为了加载阿里云国际站的充值页面,需要做以下步骤:
- 创建一个 AsyncTask 类,在 doInBackground() 方法中进行网络请求,获取到需要的充值页面数据。
- 然后在 onPostExecute() 方法中解析数据,并在 UI 线程中更新界面。
下面是一个简单的示例代码:
public class RechargeActivity extends AppCompatActivity {
private TextView tvAmount;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recharge);
tvAmount = findViewById(R.id.tv_amount);
new LoadRechargeData().execute();
}
private class LoadRechargeData extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... voids) {
// 执行网络请求,获取充值页面数据
String url = "https://www.alibabacloud.com/recharge";
String result = "";
try {
URL urlObj = new URL(url);
HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(15000);
conn.setConnectTimeout(15000);
conn.connect();
InputStream inputStream = conn.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder stringBuilder = new StringBuilder();
String line = "";
while ((line = bufferedReader.readLine()) != null) {
stringBuilder.append(line).append("n");
}
result = stringBuilder.toString();
bufferedReader.close();
inputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
@Override
protected void onPostExecute(String result) {
// 解析数据,并更新界面
Document doc = Jsoup.parse(result);
Element amountDiv = doc.select("div[id=amount]").first();
String amount = amountDiv.text();
tvAmount.setText(amount);
}
}
}
在这个示例代码中,我们使用 Jsoup 库来解析 HTML 页面,并在 TextView 中显示充值金额。注意,在 doInBackground() 方法中执行网络请求,最终在 onPostExecute() 方法中更新界面。
- 添加网络权限
在 AndroidManifest.xml 文件中添加网络权限:
<uses-permission android:name="android.permission.INTERNET" />
- 创建网络请求工具类
在项目中创建一个网络请求工具类,用于封装网络请求的逻辑。可以使用 Volley 或 Okhttp 等第三方库来实现网络请求。
下面以 Volley 为例:
![阿里云国际站充值:android 加载网络数据](https://www.jintuiyun.com/wp-content/themes/justnews/themer/assets/images/lazy.png)
public class VolleyRequest {
private static final String TAG = "VolleyRequest";
private static VolleyRequest sInstance;
private RequestQueue mRequestQueue;
private Context mContext;
private VolleyRequest(Context context) {
mContext = context.getApplicationContext();
mRequestQueue = getRequestQueue();
}
public static synchronized VolleyRequest getInstance(Context context) {
if (sInstance == null) {
sInstance = new VolleyRequest(context);
}
return sInstance;
}
private RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(mContext.getApplicationContext());
}
return mRequestQueue;
}
public void request(String url, final Callback callback) {
StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (callback != null) {
callback.onSuccess(response);
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (callback != null) {
callback.onFailure(error.getMessage());
}
}
});
stringRequest.setTag(TAG);
mRequestQueue.add(stringRequest);
}
public interface Callback {
void onSuccess(String response);
void onFailure(String error);
}
}
- 加载数据
在需要加载数据的 Activity 或 Fragment 中,调用网络请求工具类的方法来加载数据。例如:
public class MainActivity extends AppCompatActivity {
private TextView mTextView;
private VolleyRequest mVolleyRequest;
private static final String URL = "http://aliyun.com";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView = findViewById(R.id.text_view);
mVolleyRequest = VolleyRequest.getInstance(this);
loadData();
}
private void loadData() {
mVolleyRequest.request(URL, new VolleyRequest.Callback() {
@Override
public void onSuccess(String response) {
mTextView.setText(response);
}
@Override
public void onFailure(String error) {
Toast.makeText(MainActivity.this, "加载失败:" + error, Toast.LENGTH_SHORT).show();
}
});
}
}
发布者:luotuoemo,转转请注明出处:https://www.jintuiyun.com/159359.html