Using Switch Statement to Handle Button Clicks

Question

I\'m trying to wrap my head around Views, Listeners etc. I have an Activity with 2 Buttons: buttonplay and buttonstop. My problem is I can\'t wrap my head around the Views

Answer 1

One mistake what i did was not including "implements OnClickListener" in the main class declaration. This is a sample code to clearly illustrate the use of switch case during on click. The code changes background colour as per the button pressed. Hope this helps.

public class MainActivity extends Activity  implements OnClickListener{


TextView displayText;
Button cred, cblack, cgreen, cyellow, cwhite;
LinearLayout buttonLayout;

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

    cred = (Button) findViewById(R.id.bred);
    cblack = (Button) findViewById(R.id.bblack);
    cgreen = (Button) findViewById(R.id.bgreen);
    cyellow = (Button) findViewById(R.id.byellow);
    cwhite = (Button) findViewById(R.id.bwhite);
    displayText = (TextView) findViewById(R.id.tvdisplay);
    buttonLayout = (LinearLayout) findViewById(R.id.llbuttons);

    cred.setOnClickListener(this);
    cblack.setOnClickListener(this);
    cgreen.setOnClickListener(this);
    cyellow.setOnClickListener(this);
    cwhite.setOnClickListener(this);
}

@Override
protected void onClick(View V){
    int id=V.getId();
    switch(id){
    case R.id.bred:
        displayText.setBackgroundColor(Color.rgb(255, 0, 0));
        vanishLayout();
        break;
    case R.id.bblack:
        displayText.setBackgroundColor(Color.rgb(0, 0, 0));
        vanishLayout();
        break;
    case R.id.byellow:
        displayText.setBackgroundColor(Color.rgb(255, 255, 0));
        vanishLayout();
        break;
    case R.id.bgreen:
        displayText.setBackgroundColor(Color.rgb(0, 255, 0));
        vanishLayout();
        break;
    case R.id.bwhite:
        displayText.setBackgroundColor(Color.rgb(255, 255, 255));
        vanishLayout();
        break;
    }
}