android - webview 应用程序以空白屏幕打开

Question

我创建了 webview 应用程序，该应用程序以空白屏幕打开。即使使用 swipetorefresh 重新加载网页，它也不会加载任何内容

MainActivity.java

package app.freeairdrop.io;

import ...

public class MainActivity extends Activity{
    private ProgressBar progressBar;
    private WebView webView;
    private SwipeRefreshLayout mySwipeRefreshLayout;
    @SuppressLint("SetJavaScriptEnabled")
    @Override
    public void onCreate(Bundle savedInstanceState) {


        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
        progressBar.setMax(100);
        webView = (WebView) findViewById(R.id.webView);
        webView.setWebViewClient(new WebViewClientDemo());
        webView.setWebChromeClient(new WebChromeClientDemo());
        webView.getSettings().setJavaScriptEnabled(true);

        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        webView.getSettings().setPluginState(WebSettings.PluginState.ON);
       // webView.getSettings().setMediaPlaybackRequiresUserGesture(false);

        webView.loadUrl("https://freeairdrop.io/");

        mySwipeRefreshLayout = (SwipeRefreshLayout) this.findViewById(R.id.swipeContainer);


        mySwipeRefreshLayout.setOnRefreshListener(
                new SwipeRefreshLayout.OnRefreshListener() {
                    @Override
                    public void onRefresh() {
                        webView.reload();
                        mySwipeRefreshLayout.setRefreshing(false);
                    }
                }
        );

        // ATTENTION: This was auto-generated to handle app links.
        Intent appLinkIntent = getIntent();
        String appLinkAction = appLinkIntent.getAction();
        Uri appLinkData = appLinkIntent.getData();
        webView.loadUrl(String.valueOf(appLinkData));
    }



    private class WebViewClientDemo extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            Uri uri = Uri.parse(url);
            if (uri.getHost() != null && (url.startsWith("https://freeairdrop.io/") || url.startsWith("https://www.freeairdrop.io/"))) {
                return false;
            }

            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            view.getContext().startActivity(intent);
            return true;
        }
        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
            progressBar.setVisibility(View.GONE);
            progressBar.setProgress(100);
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
            progressBar.setVisibility(View.VISIBLE);
            progressBar.setProgress(0);
        }
    }


    private class WebChromeClientDemo extends WebChromeClient {
        public void onProgressChanged(WebView view, int progress) {
            progressBar.setProgress(progress);
        }
    }
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
            webView.goBack();
            return true;
        }
        else {
//            finish();
        }
        return super.onKeyDown(keyCode, event);
    }




    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        return true;
    }

    @Override
    // This method is used to detect back button
    public void onBackPressed() {
        if (this.webView.canGoBack()) {
            this.webView.goBack();
            return;
        }
        Builder dialog = new Builder(this);
//        dialog.setTitle((CharSequence) "Exit App");
        dialog.setMessage((CharSequence) "Do You Want To Exit The App ?");
        dialog.setPositiveButton((CharSequence) "YES", (OnClickListener) new OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                MainActivity.this.finish();
            }
        });
        dialog.setCancelable(false);
        dialog.setNegativeButton((CharSequence) "CANCEL", (OnClickListener) new OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        }).show();
    }
} 

AndroidManifest.xml 文件：

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

    >


    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"  />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

    <application
        android:appCategory="productivity"
        android:hardwareAccelerated="true"
        android:allowBackup="true"
        android:fullBackupContent="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        tools:ignore="GoogleAppIndexingWarning">
        <activity
            android:name="app.freeairdrop.io.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <intent-filter android:autoVerify="true">
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data
                    android:scheme="https"
                    android:host="freeairdrop.io" />
            </intent-filter>
        </activity>
    </application>

</manifest>

应用程序的深层链接运行良好，只是应用程序每次打开时都会出现空白屏幕。

标签： androidandroid-webview

Answer 1

尝试

webView.getSettings().setDomStorageEnabled(true)