How to change drawable resource at run time?

Question

I want to change the drawable resource file at runtime.

.java file code

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn = (Button)findViewById(R.id.button);
    edt1 = (EditText)findViewById(R.id.name);
    edt2 = (EditText)findViewById(R.id.password);
    str_name = edt1.getText().toString() ;
    str_password = edt2.getText().toString();

    if (str_name == 0 && str_password == 0) {
        btn.setBackgroundResource(R.drawable.image);
    }
    else {
        btn.setBackgroundResource(R.drawable.on_button_click);
    }

The thing is that it applies the if condition but when I enter some text in the EditText the resource file does not change.

EditText(s) are under TextInputLayout.

And you can't even compare an object with an integer, as you are currently trying to do. — Phantômaxx, Oct 14 '17 at 09:30

KeLiuyue · Accepted Answer · 2017-10-14T13:17:28.633

Use TextUtils.equals to judge whether str_name equals 0 or not .
Use TextUtils.equals to judge whether str_password equals 0 or not .

Try this .

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn = (Button) findViewById(R.id.button);
    edt1 = (EditText) findViewById(R.id.name);
    edt2 = (EditText) findViewById(R.id.password);
    str_name = edt1.getText().toString();
    str_password = edt2.getText().toString();

    // edited here
    if (TextUtils.equals(str_name, "0") && TextUtils.equals(str_password, "0")) {
        btn.setBackgroundResource(R.drawable.image);
    } else {
        btn.setBackgroundResource(R.drawable.on_button_click);
    }
}

Another way to solve it .

if (Double.parseDouble(str_name) == 0 && Double.parseDouble(str_password) == 0) {
    btn.setBackgroundResource(R.drawable.image);
} else {
    btn.setBackgroundResource(R.drawable.on_button_click);
}

score 0 · Answer 2 · answered Oct 14 '17 at 09:27

0

Replace your conditional statement with below code

if (str_name.equalsIgnoreCase("0") && str_password.equalsIgnoreCase("0") {

    btn.setBackgroundResource(R.drawable.image);

}

You cannot use == for comparing 2 strings. Hope that helps you.

answered Oct 14 '17 at 09:27

Abdul Waheed

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but didn't change the button values when i entered the text in edit texts – Uzair Mughal Oct 14 '17 at 09:46
Use this answer with EditText's addTextChangeListener method for both of your edittexts and place abdul's waheed code in afterTextChanged method. – Chirag Jain Oct 14 '17 at 13:46

How to change drawable resource at run time?

2 Answers2