我有一个片段，其中，我使用后台线程从服务器加载一些数据并使用“runOnUiThread”更新UI。但是它给出了错误“片段未附加到活动”。 我该如何解决这个问题？
代码： -
AsyncTask.execute(new Runnable() {
@Override
public void run() {
/*Checking whether user is loggedin or not*/
if (loginSessionManager.isLogin()) {
/*Creating object of "CServerRequest" class*/
cServerRequest = new CServerRequest(mContext);
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject();
jsonObject.put(CRequestKey.AGENT_CODE, m_szMobileNumber.trim());
jsonObject.put(CRequestKey.PIN, m_szEncryptedPassword.trim());
if (BuildConfig.kDebugInfo)
Log.d(TAG, "Request::" + jsonObject);
} catch (JSONException e) {
e.printStackTrace();
}
if (isAdded()) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
m_loading_layout.setVisibility(View.VISIBLE);
}
});
}
String s_szWalletURL = CAPIStorage.IREWARDS_URL + CAPIStorage.WALLET_BALANCE_URL;
cServerRequest.postWalletRequest("POST", s_szWalletURL, jsonObject);
/*Handling server response and error here*/
cServerRequest.setCallBackListener(new CServerRequest.IResult() {
@Override
public void notifySuccess(String requestType, JSONObject response) {
if (BuildConfig.kDebugInfo)
Log.d(TAG, "Response::" + response);
try {
int nResultCodeFromServer = Integer.parseInt(response.getString(CResponseKey.GENERAL_RESULT_CODE));
if (nResultCodeFromServer == ConstantInt.TRANSACTION_SUCCESS) {
if (isAdded()) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
m_loading_layout.setVisibility(View.GONE);
m_ErrorLayout.setVisibility(View.GONE);
m_walletHeading.setVisibility(View.VISIBLE);
m_SuccessLayout.setVisibility(View.VISIBLE);
}
});
}
String s_szWalletBalance = response.getString(CResponseKey.WALLET_BALANCE).trim();// get wallet balance fro response
String trimwalletBalance = s_szWalletBalance.substring(0, s_szWalletBalance.indexOf("."));// trim waalet balance from response.
CWalletDataModel.getInstance().setS_szWalletBalance(trimwalletBalance);// set wallet balance
// showing wallet balance here from ui thread.
if (isAdded()) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
if (m_szCountryCode.equalsIgnoreCase(CResponseKey.COUNTRY_INDIA)) {
m_currency.setText(getString(string.ruppes_symbol));
} else {
m_currency.setText(getString(string.currency_dollar));
}
m_points.setText(CWalletDataModel.getInstance().getS_szWalletBalance());
if (m_szCountryCode.equalsIgnoreCase(CResponseKey.COUNTRY_INDIA)) {
/*If found indian user then show conversion of points in rupees*/
amountConversionIndia();
} else {
/*If found non-indian then will show conversion of points in doller*/
amountConversionInternational();
}
}
});
}
/*Connection lost error*/
} else if (nResultCodeFromServer == ConstantInt.CONNECTION_LOST) {
if (isAdded()) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
m_loading_layout.setVisibility(View.GONE);
m_ErrorLayout.setVisibility(View.VISIBLE);
m_walletHeading.setVisibility(View.GONE);
m_ErrorText.setText(getResources().getString(string.connection_lost));
m_ErrorText.setText(getResources().getString(string.retry));
}
});
}
/*Timed out error from response*/
} else if (nResultCodeFromServer == ConstantInt.TIMED_OUT) {
if (isAdded()) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
m_loading_layout.setVisibility(View.GONE);
m_ErrorLayout.setVisibility(View.VISIBLE);
m_walletHeading.setVisibility(View.GONE);
m_ErrorText.setText(getResources().getString(string.connection_timed_out));
m_ErrorBtn.setText(getResources().getString(string.retry_text));
}
});
}
/*Technical failure response from server*/
} else if (nResultCodeFromServer == ConstantInt.TECHNICAL_FAILURE) {
if (isAdded()) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
m_loading_layout.setVisibility(View.GONE);
m_ErrorLayout.setVisibility(View.VISIBLE);
m_walletHeading.setVisibility(View.GONE);
m_ErrorText.setText(getResources().getString(string.technical_failure));
m_ErrorBtn.setText(getResources().getString(string.retry_text));
}
});
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void notifyError(String requestType, VolleyError error) {
if (BuildConfig.kDebugInfo)
Log.d(TAG, "Error::" + error);
if (isAdded()) {
/*Time out volley error*/
if (error instanceof TimeoutError) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
m_loading_layout.setVisibility(View.GONE);
m_ErrorLayout.setVisibility(View.VISIBLE);
m_walletHeading.setVisibility(View.GONE);
m_ErrorText.setText(getResources().getString(string.connection_timed_out));
m_ErrorBtn.setText(getResources().getString(string.retry_text));
}
});
/*Network volley error*/
}
}
if (isAdded()) {
if (error instanceof NetworkError) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
m_loading_layout.setVisibility(View.GONE);
m_ErrorLayout.setVisibility(View.VISIBLE);
m_walletHeading.setVisibility(View.GONE);
m_ErrorText.setText(getResources().getString(string.unable_to_connect_text));
m_ErrorBtn.setText(getResources().getString(string.retry));
}
});
}
}
}
});
} else {
if (isAdded()) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
if (isAdded()) {
m_loading_layout.setVisibility(View.GONE);
m_ErrorLayout.setVisibility(View.VISIBLE);
m_ErrorText.setText(mContext.getResources().getString(string.please_log_into_your_account));
m_ErrorBtn.setText(getResources().getString(string.login_btn_text));
}
}
});
}
}
}
});
}
答案 0 :(得分：0)
此问题的解决方案应该取消onStop（）中的asynctask。 你也没有介绍内存泄漏的问题。
@Override
public void onStop() {
super.onStop();
mYourAsyncTask.cancel(true);
}