我有登录活动。这个问题让我疯狂了两天多。当我插入正确的用户名和密码时，登录成功。但是当我插入错误的用户名或密码时，应用程序会冻结。我认为我有正确的对话解雇，这是根据我在stackoverflow上搜索大多数情况下的主要漏洞 我的登录活动
package com.example.tranfer;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
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;
public class Login extends Activity implements OnClickListener {
private EditText user, pass;
private Button mSubmit, mRegister;
private String username, password;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// php login script location:
// localhost :
// testing on your device
// put your local ip instead, on windows, run CMD > ipconfig
// or in mac's terminal type ifconfig and look for the ip under en0 or en1
// private static final String LOGIN_URL =
// "http://xxx.xxx.x.x:1234/webservice/login.php";
// testing on Emulator:private static final String LOGIN_URL = "http://******";
// testing from a real server:
// private static final String LOGIN_URL =
// "http://www.yourdomain.com/webservice/login.php";
// JSON element ids from response of php script:
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
// setup input fields
user = (EditText) findViewById(R.id.editusername);
pass = (EditText) findViewById(R.id.editpassword);
// setup buttons
mSubmit = (Button) findViewById(R.id.signin);
mRegister = (Button) findViewById(R.id.register);
// register listeners
mSubmit.setOnClickListener(this);
mRegister.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.signin:
new AttemptLogin().execute();
break;
case R.id.register:
Intent i = new Intent(this, RegistrationForm.class);
startActivity(i);
break;
default:
break;
}
}
class AttemptLogin extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
boolean failure = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Login.this);
pDialog.setMessage("Προσπάθεια σύνδεσης...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
username = user.getText().toString();
password = pass.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
Log.d("request!", "starting");
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(LOGIN_URL, "POST",
params);
// check your log for json response
Log.d("Login attempt", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Login Successful!", json.toString());
Intent i = new Intent(Login.this, MainActivity1.class);
finish();
startActivity(i);
return json.getString(TAG_MESSAGE);
} else {
Log.d("Login Failure!", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
if (file_url != null) {
Toast.makeText(Login.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}
我的php文件
<?php
//load and connect to MySQL database stuff
require("config.inc.php");
if (!empty($_POST)) {
//gets user's info based off of a username.
$query = "
SELECT
id,
username,
password
FROM users
WHERE
username = :username
";
$query_params = array(
':username' => $_POST['username']
);
try {
$stmt = $db->prepare($query);
$result = $stmt->execute($query_params);
}
catch (PDOException $ex) {
// For testing, you could use a die and message.
//die("Failed to run query: " . $ex->getMessage());
//or just use this use this one to product JSON data:
$response["success"] = 0;
$response["message"] = "Database Error1. Please Try Again!";
die(json_encode($response));
}
//This will be the variable to determine whether or not the user's information is correct.
//we initialize it as false.
$validated_info = false;
//fetching all the rows from the query
$row = $stmt->fetch();
if ($row) {
//if we encrypted the password, we would unencrypt it here, but in our case we just
//compare the two passwords
if ($_POST['password'] === $row['password']) {
$login_ok = true;
}
}
if ($login_ok) {
$response["success"] = 1;
$response["message"] = "Login successful!";
die(json_encode($response));
} else {
$response["success"] = 0;
$response["message"] = "Invalid Credentials!";
die(json_encode($response));
}
} else {
?>
<h1>Login</h1>
<form action="login.php" method="post">
Username:<br />
<input type="text" name="username" placeholder="username" />
<br /><br />
Password:<br />
<input type="password" name="password" placeholder="password" value="" />
<br /><br />
<input type="submit" value="Login" />
</form>
<a href="register.php">Register</a>
<?php
}
?>
logcat的
05-29 22:01:23.388: E/WindowManager(24822): Activity com.example.tranfer.Login has leaked window com.android.internal.policy.impl.PhoneWindow $DecorView@4272a7f0 that was originally added here
05-29 22:01:23.388: E/WindowManager(24822): android.view.WindowLeaked: Activity com.example.tranfer.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4272a7f0 that was originally added here
05-29 22:01:23.388: E/WindowManager(24822): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:415)
05-29 22:01:23.388: E/WindowManager(24822): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:322)
05-29 22:01:23.388: E/WindowManager(24822): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:234)
05-29 22:01:23.388: E/WindowManager(24822): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:153)
05-29 22:01:23.388: E/WindowManager(24822): at android.view.Window$LocalWindowManager.addView(Window.java:559)
05-29 22:01:23.388: E/WindowManager(24822): at android.app.Dialog.show(Dialog.java:301)
05-29 22:01:23.388: E/WindowManager(24822): at com.example.tranfer.Login$AttemptLogin.onPreExecute(Login.java:106)
05-29 22:01:23.388: E/WindowManager(24822): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
05-29 22:01:23.388: E/WindowManager(24822): at android.os.AsyncTask.execute(AsyncTask.java:534)
05-29 22:01:23.388: E/WindowManager(24822): at com.example.tranfer.Login.onClick(Login.java:80)
05-29 22:01:23.388: E/WindowManager(24822): at android.view.View.performClick(View.java:4262)
05-29 22:01:23.388: E/WindowManager(24822): at android.view.View$PerformClick.run(View.java:17421)
05-29 22:01:23.388: E/WindowManager(24822): at android.os.Handler.handleCallback(Handler.java:615)
05-29 22:01:23.388: E/WindowManager(24822): at android.os.Handler.dispatchMessage(Handler.java:92)
05-29 22:01:23.388: E/WindowManager(24822): at android.os.Looper.loop(Looper.java:137)
05-29 22:01:23.388: E/WindowManager(24822): at android.app.ActivityThread.main(ActivityThread.java:4944)
05-29 22:01:23.388: E/WindowManager(24822): at java.lang.reflect.Method.invokeNative(Native Method)
05-29 22:01:23.388: E/WindowManager(24822): at java.lang.reflect.Method.invoke(Method.java:511)
05-29 22:01:23.388: E/WindowManager(24822): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
05-29 22:01:23.388: E/WindowManager(24822): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
05-29 22:01:23.388: E/WindowManager(24822): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
我认为这是因为您的ProgressDialog在进入下一个活动之前没有关闭。
变化：
if (success == 1) {
Log.d("Login Successful!", json.toString());
Intent i = new Intent(Login.this, MainActivity1.class);
finish();
startActivity(i);
return json.getString(TAG_MESSAGE);
}
要：
if (success == 1) {
pDialog.dismiss();
Log.d("Login Successful!", json.toString());
Intent i = new Intent(Login.this, MainActivity1.class);
finish();
startActivity(i);
return json.getString(TAG_MESSAGE);
}
如果pDialog.dismss();方法不为空，您还应该确保onDestroy()。{/ p>
答案 1 :(得分：0)
首先将以下两行从doInBackground移至onPreExecute ...
username = user.getText().toString();
password = pass.getText().toString();
...你不应该试图从doInBackground访问任何UI元素，因为它在一个单独的线程上运行到主（UI）线程。
其次，将启动MainActivity1的代码移至您的onPostExecute方法。在你关闭对话框后把它放好。