Android的WebView自身是支持网页挑起第三方App的,但是如果为WebView设置了自定义的WebViewClient,这个功能就失效了,解决方案如下。
WebViewClient中有一个方法:shouldOverrideUrlLoading,这个方法的作用是让业务层可以根据url的值决定用什么方式来处理这个url。
/**
* Give the host application a chance to take over the control when a new
* url is about to be loaded in the current WebView. If WebViewClient is not
* provided, by default WebView will ask Activity Manager to choose the
* proper handler for the url. If WebViewClient is provided, return true
* means the host application handles the url, while return false means the
* current WebView handles the url.
* This method is not called for requests using the POST "method".
*
* @param view The WebView that is initiating the callback.
* @param url The url to be loaded.
* @return True if the host application wants to leave the current WebView
* and handle the url itself, otherwise return false.
*/
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return false;
}
如果没有为WebView设置WebViewClient,那么WebView就会让Activity Manager来决定如何处理这个url,如果设置了WebViewClient,就需要通过该方法的返回值通知WebView是否需要让它处理,如果需要自行处理,就可以在该方法中处理该url。
具体代码如下
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (shouldOverrideUrlLoadingByApp(view, url)) {
return true;
}
return super.shouldOverrideUrlLoading(view, url);
}
/**
* 根据url的scheme处理跳转第三方app的业务
*/
private boolean shouldOverrideUrlLoadingByApp(WebView view, String url) {
if (url.startsWith("http") || url.startsWith("https") || url.startsWith("ftp")) {
//不处理http, https, ftp的请求
return false;
}
Intent intent;
try {
intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
} catch (URISyntaxException e) {
XLLog.e(TAG, "URISyntaxException: " + e.getLocalizedMessage());
return false;
}
intent.setComponent(null);
try {
getContext().startActivity(intent);
} catch (ActivityNotFoundException e) {
XLLog.e(TAG, "ActivityNotFoundException: " + e.getLocalizedMessage());
return false;
}
return true;
}
如上面的解决方案,当设备上没有安装目标app时,startActivity()
方法会抛出ActivityNotFoundException
,shouldOverrideUrlLoading()
方法就会返回false,该url就会交给浏览器处理,浏览器肯定无法处理这种自定义scheme的协议,就会抛出NOT_SUPPORT_SCHEME
错误,导致网页出现无法加载的错误页面。解决方法是判断浏览器能处理哪些scheme,如果检测到该url是浏览器无法处理的,就不让浏览器处理了,那么自然就不会出现这个问题。
例如:
intent://dangdang://product//pid=23248697#Intent;scheme=dangdang://product//pid=23248697;package=com.dangdang.buy2;end
,该url通过Intent intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
解析后,intent中会包含应用报名,那么就可以先通过mActivity.getPackageManager().resolveActivity(intent, 0) == null
判断设备中是否有app能处理这个url,如果没有,就根据包名跳转应用市场进行下载。当然站在产品的角度,是不希望无偿帮应用市场导量的,所以也可以不跳转应用市场。一般来说,如果网页中的deeplink有这种需求,在检测到设备中无法处理该url时,还会触发目前app的下载链接,这种方案在网页中的实现目前没有去了解,只是知道这样会回调WebView的DownloadListener,客户端可以在回调中处理目标app的下载操作。
以上两个问题的解决方案
public class ADIntentUtils {
private static final String TAG = "IntentUtils";
/**
* 系统可以处理的url正则
*/
private static final Pattern ACCEPTED_URI_SCHEME = Pattern.compile("(?i)"
+ // switch on case insensitive matching
'('
+ // begin group for scheme
"(?:http|https|ftp|file)://" + "|(?:inline|data|about|javascript):" + "|(?:.*:.*@)"
+ ')' + "(.*)");
private Activity mActivity = null;
public ADIntentUtils(Activity activity) {
this.mActivity = activity;
}
public boolean shouldOverrideUrlLoadingByApp(WebView view, String url) {
return shouldOverrideUrlLoadingByAppInternal(view, url, true);
}
private boolean shouldOverrideUrlLoadingByAppInternal(WebView view, String url, boolean interceptExternalProtocol) {
if (isAcceptedScheme(url)) return false;
Intent intent;
try {
intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
} catch (URISyntaxException e) {
Log.e(TAG, "URISyntaxException: " + e.getLocalizedMessage());
return interceptExternalProtocol;
}
intent.setComponent(null);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
intent.setSelector(null);
}
//intent://dangdang://product//pid=23248697#Intent;scheme=dangdang://product//pid=23248697;package=com.dangdang.buy2;end
//该Intent无法被设备上的应用程序处理
if (mActivity.getPackageManager().resolveActivity(intent, 0) == null) {
return tryHandleByMarket(intent) || interceptExternalProtocol;
}
try {
mActivity.startActivity(intent);
} catch (ActivityNotFoundException e) {
Log.e(TAG, "ActivityNotFoundException: " + e.getLocalizedMessage());
return interceptExternalProtocol;
}
return true;
}
private boolean tryHandleByMarket(Intent intent) {
String packagename = intent.getPackage();
if (packagename != null) {
intent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id="
+ packagename));
try{
mActivity.startActivity(intent);
} catch (ActivityNotFoundException e) {
Log.e(TAG, "tryHandleByMarket ActivityNotFoundException: " + e.getLocalizedMessage());
return false;
}
return true;
} else {
return false;
}
}
/**
* 该url是否属于浏览器能处理的内部协议
*/
private boolean isAcceptedScheme(String url) {
//正则中忽略了大小写,保险起见,还是转成小写
String lowerCaseUrl = url.toLowerCase();
Matcher acceptedUrlSchemeMatcher = ACCEPTED_URI_SCHEME.matcher(lowerCaseUrl);
if (acceptedUrlSchemeMatcher.matches()) {
return true;
}
return false;
}
}