解决Android webview设置cookie和cookie丢失的问题

    mWebView = view.findViewById(R.id.mall_view);
    settings = mWebView.getSettings();
    settings.setJavaScriptEnabled(true);
    settings.setLoadsImagesAutomatically(true);
    settings.setDomStorageEnabled(true);
    //不缓存
    settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
    mWebView.setWebViewClient(new MyWebViewClient());

  class MyWebViewClient extends WebViewClient{
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
      if (url != "") {
        //重点写入cookie
        HashMap<String, String> map = new HashMap<>();
        map.put("Referer", view.getUrl());
        view.loadUrl(url, map);
      }
      return true;
    }

    @Override
    public void onPageFinished(WebView view, String url) {
      //获取登陆后的cookie,看是否写入
      CookieManager cookieManager = CookieManager.getInstance();
      String CookieStr = cookieManager.getCookie(url);
      super.onPageFinished(view, url);
    }
  }

  /**
   * 获取接口中的cookie
   * @param loginUrl
   */
  private void syncCookie(final String loginUrl) {

    new Thread(new Runnable() {


      @Override
      public void run() {
        try {
          StringBuilder builder = new StringBuilder();
          URL url= null;
          byte[] data = builder.toString().getBytes("UTF-8");
          url = new URL(loginUrl);
          HttpURLConnection connection =
              (HttpURLConnection) url.openConnection();

          connection.setDoOutput(true);
          connection.setRequestProperty("Content-Type",
              "application/x-www-form-urlencoded");
          connection.setRequestProperty("Content-Length",
              Integer.toString(data.length));
          connection.setRequestMethod("GET");
          connection.setInstanceFollowRedirects(false);
          OutputStream os = connection.getOutputStream();
          os.write(data);
          os.close();
          int aRstCode = connection.getResponseCode();
          if (aRstCode == HttpURLConnection.HTTP_OK) {
            cookie = connection.getHeaderField("Set-Cookie");
          }

        } catch (MalformedURLException e) {
          e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
          e.printStackTrace();
        } catch (ProtocolException e) {
          e.printStackTrace();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }).start();
  }
    //设置cookie
    if(cookie != null && cookie.length() > 0){
      android.webkit.CookieManager cookieManager =
          android.webkit.CookieManager.getInstance();
      cookieManager.setAcceptCookie(true);
      cookieManager.setCookie(SysParam.shoppingMall, cookie);
      CookieSyncManager.getInstance().sync();
    }

 webView.setWebViewClient(new WebViewClient() {
      @Override
      public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
        Log.e("app_name",error.toString());
        handler.proceed();
      }
    });

SharedPreferences sharedPreferences = getSharedPreferences("login",MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
String cookieval = conn.getHeaderField("Set-Cookie");
editor.putString("all_cookie",cookieval);

/**
*@param cookie 上面获取到的存储在本地的cookie字符串
*@param url 要加载的页面url
*/
 private void setCookie(String cookie,String url) {
    String StringCookie = cookie;
    CookieManager cookieManager = CookieManager.getInstance();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      cookieManager.removeSessionCookies(null);
      cookieManager.flush();
    } else {
      cookieManager.removeSessionCookie();
      CookieSyncManager.getInstance().sync();
    }
    cookieManager.setAcceptCookie(true);
    cookieManager.setCookie(url, StringCookie);
  }

 SharedPreferences sharedPreferences = getSharedPreferences("login",MODE_PRIVATE);
 String cookie = sharedPreferences.getString("session","");
 String all_cookie = sharedPreferences.getString("all_cookie","");
 Log.e("weibiao",all_cookie);
 webView = findViewById(R.id.other_account_service_webview);
 webView.setWebViewClient(new WebViewClient() {
   @Override
   public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
     Log.e("weibiao",error.toString());
     handler.proceed();
   }
 });
 initWebViewSettings();//webview的一些设置
 setCookie(all_cookie,url);//在loadurl之前调用此方法
 webView.loadUrl(url);