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Question

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_expenses__add); 
    amount = (EditText) findViewById(R.id.et_amount); 
    date1 = (EditText) findViewById(R.id.date); 
    button = (Button) findViewById(R.id.btn_add); 
    button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      amount1 = amount.getText().toString(); 
      SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy"); 
      String dateInString = date1.getText().toString(); 
      try { 

       Date date = formatter.parse(dateInString); 
       myText=formatter.format(date); 
      } 
      catch (ParseException e) { 
       e.printStackTrace(); 
      } 
      Toast.makeText(Expenses_Add.this,myText,Toast.LENGTH_LONG).show(); 
     } 
    }); 
    RequestQueue requestQueue = Volley.newRequestQueue(Expenses_Add.this); 
    StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() { 
     @Override 
     public void onResponse(String response) { 
     } 
    }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
     } 
    } 

    ) { 
     protected Map<String, String> getParams() { 
      Map<String, String> params = new HashMap<String, String>(); 

      params.put("date",String.valueOf(myText)); 
      params.put("email", "bdshah437@gmail.com"); 
      params.put("amount", amount1); 

      return params; 
     } 
    }; 

     requestQueue.add(stringRequest); 
} protected void onStart() { 
    super.onStart(); 
    EditText editText = (EditText) findViewById(R.id.date); 
    editText.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
     @Override 
     public void onFocusChange(View view, boolean b) { 
      if (b) { 
       DateDialog dateDialog = new DateDialog(view); 
       android.app.FragmentTransaction ft = getFragmentManager().beginTransaction(); 

       dateDialog.show(ft, "DatePicker"); 
      } 
     } 
    }); 
} 
} 

における例外およびもつ誤差

09-11 04 48.006 16973から17061/com.example.bhoomi.household E /ボレー： [42344] NetworkDispatcher.run：未処理com.androidで例外 java.net.URLEncoder.encode（URLEncoder.java:57）でlibcore.net.UriCodec.encode（UriCodec.java:132） でjava.lang.NullPointerExceptionがjava.lang.NullPointerExceptionが .volley.Request.encodeParameters（Request.java:45） com.android.volleyでcom.android.volley.toolbox.HurlStack.addBodyIfExists（HurlStack.java:260） でcom.android.volley.Request.getBodyにおける0） （Request.java:436） 。 toolbox.HurlStack.setConnectionParametersForRequest（HurlStack.java:234） でcom.android.volley.toolbox.HurlStack.performRequest（HurlStack.java:107） com.android.volley.toolbox.BasicNetwork.performRequest（BasicNetworkました。 java：96） at com.android.volley.NetworkDispatcher.run（NetworkDispatcher.java:112）

Answer 1

あなたのボタンの新しいMySingletonクラス

public class MySingleton{ 
     private static MySingleton mInstance; 
     private RequestQueue mRequestQueue; 
     private ImageLoader mImageLoader; 
     private static Context mCtx; 

     private MySingleton(Context context) { 
      mCtx = context; 
      mRequestQueue = getRequestQueue(); 

      mImageLoader = new ImageLoader(mRequestQueue, 
        new ImageLoader.ImageCache() { 
         private final LruCache<String, Bitmap> 
           cache = new LruCache<String, Bitmap>(20); 

         @Override 
         public Bitmap getBitmap(String url) { 
          return cache.get(url); 
         } 

         @Override 
         public void putBitmap(String url, Bitmap bitmap) { 
          cache.put(url, bitmap); 
         } 
        }); 
     } 

     public static synchronized MySingleton getInstance(Context context) { 
      if (mInstance == null) { 
       mInstance = new MySingleton(context); 
      } 
      return mInstance; 
     } 

     public RequestQueue getRequestQueue() { 
      if (mRequestQueue == null) { 
       // getApplicationContext() is key, it keeps you from leaking the 
       // Activity or BroadcastReceiver if someone passes one in. 
       mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext()); 
      } 
      return mRequestQueue; 
     } 

     public <T> void addToRequestQueue(Request<T> req) { 
      getRequestQueue().add(req); 
     } 

     public ImageLoader getImageLoader() { 
      return mImageLoader; 
     } 

     public void cancelPendingRequests(Object tag) { 
      if (mRequestQueue != null) { 
       mRequestQueue.cancelAll(tag); 
      } 
     } 
    } 

コールを作成するには、url` `のためにどのような値を使用している

StringRequest stringRequest = new StringRequest(Request.Method.POST,url, 
        new Response.Listener<String>() { 
         @Override 
         public void onResponse(String response) { 
          Log.d("---response--", "" + response); 
         } 
        }, 
        new Response.ErrorListener() { 
         @Override 
         public void onErrorResponse(VolleyError error) { 
          Log.d("error---", "" + error.toString()); 
         } 
        }) { 
       @Override 
       protected Map<String, String> getParams() { 
        Map<String, String> params = new HashMap<String, String>(); 

        params.put("date",String.valueOf(myText)); 
        params.put("email", "bdshah437@gmail.com"); 
        params.put("amount", amount1); 

        return params; 
       } 
      }; 
      MySingleton.getInstance(Expenses_Add.this).addToRequestQueue(stringRequest);