我正在使用loopj的很棒的异步http库,但我遇到了一个小障碍。
如果用户没有互联网连接或失去连接,该应用程序将不会返回任何内容。这部分是预期的,但它也不会触发 onFailure 方法。
此外,我在有互联网连接时使用的代码确实有效,因此在服务器端没有问题。
下面是一些精简到最低限度的代码。它也不起作用(我也测试过这个)
String url = getString(R.string.baseurl) + "/appconnect.php";
client.getHttpClient().getParams().setParameter(ClientPNames.ALLOW_CIRCULAR_REDIRECTS, true);
client.get(url, null, new JsonHttpResponseHandler()
{
@Override
public void onSuccess(JSONArray response)
{
Toast.makeText(getApplicationContext(), "Success", Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(Throwable e, JSONArray errorResponse)
{
Toast.makeText(getApplicationContext(), "Failure", Toast.LENGTH_SHORT).show();
}
});
谢谢艾希礼
你可以试试这个:
在 AsyncHttpRequest->makeRequestWithRetries()
中,向SocketException
添加一个捕获,如下所示:
while (retry) {
try {
makeRequest();
return;
} catch (UnknownHostException e) {
if(responseHandler != null) {
responseHandler.sendFailureMessage(e, "can't resolve host");
}
return;
} catch (SocketException e){
// Added to detect no connection.
if(responseHandler != null) {
responseHandler.sendFailureMessage(e, "can't resolve host");
}
return;
} catch (IOException e) {
cause = e;
retry = retryHandler.retryRequest(cause, ++executionCount, context);
} catch (NullPointerException e) {
// there's a bug in HttpClient 4.0.x that on some occasions causes
// DefaultRequestExecutor to throw an NPE, see
// http://code.google.com/p/android/issues/detail?id=5255
cause = new IOException("NPE in HttpClient" + e.getMessage());
retry = retryHandler.retryRequest(cause, ++executionCount, context);
}
}
是的,不幸的是,loopj Android库设计得不是很好。如果实现其他onFailure
回调,则应触发其中一个回调:
@Override
public void onFailure(Throwable e) {
Log.e(TAG, "OnFailure!", e);
}
@Override
public void onFailure(Throwable e, String response) {
Log.e(TAG, "OnFailure!", e);
}
@Override
public void onFailure(Throwable e, JSONArray errorResponse) {
Log.e(TAG, "OnFailure!", e);
}
试试这个:
@Override
protected Object parseResponse(byte[] responseBody) throws JSONException {
return super.parseResponse(responseBody);
}