java.lang.IllegalStateException occour而下面的代碼運行

Question

當我運行下面的代碼時，應用程序崩潰

private void checkLogin(final String email, final String password) { 

    // Tag used to cancel the request 
    String tag_string_req = "req_login"; 

    pDialog.setMessage("Logging in ..."); 
    showDialog(); 

    StringRequest strReq = new StringRequest(Request.Method.POST, 
      AppConfig.URL_REGISTER, new Response.Listener<String>() { 

     @Override 
     public void onResponse(String response) { 
      Log.d(TAG, "Login Response: " + response.toString()); 
      hideDialog(); 

      try { 
       JSONObject jObj = new JSONObject(response); 
       boolean error = jObj.getBoolean("error"); 

       // Check for error node in json 
       if (!error) { 
        // user successfully logged in 
        // Create login session 
        session.setLogin(true); 

        // Launch main activity 
        Intent intent = new Intent(LoginActivity.this, 
          MainActivity.class); 
        startActivity(intent); 
        finish(); 
       } else { 
        // Error in login. Get the error message 
        String errorMsg = jObj.getString("error_msg"); 
        Toast.makeText(getApplicationContext(), 
          errorMsg, Toast.LENGTH_LONG).show(); 
       } 
      } catch (JSONException e) { 
       // JSON error 
       e.printStackTrace(); 
      } 

     } 
    }, new Response.ErrorListener() { 

     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.e(TAG, "Login Error: " + error.getMessage()); 
      Toast.makeText(getApplicationContext(), 
        error.getMessage(), Toast.LENGTH_LONG).show(); 
      hideDialog(); 
     } 
    }) { 

     @Override 
     protected Map<String, String> getParams() { 
      // Posting parameters to login url 
      Map<String, String> params = new HashMap<String, String>(); 
      params.put("tag", "login"); 
      params.put("email", email); 
      params.put("password", password); 

      return params; 
     } 

    }; 

    // Adding request to request queue 
    AppController.getInstance().addToRequestQueue(strReq, tag_string_req); 
} 

這裏而崩潰

10-08 14:20:41.853 20940-20940/? E/AndroidRuntime: FATAL EXCEPTION: main 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime: Process: com.security.amr.isk, PID: 20940 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime: java.lang.IllegalStateException: Could not execute method of the activity 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View$1.onClick(View.java:3858) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View.performClick(View.java:4473) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View$PerformClick.run(View.java:18472) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Handler.handleCallback(Handler.java:733) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:95) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:136) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5021) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:515) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime: Caused by: java.lang.reflect.InvocationTargetException 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:515) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View$1.onClick(View.java:3853) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View.performClick(View.java:4473) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View$PerformClick.run(View.java:18472) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Handler.handleCallback(Handler.java:733) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:95) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:136) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5021) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:515) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime: Caused by: java.lang.NullPointerException 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at com.security.amr.isk.LoginActivity.checkLogin(LoginActivity.java:202) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at com.security.amr.isk.LoginActivity.Login(LoginActivity.java:127) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:515) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View$1.onClick(View.java:3853) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View.performClick(View.java:4473) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.view.View$PerformClick.run(View.java:18472) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Handler.handleCallback(Handler.java:733) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:95) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:136) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5021) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:515) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643) 
10-08 14:20:41.853 20940-20940/? E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

在你的logcat它說logcat的響應

<i>java.lang.NullPointerException 10-08 14:20:41.853 20940-20940/?<i> E/AndroidRuntime: at com.security.amr.isk.LoginActivity.checkLogin(LoginActivity.java:202) 10-08 14:20:41.853 20940-20940/? E/AndroidRuntime: at com.security.amr.isk.LoginActivity.Login(LoginActivity.java:127)

從這裏我們可以說你有一個VA riable，還沒有分配yet.check你的登錄方法或oncreate，看看你是否忘記初始化一個變量。欲瞭解更多信息，我需要看到更多的代碼隊友。