Snackbar显示空指针异常

Snackbar在fragment中显示空指针异常。我在Onfailure error.Default中实现了Snackbar。Snackbar在fragment中显示空指针异常。我在Onfailure中实现了Snackbar error.Snackbar显示null在fragment中的指针异常。我在Onfailure错误中实现了Snackbar。Snackbar显示空指针异常

公共类SignInOtpFragment扩展片段{

@BindView(R.id.tv_generate_otp) 
TextView tvGenerateOtp; 
@BindView(R.id.et_mobile) 
TextInputEditText etMobile; 
@BindView(R.id.constraintLayout) 
ConstraintLayout mConstraintLayout; 

String MobilePattern = "[0-9]{10}"; 

@Override 
public View onCreateView(LayoutInflater inflater, 
         ViewGroup container, 
         Bundle savedInstanceState) { 
    View fragmentView = inflater.inflate(R.layout.generate_otp, container, false); 
    ButterKnife.bind(this, fragmentView); 
    getActivity().setTitle("Sign In"); 

    return fragmentView; 
} 

@Override 
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 
    super.onViewCreated(view, savedInstanceState); 
} 

@OnClick(R.id.tv_generate_otp) 
public void onGenerateOtpClick() { 
    validateAndLogin(); 
} 

private void validateAndLogin() { 
    if (etMobile.getText().toString().equalsIgnoreCase(null) || etMobile.getText().toString() == "") { 
     etMobile.setError("Please Enter a valid mobile number"); 
    } else if (!etMobile.getText().toString().matches(MobilePattern)) { 
     etMobile.setError("Please Enter a valid 10 digit number"); 
    } else { 
     registerUser(etMobile.getText().toString()); 
    } 
} 

private void registerUser(final String mobileNum) { 
    Log.e("--UserTYPE", AppConstants.USER_TYPE); 
    Log.e("--MobileNumber", mobileNum); 
    ApiClient.makeAPI().postRegister(mobileNum, 
      AppConstants.USER_TYPE).enqueue(new Callback<Register>() 

    { 
     @Override 
     public void onResponse(Call<Register> call, Response<Register> response) { 
      ApiClient.printCall(call, response, "Generate OTP"); 
      String status = response.body().getStatus();    

//    if (status.equalsIgnoreCase("1")) { 
      SharedPrefsUtils.setStringPreference(getActivity(), AppConstants.BASE_USER, response.body().getUserid()); 
      Bundle bundle = new Bundle(); 
      bundle.putString(AppConstants.KEY_MOBILE_NUM, mobileNum); 
      Fragment fragment = new SignInVerifyOtpFragment(); 
      fragment.setArguments(bundle); 
      //Move to VerifyOtp Fragment 
      if (getActivity() instanceof BaseActivity) { 
       (((BaseActivity) getActivity())).replaceFragment(R.id.container, fragment); 
      } 
      // etMobile.setText(""); 

     } 

     @Override 
     public void onFailure(Call<Register> call, Throwable t) { 
      Log.d("error", call.toString()); 
      Log.d("--Throwable", t.toString()); 
      // Fabric crashlytics issue. 
      Snackbar snackbar = Snackbar 
        .make(mConstraintLayout, "Error occured!", Snackbar.LENGTH_LONG); 
      snackbar.show(); 
     } 
    }); 
}

我的logcat显示：

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.view.ViewGroup.getContext()' on a null object reference 
     at android.support.design.widget.Snackbar.make(Snackbar.java:136) 
     at com.menu28.menu28.view.fragment.SignInOtpFragment$1.onFailure(SignInOtpFragment.java:105) 
     at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$2.run(ExecutorCallAdapterFactory.java:77) 
     at android.os.Handler.handleCallback(Handler.java:815) 
     at android.os.Handler.dispatchMessage(Handler.java:104) 
     at android.os.Looper.loop(Looper.java:194) 
     at android.app.ActivityThread.main(ActivityThread.java:5651) 
     at java.lang.reflect.Method.invoke(Method.java) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)

来源

2017-03-06 Vivek Pandey

你的'mConstraintLayout'为null。你最近在这个变量中写入一个值，但是尝试使用它。 –

当你是一个片段，我在想

Snackbar snackbar = Snackbar 
        .make(getView(), "Error occured!", Snackbar.LENGTH_LONG); 
      snackbar.show();

应该为你工作，问题是你传递给快餐栏的视图为空。

来源

2017-03-06 06:50:59

选择以下方法小吃店

public static void showMessage(Activity activity) { 
    Snackbar snackbar = Snackbar.make(activity.findViewById(android.R.id.content), 
      activity.getString(R.string.your_msg_string), Snackbar.LENGTH_LONG); 
    TextView textView = (TextView) snackbar.getView().findViewById(android.support.design.R.id.snackbar_text); 
    textView.setTextColor(Color.RED); 
    snackbar.show(); 
}

来源

2017-03-06 06:23:39

Snackbar显示空指针异常

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