ANDROID PRACTICAL NO : 3 CHANGE THE TEXT OF A TEXTVIEW ON A CLICK OF A BUTTON.

NOTE : BEFORE RUNNING YOUR ANDROID PROGRAM START YOU AVD (ANDROID VIRTUAL DEVICE) AND THEN START TO CODE
SO THAT IT WILL NOT TAKE MORE TIME TO GET AVD BOOT UP… IN MY CASE I AM USING BLUESTACKS EMULATOR…

OPEN ANDROID STUDIO CREATE A NEW PROJECT.

AFTER THE PROJECT IS LOADED AND THE GRADLE SYNC IS FINISHED..

GO TO ACTIVITY_MAIN.XML FILE WHICH IS PRESENT UNDER LAYOUT FOLDER …

NOTE : CHANGE THE LAYOUT TO RELATIVELAYOUT AND REMOVE THE DEFAULT TEXTVIEW…

SELECT DESIGN MODE AND JUST DRAG N DROP A BUTTON AND A TEXTVIEW.
CHANGE THE TEXT ON THE TEXTVIEW AND BUTTON .
YOU CAN CHANGE THE SIZE OF THESE CONTROLS BUTTONS AND TEXTVIEW..

AFTER DESIGNING THE UI.. GO TO THE MainActivity.java import the following packages…

import android.widget.TextView;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;

Type the following code just under the onCreate() method…

final Button b1 = findViewById(R.id.button);
final TextView t1 = findViewById(R.id.textView);
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
t1.setText(“HELLO SYCS”);
}
});

THATS IT RUN YOUR PROGRAM..

ALSO NOTE THAT V IS CAPITAL IN “textView” LETS CLICK ON THE BUTTON TO SEE THE EFFECT.. 🙂 OUR TEXT GOT CHANGED… 🙂

YOU WILL HAVE TO SELECT YOUR AVD DEVICE THAT I TOLD PREVIOUSLY….

HOW TO START AVD , ITS SIMPLE GO TO THIS LOCATION FOLLOW ME…
YOU WILL HAVE SOME OF THE DEVICE PRESENT HERE…
OUR APP HAS BEEN INSTALLED LETS CHECK…

THANKS FOR WATCHING GUYS.. 🙂 🙂