Question

我是Android开发和Java的新手。目前，我有一个应用程序，它使用一些参数发出基本的HTTP POST请求。

我想知道是否可以制作2个只提出相同请求但参数不同的活动，不必在2个活动中粘贴相同的方法。

示例：我有两个屏幕，相同，当我按下每个屏幕上的按钮时，它会发送我使用不同参数制作的发布请求。

PS：我的要求可能不够具体，所以请向我询问详细信息或一些代码（但我认为这里没有必要）。

编辑：我认为我严厉地解释了我的想法：D 我有一个带有静态函数的类：

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();
}

}

和两项活动：

公共类TestPost扩展了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

public class OtherClass扩展了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.");
    }
}

}

如你所见，在第二节课中，为了发送不同的参数，我必须重新定义这些功能，我想知道它是否是唯一的选择（如果它不坏的话）这样做）。就像我只能在两个班级中定义参数并提出请求一样。

Answer 1

如果我理解你，你可以这样做，如果你创建一个utils类，你可以粘贴方法（公共和你可以传递的参数），这两个活动相同，然后从活动中调用它们像这样：UtilsClass.sendPOSTRequest(myparam1, myparam2);

Answer 2

您应该创建一个pandas.read_csv类，其中包含执行HTTP POST的方法。该方法采用您的请求中不同的参数。然后创建此类的实例并将其传递给两个活动。

您的新NetworkService应包含所有与网络相关的方法以获得更好的架构，请参阅Separation of Concerns。

Answer 3

这需要一个NetworkUtils类！这将是一个您应该使用相同HTTP POST方法（您要在两个活动中定义的方法）静态使用的类，并调用公共静态方法。例如：

public class NetworkUtils{

    public static HttpResponse postData(String param1, String param2) {
        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");

        try {
            // Add your data
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("id", param1));
            nameValuePairs.add(new BasicNameValuePair("stringdata", param2));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request, return response
            return httpclient.execute(httppost);

        } catch (ClientProtocolException e) {
            e.printStacktrace();
        }catch (IOException e) {
            e.printStacktrace();
        }
        return null;
    }    
}

如果网络请求出现问题，请检查是否为空。除此之外，这只是您的解决方案的一个示例。（以节省额外的代码！）

注意：必须在AsyncThread或Handler中调用此方法，因为在发生这种情况时您将阻止UI线程。

Answer 4

创建一个全局类并定义你的http方法/方法并使它们保持静态！从任何地方使用它并根据需要传递参数

使用相同方法在不同类中使用不同的HTTP POST？

4 个答案: