Android Toast 消息未显示

Question

我有按钮。当用户点击按钮时，有一些条件，条件不满足则需要显示 Toast 但不显示 Toast 消息...

代码:已编辑

 Button addMe = (Button)findViewById(R.id.addMe);
    addMe.setOnClickListener(new OnClickListener() {
           public void onClick(View v) {
               if(selectedReason.equals("--Select--")){
                   Log.i("TAG","-----");
                   Toast.makeText(getBaseContext(), "Reason can not be blank", Toast.LENGTH_SHORT).show();
               }else if(selectedType.equals("--Select--")){
                   Toast.makeText(getParent(), "Discount type can not be blank", Toast.LENGTH_SHORT).show();
               }else{
                   if(selectedType.equals("Value")){
                       if(spc_amount.getText().toString().equals("")){
                           Log.i("TAG","-----");
                           Toast.makeText(getBaseContext(), "Discount type can not be blank", Toast.LENGTH_SHORT).show();
                       }else{
                           if(Double.parseDouble(spc_amount.getText().toString()) > invoiceValue){
                               Toast.makeText(getBaseContext(), "Amonut can not be grater than invoice", Toast.LENGTH_SHORT).show();
                           }else{
                               Discount dis = new Discount();
                               dis.setCriteriaName(selectedReason);
                               dis.setDiscountValue(Double.parseDouble(spc_amount.getText().toString()));
                               spDisList.put(1,dis);
                               tl.removeAllViews();
                            loadTableLayout();
                           }

                       }
                   }
               }
           }
    });

我尝试过使用 getParent() 、 getApplicationContext() 、 SpecialDiscountActivity.this 和 getBaseContext() 的上下文> 但不工作....

此 Toast 消息来自 Tab Activity Group

Answer 1

试试:

Toast.makeText(getBaseContext(), "Reason can not be blank", Toast.LENGTH_SHORT).show();

正是您在各处省略的 .show() 导致所有 toast 实例化，但从不执行。