问题描述
我想收集一些JSON数据，通过举杯为试把这些字符串中，并显示在我的应用程序。我是pretty确保服务器允许我和回应我的请求，因为previously用相同的URL（URI）。测试GET方法上的提琴手
I'm trying to collect some json data, put those in a string and show them in my app through a toast as for test. I'm pretty sure that the server allows me and responds to my request because previously testing the GET method on Fiddler with the same URL(URI).
下面是活动/类code：
Here's the activity/class code:
BufferedReader in = null;
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
try {
request.setURI(new URI("http://scards.cloudapp.net/api/AddressBooks/3"));
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HttpResponse response = null;
try {
response = client.execute(request);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
in = new BufferedReader
(new InputStreamReader(response.getEntity().getContent()));
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
try {
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String page = sb.toString();
Toast.makeText(this, page, Toast.LENGTH_LONG).show();
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
而在LogCat中它表明我，我有android.os.NetworkOnMainThreadException。
开放的建议和更正。
And in LogCat it shows me that I have android.os.NetworkOnMainThreadException.Open to suggestions and corrections.
项目属性：SDK：API16 - Android的4.1.2，minBuilSDK：API：7的Android 2.1（埃克莱尔） - 是Eclipse SDK 4.2
Project properties : SDK: API16 - Android 4.1.2, minBuilSDK : API:7 Android 2.1(Eclair) - Eclipse SDK 4.2
推荐答案
下面是的AsyncTask 下面的一个例子。此外
Here is an example of AsyncTask below. Also here is a great tutorial
class MyAsyncTask extends AsyncTask<String, String, Void> {
private ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
InputStream inputStream = null;
String result = "";
protected void onPreExecute() {
progressDialog.setMessage("Your progress dialog message...");
progressDialog.show();
progressDialog.setOnCancelListener(new OnCancelListener() {
public void onCancel(DialogInterface arg0) {
MyAsyncTask.this.cancel(true);
}
});
}
@Override
protected Void doInBackground(String... params) {
String url_select = "http://yoururlhere.com";
ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();
try {
// Set up HTTP post
// HttpClient is more then less deprecated. Need to change to URLConnection
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url_select);
httpPost.setEntity(new UrlEncodedFormEntity(param));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
// Read content & Log
inputStream = httpEntity.getContent();
} catch (UnsupportedEncodingException e1) {
Log.e("UnsupportedEncodingException", e1.toString());
e1.printStackTrace();
} catch (ClientProtocolException e2) {
Log.e("ClientProtocolException", e2.toString());
e2.printStackTrace();
} catch (IllegalStateException e3) {
Log.e("IllegalStateException", e3.toString());
e3.printStackTrace();
} catch (IOException e4) {
Log.e("IOException", e4.toString());
e4.printStackTrace();
}
// Convert response to string using String Builder
try {
BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"), 8);
StringBuilder sBuilder = new StringBuilder();
String line = null;
while ((line = bReader.readLine()) != null) {
sBuilder.append(line + "\n");
}
inputStream.close();
result = sBuilder.toString();
} catch (Exception e) {
Log.e("StringBuilding & BufferedReader", "Error converting result " + e.toString());
}
} // protected Void doInBackground(String... params)
protected void onPostExecute(Void v) {
//parse JSON data
try{
JSONArray jArray = new JSONArray(result);
for(int i=0; i < jArray.length(); i++) {
JSONObject jObject = jArray.getJSONObject(i);
String name = jObject.getString("name");
String tab1_text = jObject.getString("tab1_text");
int active = jObject.getInt("active");
} // End for Loop
this.progressDialog.dismiss();
} catch (JSONException e) {
Log.e("JSONException", "Error: " + e.toString());
} // catch (JSONException e)
} // protected void onPostExecute(Void v)
} //class MyAsyncTask extends AsyncTask<String, String, Void>
我把我的的AsyncTask 这一行：
new MyAsyncTask().execute();
下面是一个YouTube的教程（来自波士顿新）为的AsyncTask ，我发现有帮助的。
结果
结果
这篇关于而试图在Android上HTTPGET的URL运行时错误 - Android电子的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！