我正在尝试连接我的Android应用程序，该应用程序使用php连接到数据库的Login页面。它正在连接到DB。但它没有从表中检索所有颜色。相反，只取出两个颜色。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;
}
}
请帮我解决问题。
这是登录表单的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......但是点击提交按钮后显示停止工作 我需要检索要在android模拟器上显示的数据
package com.example.main; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.text.NumberFormat; import java.util.ArrayList;
import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.json.JSONException; import org.json.JSONObject;
import android.annotation.SuppressLint; import android.app.Activity; import android.os.Bundle; import android.os.StrictMode; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast;
@SuppressLint（“NewApi”）public class select extends Activity { @SuppressLint（“NewApi”）StrictMode.ThreadPolicy policy = 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();
}
}
});
}
}
答案 0 :(得分：0)
行。我在PHP代码中看到你只返回$ r给客户端，所以它不包含任何有关配置文件的东西。
所以你应该返回$ row（编码成json）