【发布时间】：2012-04-20 01:51:01
【问题描述】：
我正在开发一个应用程序，它使用barcode 在扫描barcode 后获取商品的产品信息。
我不希望用户单独安装ZXing barcode 应用程序，因此我将ZXing 代码嵌入到我的项目中。所以我能够获得barcode ID number。
我想通过 google search api 使用条形码号码获取 产品信息，例如 名称、制造商、价格等 进行购物。
这是我使用的代码
public class JSONExampleActivity extends Activity {
TextView httpStuff;
DefaultHttpClient client;
JSONObject json;
final static String URL = "https://www.googleapis.com/shopping/search";
String upc = "/v1/public/products?country=US&q=691464717759&restrictBy=gtin=691464717759";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
httpStuff = (TextView) findViewById(R.id.tvHttp);
client = new DefaultHttpClient();
new Read().execute("items");
}
public JSONObject products(String upc) throws ClientProtocolException, IOException, JSONException {
StringBuilder url = new StringBuilder(URL);
url.append(upc);
HttpGet get = new HttpGet(url.toString());
HttpResponse r = client.execute(get);
int status = r.getStatusLine().getStatusCode();
if (status == 200) {
HttpEntity e = r.getEntity();
String data = EntityUtils.toString(e);
JSONObject timeline = new JSONObject(data);
return timeline;
}
else {
Toast.makeText(JSONExampleActivity.this, "error", Toast.LENGTH_SHORT);
return null;
}
}
public class Read extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
try {
json = products(upc);
return json.getString(params[0]);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result){
httpStuff.setText(result);
}
}
但我在 httpStuff 中没有收到任何文本。
这是日志猫：
D/SntpClient(61): request time failed: java.net.SocketException: Address family not supported by protocol
W/System.err(793): org.apache.http.conn.ConnectTimeoutException: Connect to /209.85.175.95:443 timed out
W/System.err(793): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121)
W/System.err(793): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
W/System.err(793): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
W/System.err(793): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
W/System.err(793): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
W/System.err(793): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
W/System.err(793): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
W/System.err(793): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
W/System.err(793): at com.android.example.jsonexample.JSONExampleActivity.products(JSONExampleActivity.java:53)
W/System.err(793): at com.android.example.jsonexample.JSONExampleActivity$Read.doInBackground(JSONExampleActivity.java:77)
W/System.err(793): at com.android.example.jsonexample.JSONExampleActivity$Read.doInBackground(JSONExampleActivity.java:1)
W/System.err(793): at android.os.AsyncTask$2.call(AsyncTask.java:185)
W/System.err(793): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
W/System.err(793): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
W/System.err(793): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
W/System.err(793): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
W/System.err(793): at java.lang.Thread.run(Thread.java:1019)
D/SntpClient(61): request time failed: java.net.SocketException: Address family not supported by protocol
请帮我找出错误的原因。
【问题讨论】：
-
您对此有什么解决方案吗？我必须在我的应用程序中为我们的一位客户实现相同的功能。你能把解决办法发给我吗？