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Creo que la linea 17 es la creacion del TextView:
public class MainActivity extends ActionBarActivity {
TextView texto = (TextView)findViewById(R.id.texto);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
Button boton = (Button) findViewById(R.id.boton);
boton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
texto.setText("El boton anda.");
}
});
}
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