Currency-Converter-Main-Activity

package com.Najiba.Wajiha.Mahboob.currencyconverter;

import android.content.Context; import android.os.AsyncTask; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.inputmethod.InputMethodManager; import android.widget.AdapterView; import android.widget.EditText; import android.widget.Spinner; import android.widget.TextView; import android.widget.Toast;

import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.BasicHttpParams; import org.json.JSONException; import org.json.JSONObject;

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.text.DecimalFormat; import java.text.NumberFormat; import java.util.Arrays;

public class MainActivity extends ActionBarActivity {

EditText convertFromEditText;
TextView resultTextView;
TextView updatedTimeTextView;
Spinner convertFromSpinner;
Spinner convertToSpinner;
String currencyFrom = "";
String currencyTo = "";
String updateTime = "";
double currency = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    convertFromEditText = (EditText) findViewById(R.id.convert_from_edit_text);
    resultTextView = (TextView) findViewById(R.id.result_text_view);
    updatedTimeTextView = (TextView) findViewById(R.id.updated_time_text_view);
    convertFromSpinner = (Spinner) findViewById(R.id.from_spinner);
    convertToSpinner = (Spinner) findViewById(R.id.to_spinner);

    CurrencyAdapter adapter = new CurrencyAdapter(this, CurrencyInfo.getCurrencyName());
    convertFromSpinner.setAdapter(adapter);
    convertToSpinner.setAdapter(adapter);
    dismissKeyPad(convertFromSpinner);
    dismissKeyPad(convertToSpinner);
    setFromListener(convertFromSpinner);
    setToListener(convertToSpinner);
    convertFromEditText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            if (!convertFromEditText.getText().toString().isEmpty()) {
                new SaveTheFeed().execute();
            } else {
                resultTextView.setText(getString(R.string.to_text_view));
            }
        }
    });
}


public void dismissKeyPad(Spinner spinner) {
    spinner.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            InputMethodManager imm = (InputMethodManager)
                    getApplicationContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(convertFromEditText.getWindowToken(), 0);
            return false;
        }
    });
}

public void setFromListener(Spinner spinner) {
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            currencyFrom = CurrencyInfo.getCurrencyName()[position];
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });
}

public void setToListener(Spinner spinner) {
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            currencyTo = CurrencyInfo.getCurrencyName()[position];
            new SaveTheFeed().execute();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });
}

public void onClickExchange(View view) {
    int fromPos = convertFromSpinner.getSelectedItemPosition();
    int toPos = convertToSpinner.getSelectedItemPosition();
    convertFromSpinner.setSelection(toPos);
    convertToSpinner.setSelection(fromPos);
}

class SaveTheFeed extends AsyncTask<Void, Void, Void> {
    String jsonString;
    Double result;

    @Override
    protected Void doInBackground(Void... params) {

        if (!Arrays.asList(CurrencyInfo.getCurrencyName()).contains(currencyFrom)
                || !Arrays.asList(CurrencyInfo.getCurrencyName()).contains(currencyTo)) {
            Toast.makeText(MainActivity.this, "Error happens :(", Toast.LENGTH_SHORT).show();
        } else {
            DefaultHttpClient httpClient = new DefaultHttpClient(new BasicHttpParams());
            String url = "https://query.yahooapis.com/v1/public/yql" +
                    "?q=select%20*%20from%20yahoo.finance.xchange%20where" +
                    "%20pair%20in%20(%22" + currencyFrom + currencyTo + "%22)&format=json" +
                    "&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Fa" +
                    "lltableswithkeys&callback=";
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader("Content-type", "application/json");
            InputStream inputStream = null;
            try {
                HttpResponse response = httpClient.execute(httpPost);
                HttpEntity entity = response.getEntity();
                inputStream = entity.getContent();
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(inputStream, "UTF-8"), 8);
                StringBuilder sb = new StringBuilder();
                String line = null;
                while ((line = reader.readLine()) != null) {
                    sb.append(line);
                }
                jsonString = sb.toString();
                JSONObject jObject = new JSONObject(jsonString).
                        getJSONObject("query").getJSONObject("results").
                        getJSONObject("rate");
                updateTime = jObject.get("Date").toString() + " " +
                        jObject.get("Time").toString();
                currency = Double.parseDouble(jObject.get("Rate").toString());
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            }
            return null;
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
            if (convertFromEditText.getText().toString().isEmpty()) {
                return;
            } else {
                double fromDecimal =
                    Double.parseDouble(convertFromEditText.getText().toString());
                result = fromDecimal * currency;
                NumberFormat format = new DecimalFormat("#0.000");
                String resultString = format.format(result);
                String display = fromDecimal + " " + currencyFrom + " = " + resultString
                        + " " + currencyTo;
                resultTextView.setText(display);
                updatedTimeTextView.setText(getString(R.string.update_time) + updateTime);
            }
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}