Best way to implement View.OnClickListener in android

Question

Suppose we have an Activity with a lot of views on which OnClickListener is to be registered.

The most common way to implement this is to let the Activi

Answer 1

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button north,south,east,west;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    init();
    north.setOnClickListener(this);
    south.setOnClickListener(this);
    east.setOnClickListener(this);
    west.setOnClickListener(this);
}

private void init(){
    north = findViewById(R.id.north);
    south = findViewById(R.id.south);
    east = findViewById(R.id.east);
    west = findViewById(R.id.west);
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.north:
            Toast.makeText(MainActivity.this,"NORTH",Toast.LENGTH_SHORT).show();
            break;
        case R.id.south:
            Toast.makeText(MainActivity.this,"SOUTH",Toast.LENGTH_SHORT).show();
            break;
        case R.id.east:
            Toast.makeText(MainActivity.this,"EAST",Toast.LENGTH_SHORT).show();
            break;
        case R.id.west:
            Toast.makeText(MainActivity.this,"WEST",Toast.LENGTH_SHORT).show();
            break;
    }
  }
}