我需要一些帮助。这是我的活动登录，当点击登录按钮时，他给了我一个错误：com.android.volley.NoConnectionError:java.net.ConnectException:Connection refused。我使用 2 个权限<uses-permission android:name="android.permission.INTERNET"/><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>有我的登录代码，在顶部我们有变量：private EditText mPasswordView, mUserName; private ProgressBar loading; private Button btnLogin; private static String URL_LOGIN = "http://localhost/ligacao_bd/login.php"; private View mProgressView; private View mLoginFormView;有我的按钮登录设置：@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); loading = findViewById(R.id.loading); // Set up the login form. mUserName = (EditText) findViewById(R.id.textUserName); mPasswordView = (EditText) findViewById(R.id.textPassword); btnLogin = (Button) findViewById(R.id.btnLogin); // login button btnLogin.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { String email = mUserName.getText().toString().trim(); String Pwd = mPasswordView.getText().toString().trim(); if(!email.isEmpty() || !Pwd.isEmpty()){ Login(email, Pwd); }else{ mUserName.setError("Insira nome de utilizador"); mPasswordView.setError("Insira palavra-passe"); } } });
3 回答
哔哔one
TA贡献1854条经验 获得超8个赞
假设您在 Android 模拟器上运行此代码，并且您调用的任何后端服务也在 localhost 上运行，请将您的登录地址更改为：
//8080 being the port that localhost is assigned to - change it if needs be
private static String URL_LOGIN = "http://10.0.2.2:8080/ligacao_bd/login.php";
http://10.0.2.2:xxxx是作为主机环回接口的特殊别名的 IP（开发机器上的 127.0.0.1）
海绵宝宝撒
TA贡献1809条经验 获得超8个赞
这是一个使用 volley 的工作字符串请求。根据需要更改此设置。如果它不起作用，那么问题出在您的 login.php 方面
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
StringRequest request = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>(){
@Override
public void onResponse(String s) {
if(s.equals("Logged In")){
Intent intent = new Intent(Login.this, Home.class);
startActivity(intent);
}
else{
Toast.makeText(Login.this, "Incorrect Details", Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener(){
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(Login.this, "Some error occurred -> "+volleyError, Toast.LENGTH_LONG).show();;
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> parameters = new HashMap<String, String>();
parameters.put("email", emailBox.getText().toString());
parameters.put("password", passwordBox.getText().toString());
return parameters;
}
};
RequestQueue rQueue = Volley.newRequestQueue(Login.this);
rQueue.add(request);
}
});
红颜莎娜
TA贡献1842条经验 获得超13个赞
您还需要在代码中请求权限。请参阅：https ://developer.android.com/training/permissions/requesting
在发出 Web 请求之前，您只需要添加此代码：
requestPermission(Manifest.permission.INTERNET, PERMISSION_INTERNET);
requestPermission(Manifest.permission.ACCESS_NETWORK_STATE, PERMISSION_ACCESS_NETWORK_STATE);
在其他地方这段代码：
private static final int PERMISSION_INTERNET = 1;
private static final int PERMISSION_ACCESS_NETWORK_STATE = 2;
private void requestPermission(Manifest.permission permission, int requestId) {
if (ContextCompat.checkSelfPermission(thisActivity,
permission)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(thisActivity,
new String[]{permission},
requestId);
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_INTERNET: {
if (grantResults.length <= 0
|| grantResults[0] != PackageManager.PERMISSION_GRANTED) {
requestPermission(Manifest.permission.INTERNET, PERMISSION_INTERNET);
}
return;
}
case PERMISSION_ACCESS_NETWORK_STATE: {
if (grantResults.length <= 0
|| grantResults[0] != PackageManager.PERMISSION_GRANTED) {
requestPermission(Manifest.permission.ACCESS_NETWORK_STATE, PERMISSION_ACCESS_NETWORK_STATE);
}
return;
}
}
}
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