android webview 解决回退重定向的问题

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public class MainActivity extends AppCompatActivity {    private WebView webview;    private MyWebViewClient webViewClient;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        webview = (WebView) findViewById(R.id.webview);        webViewClient = new MyWebViewClient();        webview.getSettings().setJavaScriptEnabled(true);        webview.setWebViewClient(webViewClient);        webview.loadUrl("https://m.taobao.com/");    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        return pageGoBack(webview,webViewClient);    }    public boolean pageGoBack(WebView web, MyWebViewClient client) {        final String url = client.popLastPageUrl();        if (url != null) {            web.loadUrl(url);            return true;        }        finish();        return false;    }    class MyWebViewClient extends WebViewClient{        /**         * 记录URL的栈         */        private final Stack<String> mUrls = new Stack<>();        /**         * 判断页面是否加载完成         */        private boolean mIsLoading;        private String mUrlBeforeRedirect;        @Override        public void onPageStarted(WebView view, String url, Bitmap favicon) {            super.onPageStarted(view, url, favicon);            if (mIsLoading && mUrls.size() > 0) {                mUrlBeforeRedirect = mUrls.pop();            }            recordUrl(url);            this.mIsLoading = true;        }        /**         * 记录非重定向链接, 避免刷新页面造成的重复入栈         *         * @param url 链接         */        private void recordUrl(String url) {            //这里还可以根据自身业务来屏蔽一些链接被放入URL栈            if (!TextUtils.isEmpty(url) && !url.equalsIgnoreCase(getLastPageUrl())) {                mUrls.push(url);            } else if (!TextUtils.isEmpty(mUrlBeforeRedirect)) {                mUrls.push(mUrlBeforeRedirect);                mUrlBeforeRedirect = null;            }        }        /**         * 获取上一页的链接         **/        private synchronized String getLastPageUrl() {            return mUrls.size() > 0 ? mUrls.peek() : null;        }        /**         * 推出上一页链接         */        public String popLastPageUrl() {            if (mUrls.size() >= 2) {                mUrls.pop(); //当前url                return mUrls.pop();            }            return null;        }        @Override        public void onPageFinished(WebView view, String url) {            super.onPageFinished(view, url);            if (this.mIsLoading) {                this.mIsLoading = false;            }        }        @Override        public boolean shouldOverrideUrlLoading(WebView view, String url) {            return false;        }    }}
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