不知怎的，这段代码不起作用......有什么建议吗？
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.example.androidhive.R;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class EditProductActivity extends Activity {
EditText txtName;
EditText txtPrice;
EditText txtDesc;
EditText txtCreatedAt;
Button btnSave;
Button btnDelete;
String pid;
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
private static final String url_product_detials = "http://192.168.2.36/android_connect/get_product_details.php";
private static final String url_update_product = "http://192.168.2.36/android_connect/update_product.php";
private static final String url_delete_product = "http://192.168.2.36/android_connect/delete_product.php";
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCT = "product";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "name";
private static final String TAG_PRICE = "price";
private static final String TAG_DESCRIPTION = "description";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_product);
btnSave = (Button) findViewById(R.id.btnSave);
btnDelete = (Button) findViewById(R.id.btnDelete);
Intent i = getIntent();
pid = i.getStringExtra(TAG_PID);
new GetProductDetails().execute();
btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// starting background task to update product
new SaveProductDetails().execute();
}
});
btnDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
new DeleteProduct().execute();
}
});
}
class GetProductDetails extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditProductActivity.this);
pDialog.setMessage("Loading product details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
protected String doInBackground(String... params) {
runOnUiThread(new Runnable() {
public void run() {
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
JSONObject json = jsonParser.makeHttpRequest(
url_product_detials, "GET", params);
Log.d("Single Product Details", json.toString());
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
JSONArray productObj = json
.getJSONArray(TAG_PRODUCT); // JSON Array
JSONObject product = productObj.getJSONObject(0);
txtName = (EditText) findViewById(R.id.inputName);
txtPrice = (EditText) findViewById(R.id.inputPrice);
txtDesc = (EditText) findViewById(R.id.inputDesc);
txtName.setText(product.getString(TAG_NAME));
txtPrice.setText(product.getString(TAG_PRICE));
txtDesc.setText(product.getString(TAG_DESCRIPTION));
}else{
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
}
}
class SaveProductDetails extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditProductActivity.this);
pDialog.setMessage("Saving product ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
protected String doInBackground(String... args) {
String name = txtName.getText().toString();
String price = txtPrice.getText().toString();
String description = txtDesc.getText().toString();
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair(TAG_PID, pid));
params.add(new BasicNameValuePair(TAG_NAME, name));
params.add(new BasicNameValuePair(TAG_PRICE, price));
params.add(new BasicNameValuePair(TAG_DESCRIPTION, description));
JSONObject json = jsonParser.makeHttpRequest(url_update_product,
"POST", params);
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Intent i = getIntent();
setResult(100, i);
finish();
} else {
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
}
}
class DeleteProduct extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditProductActivity.this);
pDialog.setMessage("Deleting Product...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
protected String doInBackground(String... args) {
int success;
try {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
JSONObject json = jsonParser.makeHttpRequest(
url_delete_product, "POST", params);
Log.d("Delete Product", json.toString());
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Intent i = getIntent();
setResult(100, i);
finish();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
}
}
}
这是更新产品的PHP代码
<?php
$response = array();
if (isset($_POST['pid']) && isset($_POST['name']) && isset($_POST['price']) && isset($_POST['description'])) {
$pid = $_POST['pid'];
$name = $_POST['name'];
$price = $_POST['price'];
$description = $_POST['description'];
$link = mysqli_connect("localhost","tahapan","12345","androidhive") or die("Error " . mysqli_error($link));
$query = "UPDATE products SET name = '$name', price = '$price', description = '$description' WHERE pid = $pid";
$result = $link->query($query) or die("Error in the consult.." . mysqli_error($link));
if ($result) {
$response["success"] = 1;
$response["message"] = "Product successfully updated.";
echo json_encode($response);
} else {
}
} else {
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
echo json_encode($response);
}
?>
每次我尝试运行应用程序并执行更新产品..发生错误 我不知道该怎么办... 请帮忙 谢谢你们..