Question

从call.eneque添加代码后，我从标题中得到了错误，提示我的clickListener上出现Nullpointerexception，但是一切都已初始化，或者我忽略了什么？我花了好几个小时才能尝试其他教程和修复程序，但找不到任何东西。

这是我的代码：

public void openDialog(){
        AlertDialog.Builder formBuilder = new AlertDialog.Builder(FriendListActivity.this);
        View formView = getLayoutInflater().inflate(R.layout.contact_add_form,null);
        final AlertDialog dialog = formBuilder.create();
        final EditText nameText = dialog.findViewById(R.id.nameInput);
        formBuilder.setView(formView);
         dialog.show();


        // Buttons

        sButton = dialog.findViewById(R.id.saveButton);
        sButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                PalaverService friendsAddService = PalaverApiClient.getInstance();
                final String FriendName = nameText.getText().toString();
                Call<ApiResponse> call = friendsAddService.addFriend("", "", FriendName);
                call.enqueue(new Callback<ApiResponse>() {
                    @Override
                    public void onResponse(Call<ApiResponse> call, Response<ApiResponse> response) {
                        ApiResponse responseSuccess = response.body();

                        if(responseSuccess.getMessageType().equals(1)){
                            friendListAdapter.add(FriendName);
                        }
                        dialog.hide();

                    }

                    @Override
                    public void onFailure(Call<ApiResponse> call, Throwable t) {

                    }
                });



            }
        });

        abbrechen = dialog.findViewById(R.id.abbrechen);
        abbrechen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    dialog.hide();
            }
        });



    }

这是我的错误：

  Process: de.paluno.se.palaver, PID: 16209
        java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

我的setOnclickListener出现错误。希望有人能给我指点。

Answer 1

您必须从formView

获取按钮小部件

    View formView = getLayoutInflater().inflate(R.layout.contact_add_form,null);
    final EditText nameText = formView.findViewById(R.id.nameInput);
    sButton = formView.findViewById(R.id.saveButton);

如何在setOnclicklistener中修复Nullpointerexception

1 个答案: