在我的应用程序中，我想实现一个登录功能来访问服务器以获取所有必要的API集合。登录请求将通过POST方法发送。对于登录，电子邮件地址是必填字段，密码是可选的。如果我使用电子邮件地址进行身份验证，我可以从服务器获取所有api colection，例如“/ api / users”，“api / image”。此外，该应用程序将重定向到下一页。我尝试使用以下代码通过POSt方法从服务器进行身份验证。但代码没有任何反应。我既没有从服务器获得任何回复，也没有重定向到下一页。我的代码似乎有些问题。但我无法解决究竟是什么问题。
在此我想提一下，我不想使用任何库进行网址连接
这是我登录页面的代码
public class LoginPage extends AppCompatActivity {
private UserLoginTask mAuthTask = null;
EditText userEmail;
EditText userPassword;
TextView forgotPassword;
View progressView;
View loginFormView;
Button login;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_layout);
//Set up the login form
userEmail=(EditText)findViewById(R.id.email);
userPassword=(EditText)findViewById(R.id.password);
forgotPassword=(TextView)findViewById(R.id.forgot_password);
forgotPassword.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getBaseContext(),"Redirect to forgot password link",Toast.LENGTH_SHORT).show();
}
});
userPassword.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
if (id == R.id.password || id == EditorInfo.IME_NULL) {
attemptLogin();
return true;
}
return false;
}
});
login=(Button)findViewById(R.id.btn_login);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
attemptLogin();
}
});
loginFormView = findViewById(R.id.login_form);
progressView = findViewById(R.id.login_progress);
}
/**
* Attempts to sign in or register the account specified by the login form.
* If there are form errors (invalid email, missing fields, etc.), the
* errors are presented and no actual login attempt is made.
*/
private void attemptLogin() {
if (mAuthTask != null) {
return;
}
// Reset errors.
userEmail.setError(null);
userPassword.setError(null);
String email = userEmail.getText().toString();
String password = userPassword.getText().toString();
boolean cancel = false;
View focusView = null;
// Check for a valid password, if the user entered one.
if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
userPassword.setError(getString(R.string.error_invalid_password));
focusView = userPassword;
cancel = true;
}
else if(TextUtils.isEmpty(password)){
userPassword.setError(getString(R.string.error_field_required));
focusView = userPassword;
cancel = true;
}
// Check for a valid email address.
if (TextUtils.isEmpty(email)) {
userEmail.setError(getString(R.string.error_field_required));
focusView = userEmail;
cancel = true;
} else if (!isEmailValid(email)) {
userEmail.setError(getString(R.string.error_invalid_email));
focusView = userEmail;
cancel = true;
}
if (cancel) {
// There was an error; don't attempt login and focus the first
// form field with an error.
focusView.requestFocus();
} else {
// Show a progress spinner, and kick off a background task to
// perform the user login attempt.
showProgress(true);
mAuthTask = new UserLoginTask(email, password,this);
mAuthTask.execute((Void) null);
}
}
private boolean isEmailValid(String email) {
//TODO: Replace this with other logic
Pattern pattern = Patterns.EMAIL_ADDRESS;
return pattern.matcher(email).matches();
//return true;
}
private boolean isPasswordValid(String password) {
//TODO: Replace this with your own logic
return password.length() > 4;
}
/**
* Shows the progress UI and hides the login form.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
private void showProgress(final boolean show) {
// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
// for very easy animations. If available, use these APIs to fade-in
// the progress spinner.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
loginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
loginFormView.animate().setDuration(shortAnimTime).alpha(
show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
loginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
});
progressView.setVisibility(show ? View.VISIBLE : View.GONE);
progressView.animate().setDuration(shortAnimTime).alpha(
show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
progressView.setVisibility(show ? View.VISIBLE : View.GONE);
}
});
} else {
// The ViewPropertyAnimator APIs are not available, so simply show
// and hide the relevant UI components.
progressView.setVisibility(show ? View.VISIBLE : View.GONE);
loginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
}
private interface ProfileQuery {
String[] PROJECTION = {
ContactsContract.CommonDataKinds.Email.ADDRESS,
ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
};
int ADDRESS = 0;
int IS_PRIMARY = 1;
}
/**
* Represents an asynchronous login/registration task used to authenticate
* the user.
*/
public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
private final String mEmail;
private final String mPassword;
Activity instance;
UserLoginTask(String email, String password,Activity instance) {
mEmail = email;
mPassword = password;
this.instance=instance;
}
@Override
protected Boolean doInBackground(Void... params) {
// TODO: attempt authentication against a network service.
JSONObject request = new JSONObject();
try {
request.put("email",mEmail );
} catch (JSONException e) {
e.printStackTrace();
}
try {
request.put("pass",mPassword );
} catch (JSONException e) {
e.printStackTrace();
}
String result = connectWithServer(instance , request,mEmail,mPassword);
if(!TextUtils.isEmpty(result)){
return true;
}else{
return false;
}
}
@Override
protected void onPostExecute(final Boolean success) {
mAuthTask = null;
showProgress(true);
if (success) {
finish();
Intent loginIntent = new Intent(LoginPage.this, MainOptionPage.class);
startActivity(loginIntent);
} else {
userEmail.setError(getString(R.string.error_incorrect_password));
userPassword.requestFocus();
}
}
@Override
protected void onCancelled() {
mAuthTask = null;
showProgress(false);
}
}
public static String connectWithServer(Activity ctx , JSONObject request, String username, String password) {
String result ="";
try {
//Connect
HttpURLConnection urlConnection = (HttpURLConnection) ((new URL("https://myurl/login")).openConnection());
urlConnection.setDoOutput(true);
urlConnection.setRequestProperty("Content-Type","application/json");
urlConnection.setRequestProperty("Accept","application/json");
urlConnection.setRequestMethod("POST");
urlConnection.connect();
urlConnection.setConnectTimeout(100000);
//Write
OutputStream outputStream = urlConnection.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
writer.write(request.toString());
writer.close();
outputStream.close();
//Read
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "UTF-8"));
String line;
StringBuilder sb = new StringBuilder();
while ((line = bufferedReader.readLine()) != null) {
sb.append(line);
}
bufferedReader.close();
result = sb.toString();
Toast.makeText(ctx,result,Toast.LENGTH_LONG).show();
} catch (UnsupportedEncodingException e){
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
}