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androidx.appcompat.widget.LinearLayoutCompat cannot be cast to android.widget.LinearLayout

I have an Android app. This app has ten activities, the first activity of which is the Splash Screen that is run thats After one or two seconds, the app closes and does not enter the second activity The error I get is:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 4538
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.IntroPage}: java.lang.ClassCastException: androidx.appcompat.widget.LinearLayoutCompat cannot be cast to android.widget.LinearLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.ClassCastException: androidx.appcompat.widget.LinearLayoutCompat cannot be cast to android.widget.LinearLayout
at com.example.myapplication.IntroPage.onCreate(IntroPage.java:45)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6119) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
thats my xml splash screen code:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".SplashScreen"
android:background="#color/White">
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/img_gif"
android:layout_width="match_parent"
android:layout_height="289dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="38dp"
android:src="#drawable/ic_profile"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.296" />
<androidx.core.widget.ContentLoadingProgressBar
android:id="#+id/progress"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginTop="4dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.005"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.github.ybq.android.spinkit.SpinKitView
android:id="#+id/spin_kit"
style="#style/SpinKitView.WanderingCubes"
android:layout_width="60dp"
android:layout_height="49dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="36dp"
android:layout_marginRight="8dp"
app:SpinKit_Color="#color/orange"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/img_gif"
app:layout_constraintVertical_bias="0.254" />
<TextView
android:id="#+id/textView2"
android:layout_width="135dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginTop="8dp"
android:layout_marginBottom="2dp"
android:gravity="center"
android:text="#string/powerd_by_maede"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/spin_kit"
app:layout_constraintVertical_bias="0.48"
android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
thats my xml for sec activity:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="#9bfa5e">
<androidx.viewpager.widget.ViewPager
android:id="#+id/viewpager"
android:layout_width="0dp"
android:layout_height="435dp"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
app:layout_constraintBottom_toTopOf="#+id/layoutDots"
app:layout_constraintRight_toRightOf="#+id/layoutDots"
tools:layout_constraintLeft_creator="1"
android:layout_marginBottom="8dp"
app:layout_constraintLeft_toRightOf="#+id/layoutDots" />
<androidx.appcompat.widget.LinearLayoutCompat
android:id="#+id/layoutDots"
android:layout_width="0dp"
android:layout_height="0dp"
android:gravity="center"
android:orientation="horizontal"
tools:layout_constraintBottom_creator="1"
app:layout_constraintBottom_toBottomOf="parent"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent" />
<View
android:layout_width="0dp"
android:layout_height="1dp"
android:alpha=".5"
android:background="#222"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
app:layout_constraintBottom_toTopOf="#+id/btn_next"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
app:layout_constraintRight_toRightOf="parent"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="#+id/btn_next" />
<Button
android:id="#+id/btn_next"
android:layout_width="88dp"
android:layout_height="50dp"
android:background="#drawable/chevron_right"
android:textColor="#222"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="1"
app:layout_constraintLeft_toRightOf="#+id/btn_skip"
app:layout_constraintRight_toRightOf="parent"
tools:layout_constraintBottom_creator="1"
tools:layout_constraintLeft_creator="1" />
<Button
android:id="#+id/btn_skip"
android:layout_width="88dp"
android:layout_height="48dp"
android:layout_marginBottom="1dp"
android:background="#null"
android:text="رد کردن"
android:textColor="#ffffff"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="#+id/layoutDots"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0"
tools:layout_constraintBottom_creator="1"
tools:layout_constraintLeft_creator="1" />
</androidx.constraintlayout.widget.ConstraintLayout>
thats my splash screen activity:
package com.example.myapplication;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import androidx.appcompat.app.AppCompatActivity;
import android.view.WindowManager;
import android.widget.ProgressBar;
import com.github.ybq.android.spinkit.sprite.Sprite;
import com.github.ybq.android.spinkit.style.DoubleBounce;
import java.util.Calendar;
public class SplashScreen extends AppCompatActivity {
SharedPreferences sharedP;
boolean show_intropage=true;
Calendar taqwim = Calendar.getInstance();
int today,date_mod;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash_screen);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
//----progress---------------
ProgressBar progressBar = findViewById(R.id.progress);
Sprite doubleBounce = new DoubleBounce();
progressBar.setIndeterminateDrawable(doubleBounce);
today = taqwim.get(Calendar.DAY_OF_YEAR);
sharedP = getSharedPreferences(Items.SETTINGS, Context.MODE_PRIVATE);
show_intropage = sharedP.getBoolean(Items.INTROPAGE,true);
sharedP.edit().putInt(Items.TODAY, today).apply();
if (show_intropage){
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Intent Myintent = new Intent(SplashScreen.this,IntroPage.class);
startActivity(Myintent);
finish();
}
},4000);
date_mod = taqwim.get(Calendar.DAY_OF_YEAR);
// Toast.makeText(this, day+"", Toast.LENGTH_SHORT).show();
sharedP.edit().putInt(Items.DATE_MODIFIED, date_mod).apply();
}else {
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Intent Myintent = new Intent(SplashScreen.this,MainActivity.class);
startActivity(Myintent);
finish();
}
},4000);
}
}
}
thats my sec activity:
package com.example.myapplication;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import androidx.viewpager.widget.PagerAdapter;
import androidx.viewpager.widget.ViewPager;
import androidx.appcompat.app.AppCompatActivity;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.ToxicBakery.viewpager.transforms.RotateUpTransformer;
public class IntroPage extends AppCompatActivity {
ViewPager MyviewPager;
Button btnSkip, btnNext;
private LinearLayout dotsLayout;
private TextView[] dots;
SharedPreferences sharedP;
int [] layout = {R.layout.slide_01,R.layout.slide_02,R.layout.slide_04};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_intro_page);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
MyviewPager = (ViewPager) findViewById(R.id.viewpager);
btnSkip = (Button) findViewById(R.id.btn_skip);
btnNext = (Button) findViewById(R.id.btn_next);
dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
MyviewPager.setAdapter(new ViewP());
MyviewPager.setPageTransformer(true, new RotateUpTransformer());
sharedP = getSharedPreferences(Items.SETTINGS, Context.MODE_PRIVATE);
addBottomDots(0);
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int Tedad_items = MyviewPager.getCurrentItem()+1;
if (Tedad_items < layout.length) {
MyviewPager.setCurrentItem(MyviewPager.getCurrentItem()+1);
} else {
startActivity(new Intent(IntroPage.this,MainActivity.class));
finish();
}
}
});
btnSkip.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(IntroPage.this,MainActivity.class));
finish();
}
});
MyviewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
addBottomDots(position);
if (position == layout.length - 1) {
// btnNext.setText("Start");
btnNext.setBackgroundResource(R.drawable.check);
btnSkip.setVisibility(View.GONE);
} else {
// btnNext.setText("Next");
btnNext.setBackgroundResource(R.drawable.chevron_right);
btnSkip.setVisibility(View.VISIBLE);
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
}
public class ViewP extends PagerAdapter {
#Override
public Object instantiateItem(ViewGroup container, int position) {
View view= LayoutInflater.from(IntroPage.this).inflate(layout[position],container,false);
container.addView(view);
return view;
}
#Override
public int getCount() {
return layout.length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
// View view = (View)object;
container.removeView((View) object);
}
}
private void addBottomDots(int currentPage) {
dots = new TextView[layout.length];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
dotsLayout.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[0]);
dotsLayout.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[0]);
}
}

The issue is here:
dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
In your layout you are using a LinearLayoutCompat.
Use:
LinearLayoutCompat dotsLayout;
dotsLayout = findViewById(R.id.layoutDots);

Android Studio can't get button to call

The button works when its alone without the WebView but once I add that only the WebView works and clicking the button does nothing.
Here's my MainActivty.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myWebView = (WebView) findViewById(R.id.myWebView);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("http://");
}
Intent intentCall;
public void onClick(View v){
intentCall.setAction("android.intent.action.CALL");
intentCall.setData(Uri.parse("tel:"));
startActivity(intentCall);
finish();
}}
Here's my Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.yellowribbon.evindrake.yellowribbonv3" >
<uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Activity_Main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="org.yellowribbon.evindrake.yellowribbonv3.MainActivity">
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/myWebView"
android:layout_alignParentBottom="true" />
<Button
android:text="#string/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>

Push-buttons can be pressed, or clicked, by the user to perform an action!
A typical use of a push-button in an activity would be the following:
.
public class MyActivity extends Activity {
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.content_layout_id);
final Button button = (Button) findViewById(R.id.button_id);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
}
});
}
}
However, instead of applying an OnClickListener to the button in your activity, you can assign a method to your button in the XML layout, using the android:onClick. You are trying to achieve that without this attribute!
Now, when a user clicks the button, the Android system calls the activity's myClickMethod(View)(that i created) method. In order for this to work, the method must be public and accept a View as its only parameter. For example:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="myClickMethod"
android:text="button" />
and in code
public void myClickMethod(View view) {
// Perform action on click after identify the view
}
Also you are getting a null pointer because of Intent intentCall
use your onClick(View v) like below,
public void onClick(View v) {
String number = "18002738255";
Uri call = Uri.parse("tel:" + number);
Intent surf = new Intent(Intent.ACTION_CALL, call);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
return;
}
startActivity(surf);
}

Add code to inside button component in activity_main.xml file
android:onClick="onClick"

INVISIBLE button after taking a picture from camera

this is an example to take the picture.
Why button 3 does not INVISIBLE after shooting?
What is the correct way to hide the button after taking a picture?
Please help with thanks.
Note: I TRY IN galaxy 3 mini (18190) >> does not work
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
public class MainActivity extends ActionBarActivity {
private static final int ACTIVITY_START_CAMER_APP = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void showButton1(View view) {
EditText editText1 = (EditText) findViewById(R.id.editText);
editText1.setText("1", TextView.BufferType.EDITABLE);
showhideButton();
}
public void hideButton2(View view) {
EditText editText1 = (EditText) findViewById(R.id.editText);
editText1.setText("0", TextView.BufferType.EDITABLE);
showhideButton();
}
public void showhideButton0(View view) {
showhideButton();
}
public void showhideButton() {
EditText editText1 = (EditText) findViewById(R.id.editText);
Button button3 = (Button) findViewById(R.id.button3);
int val = Integer.parseInt(editText1.getText().toString().trim());
if (val == 1) {
Toast.makeText(this, "hide Button3", Toast.LENGTH_SHORT).show();
button3.setVisibility(View.INVISIBLE);}
else if (val ==0) { Toast.makeText(this, "show Button3", Toast.LENGTH_SHORT).show();
button3.setVisibility(View.VISIBLE);
}
}
public void takePhoto(View view) throws IOException {
Intent callCameraApplicationIntent = new Intent();
callCameraApplicationIntent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException e) {
e.printStackTrace();
}
callCameraApplicationIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
startActivityForResult(callCameraApplicationIntent, ACTIVITY_START_CAMER_APP);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
EditText txt4 = (EditText) findViewById(R.id.editText);
if (requestCode == ACTIVITY_START_CAMER_APP && resultCode == RESULT_OK) {
txt4.setText("1", TextView.BufferType.EDITABLE);
}
else { return;}
showhideButton();
}
File createImageFile() throws IOException {
File folder = new File(Environment.getExternalStorageDirectory() + "/image1");
boolean success = true;
if (!folder.exists()) {
success = folder.mkdir();
}
File folder2 = new File(Environment.getExternalStorageDirectory() + "/image1/Original_Images");
boolean success2 = true;
if (!folder2.exists()) {
success2 = folder2.mkdir();
}
File image = new File(Environment.getExternalStorageDirectory() + "/image1/Original_Images/1.jpg");
return image;
}
}
<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:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity">
<TextView android:text="#string/hello_world" android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="show Button3"
android:id="#+id/button1"
android:layout_alignParentBottom="true"
android:layout_marginBottom="122dp"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:onClick="hideButton2" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="hide Button3"
android:id="#+id/button2"
android:layout_above="#+id/button1"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="showButton1" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button3"
android:id="#+id/button3"
android:layout_below="#+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/editText"
android:layout_below="#+id/button3"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="58dp"
android:inputType="number"
android:text="0" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="takePhoto"
android:id="#+id/button"
android:onClick="takePhoto"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="showhideButton"
android:id="#+id/button4"
android:onClick="showhideButton0"
android:layout_above="#+id/button"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>

I/chromium﹕ [INFO:CONSOLE(1)] "Uncaught ReferenceError: callJS is not defined"

I'm getting the following error in Android Studio logcat:
I/chromium﹕ [INFO:CONSOLE(1)] "Uncaught ReferenceError: callJS is not defined"
I have researched on stackoverflow and tried the suggested answers on similar post with no luck. here
I'm trying to execute javascript from a local html file that is loaded into a WebChromeClient by clicking on a android button. The code is taken from the Chapter 10 example in The Pragmatic Programmers "Hello Android Introducing Google's Mobile development Platform" fourth Edition book.
index.html
<html>
<head>
<script language="JavaScript">
function callJS(arg){
document.getElementById('replaceMe').innerHTML = arg;
{
</script>
</head>
<body>
<h2>WebView</h2>
<p>
Display JavaScript alert
</p>
<p>
Call Android from JavaScript
</p>
<p id="replaceMe"></p>
</body>
</html>
MainActivity
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.JavascriptInterface;
import android.webkit.JsResult;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final String TAG = "LocalBrowser";
private final Handler handler = new Handler();
private WebView webView;
private TextView textView;
private Button button;
/** Object exposed to JavaScript */
private class AndroidBridge {
#JavascriptInterface // Required in Android 4.2+
public void callAndroid(final String arg) { // must be final
handler.post(new Runnable() {
public void run() {
Log.d(TAG, "callAndroid(" + arg + ")");
textView.setText(arg);
}
});
}
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find the Android controls on the screen
webView = (WebView) findViewById(R.id.web_view);
textView = (TextView) findViewById(R.id.text_view);
button = (Button) findViewById(R.id.button);
// Rest of onCreate follows...
// Turn on JavaScript in the embedded browser
webView.getSettings().setJavaScriptEnabled(true);
// Expose a Java object to JavaScript in the browser
webView.addJavascriptInterface(new AndroidBridge(),
"android");
// Set up a function to be called when JavaScript tries
// to open an alert window
webView.setWebChromeClient(new WebChromeClient() {
#Override
public boolean onJsAlert(final WebView view,
final String url, final String message,
JsResult result) {
Log.d(TAG, "onJsAlert(" + view + ", " + url + ", "
+ message + ", " + result + ")");
Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
result.confirm();
return true; // I handled it
}
});
// Load the web page from a local asset
webView.loadUrl("file:///android_asset/index.html");
// This function will be called when the user presses the
// button on the Android side
button.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
Log.d(TAG, "onClick(" + view + ")");
if (android.os.Build.VERSION.SDK_INT < 19) {
webView.loadUrl("javascript:callJS('Hello from Android')");
}else{
webView.evaluateJavascript("javascript:callJS('Hello from Android')", null);
}
}
});
}
}
activity_main
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<WebView
android:id="#+id/web_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1.0"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_weight="1.0"
android:padding="5sp">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="24sp"
android:text="#string/textView"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:text="#string/call_javascript_from_android"
android:textSize="18sp"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/text_view"
android:textSize="18sp"/>
</LinearLayout>
</LinearLayout>
Any help is greatly appreciated! Thanks in advance!

Google tv emulator doesnt show my website propertly

I did a web to show different videos in HTML5,and the web works.
Now I would like to do a google tv app and show this web and work with it.
I try with a webView component but the part with javascript doesnt work and show like a plain text($function...) and the rest appear without any format.
This is my Activity:
public class Test extends Activity {
WebView mWebView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.vid);
mWebView = (WebView) findViewById(R.id.web);
mWebView.getSettings().setJavaScriptEnabled(true);
if (savedInstanceState != null) {
mWebView.restoreState(savedInstanceState);
} else {
mWebView.loadUrl("http://192.168.2.103:8080/VirtualSTBJSF/vid.xhtml");
mWebView.setWebViewClient(new verMiWeb());
}
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mWebView.saveState(outState);
}
#Override
public void onStop() {
super.onStop();
mWebView.stopLoading();
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && mWebView.canGoBack()) {
mWebView.goBack();
}
return super.onKeyDown(keyCode, event);
}
}
class verMiWeb extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
and the layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<WebView
android:id="#+id/web"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
Any idea?
Thanks for the answers.