AndroidStudio：在webview上暫停和恢復會話

有沒有辦法讓用戶在重新啟動后保持登錄狀態而不在本地保存用戶名和密碼？。我只想在應用程式關閉時暫停會話，然后在打開時恢復會話。

兩個都試過：

    myWebView.getSettings().setDomStorageEnabled(true);
    myWebView.getSettings().setAppCacheEnabled(true);

還嘗試了 CookieManager 并設法做我想做的事，但由于某種原因，它停止作業并在應用程式退出時不斷注銷用戶（我還是個新手，我不知道發生了什么，無法修復它）。所以我試圖找到一種不同的方法來做到這一點。

我的 MainActivity.java：

public class MainActivity extends AppCompatActivity {

public DrawerLayout dLayout;
private WebView myWebView;
public ActionBarDrawerToggle actionBarDrawerToggle;

public void setActionBarTitle(String title) {
    getSupportActionBar().setTitle(title);
}

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

    //CREATE A FOLDER
    File file = this.getBaseContext().getExternalFilesDir("downloads");
    if (!file.exists())
        file.mkdir();
    setNavigationDrawer(); // call method
    dLayout = findViewById(R.id.my_drawer_layout);
    actionBarDrawerToggle = new ActionBarDrawerToggle(this, dLayout, R.string.nav_open, R.string.nav_close);

    dLayout.addDrawerListener(actionBarDrawerToggle);
    actionBarDrawerToggle.syncState();

    // to make the Navigation drawer icon always appear on the action bar
    Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
    myWebView = findViewById(R.id.activity_main_webview);
    WebSettings webSettings = myWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    myWebView.getSettings().setDomStorageEnabled(true);
    myWebView.getSettings().setAppCacheEnabled(true);
    myWebView.setWebChromeClient(new WebChromeClient());

    String url = "http://192.168.43.105/public_html/central/updates.php";
    myWebView.loadUrl(url);
    myWebView.setWebViewClient(new WebViewClient());
    myWebView.setWebViewClient(new WebViewClient() {
        public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl) {
            Toast.makeText(MainActivity.this, "Oh no! "   description, Toast.LENGTH_SHORT).show();

        }

        public void onPageFinished(WebView webView, String url) {
            CookieManager.getInstance().flush();
        }


    });
    myWebView.getSettings().setSupportZoom(true);
    myWebView.getSettings().setBuiltInZoomControls(true);
    myWebView.getSettings().setDisplayZoomControls(false);
    myWebView.getSettings().setUseWideViewPort(false);

}

uj5u.com熱心網友回復：

這是我使用的作業代碼。試試這些。

 /*Webview settings.*/

public static String DATABASES_SUB_FOLDER = "/databases";

    public void setWebSettings(WebSettings webSettings) {
        this.webSettings = webSettings;
        /*Accept Cookie*/
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.setAcceptCookie(true);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            cookieManager.setAcceptThirdPartyCookies(webview, true);
        }
        final String filesDir = getFilesDir().getPath();
        final String databaseDir = filesDir.substring(0, filesDir.lastIndexOf("/"))   DATABASES_SUB_FOLDER;

        webSettings.setBuiltInZoomControls(true);
        webSettings.setDisplayZoomControls(false);
        webSettings.setJavaScriptEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webSettings.setPluginState(WebSettings.PluginState.OFF);
        webSettings.setLoadWithOverviewMode(true);
        webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
        //   webSettings.setUseWideViewPort(true);
//        webSettings.setUserAgentString("Mozilla/5.0 (Linux; Android 10; SM-G970F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3396.81 Mobile Safari/537.36");
        webSettings.setAllowFileAccess(true);
        webSettings.setAllowContentAccess(true);
        webSettings.supportZoom();
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            webSettings.setMediaPlaybackRequiresUserGesture(false);
        }
        webSettings.setGeolocationEnabled(true);
        webSettings.setRenderPriority(WebSettings.RenderPriority.HIGH);
        webSettings.setDatabaseEnabled(true);
        webSettings.setAppCacheEnabled(true);
        webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
//        webSettings.setSupportMultipleWindows(true);
        webSettings.setSaveFormData(true);
        webSettings.setSavePassword(true);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED, WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);


        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            // chromium, enable hardware acceleration
            webview.setLayerType(View.LAYER_TYPE_HARDWARE, null);
        } else {
            // older android version, disable hardware acceleration
            webview.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }

        /*acces file url*/
        if (Build.VERSION.SDK_INT >= 16) {
            webSettings.setAllowFileAccessFromFileURLs(true);
            webSettings.setAllowUniversalAccessFromFileURLs(true);
        }

        if (Build.VERSION.SDK_INT < 18) {
            webSettings.setRenderPriority(WebSettings.RenderPriority.HIGH);
        }

        if (Build.VERSION.SDK_INT < 19) {
            webSettings.setDatabasePath(databaseDir);
        }

        if (Build.VERSION.SDK_INT >= 21) {
            CookieManager.getInstance().setAcceptThirdPartyCookies(webview, true);
        }

    }

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