目前，我已经在 android stdio 中完成了登录和注册 Activity ，但是当我尝试时，它将继续使用 Else 语句 in protected void onPostExecute(String result)
我已经尝试从显示的对话框中获取 result.equals 值，例如 LoginSuccessful 和 RegisterSuccessful，但也没有成功。
如果其他部分出现问题，我该怎么办？
我尝试过很多方式改变它，但仍然不起作用。
import XXXXXXXXXX;(skip import thing)
public class BackgroundWorker extends AsyncTask<String,Void,String> {
Context context;
AlertDialog alertDialog;
Intent intent;
BackgroundWorker (Context ctx) {
context = ctx;
}
@Override
protected String doInBackground(String... params) {
String type = params[0];
String login_url="http://XXX.XXX.XX.XXX:XX/login.php";
String register_url="http://XXX.XXX.XX.XXX:XX/register.php";
if(type.equals("login")) {
try {
String user_name = params[1];
String password = params[2];
URL url = new URL(login_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("user_name","UTF-8")+"="+URLEncoder.encode(user_name,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String result="";
String line="";
while((line = bufferedReader.readLine())!= null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}else if(type.equals("register")){
try {
String name = params[1];
String username = params[2];
String password = params[3];
String email = params[4];
String phonenum = params[5];
String age = params[6];
URL url = new URL(register_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("name","UTF-8")+"="+URLEncoder.encode(name,"UTF-8")+"&"
+URLEncoder.encode("username","UTF-8")+"="+URLEncoder.encode(username,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8")+"&"
+URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(email,"UTF-8")+"&"
+URLEncoder.encode("phonenum","UTF-8")+"="+URLEncoder.encode(phonenum,"UTF-8")+"&"
+URLEncoder.encode("age","UTF-8")+"="+URLEncoder.encode(age,"UTF-8")+"&";
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String result="";
String line="";
while((line = bufferedReader.readLine())!= null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Login Status");
}
@Override
protected void onPostExecute(String result) {
if(result.equals("LoginSuccessful")){
Intent intent = new Intent(context, Userprofile.class);
context.startActivity(intent);
}
if(result.equals("RegisterSuccessful")){
Intent intent = new Intent(context, MainActivity.class);
context.startActivity(intent);
}
else
{
alertDialog.setMessage(result);
alertDialog.show();
}
以下是我遇到的问题:
protected void onPostExecute(String result) {
if(result.equals("LoginSuccessful")){
Intent intent = new Intent(context, Userprofile.class);
context.startActivity(intent);
}
if(result.equals("RegisterSuccessful")){
Intent intent = new Intent(context, MainActivity.class);
context.startActivity(intent);
}
else
{
alertDialog.setMessage(result);
alertDialog.show();
}
如果没有记错的话，我认为问题是 if(result.equals("LoginSuccessful")) 中的值错误，或者我如何知道结果值(不是来自对话框)
最佳答案
正如您所建议的，问题很可能与 onPostExecute 方法中 result 的实际值有关。
您可以使用 Log.e(TAG,result); 记录 result 的值，然后在 Android Studio 的 Logcat 选项卡中查看日志。 onPostExecute 方法将变为:
protected void onPostExecute(String result) {
if(result.equals("LoginSuccessful")){
Intent intent = new Intent(context, Userprofile.class);
context.startActivity(intent);
}
if(result.equals("RegisterSuccessful")){
Intent intent = new Intent(context, MainActivity.class);
context.startActivity(intent);
}
else
{
Log.e(getClass().getSimpleName(), "Registration failed: " + result);
}
}
关于java - 如果选择login.activity或register.activity有问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57268768/