Question

我有我的MainActivity和LoginActivity。我可以毫无问题地调用每个方法，但是当我尝试单击“btnLogin”或“btnLinkToRegister”按钮时，没有任何反应。

LoginActivity

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

import com.test.music.myapplication.MainActivity;
import com.test.music.myapplication.R;
import com.test.music.myapplication.app.LoginConfig;
import com.test.music.myapplication.app.LoginController;
import com.test.music.myapplication.helper.SQLiteHandler;
import com.test.music.myapplication.helper.SessionManager;

public class LoginActivity extends Activity{
    private static final String TAG = RegisterActivity.class.getSimpleName();
    private Button btnLogin;
    private Button btnLinkToRegister;
    private EditText inputEmail;
    private EditText inputPassword;
    private ProgressDialog pDialog;
    private SessionManager session;
    private SQLiteHandler db;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login_fragment);

        inputEmail = (EditText) findViewById(R.id.email);
        inputPassword = (EditText) findViewById(R.id.password);
        btnLogin = (Button) findViewById(R.id.btnLogin);
        btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);

        // Progress dialog
        pDialog = new ProgressDialog(this);
        pDialog.setCancelable(false);

        // SQLite database handler
        db = new SQLiteHandler(getApplicationContext());

        // Session manager
        session = new SessionManager(getApplicationContext());

        // Check if user is already logged in or not
        if (session.isLoggedIn()) {
            // User is already logged in. Take him to main activity
            Intent intent = new Intent(LoginActivity.this, MainActivity.class);
            startActivity(intent);
            finish();
        }

        // Login button Click Event
        /*btnLogin.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                String email = inputEmail.getText().toString().trim();
                String password = inputPassword.getText().toString().trim();

                // Check for empty data in the form
                if (!email.isEmpty() && !password.isEmpty()) {
                    // login user
                    checkLogin(email, password);
                } else {
                    // Prompt user to enter credentials
                    Toast.makeText(getApplicationContext(),
                            "Please enter the credentials!", Toast.LENGTH_LONG)
                            .show();
                }
            }

        });

        // Link to Register Screen
        btnLinkToRegister.setOnClickListener(new OnClickListener() {

            public void onClick(View view) {
                Intent i = new Intent(getApplicationContext(),
                        RegisterActivity.class);
                startActivity(i);
                finish();
            }
        });*/

    }

    /**
     * function to verify login details in mysql db
     * */
    public void checkLogin(final String email, final String password) {
        // Tag used to cancel the request
        String tag_string_req = "req_login";

        pDialog.setMessage("Logging in ...");
        showDialog();

        StringRequest strReq = new StringRequest(Method.POST,
                LoginConfig.URL_LOGIN, new Response.Listener<String>() {

            @Override
            public void onResponse(String response) {
                Log.d(TAG, "Login Response: " + response.toString());
                hideDialog();

                try {
                    JSONObject jObj = new JSONObject(response);
                    boolean error = jObj.getBoolean("error");

                    // Check for error node in json
                    if (!error) {
                        // user successfully logged in
                        // Create login session
                        session.setLogin(true);

                        // Now store the user in SQLite
                        String uid = jObj.getString("uid");

                        JSONObject user = jObj.getJSONObject("user");
                        String name = user.getString("name");
                        String email = user.getString("email");
                        String created_at = user
                                .getString("created_at");

                        // Inserting row in users table
                        db.addUser(name, email, uid, created_at);

                        // Launch main activity
                        Intent intent = new Intent(LoginActivity.this,
                                MainActivity.class);
                        startActivity(intent);
                        finish();
                    } else {
                        // Error in login. Get the error message
                        String errorMsg = jObj.getString("error_msg");
                        Toast.makeText(getApplicationContext(),
                                errorMsg, Toast.LENGTH_LONG).show();
                    }
                } catch (JSONException e) {
                    // JSON error
                    e.printStackTrace();
                    Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
                }

            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Login Error: " + error.getMessage());
                Toast.makeText(getApplicationContext(),
                        error.getMessage(), Toast.LENGTH_LONG).show();
                hideDialog();
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                // Posting parameters to login url
                Map<String, String> params = new HashMap<String, String>();
                params.put("email", email);
                params.put("password", password);

                return params;
            }

        };

        // Adding request to request queue
        LoginController.getInstance().addToRequestQueue(strReq, tag_string_req);
    }

    private void showDialog() {
        if (!pDialog.isShowing())
            pDialog.show();
    }

    private void hideDialog() {
        if (pDialog.isShowing())
            pDialog.dismiss();
    }

    public Button getBtnLogin() {
        return btnLogin;
    }

    public Button getBtnLinkToRegister() {
        return btnLinkToRegister;
    }

    public void setBtnLogin(Button btnLogin) {
        this.btnLogin = btnLogin;
    }

    public void setBtnLinkToRegister(Button btnLinkToRegister) {
        this.btnLinkToRegister = btnLinkToRegister;
    }



    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}

LoginFragment

import android.app.ProgressDialog;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.test.music.myapplication.activity.LoginActivity;
import com.test.music.myapplication.activity.RegisterActivity;
import com.test.music.myapplication.helper.SQLiteHandler;
import com.test.music.myapplication.helper.SessionManager;

public class LoginFragment extends Fragment {
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";
    private String mParam1;
    private String mParam2;
    private Button btnLogin;
    private Button btnLinkToRegister;
    private EditText inputEmail;
    private EditText inputPassword;
    private ProgressDialog pDialog;
    private SessionManager session;
    private SQLiteHandler db;
    private static final String TAG = RegisterActivity.class.getSimpleName();
    LoginActivity Log = new LoginActivity();


    private OnFragmentInteractionListener mListener;

    public LoginFragment() {
        // Required empty public constructor
    }

    public static LoginFragment newInstance(String param1, String param2) {
        LoginFragment fragment = new LoginFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    public void onCreate() {
        //super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }

        // Login button Click Event
        btnLogin.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                String email = inputEmail.getText().toString().trim();
                String password = inputPassword.getText().toString().trim();

                if (!email.isEmpty() && !password.isEmpty()) {
                    Log.checkLogin(email, password);
                } else {
                    Toast.makeText(Log.getApplicationContext(),
                            "Please enter the credentials!", Toast.LENGTH_LONG)
                            .show();
                }
            }

        });
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.login_fragment, container, false);
    }

    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}

login_fragment

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.test.music.myapplication.LoginFragment"
    android:background="@color/bg_login"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="0dp" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical"
        android:paddingLeft="0dp"
        android:paddingRight="0dp" >

        <EditText
            android:id="@+id/email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:background="@color/white"
            android:hint="@string/hint_email"
            android:inputType="textEmailAddress"
            android:padding="10dp"
            android:textColor="@color/input_login"
            android:textColorHint="@color/input_login_hint" />

        <EditText
            android:id="@+id/password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:background="@color/white"
            android:hint="@string/hint_password"
            android:inputType="textPassword"
            android:padding="10dp"
            android:textColor="@color/input_login"
            android:textColorHint="@color/input_login_hint" />

        <!-- Login Button -->

        <Button
            android:id="@+id/btnLogin"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dip"
            android:background="@color/btn_login_bg"
            android:text="@string/btn_login"
            android:textColor="@color/btn_login" />

        <!-- Link to Login Screen -->

        <Button
            android:id="@+id/btnLinkToRegisterScreen"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dip"
            android:background="@null"
            android:text="@string/btn_link_to_register"
            android:textAllCaps="false"
            android:textColor="@color/white"
            android:textSize="15dp" />

    </LinearLayout>

</FrameLayout>

logcat的

06-08 14:47:56.703 18829-18829/? I/art: Late-enabling -Xcheck:jni
06-08 14:47:56.734 18829-18829/? D/TidaProvider: TidaProvider()
06-08 14:47:56.766 18829-18829/app.myapplication W/ActivityThread: Application app.myapplication is waiting for the debugger on port 8100...
06-08 14:47:56.769 18829-18829/app.myapplication I/System.out: Sending WAIT chunk
06-08 14:47:56.958 18829-18835/app.myapplication I/art: Debugger is active
06-08 14:47:56.971 18829-18829/app.myapplication I/System.out: Debugger has connected
06-08 14:47:56.971 18829-18829/app.myapplication I/System.out: waiting for debugger to settle...
06-08 14:47:57.171 18829-18829/app.myapplication I/System.out: waiting for debugger to settle...
06-08 14:47:57.371 18829-18829/app.myapplication I/System.out: waiting for debugger to settle...
06-08 14:47:57.571 18829-18829/app.myapplication I/System.out: waiting for debugger to settle...
06-08 14:47:57.772 18829-18829/app.myapplication I/System.out: waiting for debugger to settle...
06-08 14:47:57.972 18829-18829/app.myapplication I/System.out: waiting for debugger to settle...
06-08 14:47:58.172 18829-18829/app.myapplication I/System.out: waiting for debugger to settle...
06-08 14:47:58.372 18829-18829/app.myapplication I/System.out: waiting for debugger to settle...
06-08 14:47:58.572 18829-18829/app.myapplication I/System.out: debugger has settled (1478)
06-08 14:47:58.585 18829-18829/app.myapplication W/System: ClassLoader referenced unknown path: /data/app/app.myapplication-1/lib/arm64
06-08 14:47:58.700 18829-18829/app.myapplication V/BoostFramework: mAcquireFunc method = public int com.qualcomm.qti.Performance.perfLockAcquire(int,int[])
06-08 14:47:58.700 18829-18829/app.myapplication V/BoostFramework: mReleaseFunc method = public int com.qualcomm.qti.Performance.perfLockRelease()
06-08 14:47:58.700 18829-18829/app.myapplication V/BoostFramework: mAcquireTouchFunc method = public int com.qualcomm.qti.Performance.perfLockAcquireTouch(android.view.MotionEvent,android.util.DisplayMetrics,int,int[])
06-08 14:47:58.700 18829-18829/app.myapplication V/BoostFramework: mIOPStart method = public int com.qualcomm.qti.Performance.perfIOPrefetchStart(int,java.lang.String)
06-08 14:47:58.700 18829-18829/app.myapplication V/BoostFramework: mIOPStop method = public int com.qualcomm.qti.Performance.perfIOPrefetchStop()
06-08 14:47:58.704 18829-18829/app.myapplication V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@f8b3883
06-08 14:47:58.704 18829-18829/app.myapplication V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@1d12a00
06-08 14:47:58.704 18829-18829/app.myapplication V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@cdb1239
06-08 14:47:58.704 18829-18829/app.myapplication V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@9ea507e
06-08 14:47:58.803 18829-18829/app.myapplication V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@11983e3
06-08 14:47:58.803 18829-18829/app.myapplication V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@29e81e0
06-08 14:47:58.835 18829-18829/app.myapplication D/SQLiteHandler: Fetching user from Sqlite: {}
06-08 14:47:58.889 18829-18971/app.myapplication D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
06-08 14:47:58.910 18829-18829/app.myapplication D/ActivityThreadInjector: clearCachedDrawables.
06-08 14:47:58.996 18829-18971/app.myapplication I/Adreno: QUALCOMM build                   : a7823f5, I59a6815413
                                                                               Build Date                       : 09/23/16
                                                                               OpenGL ES Shader Compiler Version: XE031.07.00.00
                                                                               Local Branch                     : mybranch22028469
                                                                               Remote Branch                    : quic/LA.BR.1.3.3_rb2.26
                                                                               Remote Branch                    : NONE
                                                                               Reconstruct Branch               : NOTHING
06-08 14:47:59.030 18829-18971/app.myapplication I/OpenGLRenderer: Initialized EGL, version 1.4
06-08 14:47:59.072 18829-18971/app.myapplication E/HAL: hw_get_module_by_class: module name gralloc
06-08 14:47:59.072 18829-18971/app.myapplication E/HAL: hw_get_module_by_class: module name gralloc
06-08 14:48:02.796 18829-18829/app.myapplication W/PathParser: Points are too far apart 4.000000596046461
06-08 14:48:03.830 18829-18829/app.myapplication W/PathParser: Points are too far apart 4.000000596046461

如果您需要更多代码，请告诉我们。

Answer 1

首先，永远不要这样做......在活动上调用new

LoginActivity Log = new LoginActivity()

其次，你确定你在使用Fragments吗？

这是一项活动

LoginActivity extends Activity

您只是将Fragment布局放入Activity

 setContentView(R.layout.login_fragment);

你似乎从未真正使用过LoginFragment类

我认为您加载了错误的类，因为如果您在此活动代码上使用了startActivity，那么您的按钮就可以正常工作

Answer 2

您编写编辑您的片段类

public class LoginFragment extends Fragment {
  public  Button btnLogin;
    @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.login_fragment,container,false):

btnLogin.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                String email = inputEmail.getText().toString().trim();
                String password = inputPassword.getText().toString().trim();

                // Check for empty data in the form
                if (!email.isEmpty() && !password.isEmpty()) {
                    // login user
                    checkLogin(email, password);
                } else {
                    // Prompt user to enter credentials
                    Toast.makeText(getApplicationContext(),
                            "Please enter the credentials!", Toast.LENGTH_LONG)
                            .show();
                }
            }

        });

        // Link to Register Screen
        btnLinkToRegister.setOnClickListener(new OnClickListener() {

            public void onClick(View view) {
                Intent i = new Intent(getApplicationContext(),
                        RegisterActivity.class);
                startActivity(i);
                finish();
            }
        });
            return view;
        }
    }

写这种方式在登录片段.xml

中帮助太多了

setOnClickListener（）不起作用

2 个答案: