我的申请需要帮助，这是学校项目。在该应用程序中，我想要登录和注册，但是每当我按下登录和注册新帐户按钮时，整个应用程序就会崩溃。我使用 wamp 2.5 作为服务器。
登录 Activity .java
package com.yang.hotelreceptiondemo;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.yang.hotelreceptiondemo.library.UserFunctions;
public class LoginActivity extends Activity {
public Button btnLogin;
Button btnLinkToRegister;
EditText inputEmail;
EditText inputPassword;
public TextView loginErrorMsg;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
// Importing all assets like buttons, text fields
inputEmail = (EditText) findViewById(R.id.loginEmail);
inputPassword = (EditText) findViewById(R.id.loginPassword);
btnLogin = (Button) findViewById(R.id.btnLogin);
btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);
loginErrorMsg = (TextView) findViewById(R.id.login_error);
// Login button Click Event
btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String email = inputEmail.getText().toString();
String password = inputPassword.getText().toString();
UserFunctions userFunction = new UserFunctions();
Log.d("Button", "Login");
new LoginAsyncTask(LoginActivity.this, userFunction).execute(
email, password);
btnLogin.setEnabled(false);
}
});
// Link to Register Screen
btnLinkToRegister.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(),
RegisterActivity.class);
startActivity(i);
finish();
}
});
}
}
LoginAsyncTask.java
package com.yang.hotelreceptiondemo;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Intent;
import android.os.AsyncTask;
import com.yang.hotelreceptiondemo.library.DatabaseHandler;
import com.yang.hotelreceptiondemo.library.UserFunctions;
public class LoginAsyncTask extends AsyncTask<String, Void, JSONObject> {
private UserFunctions userFunction;
private LoginActivity activity;
// 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";
public LoginAsyncTask(LoginActivity activity, UserFunctions userFunction) {
this.activity = activity;
this.userFunction = userFunction;
}
@Override
protected JSONObject doInBackground(String... datas) {
return userFunction.loginUser(datas[0], datas[1]);
}
@Override
protected void onPostExecute(JSONObject json) {
activity.btnLogin.setEnabled(true);
// check for login response
try {
if (json.getString(KEY_SUCCESS) != null) {
activity.loginErrorMsg.setText("");
String res = json.getString(KEY_SUCCESS);
if (Integer.parseInt(res) == 1) {
// user successfully logged in
// Store user details in SQLite Database
DatabaseHandler db = new DatabaseHandler(
activity.getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
// Clear all previous data in database
userFunction.logoutUser(activity.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(
activity.getApplicationContext(),
DashboardActivity.class);
// Close all views before launching Dashboard
dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
activity.startActivity(dashboard);
// Close Login Screen
activity.finish();
} else {
// Error in login
activity.loginErrorMsg
.setText("Incorrect username/password");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
日志.txt
05-25 23:19:48.600: E/JSON(3414): <br />
05-25 23:19:48.600: E/JSON(3414): <font size='1'><table class='xdebug-error xe-deprecated' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
05-25 23:19:48.600: E/JSON(3414): <tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in C:\wamp\www\android_login_api\include\DB_Connect.php on line <i>18</i></th></tr>
05-25 23:19:48.600: E/JSON(3414): <tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
05-25 23:19:48.600: E/JSON(3414): <tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
05-25 23:19:48.600: E/JSON(3414): <tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0006</td><td bgcolor='#eeeeec' align='right'>252360</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp\www\android_login_api\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>
05-25 23:19:48.600: E/JSON(3414): <tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.0013</td><td bgcolor='#eeeeec' align='right'>276160</td><td bgcolor='#eeeeec'>DB_Functions->__construct( )</td><td title='C:\wamp\www\android_login_api\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>19</td></tr>
05-25 23:19:48.600: E/JSON(3414): <tr><td bgcolor='#eeeeec' align='center'>3</td><td bgcolor='#eeeeec' align='center'>0.0019</td><td bgcolor='#eeeeec' align='right'>282296</td><td bgcolor='#eeeeec'>DB_Connect->connect( )</td><td title='C:\wamp\www\android_login_api\include\DB_Functions.php' bgcolor='#eeeeec'>..\DB_Functions.php<b>:</b>13</td></tr>
05-25 23:19:48.600: E/JSON(3414): <tr><td bgcolor='#eeeeec' align='center'>4</td><td bgcolor='#eeeeec' align='center'>0.0027</td><td bgcolor='#eeeeec' align='right'>283136</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mysql-connect' target='_new'>mysql_connect</a>
05-25 23:19:48.600: E/JSON(3414): ( )</td><td title='C:\wamp\www\android_login_api\include\DB_Connect.php' bgcolor='#eeeeec'>..\DB_Connect.php<b>:</b>18</td></tr>
05-25 23:19:48.600: E/JSON(3414): </table></font>
05-25 23:19:48.600: E/JSON(3414): {"tag":"login","success":1,"error":0,"uid":"5381f93b6fabb8.91945568","user":{"name":"testing","email":"testing@hotmail.com","created_at":"2014-05-25 22:07:55","updated_at":null}}
05-25 23:19:48.610: E/JSON Parser(3414): Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
05-25 23:19:48.610: D/AndroidRuntime(3414): Shutting down VM
05-25 23:19:48.610: W/dalvikvm(3414): threadid=1: thread exiting with uncaught exception (group=0xb2c07180)
05-25 23:19:48.610: I/Process(3414): Sending signal. PID: 3414 SIG: 9
05-25 23:19:48.610: D/AndroidRuntime(3414): procName from cmdline: com.yang.hotelreceptiondemo
05-25 23:19:48.610: E/AndroidRuntime(3414): in writeCrashedAppName, pkgName :com.yang.hotelreceptiondemo
05-25 23:19:48.610: D/AndroidRuntime(3414): file written successfully with content: com.yang.hotelreceptiondemo StringBuffer : ;com.yang.hotelreceptiondemo
05-25 23:19:48.610: E/AndroidRuntime(3414): FATAL EXCEPTION: main
05-25 23:19:48.610: E/AndroidRuntime(3414): java.lang.NullPointerException
05-25 23:19:48.610: E/AndroidRuntime(3414): at com.yang.hotelreceptiondemo.LoginAsyncTask.onPostExecute(LoginAsyncTask.java:41)
05-25 23:19:48.610: E/AndroidRuntime(3414): at com.yang.hotelreceptiondemo.LoginAsyncTask.onPostExecute(LoginAsyncTask.java:1)
05-25 23:19:48.610: E/AndroidRuntime(3414): at android.os.AsyncTask.finish(AsyncTask.java:602)
05-25 23:19:48.610: E/AndroidRuntime(3414): at android.os.AsyncTask.access$600(AsyncTask.java:156)
05-25 23:19:48.610: E/AndroidRuntime(3414): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
05-25 23:19:48.610: E/AndroidRuntime(3414): at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 23:19:48.610: E/AndroidRuntime(3414): at android.os.Looper.loop(Looper.java:137)
05-25 23:19:48.610: E/AndroidRuntime(3414): at android.app.ActivityThread.main(ActivityThread.java:4424)
05-25 23:19:48.610: E/AndroidRuntime(3414): at java.lang.reflect.Method.invokeNative(Native Method)
05-25 23:19:48.610: E/AndroidRuntime(3414): at java.lang.reflect.Method.invoke(Method.java:511)
05-25 23:19:48.610: E/AndroidRuntime(3414): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
05-25 23:19:48.610: E/AndroidRuntime(3414): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:592)
05-25 23:19:48.610: E/AndroidRuntime(3414): at dalvik.system.NativeStart.main(Native Method)
最佳答案
由于有关已弃用的 mysql_connect 的 php 警告，您的 json 结果似乎已损坏。 在 php.ini 中，您可以通过排除已弃用的警告来消除这些警告:
error_reporting = E_ALL ^ E_DEPRECATED
重新启动您的网络服务器并重试。
关于java - Android 应用程序在登录和注册时崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23856838/