android OS升级到4.4之后，有些WebView的链接我们点击无效了，以下能够解决当中的某一种情况:

webviewClient的shouldOverrideUrlLoading方法必须返回false,返回true会导致这个问题

有时候PM会有一种需求，假设不是Server那边的问题，那么想在界面上显示自己定义的错误(如遇到连接到WIFI CMCC而没有移动的password,手机显示着连接上了WIFI)

这时我们须要去截获WebView的error,能够通过重载setWebViewClient的方法去截获，能够參考google文档:

在代码:

			this.mWebView.setWebViewClient(new WebViewClient() {			public boolean shouldOverrideUrlLoading(WebView view, String url) {				if (url.startsWith(ReportActivity.this.getString(R.string.url_start_chars1)) 						|| url.startsWith(ReportActivity.this.getString(R.string.url_start_chars2))) {					view.loadUrl(url);				} else if(url.startsWith(ReportActivity.this.getString(R.string.url_start_chars3))){				    Uri uri=Uri.parse(url);			        Intent emailIntent=new Intent(Intent.ACTION_SENDTO, uri);			        List
     
       availableSoft = getPackageManager().queryIntentActivities(emailIntent, PackageManager.MATCH_DEFAULT_ONLY);			        if (availableSoft.size() > 0) {			        	try {					startActivity(emailIntent);					} catch (Exception e) {												}				}			    } 				return false;			}						@Override			public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {				handler.proceed();			}						@Override			public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {  //这里截获错误				isLoadingError = true;				Toast.makeText(ReportActivity.this, "errorCode="+errorCode, Toast.LENGTH_LONG).show();				super.onReceivedError(view, errorCode, description, failingUrl);			}								});				this.mWebView.setWebChromeClient(new WebChromeClient() {						@Override			public void onProgressChanged(WebView view, int newProgress) {				if (newProgress >= 80) {					updateState(true);					System.out.println("=========isSuccess onProgressChanged isLoadingError="+isLoadingError);					if(isLoadingError) {						mState = State.GetDataError;					}					updateStateView();				}			}		});
     

错误的类型有:

// These ints must match up to the hidden values in EventHandler.    /** Generic error */    public static final int ERROR_UNKNOWN = -1;    /** Server or proxy hostname lookup failed */    public static final int ERROR_HOST_LOOKUP = -2;    /** Unsupported authentication scheme (not basic or digest) */    public static final int ERROR_UNSUPPORTED_AUTH_SCHEME = -3;    /** User authentication failed on server */    public static final int ERROR_AUTHENTICATION = -4;    /** User authentication failed on proxy */    public static final int ERROR_PROXY_AUTHENTICATION = -5;    /** Failed to connect to the server */    public static final int ERROR_CONNECT = -6;    /** Failed to read or write to the server */    public static final int ERROR_IO = -7;    /** Connection timed out */    public static final int ERROR_TIMEOUT = -8;    /** Too many redirects */    public static final int ERROR_REDIRECT_LOOP = -9;    /** Unsupported URI scheme */    public static final int ERROR_UNSUPPORTED_SCHEME = -10;    /** Failed to perform SSL handshake */    public static final int ERROR_FAILED_SSL_HANDSHAKE = -11;    /** Malformed URL */    public static final int ERROR_BAD_URL = -12;    /** Generic file error */    public static final int ERROR_FILE = -13;    /** File not found */    public static final int ERROR_FILE_NOT_FOUND = -14;    /** Too many requests during this load */    public static final int ERROR_TOO_MANY_REQUESTS = -15;