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我对Android开发和Java非常新颖。目前，我有一个应用程序使用一些参数进行基本的HTTP POST请求。不同的HTTP POST在不同的类中使用相同的方法？
我想知道是否可以做2个活动，只是提出相同的请求，但具有不同的参数，不必粘贴相同的方法在2活动。
例如：我有两个屏幕，标识，当我按下每个屏幕上的按钮时，它会发送我用不同参数创建的发布请求。 PS：我所要求的可能不够具体，所以只要问我一些细节或代码（但我不认为这是必要的）。
编辑：我觉得我不好解释了我的thougts：d 我与该职位的静态函数的类：
公共类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();
}
}
和两个活动：
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);
}
}
和
公共类OtherClass扩展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.");
}
}
}
正如你看到的，在第二类中，发送不同的参数，我必须重新定义一个函数，我想知道它是否是唯一的选择（如果这样做不坏）。 如果我只能在这两个类中定义参数并提出请求。
Ofcourse你可以用不同的参数运行一个单一的方法，这就是OOP的目的。 – Skynet
您可以在不同的类（如util）中定义方法（在该调用http post中）并使用不同的参数从不同的活动中调用该方法 –