Question

我已经实现了一个执行某些网络请求的try块但是每当它抛出一个例外有一个超时时，android应用程序会显示一条消息Saying

抱歉：该应用已停止意外，请重试。

向用户呈现的唯一选项是强制关闭按钮。我想捕获此异常并简单显示我自己的错误消息，让用户再次尝试连接，而不是用户必须关闭应用程序。

以下是代码：

我想要做的就是在捕获到异常后返回null，并且调用它的类将执行它自己的错误处理，如下所示：

if(postRequest == null){ display error message}

private HttpResponseObject PostRequest() {

        //int response = 0;

        String responseBody = "";
        HttpResponseObject response = new HttpResponseObject();

        try {

            Log.d(TAG, "IN POST_REQUEST_METHOD");
            Log.d(TAG, "URL : " + url);

            httpclient = new DefaultHttpClient();

            httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 1);
            //httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 10000);
            httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 5);
            Log.d(TAG, "httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 5000);");
            post = new HttpPost(url);
//          ClientConnectionRequest connRequest = new ManagedClientConnection();
//          post.setConnectionRequest((ClientConnectionRequest) connRequest.getConnection(3000, TimeUnit.MILLISECONDS));

            ByteArrayEntity entity = new ByteArrayEntity(data.getBytes());
            entity.setChunked(true);

            post.setEntity(new StringEntity(data));

            HttpResponse httpResponse = httpclient.execute(post);

            HttpEntity resEntity = httpResponse.getEntity();


            if (resEntity != null) {
                // indicate that the content of this entity is no longer
                // required
                response.setResponseBody(EntityUtils.toString(resEntity));

                Header[] header = httpResponse.getAllHeaders();

                Log.d(TAG, "httpResponse.getAllHeaders() = " + header[0].getName());
                response.setResponseHeader(httpResponse.getAllHeaders().toString());
                resEntity.consumeContent();
            }

            // release all recources from the httpClient object
            httpclient.getConnectionManager().shutdown();

            response.setResponseCode(httpResponse.getStatusLine().getStatusCode() ) ;

            Log.d(TAG, "responseBody = " + response.getResponseBody());
            Log.d(TAG, "response code = " + response.getResponseCode());
            Log.d(TAG, "response header = " + response.getResponseHeader());

            return response;

        } catch (SocketTimeoutException e) {
            e.printStackTrace();
            Log.d(TAG, "SocketTimeoutException e  = " + e.toString());
            return null;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Log.d(TAG, "IOException e  = " + e.toString());
            return null;
        }

    }

Answer 1

由于未捕获的异常，将显示“强制关闭”对话框。由于您没有自己抛出已检查的异常，这是由于运行时异常，很可能是空指针异常。这意味着您的代码中存在导致此错误而不是网络错误的错误。

为了找到问题，您需要知道抛出的异常的类型及其消息。您可以在LogCat中看到这些 - 如果您使用的是Eclipse，则可以在调试透视图中找到它。

Android从异常中显示我自己的错误消息

1 个答案: