【发布时间】：2014-04-30 14:41:55
【问题描述】：
我正在尝试连接我的 android 应用程序，该应用程序的登录页面使用 php 连接到数据库。它正在连接到数据库。但它不是从表中检索所有列。相反，仅获取两个列。以下是代码
package com.example.hell;
public class MainActivity extends Activity {
Button btn;
EditText ed;
EditText ed1;
@Override
protected void onCreate(Bundle savedInstanceState) {
final
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ed=(EditText)findViewById(R.id.editText1);
ed1= (EditText)findViewById(R.id.editText2);
btn=(Button)findViewById(R.id.button1);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String result = null;
InputStream is = null;
EditText editText = (EditText)findViewById(R.id.editText1);
String v1 = editText.getText().toString();
EditText editText1 = (EditText)findViewById(R.id.editText2);
String v2 = editText1.getText().toString();
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("id",v1));
nameValuePairs.add(new BasicNameValuePair("password",v2));
StrictMode.setThreadPolicy(policy);
try{
HttpClient httpclient=new DefaultHttpClient();
HttpPost httppost=new HttpPost("http://10.0.2.2/login.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("log_tag", "connection success ");
Toast.makeText(getApplicationContext(), "pass", Toast.LENGTH_SHORT).show();
}
catch(Exception e)
{
Log.e("log_tag", "Error in http connection "+e.toString());
Toast.makeText(getApplicationContext(), "Connection fail", Toast.LENGTH_SHORT).show();
}
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");
Intent i = new Intent(getBaseContext(),Menu.class);
startActivity(i);
}
is.close();
result=sb.toString();
}
catch(Exception e)
{
Log.e("log_tag", "Error converting result "+e.toString());
}
try{
JSONObject object = new JSONObject(result);
String ch=object.getString("re");
Toast.makeText(getApplicationContext(), ch, Toast.LENGTH_SHORT).show();
if(ch.equals("success"))
{
Intent i=new Intent("com.example.hell.MainActivity");
startActivity(i);
}
else
{
Toast.makeText(getApplicationContext(), "Record is not available.. Enter valid number", Toast.LENGTH_SHORT).show();
}
}
catch(JSONException e)
{
Log.e("log_tag", "Error parsing data "+e.toString());
Toast.makeText(getApplicationContext(), "JsonArray fail", Toast.LENGTH_SHORT).show();
}
}
});
}
@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;
}
}
请帮我解决一下。
这里是登录表单的PHP代码
<?php
session_start();
$id=$_REQUEST["id"];
$password=$_REQUEST["password"];
if($id==NULL&& $password==NULL)
{
$r["re"]="Enter the Registered Id and password!!!";
print(json_encode($r));
die('Could not connect: ' . mysql_error());
}
else
{
$connect=mysql_connect("localhost","root","") or die("couldn't connect");
mysql_select_db("android") or die("couldn't find database");
$query=mysql_query("SELECT * From profile WHERE username='$email'");
$numrows=mysql_num_rows($query);
while($rows=mysql_fetch_assoc($query))
{
$dbusername=$rows['id'];
$dbpassword=$rows['password'];
}
if($id==$dbusername && $password==$dbpassword)
{
// echo("you're in! <a href='member.php'>click</a>here to enter");
// $_SESSION ['email']=$dbusername;
$r["re"]="success";
print(json_encode($r));
}
else
{
$r["re"]="fail";
print(json_encode($r));
}
}
?>
我的 logcat 显示以下错误。
03-23 05:50:37.970: E/AndroidRuntime(904): FATAL EXCEPTION: main
03-23 05:50:37.970: E/AndroidRuntime(904): Process: com.example.hell, PID: 904
03-23 05:50:37.970: E/AndroidRuntime(904): java.lang.NullPointerException
03-23 05:50:37.970: E/AndroidRuntime(904): at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
03-23 05:50:37.970: E/AndroidRuntime(904): at org.json.JSONTokener.nextValue(JSONTokener.java:94)
03-23 05:50:37.970: E/AndroidRuntime(904): at org.json.JSONObject.<init>(JSONObject.java:155)
03-23 05:50:37.970: E/AndroidRuntime(904): at org.json.JSONObject.<init>(JSONObject.java:172)
03-23 05:50:37.970: E/AndroidRuntime(904): at com.example.hell.MainActivity$1.onClick(MainActivity.java:100)
03-23 05:50:37.970: E/AndroidRuntime(904): at android.view.View.performClick(View.java:4424)
03-23 05:50:37.970: E/AndroidRuntime(904): at android.view.View$PerformClick.run(View.java:18383)
03-23 05:50:37.970: E/AndroidRuntime(904): at android.os.Handler.handleCallback(Handler.java:733)
03-23 05:50:37.970: E/AndroidRuntime(904): at android.os.Handler.dispatchMessage(Handler.java:95)
03-23 05:50:37.970: E/AndroidRuntime(904): at android.os.Looper.loop(Looper.java:137)
03-23 05:50:37.970: E/AndroidRuntime(904): at android.app.ActivityThread.main(ActivityThread.java:4998)
03-23 05:50:37.970: E/AndroidRuntime(904): at java.lang.reflect.Method.invokeNative(Native Method)
03-23 05:50:37.970: E/AndroidRuntime(904): at java.lang.reflect.Method.invoke(Method.java:515)
03-23 05:50:37.970: E/AndroidRuntime(904): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
03-23 05:50:37.970: E/AndroidRuntime(904): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
03-23 05:50:37.970: E/AndroidRuntime(904): at dalvik.system.NativeStart.main(Native Method)
thank u...but it shows stop working after click submit button
谢谢你...但它显示点击提交按钮后停止工作 我需要检索数据以在 android 模拟器上显示
包 com.example.main;导入 java.io.BufferedReader；导入 java.io.InputStream；导入 java.io.InputStreamReader；导入 java.text.NumberFormat；导入 java.util.ArrayList;
导入 org.apache.http.HttpEntity;导入 org.apache.http.HttpResponse；导入 org.apache.http.NameValuePair；导入 org.apache.http.client.HttpClient；导入 org.apache.http.client.entity.UrlEncodedFormEntity；导入 org.apache.http.client.methods.HttpPost；导入 org.apache.http.impl.client.DefaultHttpClient；导入 org.apache.http.message.BasicNameValuePair；导入 org.json.JSONException；导入 org.json.JSONObject;
导入 android.annotation.SuppressLint;导入android.app.Activity；导入android.os.Bundle；导入android.os.StrictMode；导入android.util.Log；导入android.view.View；导入android.widget.Button；导入 android.widget.EditText；导入android.widget.Toast；
@SuppressLint("NewApi") 公共类选择扩展 Activity { @SuppressLint("NewApi") StrictMode.ThreadPolicy 策略 = new StrictMode.ThreadPolicy.Builder().permitAll().build();
@SuppressLint("NewApi") public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.select);
Button button = (Button) findViewById(R.id.button1);
StrictMode.setThreadPolicy(policy);
button.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view)
{
String result = null;
InputStream is = null;
EditText editText = (EditText)findViewById(R.id.e1);
String v1 = editText.getText().toString();
EditText editText1 = (EditText)findViewById(R.id.e2);
EditText editText2 = (EditText)findViewById(R.id.e3);
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("f1",v1));
try
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/select.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("log_tag", "connection success ");
}
catch(Exception e)
{
Log.e("log_tag", "Error in http connection "+e.toString());
Toast.makeText(getApplicationContext(), "Connection fail", Toast.LENGTH_SHORT).show();
}
//convert response to string
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();
result=sb.toString();
}
catch(Exception e)
{
Log.e("log_tag", "Error converting result "+e.toString());
Toast.makeText(getApplicationContext(), " Input reading fail", Toast.LENGTH_SHORT).show();
}
//parse json data
try{
JSONObject object = new JSONObject(result);
String ch=object.getString("re");
if(ch.equals("success"))
{
JSONObject no = object.getJSONObject("0");
String w= no.getString("f2");
long e=no.getLong("f3");
editText1.setText(w);
String myString = NumberFormat.getInstance().format(e);
editText2.setText(myString);
}
else
{
Toast.makeText(getApplicationContext(), "Record is not available.. Enter valid number", Toast.LENGTH_SHORT).show();
}
}
catch(JSONException e)
{
Log.e("log_tag", "Error parsing data "+e.toString());
Toast.makeText(getApplicationContext(), "JsonArray fail", Toast.LENGTH_SHORT).show();
}
}
});
}
}
【问题讨论】：
-
这是关于 php 代码的。所以你必须显示该信息
-
谢谢。我刚刚添加了php代码。
-
谢谢你...但点击提交按钮后显示停止工作
-
对不起...但我需要知道它对不起我在我的 php 代码中将我的代码写为 print (json_encode($row)) 再次显示错误，因为 jsonarray 失败...跨度>