Setting text and adding listener in android

Question

I have made an Android blank project, then in the activity.xml page I added buttons and TextViews to the panel.

I want a code in the activity.java that changes the TextView in the activity if a button is pressed, how do I do that?

What I found out is the id in the .java file would be the following:

• R.id.TextView1 for TextView
• R.id.Button01 for Button

I want when I press the button the text is set to "hi", can someone help me with this please? I am new to android and google search have failed me or use some weird way I don't understand. I need the basics.

Answer 1

just replace this oncreate with yours and your code will work.

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

        Button button = (Button) findViewById(R.id.Button01); // get the button object
        textView = (TextView) findViewById(R.id.TextView1); // get the textView object

        button.setOnClickListener( new View.OnClickListener() { // set the click listener for the button
            @Override
            public void onClick(View view) {
                textView.setText("hi"); 
            }
        });
    }