我已开发和应用程序，因为我需要将本地数据库同步到远程我的sql数据库，所以我已经在mysql中创建了一个表，并为这些脚本文件编写了一些脚本
<?php
class DB_Functions {
private $db;
//put your code here
// constructor
function __construct() {
include_once './db_connect.php';
// connecting to database
$this->db = new DB_Connect();
$this->db->connect();
}
// destructor
function __destruct() {
}
/**
* Storing new user
* returns user details
*/
public function storeUser($Name,$Email,$Phnum) {
// Insert user into database
$result = mysql_query("INSERT INTO games(name,email,phno)VALUES('$Name','$Email',$Phnum)");
if ($result) {
return true;
} else {
if( mysql_errno() == 1062) {
// Duplicate key - Primary Key Violation
return true;
} else {
// For other errors
return false;
}
}
}
/**
* Getting all users
*/
public function getAllUsers() {
$result = mysql_query("select name,email,phno FROM games");
return $result;
}
}
?>
这是我的insertuser.php文件
<?php
include_once './db_functions.php';
//Create Object for DB_Functions clas
$db = new DB_Functions();
//Get JSON posted by Android Application
$json = $_POST["usersJSON"];
//Remove Slashes
if (get_magic_quotes_gpc()){
$json = stripslashes($json);
}
//Decode JSON into an Array
$data = json_decode($json);
//Util arrays to create response JSON
$a=array();
$b=array();
//Loop through an Array and insert data read from JSON into MySQL DB
for($i=0; $i<count($data) ; $i++)
{
//Store User into MySQL DB
$res = $db->storeUser($data[$i]->userName,$data[$i]->userEmail,$data[$i]->userPhno);
//Based on insertion, create JSON response
if($res){
$b["name"] = $data[$i]->userName;
$b["status"] = 'yes';
array_push($a,$b);
}else{
$b["name"] = $data[$i]->userName;
$b["status"] = 'no';
array_push($a,$b);
}
}
//Post JSON response back to Android Application
echo json_encode($a);
?>
这是我的DBController.java文件
public class DBController extends SQLiteOpenHelper {
public DBController(Context applicationcontext) {
super(applicationcontext, "syncscore.db", null, 1);
}
//Creates Table
@Override
public void onCreate(SQLiteDatabase database) {
String query;
query = "CREATE TABLE games ( userName TEXT, userEmail TEXT,userPhno TEXT, udpateStatus TEXT)";
database.execSQL(query);
}
@Override
public void onUpgrade(SQLiteDatabase database, int version_old, int current_version) {
String query;
query = "DROP TABLE IF EXISTS games";
database.execSQL(query);
onCreate(database);
}
/**
* Inserts User into SQLite DB
* @param queryValues
*/
public void insertUser(HashMap<String, String> queryValues) {
SQLiteDatabase database = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("userName", queryValues.get("userName"));
values.put("userEmail", queryValues.get("userEmail"));
values.put("userPhno", queryValues.get("userPhno"));
values.put("udpateStatus", "no");
database.insert("games", null, values);
database.close();
}
/**
* Get list of Users from SQLite DB as Array List
* @return
*/
public ArrayList<HashMap<String, String>> getAllUsers() {
ArrayList<HashMap<String, String>> wordList;
wordList = new ArrayList<HashMap<String, String>>();
String selectQuery = "SELECT * FROM games";
SQLiteDatabase database = this.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
HashMap<String, String> map = new HashMap<String, String>();
map.put("userName", cursor.getString(0));
map.put("userEmail", cursor.getString(1));
map.put("userPhno", cursor.getString(2));
wordList.add(map);
} while (cursor.moveToNext());
}
database.close();
return wordList;
}
/**
* Compose JSON out of SQLite records
* @return
*/
public String composeJSONfromSQLite(){
ArrayList<HashMap<String, String>> wordList;
wordList = new ArrayList<HashMap<String, String>>();
String selectQuery = "SELECT * FROM games where udpateStatus = '"+"no"+"'";
SQLiteDatabase database = this.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
HashMap<String, String> map = new HashMap<String, String>();
map.put("userName", cursor.getString(0));
map.put("userEmail", cursor.getString(1));
map.put("userPhno", cursor.getString(2));
wordList.add(map);
} while (cursor.moveToNext());
}
database.close();
Gson gson = new GsonBuilder().create();
//Use GSON to serialize Array List to JSON
return gson.toJson(wordList);
}
/**
* Get Sync status of SQLite
* @return
*/
public String getSyncStatus(){
String msg = null;
if(this.dbSyncCount() == 0){
msg = "SQLite and Remote MySQL DBs are in Sync!";
}else{
msg = "DB Sync needed\n";
}
return msg;
}
/**
* Get SQLite records that are yet to be Synced
* @return
*/
public int dbSyncCount(){
int count = 0;
String selectQuery = "SELECT * FROM games where udpateStatus = '"+"no"+"'";
SQLiteDatabase database = this.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
count = cursor.getCount();
database.close();
return count;
}
/**
* Update Sync status against each User ID
* @param id
* @param status
*/
public void updateSyncStatus(String name, String status){
SQLiteDatabase database = this.getWritableDatabase();
String updateQuery = "Update games set udpateStatus = '"+ status +"' where userName="+"'"+ name +"'";
Log.d("query",updateQuery);
database.execSQL(updateQuery);
database.close();
}
}
这是我的MainActivity.java文件
public class MainActivity extends Activity {
//DB Class to perform DB related operations
DBController controller = new DBController(this);
//Progress Dialog Object
ProgressDialog prgDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Get User records from SQLite DB
ArrayList<HashMap<String, String>> userList = controller.getAllUsers();
//
if(userList.size()!=0){
//Set the User Array list in ListView
ListAdapter adapter = new SimpleAdapter( MainActivity.this,userList, R.layout.view_user_entry, new String[] { "userId","userName"}, new int[] {R.id.userId, R.id.userName});
ListView myList=(ListView)findViewById(android.R.id.list);
myList.setAdapter(adapter);
//Display Sync status of SQLite DB
Toast.makeText(getApplicationContext(), controller.getSyncStatus(), Toast.LENGTH_LONG).show();
}
//Initialize Progress Dialog properties
prgDialog = new ProgressDialog(this);
prgDialog.setMessage("Synching SQLite Data with Remote MySQL DB. Please wait...");
prgDialog.setCancelable(false);
}
@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;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//When Sync action button is clicked
if (id == R.id.refresh) {
//Sync SQLite DB data to remote MySQL DB
syncSQLiteMySQLDB();
return true;
}
return super.onOptionsItemSelected(item);
}
//Add User method getting called on clicking (+) button
public void addUser(View view) {
Intent objIntent = new Intent(getApplicationContext(), NewUser.class);
startActivity(objIntent);
}
public void syncSQLiteMySQLDB(){
//Create AsycHttpClient object
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
ArrayList<HashMap<String, String>> userList = controller.getAllUsers();
if(userList.size()!=0){
if(controller.dbSyncCount() != 0){
prgDialog.show();
params.put("usersJSON", controller.composeJSONfromSQLite());
client.post("http://10.0.2.2/syncscore/viewusers.php",params ,new AsyncHttpResponseHandler() {
@Override
public void onSuccess(String response) {
System.out.println(response);
prgDialog.hide();
try {
JSONArray arr = new JSONArray(response);
System.out.println(arr.length());
for(int i=0; i<arr.length();i++){
JSONObject obj = (JSONObject)arr.get(i);
//System.out.println(obj.get("name"));
//System.out.println(obj.get("status"));
controller.updateSyncStatus(obj.get("name").toString(),obj.get("status").toString());
}
Toast.makeText(getApplicationContext(), "DB Sync completed!", Toast.LENGTH_LONG).show();
} catch (JSONException e) {
// TODO Auto-generated catch block
Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response might be invalid]!", Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
@Override
public void onFailure(int statusCode, Throwable error,
String content) {
// TODO Auto-generated method stub
prgDialog.hide();
if(statusCode == 404){
Toast.makeText(getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
}else if(statusCode == 500){
Toast.makeText(getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet]", Toast.LENGTH_LONG).show();
}
}
});
}else{
Toast.makeText(getApplicationContext(), "SQLite and Remote MySQL DBs are in Sync!", Toast.LENGTH_LONG).show();
}
}else{
Toast.makeText(getApplicationContext(), "No data in SQLite DB, please do enter User name to perform Sync action", Toast.LENGTH_LONG).show();
}
}
}
在模拟器中运行此应用程序后，用户输入的数据存储在本地数据库中，如果我在应用程序中单击一个名为sync的按钮，则表示JSON服务器响应可能无效。
任何人都可以让我知道我错在哪里..？从2天开始坚持这个请帮助解决这个问题 谢谢 请检查我的Log cat
08-22 00:28:31.790: W/System.err(19929): org.json.JSONException: Value <html> of type java.lang.String cannot be converted to JSONArray
08-22 00:28:31.800: W/System.err(19929): at org.json.JSON.typeMismatch(JSON.java:111)
08-22 00:28:31.800: W/System.err(19929): at org.json.JSONArray.<init>(JSONArray.java:96)
08-22 00:28:31.810: W/System.err(19929): at org.json.JSONArray.<init>(JSONArray.java:108)
08-22 00:28:31.810: W/System.err(19929): at com.sathya.syncandroid.MainActivity$1.onSuccess(MainActivity.java:96)
08-22 00:28:31.810: W/System.err(19929): at com.loopj.android.http.AsyncHttpResponseHandler.onSuccess(AsyncHttpResponseHandler.java:232 )
08-22 00:28:31.810: W/System.err(19929): at com.loopj.android.http.AsyncHttpResponseHandler.onSuccess(AsyncHttpResponseHandler.java:220 )
08-22 00:28:31.810: W/System.err(19929): at com.loopj.android.http.AsyncHttpResponseHandler.onSuccess(AsyncHttpResponseHandler.java:245 )
08-22 00:28:31.810: W/System.err(19929): at com.loopj.android.http.AsyncHttpResponseHandler.handleMessage(AsyncHttpResponseHandler.java :365)
08-22 00:28:31.810: W/System.err(19929): at com.loopj.android.http.AsyncHttpResponseHandler$ResponderHandler.handleMessage(AsyncHttpRes ponseHandler.java:135)
08-22 00:28:31.820: W/System.err(19929): at android.os.Handler.dispatchMessage(Handler.java:102)
08-22 00:28:31.820: W/System.err(19929): at android.os.Looper.loop(Looper.java:136)
答案 0 :(得分：0)
看看你的php代码，你的响应似乎不是一个数组，它应该是一个JSONObject，总是在解析之前记录数据并检查对象图：
Log.d("mylog", "json = " + response.toString());
像这样更改你的php：
<?php
$response = array():
if(isset($_POST['usersJSON'])){
try {
$json = $_POST["usersJSON"];
include_once './db_functions.php';
$db = new DB_Functions();
if (get_magic_quotes_gpc()){
$json = stripslashes($json);
}
//pass true to json_decode
$records = json_decode($json, true);
$data = array();
foreach($records as $record){
$res = $db->storeUser($data['userName'],$data['userEmail'],$data['userPhno']);
$data['name'] = $record['userName'];
$data['name'] = $res ? 'yes' : 'no';
array_push($response['data'], $data);
}
$response['success'] = true;
} catch (Exception $e) {
$response['success'] = false;
$respnose['message'] = $e->getMessage();
}
}else{
$response['success'] = false;
$respnose['message'] = 'missing JSON data';
}
echo json_encode($response);
这样你总会得到一个回复，如果没有输入循环，你的方式就不会给你回复