android OS升级到4.4之后，有些WebView的链接我们点击无效了，下面可以解决其中的某一种情况:

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，如果不是Server那边的问题，那么想在界面上显示自定义的错误(如遇到连接到WIFI CMCC而没有移动的密码,手机显示着连接上了WIFI)

这时我们需要去截获WebView的error,可以通过重载setWebViewClient的方法去截获，可以参考google文档:点击这里打开

在代码:

<span style="white-space:pre">			</span>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<ResolveInfo> 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();
				}
			}
		});

    // 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;