我正在尝试使用安卓应用程序将参数传递给php文件。它将价格，名称和描述传递给php文件，然后将其插入SQL Server数据库。
这是我的代码：
package com.example.androidhive;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
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 NewProductActivity extends Activity {
// Progress Dialog
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
EditText inputName;
EditText inputPrice;
EditText inputDesc;
// url to create new product
private static String url_create_product = "http://127.0.0.1/android_connect/create_product.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_product);
InputStream is = new InputStream() {
@Override
public int read() throws IOException {
// TODO Auto-generated method stub
return 0;
}
};
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"), 8);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Edit Text
inputName = (EditText) findViewById(R.id.inputName);
inputPrice = (EditText) findViewById(R.id.inputPrice);
inputDesc = (EditText) findViewById(R.id.inputDesc);
// Create button
Button btnCreateProduct = (Button) findViewById(R.id.btnCreateProduct);
// button click event
btnCreateProduct.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// creating new product in background thread
new CreateNewProduct().execute();
}
});
}
/**
* 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(NewProductActivity.this);
pDialog.setMessage("Creating Product..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Creating product
* */
protected String doInBackground(String... args) {
String name = inputName.getText().toString();
String price = inputPrice.getText().toString();
String description = inputDesc.getText().toString();
// 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));
// 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(getApplicationContext(), AllProductsActivity.class);
startActivity(i);
// closing this screen
finish();
} else {
// failed to create 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 done
pDialog.dismiss();
}
}
}
我在日志猫文件中收到错误，如下所示：
E/JSON Parser(371): Error parsing data org.json.JSONException: Value Unknown of type java.lang.String cannot be converted to JSONObject
E/AndroidRuntime(371): FATAL EXCEPTION: AsyncTask #1
E/AndroidRuntime(371): java.lang.RuntimeException: An error occured while executing doInBackground()
E/AndroidRuntime(371): at android.os.AsyncTask$3.done(AsyncTask.java:200)
E/AndroidRuntime(371): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
E/AndroidRuntime(371): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
E/AndroidRuntime(371): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
E/AndroidRuntime(371): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
E/AndroidRuntime(371): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
E/AndroidRuntime(371): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
E/AndroidRuntime(371): at java.lang.Thread.run(Thread.java:1019)
E/AndroidRuntime(371): Caused by: java.lang.NullPointerException
E/AndroidRuntime(371): at com.example.androidhive.NewProductActivity$CreateNewProduct.doInBackground(NewProductActivity.java:99)
E/AndroidRuntime(371): at com.example.androidhive.NewProductActivity$CreateNewProduct.doInBackground(NewProductActivity.java:1)
E/AndroidRuntime(371): at android.os.AsyncTask$2.call(AsyncTask.java:185)
E/AndroidRuntime(371): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
E/AndroidRuntime(371): ... 4 more
E/WindowManager(371): Activity com.example.androidhive.NewProductActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40539530 that was originally added here
E/WindowManager(371): android.view.WindowLeaked: Activity com.example.androidhive.NewProductActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40539530 that was originally added here
E/WindowManager(371): at android.view.ViewRoot.<init>(ViewRoot.java:258)
E/WindowManager(371): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
E/WindowManager(371): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
E/WindowManager(371): at android.view.Window$LocalWindowManager.addView(Window.java:424)
E/WindowManager(371): at android.app.Dialog.show(Dialog.java:241)
E/WindowManager(371): at com.example.androidhive.NewProductActivity$CreateNewProduct.onPreExecute(NewProductActivity.java:76)
E/WindowManager(371): at android.os.AsyncTask.execute(AsyncTask.java:391)
E/WindowManager(371): at com.example.androidhive.NewProductActivity$1.onClick(NewProductActivity.java:56)
E/WindowManager(371): at android.view.View.performClick(View.java:2485)
E/WindowManager(371): at android.view.View$PerformClick.run(View.java:9080)
E/WindowManager(371): at android.os.Handler.handleCallback(Handler.java:587)
E/WindowManager(371): at android.os.Handler.dispatchMessage(Handler.java:92)
E/WindowManager(371): at android.os.Looper.loop(Looper.java:123)
E/WindowManager(371): at android.app.ActivityThread.main(ActivityThread.java:3683)
E/WindowManager(371): at java.lang.reflect.Method.invokeNative(Native Method)
E/WindowManager(371): at java.lang.reflect.Method.invoke(Method.java:507)
E/WindowManager(371): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
E/WindowManager(371): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
E/WindowManager(371): at dalvik.system.NativeStart.main(Native Method)
提前感谢您的帮助。
亲爱的
朋友使用这段代码将数据发送到PHP中，这对我很有用，我希望这也对您使用了完整的功能。
String url = "http://127.0.0.1/android_connect/create_product.php";
URL obj = new URL(url);
HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
//add request header
con.setRequestMethod("POST");
con.setRequestProperty("User-Agent", USER_AGENT);
con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
String urlParameters = "name=abc&price=2345&description=description";
// Send post request
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
int responseCode = con.getResponseCode();
BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
//print result
System.out.println(response.toString());
这里的问题是您将String分配给JSONObject。你要做的是
错误
E/JSON Parser(371): Error parsing data org.json.JSONException: Value Unknown of type java.lang.String cannot be converted to JSONObject
您必须修改此代码
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_create_product,
"POST", params);
收件人（假设您以字符串形式收到来自服务器的回复JSON）
String response = jsonParser.makeHttpRequest(url_create_product,
"POST", params);
JSONObject json = new JSONObject(response);
希望对你有帮助