我是android新手，我还在学习。我正在为我的大学门户网站制作一个关于出勤的Android应用程序..我已经学习了与PHP数据库访问相关的代码并且已经制作了我自己的代码，但不幸的是......当我运行我的项目时......模拟器关闭了说它不起作用，即应用程序已关闭。
我想要它做的就是检查登录页面并说明登录是否成功。 这是主要代码
package com.vasan.msritstudentservice;
import java.util.*;
import org.apache.http.NameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MSRITMainActivity extends Activity {
Button login;
EditText SID,SPswd;
ProgressDialog PDial = null;
JSONParser JP = new JSONParser();
private static String url_login = "http://10.0.2.2/MSRIT Student Info Handles/MSRIT_login.php";
private static final String TAG_LOGIN_SUCCESS = "success";
private static final String TAG_LOGIN_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.msrit_main);
SID = (EditText) findViewById(R.id.IDEditText);
SPswd = (EditText) findViewById(R.id.PasswordEditText);
login = (Button) findViewById(R.id.LoginButton);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PDial = ProgressDialog.show(getApplicationContext(), "", "Validating user.Please wait...", true);
new Thread(new Runnable()
{
public void run()
{
login();
}
}).start();
}
});
}
void login()
{
List<NameValuePair> params = new ArrayList<NameValuePair>();
JSONObject json = JP.makeHttpRequest(url_login, "GET", params);
try
{
int success = json.getInt(TAG_LOGIN_SUCCESS);
runOnUiThread(new Runnable()
{
public void run()
{
PDial.dismiss();
}
});
if (success == 1)
{
runOnUiThread(new Runnable()
{
public void run()
{
Toast.makeText(getApplicationContext(),"Login Success!!", Toast.LENGTH_SHORT).show();
}
});
}
else
{
showAlert();
}
}
catch(JSONException E)
{
PDial.dismiss();
E.printStackTrace();
}
}
void showAlert()
{
MSRITMainActivity.this.runOnUiThread(new Runnable()
{
public void run()
{
AlertDialog.Builder builder = new AlertDialog.Builder(MSRITMainActivity.this);
builder.setTitle("Login Error.");
builder.setMessage("User not Found.")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
}
});
AlertDialog alert = builder.create();
alert.show();
}
});
}
}
这是json解析代码
package com.vasan.msritstudentservice;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method.equals.("POST")){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method.equals("GET")){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
用作布局的xml文件：msrit_main.xml
<RelativeLayout 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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@drawable/app_image"
tools:context=".MSRITMainActivity" >
<TextView
android:id="@+id/WelcomeTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="24dp"
android:text="Welcome to MSRIT Student Service"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/RequestTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/WelcomeTextView"
android:layout_centerHorizontal="true"
android:layout_marginTop="16dp"
android:text="Please enter login details"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/IDTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/RequestTextView"
android:layout_centerHorizontal="true"
android:layout_marginTop="22dp"
android:text="Student ID"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/IDEditText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/WelcomeTextView"
android:layout_below="@+id/IDTextView"
android:layout_marginTop="14dp"
android:ems="10"
android:singleLine="true"
android:text="STUDENT ID" />
<TextView
android:id="@+id/PasswordTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Student Password"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/PasswordEditText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/WelcomeTextView"
android:layout_below="@+id/PasswordTextView"
android:layout_marginTop="20dp"
android:ems="10"
android:singleLine="true"
android:text="STUDENT PASSWORD" >
<requestFocus />
</EditText>
<Button
android:id="@+id/LoginButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/PasswordEditText"
android:layout_centerHorizontal="true"
android:layout_marginTop="16dp"
android:text="LOGIN" />
</RelativeLayout>
这是程序中使用的php代码
<?php
$response = array();
require_once __DIR__ . '/MSRIT_db_connect.php';
$db = new DB_CONNECT();
if (isset($_GET["studid"]) && $_GET["studpwd"])
{
$studid = $_GET['studid'];
$studpwd = $_GET['studpwd'];
$result = mysql_query("SELECT * FROM studentdetails WHERE studid = $attid AND studpwd = $studpwd");
if (!empty($result))
{
if (mysql_num_rows($result) > 0)
{
$response["success"] = 1;
$response["message"] = "Login Successful";
echo json_encode($response);
}
else
{
$response["success"] = 0;
$response["message"] = "Login unsuccessful, No Record Found, Please enter the correct details";
echo json_encode($response);
}
}
else
{
$response["success"] = 0;
$response["message"] = "Login unsuccessful, No Record Found, Please enter the correct details";
echo json_encode($response);
}
}
else
{
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
echo json_encode($response);
}
?>
我的清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.vasan.msritstudentservice"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.vasan.msritstudentservice.MSRITMainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
我真的想知道我的代码有什么问题asap..thanks
03-17 06:21:02.672: D/dalvikvm(823): GC_CONCURRENT freed 92K, 8% free 2681K/2904K, paused 19ms+3ms, total 70ms
03-17 06:21:02.672: D/dalvikvm(823): WAIT_FOR_CONCURRENT_GC blocked 33ms
03-17 06:21:02.924: D/dalvikvm(823): GC_CONCURRENT freed 314K, 15% free 2769K/3224K, paused 27ms+19ms, total 124ms
03-17 06:21:03.512: D/gralloc_goldfish(823): Emulator without GPU emulation detected.
03-17 06:21:42.571: D/dalvikvm(823): GC_CONCURRENT freed 206K, 11% free 3012K/3352K, paused 72ms+5ms, total 121ms
03-17 06:21:42.571: D/dalvikvm(823): WAIT_FOR_CONCURRENT_GC blocked 21ms
03-17 06:21:42.581: I/dalvikvm-heap(823): Grow heap (frag case) to 3.672MB for 635812-byte allocation
03-17 06:21:42.701: D/dalvikvm(823): GC_FOR_ALLOC freed 57K, 11% free 3576K/3976K, paused 116ms, total 117ms
03-17 06:21:42.821: D/dalvikvm(823): GC_FOR_ALLOC freed 12K, 11% free 3564K/3976K, paused 101ms, total 103ms
03-17 06:21:42.821: I/dalvikvm-heap(823): Grow heap (frag case) to 4.082MB for 500416-byte allocation
03-17 06:21:42.951: D/dalvikvm(823): GC_FOR_ALLOC freed <1K, 10% free 4053K/4468K, paused 119ms, total 119ms
03-17 06:21:43.101: D/dalvikvm(823): GC_CONCURRENT freed 1K, 9% free 4072K/4468K, paused 10ms+87ms, total 150ms
03-17 06:21:43.141: D/AndroidRuntime(823): Shutting down VM
03-17 06:21:43.151: W/dalvikvm(823): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
03-17 06:21:43.171: E/AndroidRuntime(823): FATAL EXCEPTION: main
03-17 06:21:43.171: E/AndroidRuntime(823): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
03-17 06:21:43.171: E/AndroidRuntime(823): at android.view.ViewRootImpl.setView(ViewRootImpl.java:571)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:246)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.app.Dialog.show(Dialog.java:281)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.app.ProgressDialog.show(ProgressDialog.java:116)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.app.ProgressDialog.show(ProgressDialog.java:99)
03-17 06:21:43.171: E/AndroidRuntime(823): at com.vasan.msritstudentservice.MSRITMainActivity$1.onClick(MSRITMainActivity.java:45)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.view.View.performClick(View.java:4204)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.view.View$PerformClick.run(View.java:17355)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.os.Handler.handleCallback(Handler.java:725)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.os.Handler.dispatchMessage(Handler.java:92)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.os.Looper.loop(Looper.java:137)
03-17 06:21:43.171: E/AndroidRuntime(823): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-17 06:21:43.171: E/AndroidRuntime(823): at java.lang.reflect.Method.invokeNative(Native Method)
03-17 06:21:43.171: E/AndroidRuntime(823): at java.lang.reflect.Method.invoke(Method.java:511)
03-17 06:21:43.171: E/AndroidRuntime(823): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-17 06:21:43.171: E/AndroidRuntime(823): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-17 06:21:43.171: E/AndroidRuntime(823): at dalvik.system.NativeStart.main(Native Method)
03-17 06:21:51.902: I/Process(823): Sending signal. PID: 823 SIG: 9