Develop Reference

android.content.res.Resources android.content.Context.getResources() error when using github repository

I am using https://github.com/BlacKCaT27/CurrencyEditText to enter currency into my application and I am using this code:
CurrencyEditText cet = new CurrencyEditText(this, null);
Here is the logcat:
Process: com.dharquissandas.budget, PID: 17620
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.dharquissandas.budget/com.dharquissandas.budget.add_expense}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2819)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
at android.content.ContextWrapper.getResources(ContextWrapper.java:86)
at android.view.ContextThemeWrapper.getResourcesInternal(ContextThemeWrapper.java:127)
at android.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java:121)
at android.support.v7.app.AppCompatActivity.getResources(AppCompatActivity.java:542)
at android.view.View.<init>(View.java:4306)
at android.view.View.<init>(View.java:4454)
at android.widget.TextView.<init>(TextView.java:995)
at android.widget.EditText.<init>(EditText.java:79)
at android.widget.EditText.<init>(EditText.java:75)
at android.widget.EditText.<init>(EditText.java:71)
at com.blackcat.currencyedittext.CurrencyEditText.<init>(CurrencyEditText.java:33)
at com.dharquissandas.budget.add_expense.<init>(add_expense.java:29)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1086)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2809)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988) 
at android.app.ActivityThread.-wrap14(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6682) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410) 
What am I doing wrong I don't know, I am fairly new to android programming can someone help me out. What am I supposed to put in the attribute part of the code?
Here is my code: https://pastebin.com/57mTUMWX

You should not be creating view elements in your Code.
Add the view for CurrencyText to your XML.
Then you make sure it has an #+id/myName and find it by doing
CurrencyText myText = findViewById(R.id.myName);

Google Maps CreatorImpl not initialized properly error

having some trouble with my app crashing after extended periods of inactivity. It appears to be with something saying CreatorImpl not initialized properly.
Here is my full logcat response:
.... java.lang.IllegalStateException: CreatorImpl not initialized properly.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2452)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2535)
at android.app.ActivityThread.access$900(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:152)
at android.app.ActivityThread.main(ActivityThread.java:5497)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IllegalStateException: CreatorImpl not initialized properly.
at com.google.maps.api.android.lib6.common.l.a(:com.google.android.gms.DynamiteModulesB:14)
at com.google.android.gms.maps.internal.CreatorImpl.newMapViewDelegate(:com.google.android.gms.DynamiteModulesB:26)
at com.google.android.gms.maps.internal.g.onTransact(:com.google.android.gms.DynamiteModulesB:51)
at android.os.Binder.transact(Binder.java:401)
at uni.newMapViewDelegate(:com.google.android.gms:3)
at com.google.android.gms.maps.internal.CreatorImpl.newMapViewDelegate(:com.google.android.gms:1)
at unh.onTransact(:com.google.android.gms:22)
at android.os.Binder.transact(Binder.java:401)
at com.google.android.gms.internal.zzed.zza(Unknown Source)
at com.google.android.gms.maps.internal.zzf.zza(Unknown Source)
at com.google.android.gms.maps.MapView$zzb.zza(Unknown Source)
at com.google.android.gms.dynamic.zza.zza(Unknown Source)
at com.google.android.gms.dynamic.zza.onCreate(Unknown Source)
at com.google.android.gms.maps.MapView.onCreate(Unknown Source)
at com.application.fragments.nav_drawer_directory.c_attending.FragmentWeekendExp.onCreateView(FragmentWeekendExp.java:109)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2192)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1299)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2900)
at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:603)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
at com.application.MainActivity.onStart(MainActivity.java:124)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1277)
at android.app.Activity.performStart(Activity.java:6306)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2415)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2535) 
at android.app.ActivityThread.access$900(ActivityThread.java:155) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:152) 
at android.app.ActivityThread.main(ActivityThread.java:5497) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2452)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2535)
at android.app.ActivityThread.access$900(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:152)
at android.app.ActivityThread.main(ActivityThread.java:5497)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IllegalStateException: CreatorImpl not initialized properly.
at com.google.maps.api.android.lib6.common.l.a(:com.google.android.gms.DynamiteModulesB:14)
at com.google.android.gms.maps.internal.CreatorImpl.newMapViewDelegate(:com.google.android.gms.DynamiteModulesB:26)
at com.google.android.gms.maps.internal.g.onTransact(:com.google.android.gms.DynamiteModulesB:51)
at android.os.Binder.transact(Binder.java:401)
at uni.newMapViewDelegate(:com.google.android.gms:3)
at com.google.android.gms.maps.internal.CreatorImpl.newMapViewDelegate(:com.google.android.gms:1)
at unh.onTransact(:com.google.android.gms:22)
at android.os.Binder.transact(Binder.java:401)
at com.google.android.gms.internal.zzed.zza(Unknown Source)
at com.google.android.gms.maps.internal.zzf.zza(Unknown Source)
at com.google.android.gms.maps.MapView$zzb.zza(Unknown Source)
at com.google.android.gms.dynamic.zza.zza(Unknown Source)
at com.google.android.gms.dynamic.zza.onCreate(Unknown Source)
at com.google.android.gms.maps.MapView.onCreate(Unknown Source)
at com.application.fragments.nav_drawer_directory.c_attending.FragmentWeekendExp.onCreateView(FragmentWeekendExp.java:109)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2192)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1299)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2900)
at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:603)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
at com.application.MainActivity.onStart(MainActivity.java:124)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1277)
at android.app.Activity.performStart(Activity.java:6306)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2415)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2535) 
at android.app.ActivityThread.access$900(ActivityThread.java:155) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:152) 
at android.app.ActivityThread.main(ActivityThread.java:5497) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
The point of where it is crashing is here:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View parentView = inflater.inflate(R.layout.ad_weekendexp_frag, container, false);
//Setup map, using a custom one to prevent scrollview from scrolling when the user is
//touching down on the map
mMapView = (CustomMapView) parentView.findViewById(R.id.wkndExpMapview);
(--> crash here) mMapView.onCreate(savedInstanceState);
mMapView.getMapAsync(this);
//Initialize Views
findViews(parentView);
//Set up clickables, any that may be used here
setupClickables();
//Sets up the recycler view which will display the list which has details of what to expect
//on any given service on the weekend
setupSvcDescipList();
//Prevent the background from being transparent
parentView.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.colorSecondary));
return parentView;
Also, as a side note, I have also overridden onCreate(), onPause(), ect as per guidance for setting up a mapview. All help is appreciated! Thanks

My application in android keeps on crashing

I keep on getting this error in my logcat and don't know why. I don't seem to have any errors in code either. Any help will be greatly appreciated.
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.admin.trainyourmath, PID: 26931
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.admin.trainyourmath/com.example.admin.trainyourmath.MainActivity}: java.lang.ClassCastException: com.example.admin.trainyourmath.MainActivity cannot be cast to android.view.View$OnClickListener
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2434)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494)
at android.app.ActivityThread.access$900(ActivityThread.java:157)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5551)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
Caused by: java.lang.ClassCastException: com.example.admin.trainyourmath.MainActivity cannot be cast to android.view.View$OnClickListener
at com.example.admin.trainyourmath.MainActivity.onCreate(MainActivity.java:31)
at android.app.Activity.performCreate(Activity.java:6272)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494) 
at android.app.ActivityThread.access$900(ActivityThread.java:157) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5551) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620) 

You are using your MainActivity as a OnClickListener which it does not implement properly. Add implements View.OnClickListener to the end of your MainActivity class declaration if it's not already there. Should look something like:
public class MainActivity extends AppCompatActivity implements View.OnClickListener
You also need to implement all the methods of the View.OnClickListener so inside your MainActivity class add:
#Override
public void onClick(View v) {
// Do stuff
}

Unable to start activity ComponentInfo{com.viralandroid.test/com.paypal.android.sdk.payments.PaymentActivity}:

How could I solve the problem below? I searched a lot but I didn't figure out.
I am using a fragment instead of an activity to call PaymentActivity.
Thanks in advance.
There is a piece of code below.
public void executarPagtoPayPal()
{
SearchResultsAdapter searchResultsAdapter = new SearchResultsAdapter(getActivity(), new ArrayList<Produto>());
PayPalPayment coisasAComprar = searchResultsAdapter.prepararCarrinhoFinal();
Intent i = new Intent(getActivity(), PaymentActivity.class);
i.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, payPalConfiguration);
i.putExtra(PaymentActivity.EXTRA_PAYMENT, coisasAComprar);
startActivityForResult(i,CODIGO_PAGTO);
}
06-01 13:26:31.841 12770-12770/com.viralandroid.test E/Parcel: Class not found when unmarshalling:
java.lang.ClassNotFoundException: Invalid name:
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:309)
at android.os.Parcel.readParcelableCreator(Parcel.java:2281)
at android.os.Parcel.readParcelable(Parcel.java:2245)
at com.paypal.android.sdk.payments.PayPalPayment.(Unknown Source)
at com.paypal.android.sdk.payments.PayPalPayment.(Unknown Source)
at com.paypal.android.sdk.payments.br.createFromParcel(Unknown Source)
at android.os.Parcel.readParcelable(Parcel.java:2252)
at android.os.Parcel.readValue(Parcel.java:2152)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2485)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.BaseBundle.containsKey(BaseBundle.java:269)
at android.content.Intent.hasExtra(Intent.java:5055)
at com.paypal.android.sdk.payments.d.b(Unknown Source)
at com.paypal.android.sdk.payments.PaymentActivity.onCreate(Unknown Source)
at android.app.Activity.performCreate(Activity.java:6178)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5910)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
06-01 13:26:31.841 12770-12770/com.viralandroid.test D/AndroidRuntime: Shutting down VM
06-01 13:26:31.841 12770-12770/com.viralandroid.test E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.viralandroid.test, PID: 12770
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.viralandroid.test/com.paypal.android.sdk.payments.PaymentActivity}: android.os.BadParcelableException: ClassNotFoundException when unmarshalling:
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2695)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5910)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
Caused by: android.os.BadParcelableException: ClassNotFoundException when unmarshalling:
at android.os.Parcel.readParcelableCreator(Parcel.java:2295)
at android.os.Parcel.readParcelable(Parcel.java:2245)
at com.paypal.android.sdk.payments.PayPalPayment.(Unknown Source)
at com.paypal.android.sdk.payments.PayPalPayment.(Unknown Source)
at com.paypal.android.sdk.payments.br.createFromParcel(Unknown Source)
at android.os.Parcel.readParcelable(Parcel.java:2252)
at android.os.Parcel.readValue(Parcel.java:2152)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2485)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.BaseBundle.containsKey(BaseBundle.java:269)
at android.content.Intent.hasExtra(Intent.java:5055)
at com.paypal.android.sdk.payments.d.b(Unknown Source)
at com.paypal.android.sdk.payments.PaymentActivity.onCreate(Unknown Source)
at android.app.Activity.performCreate(Activity.java:6178)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769) 
at android.app.ActivityThread.access$900(ActivityThread.java:177) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5910) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) 

It looks like the contents of the PayPalPayment that you are putting in the Intent are not correct. Please validate that this object has all the correct data.

v7 support 23.0.1 crash: AppCompatButton.setBackgroundDrawable

I am experiencing this crash, with support library 23.0.1
It happens when showing a Dialog Fragment.
It verifies with both android.support.v4.app.DialogFragment and android.support.v7.app.AppCompatDialogFragment
Anyone else is experiencing this?
It always happens with release compilation (which has Proguard enabled), and only in some cases with debug compilation.
I am reporting the crash stacks for both fragment classes.
stack for android.support.v4.app.DialogFragment:
android.view.InflateException: Binary XML file line #115: Error inflating class Button
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
at com.android.internal.app.AlertController.installContent(AlertController.java:235)
at android.app.AlertDialog.onCreate(AlertDialog.java:356)
at android.app.Dialog.dispatchOnCreate(Dialog.java:373)
at android.app.Dialog.show(Dialog.java:274)
at android.support.v4.app.DialogFragment.onStart(SourceFile:406)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1060)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1207)
at android.support.v4.app.BackStackRecord.run(SourceFile:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(SourceFile:1572)
at android.support.v4.app.FragmentManagerImpl$1.run(SourceFile:493)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.o.a()' on a null object reference
at android.support.v7.widget.AppCompatButton.setBackgroundDrawable(SourceFile:85)
at android.view.View.setBackground(View.java:16226)
at android.view.View.(View.java:4103)
at android.widget.TextView.(TextView.java:637)
at android.widget.Button.(Button.java:111)
at android.widget.Button.(Button.java:107)
at android.support.v7.widget.AppCompatButton.(SourceFile:64)
at android.support.v7.widget.AppCompatButton.(SourceFile:60)
at android.support.v7.internal.app.AppCompatViewInflater.createView(SourceFile:101)
at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(SourceFile:966)
at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(SourceFile:44)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:725)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
at com.android.internal.app.AlertController.installContent(AlertController.java:235)
at android.app.AlertDialog.onCreate(AlertDialog.java:356)
at android.app.Dialog.dispatchOnCreate(Dialog.java:373)
at android.app.Dialog.show(Dialog.java:274)
at android.support.v4.app.DialogFragment.onStart(SourceFile:406)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1060)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1207)
at android.support.v4.app.BackStackRecord.run(SourceFile:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(SourceFile:1572)
at android.support.v4.app.FragmentManagerImpl$1.run(SourceFile:493)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
stack for android.support.v7.app.AppCompatDialogFragment:
android.view.InflateException: Binary XML file line #29: Error inflating class Button
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at eu.baroncelli.oraritrenitalia.mainactivity.AlertDialogFragment.onCreateView(SourceFile:62)
at android.support.v4.app.Fragment.performCreateView(SourceFile:1962)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1026)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1207)
at android.support.v4.app.BackStackRecord.run(SourceFile:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(SourceFile:1572)
at android.support.v4.app.FragmentManagerImpl$1.run(SourceFile:493)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.o.a()' on a null object reference
at android.support.v7.widget.AppCompatButton.setBackgroundDrawable(SourceFile:85)
at android.view.View.setBackground(View.java:16226)
at android.view.View.(View.java:4103)
at android.widget.TextView.(TextView.java:637)
at android.widget.Button.(Button.java:111)
at android.widget.Button.(Button.java:107)
at android.support.v7.widget.AppCompatButton.(SourceFile:64)
at android.support.v7.widget.AppCompatButton.(SourceFile:60)
at android.support.v7.internal.app.AppCompatViewInflater.createView(SourceFile:101)
at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(SourceFile:966)
at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(SourceFile:44)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:725)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at eu.baroncelli.oraritrenitalia.mainactivity.AlertDialogFragment.onCreateView(SourceFile:62)
at android.support.v4.app.Fragment.performCreateView(SourceFile:1962)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1026)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1207)
at android.support.v4.app.BackStackRecord.run(SourceFile:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(SourceFile:1572)
at android.support.v4.app.FragmentManagerImpl$1.run(SourceFile:493)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

According to this your proguard setup should contain the following rules if you're using appcompat-v7:
-keep public class android.support.v7.widget.** { *; }
-keep public class android.support.v7.internal.widget.** { *; }
-keep public class android.support.v7.internal.view.menu.** { *; }
-keep public class * extends android.support.v4.view.ActionProvider {
public <init>(android.content.Context);
}
This will also save you from trouble when using SearchView and other things I imagine.