我已经被这个问题困扰了将近三天。一直在网上寻找解决方案。
我正在开发一个使用 JSON 和 php mysql 进行数据管理的 android 程序。我的主要修订来自这里 http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/ .
这是我的 JSON 解析器代码:`
/*
* a JSON Parser class to get JSON from URL. This class supports two http request methods GET and POST to get json from url.
*
*/
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 mehtod
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);
Log.i("postData", httpResponse.getStatusLine().toString());
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
Log.i("value is for POST", is.toString());
}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();
Log.i("value is for GET", is.toString());
}
} 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;
}
}
`
这是我的 EditProduct 代码:
public class EditProduct extends FragmentActivity{
// EditText inputName;
// EditText inputPrice;
// EditText inputDesc;
// EditText inputQty;
ImageView preview;
ImageButton camera;
public static Bitmap bm;
Button btnSave;
Button btnDelete;
String pid;
EditText txtName;
EditText txtPrice;
EditText txtDesc;
EditText txtCreatedAt;
EditText txtQty;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// single product url
private static final String url_product_detials = "http://myweb.com/myproject/get_product_details.php";
// url to update product
private static final String url_update_product = "http://myweb.com/myproject/update_product.php";
// url to delete product
private static final String url_delete_product = "http://myweb.com/myproject/delete_product.php";
// JSON Node names
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";
private static final String TAG_IMAGE="image";
public static final String TAG_QTY = "qty";
private Uri fileUri;
private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 1;
private static final int CHOOSE_IMAGE_FROM_GALLERY=2;
public static final int MEDIA_TYPE_IMAGE = 1;
static File mediaFile;
static String mCurrentPhotoPath;
static JSONObject product;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_products);
// save button
btnSave = (Button) findViewById(R.id.btnSave);
btnDelete = (Button) findViewById(R.id.btnDelete);
//camera button
camera=(ImageButton)findViewById(R.id.imageButton1);
// getting product details from intent
Intent i = getIntent();
// getting product id (pid) from intent
pid = i.getStringExtra(TAG_PID);
// Getting complete product details in background thread
new GetProductDetails().execute();
// save button click event
btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// starting background task to update product
new SaveProductDetails().execute();
}
});
// Delete button click event
btnDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// deleting product in background thread
new DeleteProduct().execute();
}
});
//Camera button event
camera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
selectImage();
//galleryAddPic();
}
});
}
/**
* Background Async Task to Get complete product details
* */
class GetProductDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditProduct.this);
pDialog.setMessage("Loading product details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting product details in background thread
* */
protected String doInBackground(String... params) {
// updating UI from Background Thread
// Check for success tag
int success;
// Building Parameters
List<NameValuePair> paramse = new ArrayList<NameValuePair>();
paramse.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", paramse);
// check your log for json response
Log.d("Single Product Details", json.toString());
try {
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received product details
JSONArray productObj = json
.getJSONArray(TAG_PRODUCT); // JSON Array
// get first product object from JSON Array
product = productObj.getJSONObject(0);
}else{
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
// product with this pid found
// Edit Text
txtName = (EditText) findViewById(R.id.editText1);
txtPrice =(EditText)findViewById(R.id.editText3);
txtDesc = (EditText) findViewById(R.id.editText2);
txtQty=(EditText) findViewById(R.id.editText4);
preview=(ImageView)findViewById(R.id.imagePreview);
// display product data in EditText
try {
txtName.setText(product.getString(TAG_NAME));
txtPrice.setText(product.getString(TAG_PRICE));
txtDesc.setText(product.getString(TAG_DESCRIPTION));
txtQty.setText(product.getString(TAG_QTY));
preview.setImageBitmap(viewImage(product.getString(TAG_IMAGE)));
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* Background Async Task to Save product Details
* */
class SaveProductDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditProduct.this);
pDialog.setMessage("Saving product ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Saving product
* */
protected String doInBackground(String... args) {
// getting updated data from EditTexts
String name = txtName.getText().toString();
String price = txtPrice.getText().toString();
String description = txtDesc.getText().toString();
String img=preview.toString();
String qty=txtQty.getText().toString();
//Check Log untuk setiap nilai di atas yaww..
Log.d("Nilai String name lepas Saving",name);
Log.d("Nilai String price lepas Saving",price);
Log.d("Nilai String desc lepas Saving",description);
Log.d("Nilai String img lepas Saving",img);
Log.d("Nilai String qty lepas Saving",qty);
Log.d("Nilai String pid lepas Saving",pid);
try {
// Building Parameters
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));
params.add(new BasicNameValuePair(TAG_IMAGE,img));
params.add(new BasicNameValuePair(TAG_QTY,qty));
//Nak cek value params ade ke x
System.out.println(params);
// sending modified data through http request
// Notice that update product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_update_product,
"POST", params);
Log.d("Saving Response", json.toString());
// check json success tag
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully updated
Intent i = getIntent();
// send result code 100 to notify about product update
setResult(100, i);
finish();
} else {
System.out.println("Fuck not updated shit!");
// failed to update product
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product uupdated
pDialog.dismiss();
}
}
/*****************************************************************
* Background Async Task to Delete Product
* */
class DeleteProduct extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditProduct.this);
pDialog.setMessage("Deleting Product...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Deleting product
* */
protected String doInBackground(String... args) {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(
url_delete_product, "POST", params);
// check your log for json response
Log.d("Delete Product", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// product successfully deleted
// notify previous activity by sending code 100
Intent i = getIntent();
// send result code 100 to notify about product deletion
setResult(100, i);
finish();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
}
}
这是我的 AddNewProduct 代码
public class AddProducts extends Fragment{
// Progress Dialog
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
EditText inputName;
EditText inputPrice;
EditText inputDesc;
EditText inputQty;
String image_str;
ImageView preview;
// Fragment fragment=this;
Bitmap bm;
String media_photo_file;
String photo_file;
// url to create new product
private static String url_create_product ="http://myweb.com/myproject /create_product.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private Uri fileUri;
private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 1;
private static final int CHOOSE_IMAGE_FROM_GALLERY=2;
public static final int MEDIA_TYPE_IMAGE = 1;
static File mediaFile;
static String mCurrentPhotoPath;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.add_products);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View aV = inflater.inflate(R.layout.add_products,container,false);
// TextView tV1=(TextView)aV.findViewById(R.id.textView1);
inputName=(EditText)aV.findViewById(R.id.editText1);
// TextView tV2=(TextView)aV.findViewById(R.id.textView2);
inputDesc=(EditText)aV.findViewById(R.id.editText2);
// TextView tV3=(TextView)aV.findViewById(R.id.textView3);
inputPrice=(EditText)aV.findViewById(R.id.editText3);
ImageButton camera=(ImageButton)aV.findViewById(R.id.imageButton1);
// ImageButton gallery=(ImageButton)aV.findViewById(R.id.imageButton2);
preview=(ImageView)aV.findViewById(R.id.imagePreview);
// TextView tV4=(TextView)aV.findViewById(R.id.textView4);
inputQty=(EditText)aV.findViewById(R.id.editText4);
final ImageButton addItem=(ImageButton)aV.findViewById(R.id.imageButton3);
camera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
selectImage();
//galleryAddPic();
}
});
// addItem button click event
addItem.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// creating new product in background thread
if (bm==null){ /
Toast.makeText(getActivity(), "Sila Isi Semua Tempat Kosong Syaithonn..", Toast.LENGTH_LONG).show();
}
else{
new CreateNewProduct().execute();
//addItem.setEnabled(true) ;
}
}
});
return aV;
}
/**
* Button AddItem
* Background Async Task to Create new product
* */
class CreateNewProduct extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Creating Product..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Creating product
* */
@Override
protected String doInBackground(String... args) {
String name = inputName.getText().toString();
String price = inputPrice.getText().toString();
String description = inputDesc.getText().toString();
String qty=inputQty.getText().toString();
String image_str = getImageString( bm);
//Check Log for image_str value;
Log.d("Value for String image_str", image_str);
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("name", name));
params.add(new BasicNameValuePair("price", price));
params.add(new BasicNameValuePair("description", description));
params.add(new BasicNameValuePair("qty", qty));
params.add(new BasicNameValuePair("img", image_str));
System.out.println(params);
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_create_product,
"POST", params);
// check log cat fro response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
Intent i = new Intent(getActivity().getApplicationContext(), HomeActivity.class);
startActivity(i);
// closing this screen
getActivity().finish();
} else {
// failed to create product
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
@Override
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
}
}
}
这是我的 addnewproduct(创建)的 PHP 脚本:
<?php
/*
* Following code will create a new product row
* All product details are read from HTTP Post Request
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['name']) && isset($_POST['price']) && isset($_POST['description'])&& isset($_POST['qty'] )&& isset($_POST['img'] ) ) {
$name = $_POST['name'];
$price = $_POST['price'];
$description = $_POST['description'];
$qty = $_POST['qty'];
$image=$_POST['img'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$result = mysql_query("INSERT INTO products(name, price, description,qty,image ) VALUES('$name', '$price', '$description', '$qty','$image' )");
// check if row inserted or not
if ($result) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Product successfully created.";
// echoing JSON response
echo json_encode($response);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
这是我的删除产品 php 脚本
<?php
/*
* Following code will delete a product from table
* A product is identified by product id (pid)
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['pid'])) {
$pid = $_POST['pid'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql update row with matched pid
$result = mysql_query("DELETE FROM products WHERE pid = $pid");
// check if row deleted or not
if (mysql_affected_rows() > 0) {
// successfully updated
$response["success"] = 1;
$response["message"] = "Product successfully deleted";
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
我的大问题是，每当我运行并想要更新我的产品详细信息时，MySQL 内的数据根本没有更新。我的更新产品代码从这里开始:
/**
* Background Async Task to Save product Details
* */
class SaveProductDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditProduct.this);
pDialog.setMessage("Saving product ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Saving product
* */
这是我的 EditProductCode 的一部分。
我还检查了数据是否为空，但似乎一切都找到了。这是我运行上面的 SaveProductDetails 类时的 myLogcat
10-17 09:46:59.760: D/Nilai String name lepas Saving(7728): shiyh update
10-17 09:46:59.760: D/Nilai String price lepas Saving(7728): 3.00
10-17 09:46:59.760: D/Nilai String desc lepas Saving(7728): afagfeag
10-17 09:46:59.760: D/Nilai String img lepas Saving(7728): android.widget.ImageView{137dff73 V.ED.... ......I. 10,60-170,180 #7f08005a app:id/imagePreview}
10-17 09:46:59.760: D/Nilai String qty lepas Saving(7728): 3.00
10-17 09:46:59.760: D/Nilai String pid lepas Saving(7728): 11
10-17 09:46:59.760: I/System.out(7728): [pid=11, name=shiyh update, price=3.00, description=afagfeag, image=android.widget.ImageView{137dff73 V.ED.... ......I. 10,60-170,180 #7f08005a app:id/imagePreview}, qty=3.00]
10-17 09:46:59.863: I/Choreographer(7728): Skipped 61 frames! The application may be doing too much work on its main thread.
10-17 09:46:59.969: I/art(7728): Background sticky concurrent mark sweep GC freed 2613(116KB) AllocSpace objects, 0(0B) LOS objects, 689% free, 3MB/6MB, paused 3.561ms total 119.584ms
10-17 09:46:59.991: I/postData(7728): HTTP/1.1 200 OK
10-17 09:46:59.991: I/value is for POST(7728): org.apache.http.conn.EofSensorInputStream@1527e9eb
10-17 09:46:59.993: D/Saving Response(7728): {"success":0,"message":"Required field(s) is missing"}
10-17 09:46:59.994: I/System.out(7728): Fuck not updated shit!
这是我的 PHP 脚本，用于更新 SaveProductDetails 类假定的 POST 数据
<?php
/*
* Following code will update a product information
* A product is identified by product id (pid)
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['pid']) && isset($_POST['name']) && isset($_POST['price']) && isset($_POST['description'] )&& isset($_POST['img'] )&& isset($_POST['qty'] ) ) {
$pid = $_POST['pid'];
$name = $_POST['name'];
$price = $_POST['price'];
$description = $_POST['description'];
$base=$_POST['img'];
$qty = $_POST['qty'];
// include db connect class
//require_once __DIR__ . '/db_connect.php';
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql update row with matched pid
$result = mysql_query("UPDATE products SET name = '$name', price = '$price', description = '$description', image='$base', qty='$qty' WHERE pid = $pid" );
// check if row inserted or not
if ($result) {
// successfully updated
$response["success"] = 1;
$response["message"] = "Product successfully updated.";
// echoing JSON response
echo json_encode($response);
} else {
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
当我想删除产品或创建新产品时没有问题。我遇到的唯一问题是当我在 Php 脚本中使用 UPDATE 来更新数据时。谁能指导我为什么我无法使用 UPDATE 方法将数据从 android JSON 更新到 MYSql 数据库？ 提前致谢..
最佳答案
注意!! 编辑产品代码。
private static final String TAG_IMAGE="image";
...
params.add(new BasicNameValuePair(TAG_IMAGE,img));
//TAG_IMAGE="image";
PHP 脚本。
if (isset($_POST['pid']) && isset($_POST['name']) && isset($_POST['price']) && isset($_POST['description'] )&& isset($_POST['img'] )&& isset($_POST['qty'] ) ) {
//but $_POST['img'] is not existing
关于php - mysql 数据未使用 JSON 更新，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26427794/