickListener( new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
Intent about = new Intent(Home.this, about.class);
Home.this.startActivity(about);
}
});
btn_exit.setOnClickListener( new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
System.exit(0);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.layout.home, menu);
return true;
}
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
MainPage.java
package com.example.decrypter;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
import android.widget.TextView;
public class MainPage extends Activity implements OnItemSelectedListener {
double random1,random2,random3,random4,random5;
int check1,check2,check3,check4,check5;
EditText textbox;
int guess;
String s1,s2,s3,s4,s5;
Spinner spinner1,spinner2,spinner3,spinner4,spinner5;
TextView display1,display2,display3,display4,display5;
Integer[] numbers = {1,2,3,4,5,6,7,8,9};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayAdapter <Integer> adapter1 = new ArrayAdapter <Integer>(this,
android.R.layout.simple_spinner_item, numbers);
setContentView(R.layout.activity_main_page);
spinner1 =(Spinner) findViewById(R.id.spinner01);
spinner2= (Spinner) findViewById(R.id.spinner02);
spinner3= (Spinner) findViewById(R.id.spinner03);
spinner4= (Spinner) findViewById(R.id.spinner04);
spinner5= (Spinner) findViewById(R.id.spinner05);
display1 = (TextView) findViewById(R.id.txtdisplay1);
display2 = (TextView) findViewById(R.id.txtdisplay2);
display3 = (TextView) findViewById(R.id.txtdisplay3);
display4 = (TextView) findViewById(R.id.txtdisplay4);
display5 = (TextView) findViewById(R.id.txtdisplay5);
Button btnrandom = (Button) findViewById(R.id.btnrandom);
Button btn1 = (Button) findViewById(R.id.btn1);
spinner1.setAdapter(adapter1);
spinner1.setOnItemSelectedListener(this);
spinner2.setAdapter(adapter1);
spinner2.setOnItemSelectedListener(this);
spinner3.setAdapter(adapter1);
spinner3.setOnItemSelectedListener(this);
spinner4.setAdapter(adapter1);
spinner4.setOnItemSelectedListener(this);
spinner5.setAdapter(adapter1);
spinner5.setOnItemSelectedListener(this);
btnrandom.setOnClickListener( new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
random1 = Math.floor(Math.random()*10);
random2 = Math.floor(Math.random()*10);
random3 = Math.floor(Math.random()*10);
random4 = Math.floor(Math.random()*10);
random5 = Math.floor(Math.random()*10);
//display.setText("random:" + random1);
/*check1 = Integer.parseInt(spinner1.getSelectedItem().toString()) ;
*/
}
});
btn1.setOnClickListener( new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
if(check1==random1){
display1.setTextColor(Color.GREEN);
s1= Integer.toString(check1);
display1.setText(s1);
}
else{
display1.setTextColor(Color.RED);
s1= Integer.toString(check1);
display1.setText(s1);
}
if(check2==random2){
display2.setTextColor(Color.GREEN);
s2= Integer.toString(check2);
display2.setText(s2);
}
else{
display2.setTextColor(Color.RED);
s2= Integer.toString(check2);
display2.setText(s2);
}
if(check3==random3){
display3.setTextColor(Color.GREEN);
s3= Integer.toString(check3);
display3.setText(s3);
}
else{
display3.setTextColor(Color.RED);
s3= Integer.toString(check3);
display3.setText(s3);
}
if(check4==random4){
display4.setTextColor(Color.GREEN);
s4= Integer.toString(check4);
display4.setText(s4);
}
else{
display4.setTextColor(Color.RED);
s4= Integer.toString(check4);
display4.setText(s4);
}
if(check5==random5){
display5.setTextColor(Color.GREEN);
s5= Integer.toString(check5);
display5.setText(s5);
}
else{
display5.setTextColor(Color.RED);
s5= Integer.toString(check5);
display5.setText(s5);
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.layout.activity_main_page, menu);
return true;
}
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
check1 = Integer.parseInt(spinner1.getSelectedItem().toString());
check2 = Integer.parseInt(spinner2.getSelectedItem().toString()) ;
check3 = Integer.parseInt(spinner3.getSelectedItem().toString()) ;
check4 = Integer.parseInt(spinner4.getSelectedItem().toString()) ;
check5 = Integer.parseInt(spinner5.getSelectedItem().toString()) ;
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
Splash.java
package com.example.decrypter;
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
public class Splash extends Activity {
MediaPlayer splashSong;
#Override
protected void onCreate(Bundle splashpage) {
// TODO Auto-generated method stub
super.onCreate(splashpage);
setContentView(R.layout.splash);
splashSong = MediaPlayer.create(Splash.this, R.raw.splashsound);
splashSong.start();
Thread timer = new Thread(){
public void run(){
try{
sleep(5000);
} catch (InterruptedException e){
e.printStackTrace();
} finally {
Intent openHome = new Intent
("com.example.decrypter.HOME");
startActivity(openHome);
}
}
};
timer.start();
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
//splashSong.release();
finish();
}
}
Android Manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.decrypter"
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" >
<activity
android:name=".Splash"
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=".Home"
android:label="#string/title_activity_home" >
<intent-filter>
<action android:name="com.example.decrypter.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".about"
android:label="about" >
<intent-filter>
<action android:name="com.example.decrypter.ABOUT" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".MainPage"
android:label="MainPage" >
<intent-filter>
<action android:name="com.example.decrypter.MAINPAGE" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
LOGCAT ERROR
12-11 11:36:27.182: D/dalvikvm(336): GC_EXTERNAL_ALLOC freed 55K, 53% free 2570K/5379K, external 2131K/2137K, paused 53ms
12-11 11:36:27.271: D/AndroidRuntime(336): Shutting down VM
12-11 11:36:27.271: W/dalvikvm(336): threadid=1: thread exiting with uncaught exception (group=0x40015560)
12-11 11:36:27.291: E/AndroidRuntime(336): FATAL EXCEPTION: main
12-11 11:36:27.291: E/AndroidRuntime(336): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.decrypter/com.example.decrypter.Home}: java.lang.ClassCastException: android.widget.RelativeLayout
12-11 11:36:27.291: E/AndroidRuntime(336): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
12-11 11:36:27.291: E/AndroidRuntime(336): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
12-11 11:36:27.291: E/AndroidRuntime(336): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-11 11:36:27.291: E/AndroidRuntime(336): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-11 11:36:27.291: E/AndroidRuntime(336): at android.os.Handler.dispatchMessage(Handler.java:99)
12-11 11:36:27.291: E/AndroidRuntime(336): at android.os.Looper.loop(Looper.java:123)
12-11 11:36:27.291: E/AndroidRuntime(336): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-11 11:36:27.291: E/AndroidRuntime(336): at java.lang.reflect.Method.invokeNative(Native Method)
12-11 11:36:27.291: E/AndroidRuntime(336): at java.lang.reflect.Method.invoke(Method.java:507)
12-11 11:36:27.291: E/AndroidRuntime(336): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-11 11:36:27.291: E/AndroidRuntime(336): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-11 11:36:27.291: E/AndroidRuntime(336): at dalvik.system.NativeStart.main(Native Method)
12-11 11:36:27.291: E/AndroidRuntime(336): Caused by: java.lang.ClassCastException: android.widget.RelativeLayout
12-11 11:36:27.291: E/AndroidRuntime(336): at com.example.decrypter.Home.onCreate(Home.java:23)
12-11 11:36:27.291: E/AndroidRuntime(336): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-11 11:36:27.291: E/AndroidRuntime(336): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
12-11 11:36:27.291: E/AndroidRuntime(336): ... 11 more

First, try cleaning your project (e.g., Project > Clean from the Eclipse main menu). If that does not help, you have a RelativeLayout in activity_main_page.xml that has the wrong android:id value, apparently. Which ID it is using would be based on line 23 of your Home.java class, whichever line that is.

you don't deserve but:
12-11 11:36:27.291: E/AndroidRuntime(336): Caused by: java.lang.ClassCastException: android.widget.RelativeLayout
12-11 11:36:27.291: E/AndroidRuntime(336): at com.example.decrypter.Home.onCreate(Home.java:23)
that means... on com.example.decrypter.Home.OnCreate, on line 23 you're casting something to RelativeLayout, and it's NOT a relative layout!
learn to read, you must, young padwan!