1-usul: Maxsus sinflarni yaratish

1-usul: Maxsus sinflarni yaratish

Biz yaratadigan birinchi sinf RequestPackage klassi deb nomlanadi. Ushbu sinf HTTP so'rovlarini bajarishda uchta muhim qiymatni qabul qiladi. Birinchidan, u URL manzilini oladi.

public class RequestPackage {

private String url;

private String method = "GET"; //method is set to GET by default

private Map params = new HashMap<>();//This will hold any values

//that the server may require

// e.g. product_id

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

public String getMethod() {

return method;

}

public void setMethod(String method) {

this.method = method;

}

public Map getParams() {

return params;

}

public void setParams(Map params) {

this.params = params;

}

public void setParam(String key, String value) {

params.put(key, value); //adds a single value to the params member variable

}

//The method below is only called if the request method has been set to GET

//GET requests sends data in the url and it has to be encoded correctly in order

//for the server to understand the request. This method encodes the data in the

//params variable so that the server can understand the request

public String getEncodedParams() {

StringBuilder sb = new StringBuilder();

for (String key : params.keySet()) {

String value = null;

try {

value = URLEncoder.encode(params.get(key), "UTF-8");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

if (sb.length() > 0) {

sb.append("&");

}

sb.append(key + "=" + value);

}

return sb.toString();

}

}

HttpManager

Keyinchalik, biz HttpManager sinfini yaratamiz.

public class HttpManager {

public static String getData(RequestPackage requestPackage) {

BufferedReader reader = null;

String uri = requestPackage.getUrl();

if (requestPackage.getMethod().equals("GET")) {

uri += "?" + requestPackage.getEncodedParams();

//As mentioned before, this only executes if the request method has been

//set to GET

}

try {

URL url = new URL(uri);

HttpURLConnection con = (HttpURLConnection) url.openConnection();

con.setRequestMethod(requestPackage.getMethod());

if (requestPackage.getMethod().equals("POST")) {

con.setDoOutput(true);

OutputStreamWriter writer =

new OutputStreamWriter(con.getOutputStream());

writer.write(requestPackage.getEncodedParams());

writer.flush();

}

StringBuilder sb = new StringBuilder();

reader = new BufferedReader(new InputStreamReader(con.getInputStream()));

String line;

while ((line = reader.readLine()) != null) {

sb.append(line + "\n");

}

return sb.toString();

} catch (Exception e) {

e.printStackTrace();

return null;

} finally {

if (reader != null) {

try {

reader.close();

} catch (IOException e) {

e.printStackTrace();

return null;

}

}

}

}

}

Barchasini birlashtirish

public class MainActivity extends AppCompatActivity {

private TextView mPriceTextView;

private String BASE_URL = "https://apiv2.bitcoinaverage.com/indices/global/ticker/BTC";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mPriceTextView = (TextView) findViewById(R.id.priceLabel);

Button btnUSD = (Button) findViewById(R.id.btnUSD);

Button btnZAR = (Button) findViewById(R.id.btnZAR);

Button btnAUD = (Button) findViewById(R.id.btnAUD);

//When clicking on this button, the bitcoin price is displayed in the

//mPriceTextView in USD

btnUSD.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

requestData(BASE_URL + "USD");

}

});

//When clicking on this button, the bitcoin price is displayed in the

//mPriceTextView in ZAR

btnZAR.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

requestData(BASE_URL + "ZAR");

}

});

//When clicking on this button, the bitcoin price is displayed in the

//mPriceTextView in AUD

btnAUD.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

requestData(BASE_URL + "AUD");

}

});

}

private void requestData(String url) {

RequestPackage requestPackage = new RequestPackage();

requestPackage.setMethod("GET");

requestPackage.setUrl(url);

Downloader downloader = new Downloader(); //Instantiation of the Async task

//that’s defined below

downloader.execute(requestPackage);

}

private class Downloader extends AsyncTask {

@Override

protected String doInBackground(RequestPackage... params) {

return HttpManager.getData(params[0])

}

//The String that is returned in the doInBackground() method is sent to the

// onPostExecute() method below. The String should contain JSON data.

@Override

protected void onPostExecute(String result) {

try {

//We need to convert the string in result to a JSONObject

JSONObject jsonObject = new JSONObject(result);

//The “ask” value below is a field in the JSON Object that was

//retrieved from the BitcoinAverage API. It contains the current

//bitcoin price

String price = jsonObject.getString("ask");

//Now we can use the value in the mPriceTextView

mPriceTextView.setText(price);

} catch (JSONException e) {

e.printStackTrace();

}

}

}

}

2-usul: Android Asynchronous HTTP Client

App / build.gradle fayliga o'ting va bog'liqliklar bo'limiga quyidagi kodni kiriting:

public class MainActivity extends AppCompatActivity {

private TextView mPriceTextView;

private String BASE_URL = "https://apiv2.bitcoinaverage.com/indices/global/ticker/BTC";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mPriceTextView = (TextView) findViewById(R.id.priceLabel);

Button btnUSD = (Button) findViewById(R.id.btnUSD);

Button btnZAR = (Button) findViewById(R.id.btnZAR);

Button btnAUD = (Button) findViewById(R.id.btnAUD);

//When clicking on this button, the bitcoin price is displayed in the

//mPriceTextView in USD

btnUSD.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

requestData(BASE_URL + "USD");

}

});

//When clicking on this button, the bitcoin price is displayed in the

//mPriceTextView in ZAR

btnZAR.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

requestData(BASE_URL + "ZAR");

}

});

//When clicking on this button, the bitcoin price is displayed in the

//mPriceTextView in AUD

btnAUD.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

requestData(BASE_URL + "AUD");

}

});

}

private void requestData(String url) {

//Everything below is part of the Android Asynchronous HTTP Client

AsyncHttpClient client = new AsyncHttpClient();

client.get(url, new JsonHttpResponseHandler() {

@Override

public void onSuccess(int statusCode, Header[] headers,

JSONObject response) {

// called when response HTTP status is "200 OK"

Log.d("Bitcoin", "JSON: " + response.toString());

try {

//The “ask” value below is a field in the JSON Object that was

//retrieved from the BitcoinAverage API. It contains the current

//bitcoin price

String price = response.getString("ask");

//Now we can use the value in the mPriceTextView

mPriceTextView.setText(price);

} catch (Exception e) {

Log.e("Bitcoin", e.toString());

}

}

@Override

public void onFailure(int statusCode, Header[] headers, Throwable e,

JSONObject response) {

// called when response HTTP status is "4XX" (eg. 401, 403, 404)

Log.d("Bitcoin", "Request fail! Status code: " + statusCode);

Log.d("Bitcoin", "Fail response: " + response);

Log.e("ERROR", e.toString());

Toast.makeText(MainActivity.this, "Request Failed",

Toast.LENGTH_SHORT).show();

}

});

}

}