强行关闭在我的Android应用程序

问题描述：

我已经在那里有一个登录表单，更新细节形成一个Android应用程序等强行关闭在我的Android应用程序

每当我输入了错误的细节，应用程序停止工作和强制关闭对话框出现。

这是我的代码：

public class AllProductsActivity extends ListActivity 
    { 
     private ProgressDialog pDialog; 
     JSONParser jParser = new JSONParser(); 
     ArrayList<HashMap<String, String>> productsList; 
     private static String url_all_products = "http://192.168.1.4/android_connect/get_all_products.php"; 

     // JSON Node names 
     private static final String TAG_SUCCESS = "success"; 
     private static final String TAG_PRODUCTS = "products"; 
     private static final String TAG_PID = "pid"; 
     private static final String TAG_NAME = "name"; 

     // products JSONArray 
     JSONArray products = null; 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.all_products); 

    // Hashmap for ListView 
    productsList = new ArrayList<HashMap<String, String>>(); 

    // Loading products in Background Thread 
    new LoadAllProducts().execute(); 

    // Get listview 
    ListView lv = getListView(); 

    // on seleting single product 
    // launching Edit Product Screen 
    lv.setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 
      // getting values from selected ListItem 
      String pid = ((TextView) view.findViewById(R.id.pid)).getText() 
        .toString(); 

      // Starting new intent 
      Intent in = new Intent(getApplicationContext(), 
        EditProductActivity.class); 
      // sending pid to next activity 
      in.putExtra(TAG_PID, pid); 

      // starting new activity and expecting some response back 
      startActivityForResult(in, 100); 
     } 
    }); 

} 

// Response from Edit Product Activity 
@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    // if result code 100 
    if (resultCode == 100) { 
     // if result code 100 is received 
     // means user edited/deleted product 
     // reload this screen again 
     Intent intent = getIntent(); 
     finish(); 
     startActivity(intent); 
    } 

} 

/** 
* Background Async Task to Load all product by making HTTP Request 
* */ 
class LoadAllProducts extends AsyncTask<String, String, String> 
    { 
     /** 
    * Before starting background thread Show Progress Dialog 
    * */ 
    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     pDialog = new ProgressDialog(AllProductsActivity.this); 
     pDialog.setMessage("Loading products. Please wait..."); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(false); 
     pDialog.show(); 
    } 

    /** 
    * getting All products from url 
    * */ 
    protected String doInBackground(String... args) { 
     // Building Parameters 
     List<NameValuePair> params = new ArrayList<NameValuePair>(); 
     // getting JSON string from URL 
     JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params); 

     // Check your log cat for JSON reponse 
     Log.d("All Products: ", json.toString()); 

     try { 
      // Checking for SUCCESS TAG 
      int success = json.getInt(TAG_SUCCESS); 

      if (success == 1) { 
       // products found 
       // Getting Array of Products 
       products = json.getJSONArray(TAG_PRODUCTS); 

       // looping through All Products 
       for (int i = 0; i < products.length(); i++) { 
        JSONObject c = products.getJSONObject(i); 

        // Storing each json item in variable 
        String id = c.getString(TAG_PID); 
        String name = c.getString(TAG_NAME); 

        // creating new HashMap 
        HashMap<String, String> map = new HashMap<String, String>(); 

        // adding each child node to HashMap key => value 
        map.put(TAG_PID, id); 
        map.put(TAG_NAME, name); 

        // adding HashList to ArrayList 
        productsList.add(map); 
       } 
      } else { 
       // no products found 
       // Launch Add New product Activity 
       Intent i = new Intent(getApplicationContext(), 
         NewProductActivity.class); 
       // Closing all previous activities 
       i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
       startActivity(i); 
      } 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 

     return null; 
    } 

    /** 
    * After completing background task Dismiss the progress dialog 
    * **/ 
    protected void onPostExecute(String file_url) { 
     // dismiss the dialog after getting all products 
     pDialog.dismiss(); 
     // updating UI from Background Thread 
     runOnUiThread(new Runnable() { 
      public void run() { 
       /** 
       * Updating parsed JSON data into ListView 
       * */ 
       ListAdapter adapter = new SimpleAdapter(
         AllProductsActivity.this, productsList, 
         R.layout.list_item, new String[] { TAG_PID, 
           TAG_NAME}, 
         new int[] { R.id.pid, R.id.name }); 
       // updating listview 
       setListAdapter(adapter); 
      } 
     }); 
    } 
} 
}

UpdateDetails.java

public class UpdateDetails extends Activity 
    { 

     EditText inputName; 
     EditText inputAddress; 
     EditText inputPassword; 
     EditText confirmPassword; 
     EditText inputEmailId, inputMobileno; 

     // Progress Dialog 
     private ProgressDialog pDialog; 

    // JSON parser class 
     JSONParser jsonParser = new JSONParser(); 

     // JSON Node names 
     private static final String resp = "success"; 
     //private static final String Flag = "flag"; 

protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
      WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    setContentView(R.layout.updatedetails); 

     // Edit Text 
     inputName = (EditText) findViewById(R.id.editName); 
     inputAddress = (EditText) findViewById(R.id.editAddress); 
     inputPassword = (EditText) findViewById(R.id.editPassword); 
     confirmPassword=(EditText) findViewById(R.id.editConfirmPassword); 
     inputEmailId=(EditText) findViewById(R.id.editText2_emailid); 
     inputMobileno=(EditText) findViewById(R.id.editText1_mobile); 

     // Create button 
     Button update_details = (Button) findViewById(R.id.buttonUpdate); 

     // button click event 
     update_details.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View view) { 
       if (inputPassword == confirmPassword){ 
       // updating user in background thread 
       new UpdateUserDetails().execute(); 
       } 
       else { 
        //Some Sort Of Alert Box 
        Toast.makeText(getApplicationContext(), "Please Enter Valid Details", Toast.LENGTH_SHORT).show(); 
        } 
      } 
     }); 
    } 

    /** 
    * Background Async Task to Create new product 
    * */ 
    class UpdateUserDetails extends AsyncTask<String, String, String> { 
     /** 
     * Before starting background thread Show Progress Dialog 
     * */ 
     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(UpdateDetails.this); 
      pDialog.setMessage("Updating User Details.. Please wait"); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(false); 
      pDialog.show(); 
     } 

     /** 
     * Updating User 
     * */ 
     protected String doInBackground(String... args) { 
      String name = inputName.getText().toString(); 
      String address = inputAddress.getText().toString(); 
      String password = inputPassword.getText().toString(); 
      String mobileno = inputMobileno.getText().toString(); 
      String emailid = inputEmailId.getText().toString(); 

      // Building Parameters 
      List<NameValuePair> params = new ArrayList<NameValuePair>(); 
      params.add(new BasicNameValuePair("name", name)); 
      params.add(new BasicNameValuePair("address", address)); 
      params.add(new BasicNameValuePair("password", password)); 
      params.add(new BasicNameValuePair("mobile_no", mobileno)); 
      params.add(new BasicNameValuePair("email_id",emailid)); 

      final String url_user = "http://"+ Login.serve +"/catxam/android_update.php"; 

      // getting JSON Object 
      JSONObject json = jsonParser.makeHttpRequest(url_user,"POST", params); 

      // check log cat from response 
      Log.d("Update Response", json.toString()); 

      // check for success tag 
      try { 
       int success = json.getInt(resp); 

       if (success == 1) { 
        // successfully update user 
        Intent i = new Intent(getApplicationContext(), MainActivity.class); 
        startActivity(i); 

        // closing this screen 
        finish(); 
       } else { 
        Toast.makeText(getApplicationContext(), "Unsuccessful Updation", Toast.LENGTH_SHORT).show(); 
       } 
      } 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(); 
     } 

    } 
}

谁能帮我识别我的错误，并帮助我在我的项目修正错误。

我感谢您的帮助。在此先感谢

这里是logCat窗口！

02-13 19:32:10.096: E/AndroidRuntime(7328): FATAL EXCEPTION: AsyncTask #2 

02-13 19:32:10.096: E/AndroidRuntime(7328): java.lang.RuntimeException: An error occured while executing doInBackground() 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at android.os.AsyncTask$3.done(AsyncTask.java:299) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at java.util.concurrent.FutureTask.run(FutureTask.java:239) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at java.lang.Thread.run(Thread.java:838) 

02-13 19:32:10.096: E/AndroidRuntime(7328): Caused by: java.lang.NullPointerException 
02-13 19:32:10.096: E/AndroidRuntime(7328):  at 
com.example.catxam.Login$CreateNewUser.doInBackground(Login.java:146) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at com.example.catxam.Login$CreateNewUser.doInBackground(Login.java:1) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at android.os.AsyncTask$2.call(AsyncTask.java:287) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  at java.util.concurrent.FutureTask.run(FutureTask.java:234) 

02-13 19:32:10.096: E/AndroidRuntime(7328):  ... 4 more

抱歉无法张贴图片:(

请发布logcat错误 – 2Dee

okkkk等待。将很快发布 –

Login.java中的第176行是什么？你确定当你做'products.length'时，产品不是null？最后，在UpdateDatils中，你确定要做'inputPassword == confirmPassword'吗？你正在比较2 EditText引用，而不是内部的文本，所以这永远不会评估为真... – 2Dee

答

Excecute这postExecute。要显示或传递给另一个活动，在postExecute使用。只有主营业务在doInBackground执行。

 try { 
      int success = json.getInt(resp); 

      if (success == 1) { 
       // successfully update user 
       Intent i = new Intent(getApplicationContext(), MainActivity.class); 
       startActivity(i); 

       // closing this screen 
       finish(); 
      } else { 
       Toast.makeText(getApplicationContext(), "Unsuccessful Updation", Toast.LENGTH_SHORT).show(); 
      } 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     }

答

不能从doInBackground方法拨打电话到Toast.makeText，因为它需要在UI线程上完成的。

做到这一点，在doInBackground结束：

// check for success tag 
try { 
    int success = json.getInt(resp); 
    String success = success == 1 ? "success" : null; 
    return success; 
} catch (JSONException e) { 
    e.printStackTrace(); 
    return null; 
}

而这onPostExecute：

protected void onPostExecute(String result) { 
    if (result!= null) { 
     // successfully update user 
     Intent i = new Intent(getApplicationContext(), MainActivity.class); 
     startActivity(i); 
     // closing this screen 
     finish(); 
    } else { 
     Toast.makeText(getApplicationContext(), "Unsuccessful Updation", Toast.LENGTH_SHORT).show(); 
    } 
    pDialog.dismiss(); 
}

此外，你不应该在LoadAllProducts做到这一点：

// updating UI from Background Thread 
runOnUiThread(new Runnable()

onPostExecute是专为你在后台任务结束时更新UI，因此您不需要创建额外的线程来执行该代码。

答

在其他的答案，你的错误操作（虽然没有logcat的......）是你拨打：

Toast.makeText(getApplicationContext(), "Unsuccessful Updation", Toast.LENGTH_SHORT).show();

在doInBackground，UI操作只允许在UI线程。在另一方面，你不需要：

runOnUiThread(new Runnable() {

在 onPostExecute

，因为它已经在UI线程上执行，所以你应该使用onPostExecute你敬酒的消息。

强行关闭在我的Android应用程序

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