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Can't make http request in android

I am trying to make a simple android app that makes a request to google, the expected behavior that my app should make a connection to google and then stop, what I got this error
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 4431
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:414)
at android.view.View.performClick(View.java:7339)
at android.widget.TextView.performClick(TextView.java:14275)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
at android.view.View.performClickInternal(View.java:7305)
at android.view.View.access$3200(View.java:846)
at android.view.View$PerformClick.run(View.java:27787)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7078)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:409)
at android.view.View.performClick(View.java:7339) 
at android.widget.TextView.performClick(TextView.java:14275) 
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119) 
at android.view.View.performClickInternal(View.java:7305) 
at android.view.View.access$3200(View.java:846) 
at android.view.View$PerformClick.run(View.java:27787) 
at android.os.Handler.handleCallback(Handler.java:873) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:214) 
at android.app.ActivityThread.main(ActivityThread.java:7078) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964) 
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1513)
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:117)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:105)
at java.net.InetAddress.getAllByName(InetAddress.java:1154)
at com.android.okhttp.Dns$1.lookup(Dns.java:39)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:196)
at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:144)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:89)
at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:190)
at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:142)
at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:104)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:392)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:325)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:488)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:131)
at com.example.myapplication.HttpRequest.request(HttpRequest.java:25)
at com.example.myapplication.MainActivity.onClick(MainActivity.java:64)
at java.lang.reflect.Method.invoke(Native Method) 
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:409) 
at android.view.View.performClick(View.java:7339) 
at android.widget.TextView.performClick(TextView.java:14275) 
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119) 
at android.view.View.performClickInternal(View.java:7305) 
at android.view.View.access$3200(View.java:846) 
at android.view.View$PerformClick.run(View.java:27787) 
at android.os.Handler.handleCallback(Handler.java:873) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:214) 
at android.app.ActivityThread.main(ActivityThread.java:7078) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964) 
I am working on android studio 4.1.2 with API 30,I am running the app on my phone with android 9 Pie.
My app has one button that makes a request, the that being executed is right here:
public void onClick(View view) {
try {
URL url = new URL("http://www.google.com/");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.connect();
//do something
conn.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
I have tried solutions that I found on internet but nothing work,I tried to edit my AndroidManifest.xml and I ended with this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:networkSecurityConfig="#xml/network_security_config"
android:usesCleartextTraffic="true"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.MyApplication">
<activity android:name=".MainActivity2"></activity>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I created a file network_security_config.xml:
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<domain-config cleartextTrafficPermitted="true">
<domain includeSubdomains="true">google.com</domain>
</domain-config>
</network-security-config>
I am new to mobile development and I don't understand everything in the xml fils so maybe there is obvious mistake but I don't see it.
Thank you for your help.

According to your error log, your problem is you're attempting to connect to the internet on the main thread. Android does not allow you to setup an internet connection on the main thread because that would freeze up everything else while it makes the connection. You need to connect on a different thread.
EDIT: In light of AsyncTask being depreciated, the recommended alternatives appear to be using the interfaces contained in java.util.concurrent to make threads and/or threadpools or the coroutine libraries for Kotlin. Be sure to check the documentation and make a thread that establishes the connection in the background.

Android java.lang.RuntimeException: Parcelable encountered ClassNotFoundException reading a Serializable object

I'm trying to send the Serializable object from one application to another.
My android application has a serializable class
public class MyClass implements Serializable
and I then put one instance of it to the intent
MyClass myObject = new MyClass();
intent.putExtra("payItem", myObject);
intent.setAction("com.mypackage.some.action");
when I call startActiviy
startActivity(intent);
I got app crash
5-16 11:09:24.738 30673-30673/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: system:ui, PID: 30673
java.lang.RuntimeException: Unable to start activity ComponentInfo{android/com.android.internal.app.ResolverActivity}: java.lang.RuntimeException: Parcelable encountered ClassNotFoundException reading a Serializable object (name = com.mypackage.MyClass)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2955)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3030)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6938)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.RuntimeException: Parcelable encountered ClassNotFoundException reading a Serializable object (name = com.mypackage.MyClass)
at android.os.Parcel.readSerializable(Parcel.java:2956)
at android.os.Parcel.readValue(Parcel.java:2742)
at android.os.Parcel.readArrayMapInternal(Parcel.java:3058)
at android.os.BaseBundle.unparcel(BaseBundle.java:257)
at android.os.Bundle.getParcelable(Bundle.java:888)
at android.content.Intent.getParcelableExtra(Intent.java:7734)
at android.app.Activity.getReferrer(Activity.java:5398)
at com.android.internal.app.ResolverActivity.getReferrerPackageName(ResolverActivity.java:554)
at com.android.internal.app.ResolverActivity.onCreate(ResolverActivity.java:435)
at com.android.internal.app.ResolverActivity.onCreate(ResolverActivity.java:331)
at android.app.Activity.performCreate(Activity.java:7174)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2908)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3030) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696) 
at android.os.Handler.dispatchMessage(Handler.java:105) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6938) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) 
Caused by: java.lang.ClassNotFoundException: com.mypackage.MyClass
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:453)
at android.os.Parcel$2.resolveClass(Parcel.java:2942)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1616)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1354)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:374)
at android.os.Parcel.readSerializable(Parcel.java:2950)
at android.os.Parcel.readValue(Parcel.java:2742) 
at android.os.Parcel.readArrayMapInternal(Parcel.java:3058) 
at android.os.BaseBundle.unparcel(BaseBundle.java:257) 
at android.os.Bundle.getParcelable(Bundle.java:888) 
at android.content.Intent.getParcelableExtra(Intent.java:7734) 
at android.app.Activity.getReferrer(Activity.java:5398) 
at com.android.internal.app.ResolverActivity.getReferrerPackageName(ResolverActivity.java:554) 
at com.android.internal.app.ResolverActivity.onCreate(ResolverActivity.java:435) 
at com.android.internal.app.ResolverActivity.onCreate(ResolverActivity.java:331) 
at android.app.Activity.performCreate(Activity.java:7174) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2908) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3030) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696) 
at android.os.Handler.dispatchMessage(Handler.java:105) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6938) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) 
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.mypackage.MyClass" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/system/lib64, /system/vendor/lib64, /system/lib64, /system/vendor/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at java.lang.Class.classForName(Native Method) 
at java.lang.Class.forName(Class.java:453) 
at android.os.Parcel$2.resolveClass(Parcel.java:2942) 
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1616) 
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521) 
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1777) 
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1354) 
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:374) 
at android.os.Parcel.readSerializable(Parcel.java:2950) 
at android.os.Parcel.readValue(Parcel.java:2742) 
at android.os.Parcel.readArrayMapInternal(Parcel.java:3058) 
at android.os.BaseBundle.unparcel(BaseBundle.java:257) 
at android.os.Bundle.getParcelable(Bundle.java:888) 
at android.content.Intent.getParcelableExtra(Intent.java:7734) 
at android.app.Activity.getReferrer(Activity.java:5398) 
at com.android.internal.app.ResolverActivity.getReferrerPackageName(ResolverActivity.java:554) 
at com.android.internal.app.ResolverActivity.onCreate(ResolverActivity.java:435) 
at com.android.internal.app.ResolverActivity.onCreate(ResolverActivity.java:331) 
at android.app.Activity.performCreate(Activity.java:7174) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2908) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3030) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696) 
at android.os.Handler.dispatchMessage(Handler.java:105) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6938) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) 
Actually my phone has installed two applications with both register an activity
with the same action name
<activity
android:name="com.mypackage.MyActivity"
android:exported="true"
>
<intent-filter>
<action android:name="com.mypackage.some.action"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
I would expect a dialog shown to let me choose which activity should be started, but I just got the error above. If I uninstall one of the applications, no error occurs and it runs as expected.
My question is
Why the dialog is not shown
Is it the reason of the crash
What's the solution to avoid that error if the two applications are both installed

Virtual phone error : "App has stopped working"

I have the following github project
GITHUB file Project
Every time I run the app on a virtual phone through android studio it comes up with "App has stopped working". I have updated android studio.
The errors which keep arising in the logcat are as follow:
05.182 4961-4961/app.monmos E/AndroidRuntime: FATAL EXCEPTION: main
Process: app.monmos, PID: 4961
java.lang.RuntimeException: Unable to start activity ComponentInfo{app.monmos/app.monmos.MainActivity}: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class info.hoang8f.widget.FButton
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class info.hoang8f.widget.FButton
Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class info.hoang8f.widget.FButton
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at app.monmos.MainActivity.onCreate(MainActivity.java:19)
at android.app.Activity.performCreate(Activity.java:6999)
at android.app.Activity.performCreate(Activity.java:6990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.UnsupportedOperationException: Can't convert value at index 1 to color: type=0x5
at android.content.res.TypedArray.getColor(TypedArray.java:473)
at info.hoang8f.widget.FButton.parseAttrs(FButton.java:116)
at info.hoang8f.widget.FButton.<init>(FButton.java:52)
at java.lang.reflect.Constructor.newInstance0(Native Method) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:334) 
at android.view.LayoutInflater.createView(LayoutInflater.java:647) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:515) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287) 
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) 
at app.monmos.MainActivity.onCreate(MainActivity.java:19) 
at android.app.Activity.performCreate(Activity.java:6999) 
at android.app.Activity.performCreate(Activity.java:6990) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) 
at android.app.ActivityThread.-wrap11(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6494) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 
I have also updated the gradle version and still nothing is working.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/backgroundimage"
tools:context="app.monmos.Signin">
<LinearLayout
android:orientation="vertical"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/linearLayout2">
<com.rengwuxian.materialedittext.MaterialAutoCompleteTextView
android:id="#+id/edtphone"
android:hint ="Phone Number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text ="00000001"
android:textColorHint="#android:color/white"
android:textColor="#android:color/white"
android:textSize="34sp"
android:inputType="phone"
app:met_baseColor="#android:color/white"
app:met_floatingLabel="highlight"
app:met_primaryColor="#android:color/white"
app:met_singleLineEllipsis = "true"
/>
<com.rengwuxian.materialedittext.MaterialAutoCompleteTextView
android:id="#+id/edtPassword"
android:hint ="Password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text ="1234"
android:textColorHint="#android:color/white"
android:textColor="#android:color/white"
android:textSize="34sp"
android:inputType="phone"
app:met_baseColor="#android:color/white"
app:met_floatingLabel="highlight"
app:met_primaryColor="#android:color/white"
app:met_singleLineEllipsis = "true"
/>
</LinearLayout>
<info.hoang8f.widget.FButton
android:id="#+id/btnSignIn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_margin="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_weight="1"
android:text="Sign In"
android:textColor="#android:color/white"
app:buttonColor="#color/btsSignActive"
app:cornerRadius="4dp"
app:shadowColor="#android:color/black"
app:shadowEnabled="true"
app:shadowHeight="5dp" />
//Added grade file
</RelativeLayout>
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3' +
'.0.1'
classpath 'com.google.gms:google-services:3.1.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

You don't have maven set up in your project's gradle file. Your gradle file should look like this:
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.0.1'
}
}
allprojects {
repositories {
google()
jcenter()
maven { url "https://jitpack.io" }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

Error inflating class info.hoang8f.widget.FButton

Error Log:
10-26 12:22:33.144 26926-26926/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: ksmk.sahip.com.ecom, PID: 26926
java.lang.RuntimeException: Unable to start activity ComponentInfo{ksmk.sahip.com.ecom/ksmk.sahip.com.ecom.MainActivity}: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class info.hoang8f.widget.FButton
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
Caused by: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class info.hoang8f.widget.FButton
Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class info.hoang8f.widget.FButton
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:430)
at android.view.LayoutInflater.createView(LayoutInflater.java:645)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:787)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at ksmk.sahip.com.ecom.MainActivity.onCreate(MainActivity.java:36)
at android.app.Activity.performCreate(Activity.java:6662)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
Caused by: java.lang.UnsupportedOperationException: Can't convert value at index 1 to color: type=0x5
at android.content.res.TypedArray.getColor(TypedArray.java:463)
at info.hoang8f.widget.FButton.parseAttrs(FButton.java:116)
at info.hoang8f.widget.FButton.(FButton.java:52)
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:430)
at android.view.LayoutInflater.createView(LayoutInflater.java:645)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:787)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at ksmk.sahip.com.ecom.MainActivity.onCreate(MainActivity.java:36)
at android.app.Activity.performCreate(Activity.java:6662)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
10-26 12:22:33.692 1305-1305/? E/EGL_emulation: tid 1305: eglCreateSyncKHR(1901): error 0x3004 (EGL_BAD_ATTRIBUTE)

use this dependency this is will solve error
implementation 'com.github.jd-alexander:android-flat-button:v1.1'
use this in code for casting the button
Button btn_CreateNewVideo;
btn_CreateNewVideo = (FButton) findViewById(R.id.createnewvideo);

As of this time the problem occurs in android gradle plugin version 3.0.0. So just change the android gradle plugin version to 2.3.3. You can change it in build.gradle (Project level) file, like:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}

If you have updated your android studio version to 3.o then go to file -> Project Structure -> Project -> Change gradle plugin version to 2.3.0 and gradle version to 3.3
I hope this helps

Same Flat FButton theme can be found here:
Use the library as a dependency https://github.com/jd-alexander/android-flat-button
https://jitpack.io/#jd-alexander/android-flat-button/v1.1
dependencies {
implementation 'com.github.jd-alexander:android-flat-button:v1.1'
}

Another solution I have found
Change for:
Dependence {
implementation 'info.hoang8f:android-segmented:1.0.6'
}
or
You can change casting (FButton) to (Button) with same previous dependency

So, some time ago I've got the exactly same error 'cause my Android Studio Version is higher than the version for which info.hoang8f was implemented, so, step-by-step how to fix it:
In your build.gradle project:level add this line inside allprojects -> repositories: maven { url 'https://jitpack.io' }
In your build.gradle app:level add this line in dependencies: implementation 'com.github.jd-alexander:android-flat-button:v1.1'
Remove the implementation line of 'info.hoang8f...' and Clean Project;
Remember, this new implementation use fButtonColor, so, you need to change in your XML files app:buttonColor='#color/someColor' to: app:fButtonColor='#color/someColor'
Do not:
Change your Gradle Version, this can raise some implementation errors;

java.lang.NoSuchFieldError: No static field KL of type Lcom/google/android/gms/internal/zzsb$zzb

I'm trying to open a Camera Activity on my Android but I got this error when the Activity starts:
FATAL EXCEPTION: main
Process: bookreader.bookreader, PID: 19132
java.lang.NoSuchFieldError: No static field KL of type Lcom/google/android/gms/internal/zzsb$zzb; in class Lcom/google/android/gms/internal/zzsb; or its superclasses (declaration of 'com.google.android.gms.internal.zzsb' appears in /data/app/bookreader.bookreader-1/split_lib_dependencies_apk.apk:classes4.dex)
at com.google.android.gms.vision.text.internal.client.zze.zzcic(Unknown Source)
at com.google.android.gms.vision.text.internal.client.zze.<init>(Unknown Source)
at com.google.android.gms.vision.text.TextRecognizer$Builder.build(Unknown Source)
at bookreader.bookreader.CameraActivity.onCreate(CameraActivity.java:97)
at android.app.Activity.performCreate(Activity.java:6609)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1134)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3113)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3275)
at android.app.ActivityThread.access$1000(ActivityThread.java:218)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1744)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:7007)
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:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
I don't know how to solve it. In my Android Manifest, I have this:
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />

make sure everything is up to date inside your build.gradle
no such method/field/class error usually occur because of dependency version mismatch (obfuscated fields names may be different across versions)