Another FATAL EXCEPTION MAIN in android programming

Question

I looked up other similar questions and couldn't find a solution, so here I am. I am a complete beginner in Java and android programming, even though I have a quite good knowledge of C and basic knowledge of C++ and Python, as well as a few more specific programs like Mathematica and ROOT.

I tried making an extremely simple android app: a number displayed and two buttons which raise or decrease the number, but I get tons of errors. If you kindly have time to help me, I feel really discouraged by this first impact.

This is my .xml 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:background="@style/AppTheme"
    android:orientation="vertical"
    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=".StartActivity" >


    <TextView

        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/text1"
        android:textSize="45sp"
        android:layout_gravity="center"
        android:gravity="center"
        android:id="@+id/tvDisplay"
        />

     <Button
         android:id="@+id/bSub"
         android:layout_width="250sp"
         android:layout_height="wrap_content"
         android:layout_alignParentLeft="true"
         android:layout_centerVertical="true"
         android:text="@string/button2"
         android:textSize="20sp" />

     <Button
         android:id="@+id/bAdd"
         android:layout_width="250sp"
         android:layout_height="wrap_content"
         android:layout_alignLeft="@+id/tvDisplay"
         android:layout_below="@+id/tvDisplay"
         android:layout_marginTop="30dp"
         android:text="@string/button1"
         android:textSize="20sp" />

</RelativeLayout>

And this is my .java file:

package com.appdiprova.giovanni;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class StartActivity extends Activity {

    int counter; 
    Button add,sub;
    TextView display;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start);
        counter=0;
        add= (Button) findViewById(R.id.bAdd);
        sub= (Button) findViewById(R.id.bSub);
        display = (TextView) findViewById(R.id.tvDisplay);

        add.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                counter=counter+1;
                display.setText("Your total is " + counter);
            }
        });
        sub.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                counter=counter-1;
                display.setText("Your total is " + counter);
            }
        });
    }


    @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, menu);
        return true;
    }

}

As I run the program I get in the LogCat a long list of errors, the first of which tells me FATAL EXCEPTION MAIN.

How can I solve this? Thank you very much

EDIT I'm sorry, I'll post also the manifest and the LogCat

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.appdiprova.giovanni"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        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.appdiprova.giovanni.StartActivity"
            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>

Ok I am fairly confused, since now I don't get FATAL ECEPTION anymore, but still a lot of errors:

11-15 08:39:35.410: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.410: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.420: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.420: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.420: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.420: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.420: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.420: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.430: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.430: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:35.430: E/SoundPool(370): error loading /system/media/audio/ui/KeypressStandard.ogg
11-15 08:39:35.430: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressStandard.ogg
11-15 08:39:35.450: E/SoundPool(370): error loading /system/media/audio/ui/KeypressSpacebar.ogg
11-15 08:39:35.450: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressSpacebar.ogg
11-15 08:39:35.450: E/SoundPool(370): error loading /system/media/audio/ui/KeypressDelete.ogg
11-15 08:39:35.450: I/ActivityManager(370): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.appdiprova.giovanni/.StartActivity} from pid 546
11-15 08:39:35.460: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressDelete.ogg
11-15 08:39:35.460: E/SoundPool(370): error loading /system/media/audio/ui/KeypressReturn.ogg
11-15 08:39:35.470: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressReturn.ogg
11-15 08:39:35.470: E/SoundPool(370): error loading /system/media/audio/ui/KeypressInvalid.ogg
11-15 08:39:35.470: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressInvalid.ogg
11-15 08:39:35.470: W/AudioService(370): onLoadSoundEffects(), Error -1 while loading samples
11-15 08:39:35.560: E/gralloc_goldfish(50): gralloc_alloc: Mismatched usage flags: 246 x 410, usage 333
11-15 08:39:35.560: W/GraphicBufferAllocator(50): alloc(246, 410, 1, 00000333, ...) failed -22 (Invalid argument)
11-15 08:39:35.560: E/(50): GraphicBufferAlloc::createGraphicBuffer(w=246, h=410) failed (Invalid argument), handle=0x0
11-15 08:39:35.560: E/BufferQueue(370): [ScreenshotClient] dequeueBuffer: SurfaceComposer::createGraphicBuffer failed
11-15 08:39:35.570: W/WindowManager(370): Screenshot failure taking screenshot for (246x410) to layer 21005
11-15 08:39:35.780: D/LightsService(370): Excessive delay setting light: 392ms
11-15 08:39:35.850: D/dalvikvm(924): Not late-enabling CheckJNI (already on)
11-15 08:39:35.870: I/ActivityManager(370): Start proc com.appdiprova.giovanni for activity com.appdiprova.giovanni/.StartActivity: pid=924 uid=10051 gids={50051}
11-15 08:39:36.610: D/AndroidRuntime(924): Shutting down VM
11-15 08:39:36.610: W/dalvikvm(924): threadid=1: thread exiting with uncaught exception (group=0xb3ad1b90)
11-15 08:39:36.630: E/AndroidRuntime(924): FATAL EXCEPTION: main
11-15 08:39:36.630: E/AndroidRuntime(924): Process: com.appdiprova.giovanni, PID: 924
11-15 08:39:36.630: E/AndroidRuntime(924): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.appdiprova.giovanni/com.appdiprova.giovanni.StartActivity}: android.view.InflateException: Binary XML file line #1: Error inflating class android.widget.RelativeLayout
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.ActivityThread.access$700(ActivityThread.java:135)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.os.Handler.dispatchMessage(Handler.java:102)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.os.Looper.loop(Looper.java:137)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.ActivityThread.main(ActivityThread.java:4998)
11-15 08:39:36.630: E/AndroidRuntime(924):  at java.lang.reflect.Method.invokeNative(Native Method)
11-15 08:39:36.630: E/AndroidRuntime(924):  at java.lang.reflect.Method.invoke(Method.java:515)
11-15 08:39:36.630: E/AndroidRuntime(924):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
11-15 08:39:36.630: E/AndroidRuntime(924):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
11-15 08:39:36.630: E/AndroidRuntime(924):  at dalvik.system.NativeStart.main(Native Method)
11-15 08:39:36.630: E/AndroidRuntime(924): Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class android.widget.RelativeLayout
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.LayoutInflater.createView(LayoutInflater.java:620)
11-15 08:39:36.630: E/AndroidRuntime(924):  at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.LayoutInflater.inflate(LayoutInflater.java:469)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
11-15 08:39:36.630: E/AndroidRuntime(924):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.Activity.setContentView(Activity.java:1928)
11-15 08:39:36.630: E/AndroidRuntime(924):  at com.appdiprova.giovanni.StartActivity.onCreate(StartActivity.java:20)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.Activity.performCreate(Activity.java:5243)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
11-15 08:39:36.630: E/AndroidRuntime(924):  ... 11 more
11-15 08:39:36.630: E/AndroidRuntime(924): Caused by: java.lang.reflect.InvocationTargetException
11-15 08:39:36.630: E/AndroidRuntime(924):  at java.lang.reflect.Constructor.constructNative(Native Method)
11-15 08:39:36.630: E/AndroidRuntime(924):  at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.LayoutInflater.createView(LayoutInflater.java:594)
11-15 08:39:36.630: E/AndroidRuntime(924):  ... 23 more
11-15 08:39:36.630: E/AndroidRuntime(924): Caused by: android.content.res.Resources$NotFoundException: Resource is not a Drawable (color or path): TypedValue{t=0x1/d=0x7f060001 a=-1 r=0x7f060001}
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.content.res.Resources.loadDrawable(Resources.java:2068)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.content.res.TypedArray.getDrawable(TypedArray.java:602)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.View.<init>(View.java:3545)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.View.<init>(View.java:3475)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.view.ViewGroup.<init>(ViewGroup.java:464)
11-15 08:39:36.630: E/AndroidRuntime(924):  at android.widget.RelativeLayout.<init>(RelativeLayout.java:236)
11-15 08:39:36.630: E/AndroidRuntime(924):  ... 26 more
11-15 08:39:36.650: W/ActivityManager(370):   Force finishing activity com.appdiprova.giovanni/.StartActivity
11-15 08:39:37.050: I/WindowManager(370): Screenshot max retries 4 of Token{b40edef0 ActivityRecord{b40edd90 u0 com.appdiprova.giovanni/.StartActivity t3 f}} appWin=Window{b41b27f0 u0 Starting com.appdiprova.giovanni} drawState=4
11-15 08:39:37.050: W/WindowManager(370): Screenshot failure taking screenshot for (480x800) to layer 21010
11-15 08:39:37.560: W/ActivityManager(370): Activity pause timeout for ActivityRecord{b40edd90 u0 com.appdiprova.giovanni/.StartActivity t3 f}
11-15 08:39:37.900: W/EGL_emulation(546): eglSurfaceAttrib not implemented
11-15 08:39:38.640: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.640: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.640: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.640: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.640: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.650: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.650: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.650: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.650: E/SoundPool(370): error loading /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.650: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
11-15 08:39:38.680: E/SoundPool(370): error loading /system/media/audio/ui/KeypressStandard.ogg
11-15 08:39:38.680: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressStandard.ogg
11-15 08:39:38.710: E/SoundPool(370): error loading /system/media/audio/ui/KeypressSpacebar.ogg
11-15 08:39:38.710: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressSpacebar.ogg
11-15 08:39:38.720: E/SoundPool(370): error loading /system/media/audio/ui/KeypressDelete.ogg
11-15 08:39:38.720: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressDelete.ogg
11-15 08:39:38.720: E/SoundPool(370): error loading /system/media/audio/ui/KeypressReturn.ogg
11-15 08:39:38.720: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressReturn.ogg
11-15 08:39:38.730: E/SoundPool(370): error loading /system/media/audio/ui/KeypressInvalid.ogg
11-15 08:39:38.730: W/AudioService(370): Soundpool could not load file: /system/media/audio/ui/KeypressInvalid.ogg
11-15 08:39:38.730: W/AudioService(370): onLoadSoundEffects(), Error -1 while loading samples
11-15 08:39:38.800: I/Process(924): Sending signal. PID: 924 SIG: 9
11-15 08:39:38.800: W/InputMethodManagerService(370): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@b41dee38 attribute=null, token = android.os.BinderProxy@b4048d78
11-15 08:39:38.830: I/ActivityManager(370): Process com.appdiprova.giovanni (pid 924) has died.
11-15 08:39:42.300: D/MobileDataStateTracker(370): default: setPolicyDataEnable(enabled=true)
11-15 08:39:43.530: E/NetdConnector(370): NDC Command {47 bandwidth setiquota eth0 9223372036854775807} took too long (782ms)

Answer 1

I think the problem is the android:background property of your RelativeLayout:

android:background="@style/AppTheme"

Android tells you

Caused by: android.content.res.Resources$NotFoundException: Resource is not a Drawable (color or path): TypedValue{t=0x1/d=0x7f060001 a=-1 r=0x7f060001}

The system expects the background resource to be a Drawable, not a style. Use style to set a style, or android:background to set a Drawable to be used as the background:

style="@style/AppTheme"

Update: From the docs about android:background:

A drawable to use as the background. This can be either a reference to a full drawable resource (such as a PNG image, 9-patch, XML state list description, etc), or a solid color such as "#ff000000" (black).

You can read more about styles and themes in the Android developer guide.