java - Android 的 webview 显示空白屏幕

Question

我正在尝试在 android 中为网站 localbestprice.com 创建一个 webview。

我是这个编程的新手。我尝试了很多方法，但它只显示空白屏幕。尝试了覆盖 true 和 false 的方法。该问题仍未解决。

我正在传递下面的代码。

list 文件

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

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<application
    android:allowBackup="true"
   android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.localbestprice.localbest.MainActivity">


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

</android.support.constraint.ConstraintLayout>

Java代码

public class MainActivity extends AppCompatActivity {

private WebView webView;

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

    webView = (WebView) findViewById(R.id.webView);

    webView.getSettings().setJavaScriptEnabled(true);

    webView.loadUrl("https://www.localbestprice.com");

}

public class myWebClient extends WebViewClient
{
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        super.onPageStarted(view, url, favicon);
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {

        view.loadUrl(url);
        return true;

    }

}

@Override
// This method is used to detect back button
public void onBackPressed() {
    if(webView.canGoBack()) {
        webView.goBack();
    } else {
        // Let the system handle the back button
        super.onBackPressed();
    }
}
}
}

Answer 1

在

之后使用此代码

webView.getSettings().setJavaScriptEnabled(true);

    webView.setWebChromeClient(new WebChromeClient());
    webView.setWebViewClient(new WebViewClient(){
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public void onPageFinished(WebView view, String url){
            super.onPageFinished(view, url);
            progressBar.setVisibility(View.GONE);
            webView.setVisibility(View.VISIBLE);
            webView.canGoForward();
        }

        @Override
        public void onReceivedError(WebView view, int errorCode,
                                    String description, String failingUrl){
            super.onReceivedError(view, errorCode, description, failingUrl);
            Snackbar.make(view, R.string.something_went_wrong,2000).show();
        }
    });
    webView.loadUrl("https://www.localbestprice.com"));

并删除这个myWebClient类