Google 登录无法正常工作 android webview 应用程序 [英] Google sign in not working android webview app

问题描述

我已经使用 webview 创建了 Android 应用程序.尝试使用 Google 登录时，它首先要求输入用户名和密码，然后显示消息请关闭此窗口"的屏幕 &什么都没发生.

I've created Android App with the webview. When trying to sign in with Google, it first asks for username & password, then the screen with the message 'Please close this window' shows up & nothing happens.

此外，用户还没有登录.

Also, the user is not logged in.

附言这在我的移动网站上非常有效，该网站本身已移植到 Android Webview 应用程序.谁能告诉为什么这不起作用?我对 Android 完全陌生.

P.S. This works absolutely fine with my mobile website which itself is ported to Android Webview App. Can anyone tell why that doesn't work? I'm completely new to Android.

推荐答案

webview 中的两件事会导致 google 登录出现问题.

Two things in webview create problems in google sign-in.

1. Google 现在不允许我们从 webview 登录.因此，需要自定义 User-Agent.
   
2. webview 中的弹出窗口处理不合适.因此，需要一个函数覆盖.
   

在 WebChromeClient 中使用自定义 User-Agent 和 AlertDialog 来处理弹出窗口为我解决了这些问题.

Using custom User-Agent and an AlertDialog in WebChromeClient to handle popups solve the issues for me.

完整代码如下:

Here's the full code:

public class MainActivity extends AppCompatActivity {

    private Context contextPop;
    private WebView webViewPop;
    private AlertDialog builder;

    private String url = "https://example.com";

    private WebView webView;
    private String userAgent;

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

        webView = findViewById(R.id.webView);
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                // to continue loading a given URL in the current WebView.
                // needed to handle redirects.
                return false;
            }
        });
        webView.loadUrl(url);

        WebSettings webSettings = webView.getSettings();
        // Set User Agent
        //userAgent = System.getProperty("http.agent");
        // the upper line sometimes causes "403: disallowed user agent error"
        userAgent = "";
        webSettings.setUserAgentString(userAgent + "Your App Info/Version");

        // Enable Cookies
        CookieManager.getInstance().setAcceptCookie(true);
        if(android.os.Build.VERSION.SDK_INT >= 21)
            CookieManager.getInstance().setAcceptThirdPartyCookies(webView, true);

        // WebView Tweaks
        webSettings.setJavaScriptEnabled(true);
        webSettings.setRenderPriority(WebSettings.RenderPriority.HIGH);
        webSettings.setCacheMode(WebSettings.LOAD_DEFAULT);
        webSettings.setAppCacheEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
        webSettings.setUseWideViewPort(true);
        webSettings.setSaveFormData(true);
        webSettings.setEnableSmoothTransition(true);
        webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

        // Handle Popups
        webView.setWebChromeClient(new CustomChromeClient());
        webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
        webSettings.setSupportMultipleWindows(true);
        contextPop = this.getApplicationContext();
    }

    @Override
    public void onBackPressed() {

        if(webView.canGoBack()) {
            webView.goBack();
        }
        else {
            //super.onBackPressed();
            // Terminate the app
            finishAffinity();
            System.exit(0);
        }
    }

    class CustomChromeClient extends WebChromeClient {

        @Override
        public boolean onCreateWindow(WebView view, boolean isDialog,
                                      boolean isUserGesture, Message resultMsg) {

            webViewPop = new WebView(contextPop);
            webViewPop.setWebViewClient(new WebViewClient() {
                @Override
                public boolean shouldOverrideUrlLoading(WebView view, String url) {
                    // to continue loading a given URL in the current WebView.
                    // needed to handle redirects.
                    return false;
                }
            });

            // Enable Cookies
            CookieManager cookieManager = CookieManager.getInstance();
            cookieManager.setAcceptCookie(true);
            if(android.os.Build.VERSION.SDK_INT >= 21) {
                cookieManager.setAcceptThirdPartyCookies(webViewPop, true);
                cookieManager.setAcceptThirdPartyCookies(webView, true);
            }

            WebSettings popSettings = webViewPop.getSettings();
            // WebView tweaks for popups
            webViewPop.setVerticalScrollBarEnabled(false);
            webViewPop.setHorizontalScrollBarEnabled(false);
            popSettings.setJavaScriptEnabled(true);
            popSettings.setSaveFormData(true);
            popSettings.setEnableSmoothTransition(true);
            // Set User Agent
            popSettings.setUserAgentString(userAgent + "Your App Info/Version");
            // to support content re-layout for redirects
            popSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);

            // handle new popups
            webViewPop.setWebChromeClient(new CustomChromeClient());

            // set the WebView as the AlertDialog.Builder’s view
            builder = new AlertDialog.Builder(MainActivity.this, AlertDialog.THEME_DEVICE_DEFAULT_LIGHT).create();
            builder.setTitle("");
            builder.setView(webViewPop);

            builder.setButton("Close", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    webViewPop.destroy();
                    dialog.dismiss();
                }
            });

            builder.show();
            builder.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);

            WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;
            transport.setWebView(webViewPop);
            resultMsg.sendToTarget();

            return true;
        }

        @Override
        public void onCloseWindow(WebView window) {
            //Toast.makeText(contextPop,"onCloseWindow called",Toast.LENGTH_SHORT).show();
            try {
                webViewPop.destroy();
            } catch (Exception e) {
                Log.d("Webview Destroy Error: ", e.getStackTrace().toString());
            }

            try {
                builder.dismiss();
            } catch (Exception e) {
                Log.d("Builder Dismiss Error: ", e.getStackTrace().toString());
            }

        }
    }
}

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