[英]Sending a json Http request with parameters from Android
閱讀一些教程后,我可以使用php從MySql數據庫中獲取訂單列表,並顯示在我的Android應用中。 我需要通過userId過濾此列表(useid保存在首選項中)。 我必須發送帶有參數“ userId”的http請求,但我不知道如何。 我現在擁有的代碼:
public class JSONfunctions {
public static JSONObject getJSONfromURL(String url){
InputStream is = null;
String result = "";
JSONObject jArray = null;
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),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("log_tag", "Error converting result "+e.toString());
}
try{
jArray = new JSONObject(result);
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
return jArray;
}
}
對於訂單列表:
public class Masuratori extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listplaceholder);
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
JSONObject json = JSONfunctions.getJSONfromURL("http://MySite/masuratori.php");
try{
JSONArray earthquakes = json.getJSONArray("earthquakes");
for(int i=0;i<earthquakes.length();i++){
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = earthquakes.getJSONObject(i);
map.put("id", String.valueOf(i));
map.put("name", e.getString("clie"));
map.put("magnitude", e.getString("userid"));
map.put("adresa", e.getString("adr"));
map.put("detalii", e.getString("det"));
mylist.add(map);
}
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data "+e.toString());
}
ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.activity_masuratori,
new String[] { "name", "adresa","detalii","magnitude"},
new int[] { R.id.item_title, R.id.item_subtitle, R.id.item_subtitle2, R.id.item_subtitle3 });
setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
Toast.makeText(Masuratori.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_SHORT).show();
}
});
}
}
我從首選項中收到用戶ID值:
public class Calculator extends Activity {
TextView prefEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);
prefEditText= (TextView)findViewById(R.id.textUser);
loadPref();
prefEditText= (TextView)findViewById(R.id.prefEditText);
loadPref();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.calculator, menu);
return true;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
//super.onActivityResult(requestCode, resultCode, data);
loadPref();
}
private void loadPref(){
SharedPreferences mySharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
String my_edittext_preference = mySharedPreferences.getString("edittext_preference", "");
prefEditText.setText(my_edittext_preference);
}
}
在execute()
HttpPost
,可以使用以下代碼添加參數:
// Add userId parameter
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("userId", "12345"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
由於您僅發送一個參數,為什么不在查詢字符串中發送它。
String userId = getUserId();
JSONObject json = JSONfunctions.getJSONfromURL("http://MySite/masuratori.php?userId=" + userId);
然后您在php中檢索它
$userId = $_GET['userId']
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