我在Android Studio 2023中创建了一个webview应用程序，但它在手机上显示白屏

Question

我在 Android Studio 2023 中创建了一个 webview 应用程序，但它在手机上显示白屏。启用了 JavaScript，并且清单中有互联网权限。为什么不工作白页... MainActivity.java :

package com.cmf.deneme;

        import androidx.appcompat.app.AppCompatActivity;

        import android.os.Bundle;
        import android.webkit.WebView;
        import android.webkit.WebViewClient;
        import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

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

       WebView myWebView = findViewById(R.id.yen);

        // WebViewClient ekleyerek web sayfasını uygulamanızın içinde açın
        myWebView.setWebViewClient(new WebViewClient());

        myWebView.getSettings().setJavaScriptEnabled(true); // İhtiyaca bağlı, JavaScript'i etkinleştirmek istiyorsanız

        myWebView.loadUrl("http://www.example.com");
    }
}

activity_main.xml：

<?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"
        tools:context=".MainActivity">

<WebView
        android:id="@+id/yen"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
        android:allowBackup="true"
                android:dataExtractionRules="@xml/data_extraction_rules"
                android:fullBackupContent="@xml/backup_rules"
                android:icon="@mipmap/ic_launcher"
                android:label="@string/app_name"
                android:roundIcon="@mipmap/ic_launcher_round"
                android:supportsRtl="true"
                android:theme="@style/Theme.Deneme"
                tools:targetApi="31">
<activity
            android:name=".MainActivity"
                    android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

我尝试了一切让应用程序正常工作，但它仍然显示白屏

Answer 1

这是一个完整的示例，您可以考虑一下。

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {

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

        WebView myWebView = findViewById(R.id.web);

        // WebViewClient ekleyerek web sayfasını uygulamanızın içinde açın
        myWebView.setWebViewClient(new WebViewClient());

        myWebView.getSettings().setJavaScriptEnabled(true); // İhtiyaca bağlı, JavaScript'i etkinleştirmek istiyorsanız

        myWebView.loadUrl("http://www.google.com");

    }
}

activity_main.xml

<?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"
    tools:context=".MainActivity">

    <WebView
        android:id="@+id/web"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:usesCleartextTraffic="true"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Webview"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

快乐编码！！