此活動嘗試接收從另一活動傳遞的文本,並將其合併以形成帶查詢字符串的網址。然後將url傳遞給asynctask函數以從服務器獲取數據並將其顯示到textview。我無法理解哪裏出錯了。textView僅顯示標籤,而不是從服務器獲取的數據
public class GetDetails extends Activity {
public static final String address = null;
String result = null;
InputStream is = null;
StringBuilder sb = null;
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.simpleview);
Bundle extras=getIntent().getExtras();
String i= extras.getString("id");
new DetailThread().execute(i);
}
class DetailThread extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(String... text) {
String ix=text.toString();
String address = "http://server/foreach.php?id="+ix;
parseJson(address);
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
};
}
void parseJson(String url) {
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
.show();
}
// response to inputstream
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"));
sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
.show();
}
// to string
try {
JSONArray jArray = new JSONArray(result);
JSONObject json_data = null;
String name=null;
String country=null;
TextView tv = (TextView) findViewById(R.id.textView1);
TextView tv2 = (TextView) findViewById(R.id.textView2);
for (int i = 0; i < jArray.length(); i++) {
json_data = jArray.getJSONObject(i);
name = "Name: "+json_data.getString("Name");
country ="Country: "+json_data.getString("Country");
tv.setText(name);
tv2.setText(country);
}
}
//json parsing exceptions handled here
}
}
}
當我運行這是我剛剛得到的是標籤爲「大文本」和「中文字」,而不是數據必須被顯示在文本字段
內'parseJson'方法,你都呈現吐司消息,也改變TextViews但目前調用'parseJson'方法形式' doInBackground'表示來自非UI線程。讓它工作返回數據或json來自'doInBackground'的字符串並使用'onPostExecute'在TextViews中顯示數據 – 2013-05-07 08:01:04