在运行Android应用程序并按下BtnSave按钮时，我遇到了这个致命的异常。 btnDelete工作得很好。我是初学者，正在寻找代码解决方案。这是完整的错误代码。 Thx提前。
10-21 06:54:25.777 3690-3712/com.example.blackactivity E/Surface: getSlotFromBufferLocked: unknown buffer: 0xabe239d0
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: Process: com.example.blackactivity, PID: 3690
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: java.lang.RuntimeException: An error occurred while executing doInBackground()
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at android.os.AsyncTask$3.done(AsyncTask.java:309)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.util.concurrent.FutureTask.run(FutureTask.java:242)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.lang.Thread.run(Thread.java:818)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at com.example.blackactivity.EditProductActivity$SaveProductDetails.doInBackground(EditProductActivity.java:244)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at com.example.blackactivity.EditProductActivity$SaveProductDetails.doInBackground(EditProductActivity.java:212)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at android.os.AsyncTask$2.call(AsyncTask.java:295)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
10-21 06:54:32.115 3690-3934/com.example.blackactivity E/AndroidRuntime: at java.lang.Thread.run(Thread.java:818)
10-21 06:54:32.238 3690-3712/com.example.blackactivity W/EGL_emulation: eglSurfaceAttrib not implemented
10-21 06:54:32.238 3690-3712/com.example.blackactivity W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xad79d140, error=EGL_SUCCESS
10-21 06:54:33.090 3690-3690/com.example.blackactivity I/Choreographer: Skipped 48 frames! The application may be doing too much work on its main thread.
10-21 06:54:33.516 3690-3712/com.example.blackactivity W/EGL_emulation: eglSurfaceAttrib not implemented
10-21 06:54:33.516 3690-3712/com.example.blackactivity W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xa41a7a40, error=EGL_SUCCESS
10-21 06:54:34.045 3690-3712/com.example.blackactivity E/Surface: getSlotFromBufferLocked: unknown buffer: 0xabe23a40
10-21 06:54:34.204 3690-3712/com.example.blackactivity E/Surface: getSlotFromBufferLocked: unknown buffer: 0xabe23260
这是我正在运行的代码：
package com.example.blackactivity;
/**
* Created by mtjict on 19-10-2015.
*/
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 android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
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;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// single product url
private static final String url_product_detials = "http://192.168.178.14/android_connect/get_product_details.php";
// url to update product
private static final String url_update_product = "http://192.168.178.14/android_connect/update_product.php";
// url to delete product
private static final String url_delete_product = "http://192.168.178.14/android_connect/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";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_product);
// save button
btnSave = (Button) findViewById(R.id.btnSave);
btnDelete = (Button) findViewById(R.id.btnDelete);
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectDiskReads()
.detectDiskWrites()
.detectNetwork() // or .detectAll() for all detectable problems
.penaltyLog()
.build());
StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
.detectLeakedSqlLiteObjects()
.detectLeakedClosableObjects()
.penaltyLog()
.penaltyDeath()
.build());
// 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 arg0) {
// starting background task to update product
String name = txtName.getText().toString();
String price = txtPrice.getText().toString();
String description = txtDesc.getText().toString();
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();
}
});
}
/**
* 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(EditProductActivity.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
runOnUiThread(new Runnable() { ///ZIT HIER HET PROBLEEM?????
public void run() {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
System.out.print(pid);
//??? Missing parameters
// getting product details by making HTTP request
// Note that product details url will use GET request
// check your log for json response
JSONObject json = jsonParser.makeHttpRequest(url_product_detials, "GET", params); ///??????????????????????????????????
// JSONObject json =jsonParser.makeHttpRequest("http://192.168.178.14/android_connect/get_product_details.php","GET",{"pid":"1"});
Log.d("Single Product Details", json.toString());
// 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
JSONObject product = productObj.getJSONObject(0);
// product with this pid found
// Edit Text
txtName = (EditText) findViewById(R.id.inputName);
txtPrice = (EditText) findViewById(R.id.inputPrice);
txtDesc = (EditText) findViewById(R.id.inputDesc);
// display product data in EditText
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;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
}
/**
* 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(EditProductActivity.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();
// 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));
String name = args[0];
String price = args[1];
String description = args[2];
// sending modified data through http request
// Notice that update product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_update_product,
"POST", params);
// check json success tag
try {
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 {
// 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(EditProductActivity.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();
}
}
}
答案 0 :(得分：0)
在访问阵列之前，您应该检查是否有三个参数：
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();
// 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));
String name = null;
String price = null;
String description = null;
if (args.length>0) {
name=args[0]
}
if (args.length>1) {
price=args[1]
}
if (args.length>2) {
description =args[0]
}
答案 1 :(得分：0)
在btnSave.setOnClickListener
new SaveProductDetails().execute();
与
new SaveProductDetails().execute(name, price, description);
有关详情，请浏览this链接。