我完全照着老师的代码敲的 ，可是就是点击没有反应，就好像start方法没用一样

public class MainActivity extends AppCompatActivity {
   private wuziqi_panel wuziqiPanel;

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

       wuziqiPanel = (wuziqi_panel) findViewById(R.id.wuziqi);

       Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
       setSupportActionBar(toolbar);

       FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
       fab.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
               Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                       .setAction("Action", null).show();
           }
       });
   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
       // Inflate the menu; this adds items to the action bar if it is present.
       getMenuInflater().inflate(R.menu.menu_main, menu);
       return true;
   }

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       // Handle action bar item clicks here. The action bar will
       // automatically handle clicks on the Home/Up button, so long
       // as you specify a parent activity in AndroidManifest.xml.
       int id = item.getItemId();

       //noinspection SimplifiableIfStatement
       if (id == R.id.action_settings) {
           wuziqiPanel.start();
           return true;
       }

       return super.onOptionsItemSelected(item);
   }

public void start(){
   mWhiteArray.clear();
   mBlackArray.clear();
   mIsGameOver = false;
   misWhiteWinner = false;
   invalidate();
}