有没有办法让用户在重新启动后保持登录状态而不在本地保存用户名和密码？。我只想在应用程序关闭时暂停会话，然后在打开时恢复会话。

两个都试过：

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

还尝试了 CookieManager 并设法做我想做的事，但由于某种原因，它停止作业并在应用程序退出时不断注销用户（我还是个新手，我不知道发生了什么，无法修复它）。所以我试图找到一种不同的方法来做到这一点。

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热心网友回复：

这是我使用的作业代码。试试这些。

 /*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);
        }

    }