android find view by id example

Example: android get id of view

public void onClick(View v) {
    switch (v.getId()) {
    case R.id.add_04:
        Toast.makeText(MainActivity.this, "1", Toast.LENGTH_LONG).show();
        break;
    case R.id.add_05:
        Toast.makeText(MainActivity.this, "2", Toast.LENGTH_LONG).show();
        break;
    }
}