在當(dāng)前的互聯(lián)網(wǎng)時(shí)代，移動(dòng)互聯(lián)網(wǎng)已經(jīng)成為最具潛力和前景的市場(chǎng)，人們?cè)谶M(jìn)行生活和工作中難免需要使用手機(jī)來(lái)進(jìn)行一些操作，同時(shí)，隨著互聯(lián)網(wǎng)技術(shù)的發(fā)展，Web與App之間的數(shù)據(jù)交互顯得越來(lái)越重要。因此，掌握Android與php之間數(shù)據(jù)交互的技術(shù)，對(duì)于開(kāi)發(fā)人員來(lái)說(shuō)是十分必要的。 Android是一種使用Java編程語(yǔ)言開(kāi)發(fā)的開(kāi)放源代碼的操作系統(tǒng)。而php是一種被廣泛應(yīng)用于Web環(huán)境中的腳本語(yǔ)言。Android與php之間數(shù)據(jù)交互可以通過(guò)http請(qǐng)求實(shí)現(xiàn)，例如使用httpUrlConnection來(lái)發(fā)送http請(qǐng)求，通過(guò)request方法監(jiān)控服務(wù)器數(shù)據(jù)的返回。以下是一種示例代碼的布局：

private String uploadData(String urlString, String params) throws Exception {
URL url = new URL(urlString);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("User-Agent", "Android Multipart HTTP Client 1.0");
httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
bufferedWriter.write(params);
bufferedWriter.flush();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
StringBuffer response = new StringBuffer();
String line;
while ((line = bufferedReader.readLine()) != null) {
response.append(line);
response.append('\r');
}
bufferedReader.close();
return response.toString();
}

在進(jìn)行數(shù)據(jù)交互時(shí)，需要保證服務(wù)器的接口設(shè)計(jì)合理，同時(shí)保證Android端的請(qǐng)求參數(shù)與服務(wù)器端的返回值保持一致和有意義。例如，在進(jìn)行用戶登錄時(shí)，若用戶輸入錯(cuò)誤的賬號(hào)或密碼，則服務(wù)器端需要返回提示信息，而Android客戶端需要根據(jù)服務(wù)器端返回的值來(lái)進(jìn)行后續(xù)的判斷。以下是一種示例代碼的布局：

public static final String LOGIN_URL = "http://192.168.1.2/login.php";
private EditText userName;
private EditText userPassword;
private class LoginTask extends AsyncTask{
String username = "";
String password = "";
@Override
protected void onPreExecute() {
super.onPreExecute();
username = userName.getText().toString();
password = userPassword.getText().toString();
}
@Override
protected String doInBackground(String... strings) {
String response = null;
String params = "username=" + username + "&password=" + password;
try {
response = uploadData(strings[0], params);
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
if (s == null) {
Toast.makeText(getApplicationContext(),"網(wǎng)絡(luò)連接失敗，請(qǐng)檢查您的網(wǎng)絡(luò)",Toast.LENGTH_LONG).show();
return;
}
if (s == "1") {
startActivity(new Intent(getApplicationContext(), MainActivity.class));
} else {
Toast.makeText(getApplicationContext(),"用戶名或密碼錯(cuò)誤！",Toast.LENGTH_LONG).show();
}
}
}
public void login(View view) {
new LoginTask().execute(LOGIN_URL);
}

在以上示例代碼中，onPreExecute方法中獲取了用戶輸入的賬號(hào)和密碼，在doInBackground方法中進(jìn)行數(shù)據(jù)交互，最后在onPostExecute方法中根據(jù)服務(wù)器端返回值進(jìn)行相應(yīng)的操作。 總之，Android與php之間的數(shù)據(jù)交互不僅需要在Android端掌握http請(qǐng)求的基本知識(shí)，還需要在服務(wù)器端進(jìn)行接口設(shè)計(jì)，同時(shí)注意Android客戶端請(qǐng)求參數(shù)和服務(wù)器端返回值的保持一致和有意義。只要掌握了這些技術(shù)，就能大大方便開(kāi)發(fā)人員的應(yīng)用開(kāi)發(fā)工作。