[問題] null值無法進入if 判斷式
目前在寫一個程式
是先抓到mysql的再轉換成json字串
但我想寫個判斷式若 值result是null的話 會出現警語
程式是這樣:
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(link);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("1", "Error in http connection " + e.toString());
}
// convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReade
is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("2", "Error converting result " + e.toString());
}
// parse json data
// Log.e("result", result);
if (result==null) {
Toast.makeText(ScheduleActivity.this, R.string.noresult,
Toast.LENGTH_LONG).show();
}
else {
///////////////////////
}
我重Log.e看可以看到我所抓的result 的值是null
但是程式都會進入else裡面而不是在if那邊出現警語
我也試過
if (result.equals(null)) {
}
的寫法還是不行@@
還請高手指點!!!
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