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Androidアプリのログインおよび登録画面と、登録またはログインボタンがクリックされたときに関連付けられたアクティビティがあります。保存中にエラーは発生しません。しかし、実行すると、画面がエミュレーターにロードされ、データを入力できるようになりますが、[登録] ボタンまたは [ログイン] ボタンをクリックするとすぐに、「アプリケーションが予期せず停止しました。もう一度やり直してください」というエラーが表示されます。

LogCat で表示されるエラーは次のとおりです。

03-01 13:01:49.649: W/dalvikvm(583): threadid=1: thread exiting with uncaught exception (group=0x40015560)
03-01 13:01:49.669: E/AndroidRuntime(583): FATAL EXCEPTION: main
03-01 13:01:49.669: E/AndroidRuntime(583): java.lang.NullPointerException
03-01 13:01:49.669: E/AndroidRuntime(583): at com.example.attendance2.RegisterActivity$1.onClick(RegisterActivity.java:59)
03-01 13:01:49.669: E/AndroidRuntime(583):     at android.view.View.performClick(View.java:2485)
03-01 13:01:49.669: E/AndroidRuntime(583):     at android.view.View$PerformClick.run(View.java:9080)
03-01 13:01:49.669: E/AndroidRuntime(583):     at android.os.Handler.handleCallback(Handler.java:587)
03-01 13:01:49.669: E/AndroidRuntime(583):     at android.os.Handler.dispatchMessage(Handler.java:92)
03-01 13:01:49.669: E/AndroidRuntime(583):     at android.os.Looper.loop(Looper.java:123)
03-01 13:01:49.669: E/AndroidRuntime(583):     at android.app.ActivityThread.main(ActivityThread.java:3683)
03-01 13:01:49.669: E/AndroidRuntime(583):     at java.lang.reflect.Method.invokeNative(Native Method)
03-01 13:01:49.669: E/AndroidRuntime(583):     at java.lang.reflect.Method.invoke(Method.java:507)
03-01 13:01:49.669: E/AndroidRuntime(583):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-01 13:01:49.669: E/AndroidRuntime(583):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-01 13:01:49.669: E/AndroidRuntime(583):     at dalvik.system.NativeStart.main(Native Method)
03-01 13:01:56.080: I/Process(583): Sending signal. PID: 583 SIG: 9

RegisterActivity.java を確認しましたが、すべて問題ないようです... RegisterActivity.java と UserFunctions.java も追加しました。ログインに LoginActivity.java を試すと、同じ種類のエラーが発生します。

RegisterActivity.java

package com.example.attendance2;

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

import library.DatabaseHandler;
import library.UserFunctions;

import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class RegisterActivity extends Activity {
Button btnRegister;
Button btnLinkToLogin;
EditText inputFullName;
EditText inputEmail;
EditText inputPassword;
TextView registerErrorMsg;

// JSON Response node names
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";

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

    // Importing all assets like buttons, text fields
    inputFullName = (EditText) findViewById(R.id.registerName);
    inputEmail = (EditText) findViewById(R.id.registerEmail);
    inputPassword = (EditText) findViewById(R.id.registerPassword);
    btnRegister = (Button) findViewById(R.id.btnRegister);
    btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen);
    registerErrorMsg = (TextView) findViewById(R.id.register_error);

    // Register Button Click event
    btnRegister.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            String name = inputFullName.getText().toString();
            String email = inputEmail.getText().toString();
            String password = inputPassword.getText().toString();
            UserFunctions userFunction = new UserFunctions();
            JSONObject json = userFunction.registerUser(name, email, password);

            // check for login response
            try {
                if (json.getString(KEY_SUCCESS) != null) {
                    registerErrorMsg.setText("");
                    String res = json.getString(KEY_SUCCESS);
                    if(Integer.parseInt(res) == 1){
                        // user successfully registered
                        // Store user details in SQLite Database
                        DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                        JSONObject json_user = json.getJSONObject("user");

                        // Clear all previous data in database
                        userFunction.logoutUser(getApplicationContext());
                        db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));
                        // Launch Dashboard Screen
                        Intent dashboard = new Intent(getApplicationContext(),   DashboardActivity.class);
                        // Close all views before launching Dashboard
                        dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(dashboard);
                        // Close Registration Screen
                        finish();
                    }else{
                        // Error in registration
                        registerErrorMsg.setText("Error occured in registration");
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    });

    // Link to Login Screen
    btnLinkToLogin.setOnClickListener(new View.OnClickListener() {

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

UserFunctions.java

package library;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.jsn.JSONObject;

import android.content.Context;

public class UserFunctions {

private JSONParser jsonParser;

// Testing in localhost using wamp or xampp
// use http://10.0.2.2/ to connect to your localhost ie http://localhost/
private static String loginURL = "http://10.0.2.2:82/android_api/";
private static String registerURL = "http://10.0.2.2:82/android_api/";

private static String login_tag = "login";
private static String register_tag = "register";

// constructor
public UserFunctions(){
    jsonParser = new JSONParser();
}

/**
 * function make Login Request
 * @param email
 * @param password
 * */
public JSONObject loginUser(String email, String password){
    // Building Parameters
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("tag", login_tag));
    params.add(new BasicNameValuePair("email", email));
    params.add(new BasicNameValuePair("password", password));
    JSONObject json = jsonParser.getJSONFromUrl(loginURL, params);
    // return json
    // Log.e("JSON", json.toString());
    return json;
}

/**
 * function make Login Request
 * @param name
 * @param email
 * @param password
 * */
public JSONObject registerUser(String name, String email, String password){
    // Building Parameters
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("tag", register_tag));
    params.add(new BasicNameValuePair("name", name));
    params.add(new BasicNameValuePair("email", email));
    params.add(new BasicNameValuePair("password", password));

    // getting JSON Object
    JSONObject json = jsonParser.getJSONFromUrl(registerURL, params);
    // return json
    return json;
}

/**
 * Function get Login status
 * */
public boolean isUserLoggedIn(Context context){
    DatabaseHandler db = new DatabaseHandler(context);
    int count = db.getRowCount();
    if(count > 0){
        // user logged in
        return true;
    }
    return false;
}

/**
 * Function to logout user
 * Reset Database
 * */
public boolean logoutUser(Context context){
    DatabaseHandler db = new DatabaseHandler(context);
    db.resetTables();
    return true;
}

}
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1 に答える 1

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registerErrorMsg がnullのように見えます-たとえば、テキストビューがレイアウトに見つかりません。使用する ID (R.id.register_error) が別の要素で宣言されている可能性があります。

于 2013-03-01T18:26:29.963 に答える