I am pretty new to Android developement and Java. Currently, I have an application that makes a basic HTTP POST request with a few parameters.
I would like to know if it is possible to make 2 activities that just make the same request but with different parameters, not having to paste the sames methods in the 2 activities.
Example: I have two screens, identics and when I press the button on each screen it sends the post request that I made with different parameters.
PS: What I ask may not be specific enough, so just ask me for details or some code (but I don't think it's necessary here).
Edit : I think I badly explained my thougts :D I have a class with static functions for the post :
public class MyHttpPost {
public static String performPostCall(String requestURL, HashMap<String, String> postDataParams) throws IOException {
InputStream is = null;
int len = 500;
URL url;
try {
url = new URL(requestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(15000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(getPostDataString(postDataParams));
writer.flush();
writer.close();
os.close();
is = conn.getInputStream();
return readIt(is, len);
} finally {
if (is != null) {
is.close();
}
}
}
public static String readIt(InputStream stream, int len) throws IOException {
Reader reader = new InputStreamReader(stream, "UTF-8");
char[] buffer = new char[len];
reader.read(buffer);
return new String(buffer);
}
private static String getPostDataString(HashMap<String, String> params) throws UnsupportedEncodingException {
StringBuilder result = new StringBuilder();
boolean first = true;
for( Map.Entry<String, String> entry : params.entrySet() ) {
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
}
return result.toString();
}
}
and two activities :
public class TestPost extends AppCompatActivity {
public final static String EXTRA_MESSAGE = "MESSAGE";
private TextView myView;
private EditText urlText;
HashMap<String, String> postDataParams;
WebView webview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_post);
myView = (TextView)findViewById(R.id.myText);
urlText = (EditText)findViewById(R.id.myUrl);
postDataParams = new HashMap<>();
postDataParams.put("firstParam", "1234");
postDataParams.put("secondParam", "qwerty");
webview = new WebView(this);
webview = (WebView) findViewById(R.id.myWebView);
}
public void sendMessage(View view) {
Intent intent = new Intent(this, Home.class);
TextView editTextview = (TextView) findViewById(R.id.myText);
String message = editTextview.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
protected class DownloadWebpageTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
// params comes from the execute() call: params[0] is the url.
try {
return MyHttpPost.performPostCall(urls[0], postDataParams);
} catch (IOException e) {
return getResources().getString(R.string.bad_url);
}
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
myView.setText(result);
webview.loadData(result, "text/html", null);
}
}
// When user clicks button, calls AsyncTask.
// Before attempting to fetch the URL, makes sure that there is a network connection.
public void myClickHandler(View view) {
// Gets the URL from the UI's text field.
String stringUrl = urlText.getText().toString();
ConnectivityManager connMgr = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
new DownloadWebpageTask().execute(stringUrl);
} else {
myView.setText("No network connection available.");
}
}
@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_test_post, 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);
}
}
and
public class OtherClass extends TestPost {
private TextView myView;
private EditText urlText;
HashMap<String, String> postDataParams;
WebView webview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_post);
myView = (TextView)findViewById(R.id.myText);
urlText = (EditText)findViewById(R.id.myUrl);
myView.setText("coucou");
postDataParams = new HashMap<>();
postDataParams.put("firstParam", "9876");
postDataParams.put("secondParam", "ytreza");
webview = new WebView(this);
webview = (WebView) findViewById(R.id.myWebView);
}
protected class DownloadWebpageTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
// params comes from the execute() call: params[0] is the url.
try {
return MyHttpPost.performPostCall(urls[0], postDataParams);
} catch (IOException e) {
return getResources().getString(R.string.bad_url);
}
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
myView.setText(result);
webview.loadData(result, "text/html", null);
}
}
public void myClickHandler(View view) {
// Gets the URL from the UI's text field.
String stringUrl = urlText.getText().toString();
ConnectivityManager connMgr = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
new DownloadWebpageTask().execute(stringUrl);
} else {
myView.setText("No network connection available.");
}
}
}
As you see, in the second class, to send different parameters, I must redefine a the functions, and I would like to know if it's the only option (and if it's not bad to do so). Like if I could only in the two class only define the params and make the request.
