EditText需要更改颜色侦听器

Question

hey this is my code i need some help please when the user enter his user id the edit text needs to go from red to green the code is working but only if you enter your user id and then press enter i need it to automatically change color.

editText1_id.Setontextchanged(new View.OnClickListener() {

        @Override
        public void onClick(View view) {

            if (editText1_id.getText().toString().isEmpty()) {
                Toast.makeText(getApplicationContext()," Please insert your User ID", Toast.LENGTH_SHORT).show();
            }else if ((editText1_id.length() < 4)){
                makeToastLogin("Please insert your User ID");
            } else {
                userId = editText1_id.getText().toString();
            }
            if (editText1_id.getText().toString().isEmpty()) {
                editText1_id.setBackgroundResource(R.drawable.buttonshap_red_outline);
            }else if (editText1_id.length() < 4){
                editText1_id.setBackgroundResource(R.drawable.buttonshap_red_outline);
            }else if (editText1_id.length() == 4) {
                editText1_id.setBackgroundResource(R.drawable.insert_frame);
            } else {
                editText1_id.setBackgroundResource(R.drawable.insert_frame);
            }

        }

    });

Answer 1

you can put your code inside TextWatcher like this:

editText1_id.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            if (editText1_id.getText().toString().isEmpty()) {
                editText1_id.setBackgroundResource(R.drawable.buttonshap_red_outline);
            }else if (editText1_id.length() < 4){
                editText1_id.setBackgroundResource(R.drawable.buttonshap_red_outline);
            }else if (editText1_id.length() == 4) {
                editText1_id.setBackgroundResource(R.drawable.insert_frame);
            } else {
                editText1_id.setBackgroundResource(R.drawable.insert_frame);
            }
        }
    });

as you can see you can add addTextChangedListener to each EditText . it has three listener that help you to notice when user start typing

Answer 2

You cannot use an OnClickListener, you need a TextWatcher. See this answer: https://stackoverflow.com/a/11134227/3673616

Answer 3

听起来好像您正在尝试执行此操作，但您想要的不是2，而是4： Android开发：如何使用onKeyUp？