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因此我使用了遍佈網絡的代碼示例,並讓我的應用程序準確地調用服務器上的.php文件,檢索JSON數據,然後解析數據,並打印出來。如何通過遠程數據庫檢索數據後操作數據
問題是,它只是爲了我接下來的教程而打印到屏幕上,但現在我需要在其他地方使用該數據,並且需要幫助來確定該過程。
最終目標是返回我的數據庫查詢與地圖座標,然後在谷歌地圖上繪製它們。我有另一個應用程序,我可以在地圖上手動繪製點,所以我會將這個應用程序與那個應用程序集成在一起,一旦我能夠了解如何正確處理返回的數據。
public class Remote extends Activity {
/** Called when the activity is first created. */
TextView txt;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Create a crude view - this should really be set via the layout resources
// but since its an example saves declaring them in the XML.
LinearLayout rootLayout = new LinearLayout(getApplicationContext());
txt = new TextView(getApplicationContext());
rootLayout.addView(txt);
setContentView(rootLayout);
// Set the text and call the connect function.
txt.setText("Connecting...");
//call the method to run the data retreival
txt.setText(getServerData(KEY_121));
}
public static final String KEY_121 = "http://example.com/mydbcall.php";
private String getServerData(String returnString) {
InputStream is = null;
String result = "";
//the year data to send
//ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
//nameValuePairs.add(new BasicNameValuePair("year","1970"));
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(KEY_121);
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());
}
//parse json data
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag","longitude: "+json_data.getDouble("longitude")+
", latitude: "+json_data.getDouble("latitude")
);
//Get an output to the screen
returnString += "\n\t" + jArray.getJSONObject(i);
}
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
return returnString;
}
}
因此,代碼:
returnString += "\n\t" + jArray.getJSONObject(i);
就是當前正在打印到屏幕上。
我要弄清楚是如何獲取數據到的東西我可以在其他點在程序參考,並訪問各個元素 即:
double longitude = jArray.getJSONObject(3).longitude;
或大意的東西..
我想這個類的getServerData將不得不返回一個數組類型或什麼?
任何幫助表示讚賞,謝謝。
我照你所描述的做,並返回結果,這是我的類位置的數組。快速的問題,我怎樣才能訪問數據,一旦返回像result.get(位置);? – bMon 2011-01-11 17:37:10