Question

I am creating one parent Activity(Class) and then want to extends this class to another Activity(Class). I have some controls in all the Activities(Classes) so I decide to use Abstract class so that I need not write some common code in all the classes.I created below classes and one of it is abstract class.When I am calling my Welcomepage Activity this will display me a screen with all common controls(Radio buttons in my case).In Abstract class I had set checkedChangedListener listener and in onCheckedChanged() method I am creating a toast but It is not displaying.I am confused in this case.What is the reason to not displaying a toast?.

My Activity(Class) Welcomepage_pillReminder which extends CustomTabsActivity

public class Welcomepage_pillReminder extends CustomTabsActivity

    @Override
    public void mappingWidgets() {
        super.mappingWidgets();

    }

@Override
    public void addCheckChangedListner() {
        super.addCheckChangedListner();
    }

CustomActivity

public abstract class CustomTabsActivity extends Activity {
    protected RadioButton radHome;

    public void mappingWidgets(){
        radHome = (RadioButton)findViewById(R.id.radHome);
    }
    public void addCheckChangedListner() {
        radHome.setOnCheckedChangeListener(onCheckedChangeListener);
    }


    OnCheckedChangeListener onCheckedChangeListener = new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(isChecked) {
                if(buttonView.getText().equals("Home")) {
                    Toast.makeText(getApplicationContext(), "Home", 2000).show();
                }   
            }
        }
    };
}

Answer 1

You can do it like this,

Your CustomActivity.java

public class CustomActivity extends Activity implements OnClickListener{

    public void initLayout(Button button){
        button.setOnClickListener(this);
    }
     public void simple_method(){
            System.out.println("test in CustomActivity");
        }

    @Override
    public void onClick(View v) {
        Toast.makeText(getApplicationContext(), "Button Clicked in Custom Activity", Toast.LENGTH_LONG).show();
    }
}

Activity that extends CustomActivity
CustomClassDemoActivity.java

  public class CustomClassDemoActivity extends CustomActivity{
    Button button;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button = (Button) findViewById(R.id.myTextView);
        button.setText("This is a Custom Activity Example");
        super.initLayout(button);
        simple_method();
    }

    public void simple_method(){
        super.simple_method();
        System.out.println("test in mainClass");
    }
    @Override
    public void onClick(View v) {
        super.onClick(v);
        Toast.makeText(getApplicationContext(), "Button Clicked in Main Activity", Toast.LENGTH_LONG).show();
    }
}