当我尝试将我的应用程序连接到 MySQL 数据库时，应用程序突然停止。我认为问题出在我编写的 jasonparser 类上。我需要接受提交的文件而不发布任何内容。我应该如何改变我的课程..我的 JasonParsor 如下所示
package com.mahavega.qcdemo;
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 method
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "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 == "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;
}
}
我要显示数据的活动是
package com.mahavega.qcdemo;
import java.util.ArrayList;
import java.util.List;
import com.mahavega.qcdemo.R;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.util.Log;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.TextView;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends Activity implements OnClickListener {
JSONParser jsonParser = new JSONParser();
private static final String url_product_detials = "http://neogdgt.com/mob/get_det.php";
private static final String TAG_SUCCESS = "success";
private static final String TAG_EVENT = "event";
private static final String TAG_EVENTITLE = "event_title";
private static final String TAG_EVENTDET = "event_details";
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
// Condetect cd = new Condetect(getApplicationContext());
// Boolean isInternetPresent = cd.isConnectingToInternet();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gestureDetector = new GestureDetector(this, new MyGestureDetector());
gestureListener = new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
};
new GetEventDetails().execute();
ImageView ad = (ImageView) findViewById(R.id.imageView1);
ImageView im2 = (ImageView) findViewById(R.id.imageView2);
ImageView im3 = (ImageView) findViewById(R.id.imageView3);
ImageView im4 = (ImageView) findViewById(R.id.imageView4);
ImageView im5 = (ImageView) findViewById(R.id.imageView5);
ad.setOnClickListener(MainActivity.this);
im2.setOnTouchListener(gestureListener);
im2.setOnClickListener(MainActivity.this);
im3.setOnTouchListener(gestureListener);
im3.setOnClickListener(MainActivity.this);
im4.setOnTouchListener(gestureListener);
im4.setOnClickListener(MainActivity.this);
im5.setOnTouchListener(gestureListener);
im5.setOnClickListener(MainActivity.this);
ad.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
boolean inet = isOnline();
if (inet)
{
startActivity(new Intent(MainActivity.this, Adds.class));
overridePendingTransition(R.anim.slide_left, R.anim.slide_right);
finish();
}
else {
displayAlert();
}
}
});
}
@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;
}
class MyGestureDetector extends SimpleOnGestureListener {
@Override
public boolean onFling (MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
float sensitvity = 50;
if((e1.getX() - e2.getX()) < sensitvity){
startActivity(new Intent(MainActivity.this, Login.class));
overridePendingTransition(R.anim.slide_right, R.anim.slide_left);
finish();
}
else if((e2.getX() - e1.getX()) > sensitvity){
startActivity(new Intent(MainActivity.this, Login.class));
overridePendingTransition(R.anim.slide_right, R.anim.slide_left);
finish(); }
return super.onFling(e1, e2, velocityX, velocityY);
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
@Override
public void onBackPressed() {
finish();
super.onBackPressed();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ( keyCode == KeyEvent.KEYCODE_BACK
&& event.getRepeatCount() == 0) {
onBackPressed();
}
return true;
}
public boolean isOnline() {
ConnectivityManager cm =
(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
}
return false;
}
public void displayAlert()
{
new AlertDialog.Builder(this).setMessage("Please Check Your Internet Connection and Try Again")
.setTitle("Network Error")
.setCancelable(true)
.setNeutralButton(android.R.string.ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton){
}
})
.show();
}
class GetEventDetails extends AsyncTask<String, String, String> {
/**
* Getting product details in background thread
* */
protected String doInBackground(String... params) {
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// Check for success tag
int success;
try {
// Building Parameters
String pid="1";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
// getting product details by making HTTP request
// Note that product details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(
url_product_detials, "GET", params);
// check your log for json response
Log.d("Single Product Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received product details
JSONArray eventObj = json
.getJSONArray(TAG_EVENT); // JSON Array
// get first product object from JSON Array
JSONObject event = eventObj.getJSONObject(0);
// product with this pid found
TextView txtEventname=(TextView) findViewById(R.id.textView2);
TextView txtEventdet=(TextView) findViewById(R.id.textView3);
// Edit Text
txtEventname.setText(event.getString(TAG_EVENTITLE));
txtEventdet.setText(event.getString(TAG_EVENTDET));
}else{
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
}
}
我的 getdetails.php 类是
<?php
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// check for post data
// get a product from products table
$result = mysql_query("SELECT *FROM tb_event_details WHERE event_id=1");
if (!empty($result)) {
// check for empty result
if (mysql_num_rows($result) > 0) {
$result = mysql_fetch_array($result);
$events = array();
$events["event_id"] = $result["event_id"];
$events["event_title"] = $result["event_title"];
$events["event_details"] = $result["event_details"];
// success
$response["success"] = 1;
// user node
$response["events"] = array();
array_push($response["events"], $events);
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No event found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No event found";
// echo no users JSON
echo json_encode($response);
}
?>