Question 125120 in Android Studio Question posted in
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Android Studio – i cant link webview in main activity to content layout

here i try to add menu in my app screen , and when i run the app , its crash and show me this error :
@layout/activity_main does not contain a declaration with id webview

to understand my problem take a look to my code

activity layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
    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:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">



    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:itemIconTint="@drawable/tab"
        app:itemTextColor="@drawable/tab"
        app:headerLayout="@layout/nav_header"
        app:menu="@menu/menu" />

</androidx.drawerlayout.widget.DrawerLayout>

and this content layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <WebView
        tools:context=".MainActivity"
        android:id="@+id/webview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">
    </WebView>

    <com.google.android.gms.ads.AdView
        xmlns:ads="http://schemas.android.com/apk/res-auto"
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        ads:adSize="SMART_BANNER"
        ads:adUnitId="ca-app-pub-3940256099942544/6300978111">
    </com.google.android.gms.ads.AdView>



</LinearLayout>

part of my code from main activity (because its so long) , the error show with this (R.id.webview)


public class MainActivity extends AppCompatActivity {

    LinearLayout LinearLayoutView;
    private WebView webView;
    private AdView mAdView;
    private InterstitialAd mInterstitialAd;
    DrawerLayout drawer_layout;
    NavigationView nav_view;
    ActionBarDrawerToggle drawerToggle;




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);




        drawer_layout = findViewById(R.id.drawer_layout);
        nav_view = findViewById(R.id.nav_view);
        drawerToggle = new ActionBarDrawerToggle(this,drawer_layout, R.string.open, R.string.close);
        drawer_layout.addDrawerListener(drawerToggle);
        drawerToggle.syncState();
       getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        nav_view.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {

                switch (item.getItemId())
                {

                    case R.id.nav_item01:
                    {

                        Toast.makeText(MainActivity.this, "this nav item 1 ", Toast.LENGTH_LONG).show();
                    }

                    case R.id.nav_item02:
                    {

                        Toast.makeText(MainActivity.this, "this nav item 1 ", Toast.LENGTH_LONG).show();
                    }
                    case R.id.nav_item03:
                    {

                        Toast.makeText(MainActivity.this, "this nav item 1 ", Toast.LENGTH_LONG).show();
                    }
                    case R.id.nav_item04:
                    {

                        Toast.makeText(MainActivity.this, "this nav item 1 ", Toast.LENGTH_LONG).show();
                    }
                    case R.id.nav_item05:
                    {

                        Toast.makeText(MainActivity.this, "this nav item 1 ", Toast.LENGTH_LONG).show();
                    }
                    case R.id.nav_item06:
                    {

                        Toast.makeText(MainActivity.this, "this nav item 1 ", Toast.LENGTH_LONG).show();
                    }
                    case R.id.nav_item07:
                    {

                        Toast.makeText(MainActivity.this, "this nav item 1 ", Toast.LENGTH_LONG).show();
                    }
                    case R.id.nav_share:
                    {
                    ShareApp();
                    }
                    case R.id.rateapp:
                    {

                        RateApp();
                    }
                    case R.id.moreapps:
                    {

                       MoreApps();
                    }

                }
                return false;
            }
        });



            WebView webView = findViewById(R.id.webview);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new WebViewClient());
webviewscreen();

        WebSettings webSettings = webView.getSettings();


        webSettings.setJavaScriptEnabled(true);
        webSettings.setSaveFormData(false);
        webSettings.setSupportZoom(false);
        webSettings.setGeolocationEnabled(true);
        webSettings.setAllowFileAccess(true);
        webSettings.setAllowFileAccessFromFileURLs(true);
        webSettings.setAllowUniversalAccessFromFileURLs(true);
        webSettings.setUseWideViewPort(true);
        webSettings.setDomStorageEnabled(true);

        webView.setHapticFeedbackEnabled(false);

errors :


D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: app.example.webview, PID: 8114
    java.lang.RuntimeException: Unable to start activity ComponentInfo{app.example.webview/app.example.webview.MainActivity}: android.view.InflateException: Binary XML file line #23: Binary XML file line #23: Error inflating class com.google.android.material.navigation.NavigationView
        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 #23: Binary XML file line #23: Error inflating class com.google.android.material.navigation.NavigationView
     Caused by: android.view.InflateException: Binary XML file line #23: Error inflating class com.google.android.material.navigation.NavigationView
     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.inflate(LayoutInflater.java:515)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:775)
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:197)
        at app.example.webview**strong text**.MainActivity.onCreate(MainActivity.java:58)
        at android.app.Activity.performCreate(Activity.java:7009)
        at android.app.Activity.performCreate(Activity.java:7000)
        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: android.content.res.Resources$NotFoundException: Can't find ColorStateList from drawable resource ID #0x7f0700f6
        at android.content.res.ResourcesImpl.loadColorStateList(ResourcesImpl.java:1013)
        at android.content.res.Resources.getColorStateList(Resources.java:1021)
        at androidx.core.content.res.ResourcesCompat$Api23Impl.getColorStateList(ResourcesCompat.java:688)
        at androidx.core.content.res.ResourcesCompat.getColorStateList(ResourcesCompat.java:244)
        at androidx.core.content.ContextCompat.getColorStateList(ContextCompat.java:558)
        at androidx.appcompat.content.res.AppCompatResources.getColorStateList(AppCompatResources.java:48)
        at androidx.appcompat.widget.TintTypedArray.getColorStateList(TintTypedArray.java:179)
        at com.google.android.material.navigation.NavigationView.<init>(NavigationView.java:213)
E/AndroidRuntime:     at com.google.android.material.navigation.NavigationView.<init>(NavigationView.java:141)
             26 more

i watch many videos and they do exactly what I do , and its work with them

Tags:

3

Answers


  1. 0

    In your MainActivity class, you are setting the view as:

      setContentView(R.layout.activity_main);

    However, your layout file activity_main.xml does not contain a WebView widget and hence you are getting that error.

    Please try moving/creating the WebView widget inside the activity_main.xml file in order to resolve the error.

    Please let me know in case you need anything else.

    Hope that helps.

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  2. 0

    In your activity_main.xml file you have to add include tag like this

    <androidx.drawerlayout.widget.DrawerLayout
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:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
tools:ignore="HardcodedText">

<include
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    layout="your content layout like this @layout/content" />

<com.google.android.material.navigation.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:menu="@menu/navigation_menu" />

</androidx.drawerlayout.widget.DrawerLayout>

    this include tag helps the MainActivity.java to find (R.id.webview) in the class and due to this include tag android.view.InflateException will resolve and your app run smoothly.

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  3. 0

    From your log stacktrace, it indicates there is a problem with your NavigationView:

    java.lang.RuntimeException: Unable to start activity ComponentInfo{app.example.webview/app.example.webview.MainActivity}: android.view.InflateException: Binary XML file line #23: Binary XML file line #23: Error inflating class com.google.android.material.navigation.NavigationView

    And the main cause should be:

    Caused by: android.content.res.Resources$NotFoundException: Can’t find ColorStateList from drawable resource ID #0x7f0700f6

    So there should be something wrong with your @drawable/tab:

    <com.google.android.material.navigation.NavigationView
        ...
        app:itemIconTint="@drawable/tab"
        app:itemTextColor="@drawable/tab"
        ... />

    You should check if the value of @drawable/tab is properly defined.

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