我想制作一个Android应用，当它打开互联网连接时，它将使用本地SQLite数据库中的值更新服务器上的数据
这是我的活动代码。
public class SyncCollectActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
private CollectDataHelper dbHelper;
private ListView list;
private List<SyncCollect> syncs;
Cursor cursor;
public static final int NAME_SYNCED_WITH_SERVER = 1;
public static final int NAME_NOT_SYNCED_WITH_SERVER = 0;
public static final String DATA_SAVED_BROADCAST = "id.habatus.datasaved";
private BroadcastReceiver broadcastReceiver;
private SyncCollectAdapter adapter;
Button col, drop;
ImageButton back;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sync_collect);
dbHelper = new CollectDataHelper(this);
syncs = new ArrayList<>();
list = findViewById(R.id.listViewNames);
list.setOnItemClickListener(this);
drop = findViewById(R.id.btncanvas);
back = findViewById(R.id.kembali);
loadData();
broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//loading the names again
loadData();
refresh();
}
};
registerReceiver(broadcastReceiver, new IntentFilter(DATA_SAVED_BROADCAST));
drop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(SyncCollectActivity.this,SyncActivity.class);
startActivity(i);
}
});
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(SyncCollectActivity.this,DecisionActivity.class);
startActivity(i);
}
});
}
private void loadData() {
syncs.clear();
Cursor cursor = dbHelper.getData();
if (cursor.moveToFirst()){
while (cursor.moveToNext()){
SyncCollect sync = new SyncCollect(
cursor.getString(cursor.getColumnIndexOrThrow("id_p")),
cursor.getString(cursor.getColumnIndexOrThrow("nama")),
cursor.getString(cursor.getColumnIndexOrThrow("alamat")),
cursor.getString(cursor.getColumnIndexOrThrow("saldo")),
cursor.getString(cursor.getColumnIndexOrThrow("pinjaman")),
cursor.getString(cursor.getColumnIndexOrThrow("angsuran")),
cursor.getString(cursor.getColumnIndexOrThrow("keterangan")),
cursor.getString(cursor.getColumnIndexOrThrow("latitude")),
cursor.getString(cursor.getColumnIndexOrThrow("longitude")),
cursor.getString(cursor.getColumnIndexOrThrow("status")),
cursor.getInt(cursor.getColumnIndexOrThrow(CollectDataHelper.syncstatus))
);
syncs.add(sync);
}
}
adapter = new SyncCollectAdapter(this.getApplicationContext(),R.layout.sync_item2,syncs);
list.setAdapter(adapter);
}
public void refresh(){
adapter.notifyDataSetChanged();
}
@Override
public void onResume() {
super.onResume();
registerReceiver(broadcastReceiver, new IntentFilter(android.net.ConnectivityManager.CONNECTIVITY_ACTION));
}
@Override
public void onPause() {
unregisterReceiver(broadcastReceiver);
super.onPause();
}
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
}
}
这是我的网址。
public static final String URL_COL_SYNC = "http://192.168.4.9/SqliteSync/colsync.php?id_p=";
该类是我将SQLite数据库中的数据更新到服务器的方法。
public class NetworkCollect extends BroadcastReceiver {
private Context context;
private CollectDataHelper db;
@Override
public void onReceive(Context context, Intent intent) {
this.context = context;
db = new CollectDataHelper(context);
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if (activeNetwork != null){
if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI || activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE){
Cursor cursor = db.getUnsynced();
while (cursor.moveToNext()){
save(
cursor.getString(cursor.getColumnIndex(CollectDataHelper.nama)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.alamat)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.saldo)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.pinjaman)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.angsuran)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.keterangan)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.latitude)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.longitude)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.status)),
cursor.getString(cursor.getColumnIndex(CollectDataHelper.id_p))
);
}
}
}
}
private void save( final String nama, final String alamat,final String saldo,final String pinjaman,
final String angsuran, final String keterangan,final String latitude,final String longitude,final String status,final String id_p){
StringRequest request = new StringRequest(Request.Method.POST, Konfigurasi.URL_COL_SYNC, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject obj = new JSONObject(response);
if (!obj.getBoolean("error")) {
//updating the status in sqlite
db.updatelocal(id_p, SyncCollectActivity.NAME_SYNCED_WITH_SERVER);
//sending the broadcast to refresh the list
context.sendBroadcast(new Intent(SyncCollectActivity.DATA_SAVED_BROADCAST));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String,String> Params = new HashMap<>();
Params.put("nama",nama);
Params.put("alamat",alamat);
Params.put("saldo",saldo);
Params.put("pinjaman",pinjaman);
Params.put("angsuran",angsuran);
Params.put("keterangan",keterangan);
Params.put("latitude",latitude);
Params.put("longitude",longitude);
Params.put("status",status);
Params.put("id_p",id_p);
return Params;
}
};
VolleySingleton.getInstance(context).addToRequestQueue(request);
}
}
这是我的php代码，用于更新服务器数据。
<?php
/*
* Database Constants
* Make sure you are putting the values according to your database here
*/
define('DB_HOST','localhost');
define('DB_USERNAME','root');
define('DB_PASSWORD','');
define('DB_NAME', 'user');
//Connecting to the database
$conn = new mysqli(DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME);
//checking the successful connection
if($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
//making an array to store the response
$response = array();
//if there is a post request move ahead
if($_SERVER['REQUEST_METHOD']=='POST'){
//getting the name from request
$id_p = $_POST['id_p'];
$nama =$_POST['nama'];
$alamat = $_POST['alamat'];
$saldo = $_POST['saldo'];
$pinjaman = $_POST['pinjaman'];
$angsuran = $_POST['angsuran'];
$keterangan = $_POST['keterangan'];
$latitude = $_POST['latitude'];
$longitude = $_POST['longitude'];
$status = $_POST['status'];
//creating a statement to insert to database
$stmt = $conn->prepare("UPDATE collect SET nama=?, alamat=?, saldo=?, pinjaman=?, angsuran=?, keterangan=?, latitude=?, longitude=?, status=?, WHERE id_p=?");
//binding the parameter to statement
$stmt->bind_param("ssssssssss", $nama,$alamat,$saldo,$pinjaman,$angsuran,$keterangan,$latitude,$longitude,$status,$id_p);
//if data inserts successfully
if($stmt->execute()){
//making success response
$response['error'] = false;
$response['message'] = 'Saved successfully';
}else{
//if not making failure response
$response['error'] = true;
$response['message'] = 'Please try later';
}
}else{
$response['error'] = true;
$response['message'] = "Invalid request";
}
//displaying the data in json format
echo json_encode($response);
?>
在我的php代码中，我使用了一条准备好的语句来将数据更新到服务器。
我是根据网站上的教程制作的，但这是用于插入的，我要使其不插入而是更新。我试图对广播接收器使用intent.putextra，但是NetworkCollect类的save方法不起作用。更糟糕的是也不例外。也许有人可以帮忙吗？
我希望有人能帮助我找到解决方案。
非常感谢您。