java - 使用 mySQL 和 php 强制关闭 android 中的注册 Activity

Question

我正在尝试制作一个需要用户登录并且用户可以在那里注册的应用程序。我正在使用 mySQL。我的 table 没问题。我的代码没有给出任何编译时错误，但它给出了很多运行时错误，并且每当单击执行 HttpPost 的创建按钮时强制关闭。不知道该怎么办。我正在发布我的代码。请帮助解决代码和错误。

package com.example.learning2;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.ToggleButton;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

final Button crtButton = (Button) findViewById(R.id.button1);

crtButton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), newUser.class);
startActivity(i);
}
});




}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

//newUser.java

package com.example.learning2;

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.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class newUser extends Activity{

JSONParser jsonParser = new JSONParser();

EditText idForm;
EditText nameForm;
EditText passForm;

final String url_of_post = "http://localhost/Cab_service/create_user.php";
final String TAG_SUCCESS ="success";

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

idForm = (EditText) findViewById(R.id.userId);
nameForm = (EditText) findViewById(R.id.userName);
passForm = (EditText) findViewById(R.id.userPass);

final Button createButton = (Button) findViewById(R.id.button2);


createButton.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
new createNewUser().execute();
}
});

}

class createNewUser extends AsyncTask<String, String, String>{

protected String doInBackground(String... args){
String pid = idForm.getText().toString();
String user_name = nameForm.getText().toString();
String password = passForm.getText().toString();

List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("$pid", pid));
params.add(new BasicNameValuePair("$user_name", user_name));
params.add(new BasicNameValuePair("$password", password));

JSONObject json = jsonParser.makeHttpRequest(url_of_post, "POST", params);

Log.d("Create Response", json.toString());

try{
int success = json.getInt(TAG_SUCCESS);
if(success==1)
{
Toast.makeText(getBaseContext(), "Successful", Toast.LENGTH_SHORT).show();
finish();
}
else
Toast.makeText(getBaseContext(), "UNSuccessful", Toast.LENGTH_SHORT).show();


}catch(JSONException e){ e.printStackTrace();}
return null;
}
}

}

//Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.learning2"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.learning2.MainActivity"
android:label="@string/app_name" >
<intent-filter>
         <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <activity 
        android:name=".newUser"
        android:label="Create New User">

    </activity>
</application>
<uses-permission android:name="android.permission.INTERNET" />


</manifest>

//Logcat

12-25 03:48:42.014: W/KeyCharacterMap(432): No keyboard for id 0
12-25 03:48:42.014: W/KeyCharacterMap(432): Using default keymap: 

/system/usr/keychars/qwerty.kcm.bin
12-25 03:48:51.835: W/System.err(432): org.apache.http.conn.HttpHostConnectException: Connection to http://localhost refused`
12-25 03:48:51.835: W/System.err(432):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:178)
12-25 03:48:51.845: W/System.err(432):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
12-25 03:48:51.845: W/System.err(432):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
12-25 03:48:51.845: W/System.err(432):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
12-25 03:48:51.845: W/System.err(432):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
12-25 03:48:51.845: W/System.err(432):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
12-25 03:48:51.855: W/System.err(432):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
12-25 03:48:51.855: W/System.err(432):  at com.example.learning2.JSONParser.makeHttpRequest(JSONParser.java:47)
12-25 03:48:51.855: W/System.err(432):  at com.example.learning2.newUser$createNewUser.doInBackground(newUser.java:67)
12-25 03:48:51.855: W/System.err(432):  at com.example.learning2.newUser$createNewUser.doInBackground(newUser.java:1)
12-25 03:48:51.855: W/System.err(432):  at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-25 03:48:51.855: W/System.err(432):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
12-25 03:48:51.865: W/System.err(432):  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-25 03:48:51.865: W/System.err(432):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-25 03:48:51.865: W/System.err(432):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-25 03:48:51.865: W/System.err(432):  at java.lang.Thread.run(Thread.java:1019)
12-25 03:48:51.865: W/System.err(432): Caused by: java.net.ConnectException: /127.0.0.1:80 - Connection refused
12-25 03:48:51.875: W/System.err(432):  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)
12-25 03:48:51.875: W/System.err(432):  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
12-25 03:48:51.875: W/System.err(432):  at java.net.Socket.connect(Socket.java:983)
12-25 03:48:51.875: W/System.err(432):  at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
12-25 03:48:51.885: W/System.err(432):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
12-25 03:48:51.885: W/System.err(432):  ... 15 more
12-25 03:48:51.895: E/Buffer Error(432): Error converting result java.lang.NullPointerException
12-25 03:48:51.895: E/JSON Parser(432): Error parsing data org.json.JSONException: End of input at character 0 of 
12-25 03:48:51.905: W/dalvikvm(432): threadid=9: thread exiting with uncaught exception (group=0x40015560)
12-25 03:48:51.915: E/AndroidRuntime(432): FATAL EXCEPTION: AsyncTask #1
12-25 03:48:51.915: E/AndroidRuntime(432): java.lang.RuntimeException: An error occured while executing doInBackground()
12-25 03:48:51.915: E/AndroidRuntime(432):  at android.os.AsyncTask$3.done(AsyncTask.java:200)
12-25 03:48:51.915: E/AndroidRuntime(432):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
12-25 03:48:51.915: E/AndroidRuntime(432):  at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
12-25 03:48:51.915: E/AndroidRuntime(432):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
12-25 03:48:51.915: E/AndroidRuntime(432):  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-25 03:48:51.915: E/AndroidRuntime(432):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-25 03:48:51.915: E/AndroidRuntime(432):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-25 03:48:51.915: E/AndroidRuntime(432):  at java.lang.Thread.run(Thread.java:1019)
12-25 03:48:51.915: E/AndroidRuntime(432): Caused by: java.lang.NullPointerException
12-25 03:48:51.915: E/AndroidRuntime(432):  at com.example.learning2.newUser$createNewUser.doInBackground(newUser.java:69)
12-25 03:48:51.915: E/AndroidRuntime(432):  at com.example.learning2.newUser$createNewUser.doInBackground(newUser.java:1)
12-25 03:48:51.915: E/AndroidRuntime(432):  at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-25 03:48:51.915: E/AndroidRuntime(432):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
12-25 03:48:51.915: E/AndroidRuntime(432):  ... 4 more
12-25 03:48:54.045: I/Process(432): Sending signal. PID: 432 SIG: 9

顺便说一句，我是新的 Android 开发人员，对此没有太多想法。

谢谢!

我认为问题出在 newUser 类中。你们可以检查一下该类是否有错误吗？

Answer 1

问题解决了!!

我在应用程序中使用了“localhost”或“127.0.0.1”，但是当我在模拟器中运行它时，它使用“localhost”作为模拟器本地主机而不是我的电脑。将地址更改为我的电脑 IP 后，连接正常。

不过还是谢谢你。