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【Android】WebViewでキャッシュやクッキー削除をする

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キャッシュの削除方法

webView.clearCache(true);

ちなみにキャッシュを使わないで常に表示を行いたい時は

webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);

クッキーの削除

Lollipop以降と前で推奨されるメソッドが変わるので処理を分けます

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
   CookieManager.getInstance().removeAllCookies(null);
   CookieManager.getInstance().flush();
} else {
   CookieSyncManager cookieSyncMngr=CookieSyncManager.createInstance(getApplicationContext());
   cookieSyncMngr.startSync();
   CookieManager cookieManager=CookieManager.getInstance();
   cookieManager.removeAllCookie();
   cookieManager.removeSessionCookie();
   cookieSyncMngr.stopSync();
   cookieSyncMngr.sync();
}
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