对于每个特定的经度和纬度，我在互联网上都有一些数据。如果用户输入特定的纬度和经度，数据将从网络下载，然后用于进一步计算。我想保存该数据，以便下次用户输入相同的纬度和经度时，它会绕过网络连接并继续使用现有数据。
我的输入类：
public class OpTilt extends Activity implements OnClickListener {
EditText latitude, longitude;
Button go;
String data1, data2, link, link1;
double dat1, dat2;
TextView gps;
SharedPreferences dataurl;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.optilt);
initialize();
go.setOnClickListener(this);
}
private void initialize() {
// TODO Auto-generated method stub
go = (Button) findViewById(R.id.loaddata);
latitude = (EditText) findViewById(R.id.lat);
longitude = (EditText) findViewById(R.id.lon);
dataurl = getSharedPreferences("url", 0);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
data1 = longitude.getText().toString();
data2 = latitude.getText().toString();
dat1 = Double.parseDouble(data1);
dat2 = Double.parseDouble(data2);
link = ("http://www.otilt.com/api.php?lat=" + dat2 + "&lon=" + dat1);
SharedPreferences.Editor editor = dataurl.edit();
editor.putString("key", link);
editor.commit();
Intent i = new Intent(OpTilt.this, DataRetrieve.class);
startActivity(i);
}
}
我的解析课：
public class DataRetrieve extends Activity {
HttpClient client;
String URL, re, element;
JSONObject json, getjson;
int i, j, statusCode;
HttpGet httpget;
HttpResponse response;
HttpEntity entity;
InputStream is;
BufferedReader reader;
StringBuilder sb, sb1;
WakeLock w;
SharedPreferences getinput, passjson;
ProgressDialog pd;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
w = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "tag");
super.onCreate(savedInstanceState);
w.acquire();
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.dataretrieve);
// Bundle gotBasket = getIntent().getExtras();
// URL = gotBasket.getString("key");
getinput = getSharedPreferences("url", 0);
URL = getinput.getString("key", null);
Read r = new Read();
r.execute();
}
public class Read extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
pd = new ProgressDialog(DataRetrieve.this);
pd.setTitle("Processing...");
pd.setMessage("Please wait.");
pd.setCancelable(false);
pd.setIndeterminate(true);
pd.show();
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
re = null;
is = null;
json = null;
try {
client = new DefaultHttpClient();
httpget = new HttpGet(URL);
response = client.execute(httpget);
entity = response.getEntity();
is = entity.getContent();
statusCode = response.getStatusLine().getStatusCode();
} catch (Exception e) {
statusCode = -1;
Log.e("log_tag", "Erro http " + e.toString());
}
if (statusCode == 200) {
try {
reader = new BufferedReader(new InputStreamReader(is,
"UTF-8"), 8);
sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
re = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Erro conversão " + e.toString());
}
}
return re;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
pd.dismiss();
try {
json = new JSONObject(result);
getjson = json.getJSONObject("Solar");
String H[] = new String[getjson.length()];
for (i = 0, j = 1; i < getjson.length(); i++, j++) {
H[i] = getjson.getString("" + j);
}
Bundle bundle = new Bundle();
bundle.putStringArray("key1", H);
Intent f = new Intent(DataRetrieve.this, Calculator.class);
f.putExtras(bundle);
startActivity(f);
}
catch (JSONException e) {
Log.e("log_tag", "Erro dados " + e.toString());
}
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
w.release();
finish();
}
}
那么，我怎样才能实现我的目标呢？