Android Studio Button to clear TextView text

Question

I want to make a button to clear the TextView text. Im using Android Studio.

ImageButton ImageButton3;
TextView TextView26;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ImageButton3.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            TextView.text="";
        }
    });

Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — Zoe stands with Ukraine, Oct 15 '17 at 18:38
Possible duplicate of [Android - Set text to TextView](https://stackoverflow.com/questions/19452269/android-set-text-to-textview) — DiskJunky, Oct 15 '17 at 18:45

Juan · Answer 1 · 2017-10-15T18:31:10.303

You have to instantiate the text view:

ImageButton ImageButton3;
TextView TextView26;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    TextView26 = (TextView) findViewById(R.id.<your text view id>);

    ImageButton3.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            TextView26.setText=("");
        }
    });

score 0 · Accepted Answer · answered Oct 15 '17 at 18:19

You forgot to instantiate your views for ImageButton and TextView.

ImageButton ImageButton3;
TextView TextView26;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ImageButton3 = (ImageButton) findViewById(R.id.myImgBtnId);
    TextView26 = (TextView) findViewById(R.id.myTvId);

    ImageButton3.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            TextView26.text="";
        }
    });

score 0 · Answer 3 · answered Oct 15 '17 at 18:51

I would recommend you to name your variables in camel case.
Also if you can choose a more meaningful name it will be better.

You gotta find BOTH your views before you can manipulate them in your code.

ImageButton imageButton3; //name to clearTextButton?
TextView textView26; 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    imageButton3 = (ImageButton) findViewById(R.id.imgButtonId); //replace it with your true id in your xml
    textView26 = (TextView) findViewById(R.id.textViewId);

    imageButton3.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        textView26.setText("");
    }
});

Android Studio Button to clear TextView text

3 Answers3