Создание обработчика щелчка для View в Android

Question

Я пишу очень простое Android приложение, показывая различные формы на главном экране:

public class Figures extends Activity { 
    DemoView demoview; 
    int figure_type = 1; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     demoview = new DemoView(this); 
     setContentView(demoview); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.firstmenu, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch(item.getItemId()) { 
     case R.id.color_menu_item: 
      break; 
     case R.id.circle_menu_item: 
      figure_type = 0; 
      break; 
     case R.id.square_menu_item: 
      figure_type = 1; 
      break; 
     case R.id.triangle_menu_item: 
      figure_type = 2; 
      break; 
     case R.id.exit_menu_item: 
      super.finish(); 
      break; 
     default: 
      break; 
     } 
     return true; 
    } 

    private class DemoView extends View { 
     public DemoView(Context context) { 
      super(context); 
     } 

     @Override 
     protected void onDraw(Canvas canvas) { 
      super.onDraw(canvas); 

      Display display = getWindowManager().getDefaultDisplay(); 
      int width = display.getWidth(); 
      int height = display.getHeight(); 

      Paint paint = new Paint(); 
      paint.setStyle(Paint.Style.FILL);     
      paint.setColor(Color.WHITE); 
      canvas.drawPaint(paint); 

      if (figure_type == 0) 
      {     
       // circle 
       Random randomColor = new Random(); 
       paint.setColor(randomColor.nextInt()); 
       canvas.drawCircle(width/2, height/2-100, 100, paint); 
      } 
      else if (figure_type == 1) 
      {     
       // square 
       Random randomColor = new Random(); 
       paint.setColor(randomColor.nextInt()); 
       canvas.drawRect(80, 80, 220, 220, paint); 
      } 
      else if (figure_type == 2) 
      { 
       // triangle 
       Random randomColor = new Random(); 
       paint.setColor(randomColor.nextInt()); 

       Path path = new Path(); 
       path.moveTo(width/2, 30); 
       path.lineTo(width/2+100, height/2-50); 
       path.lineTo(70, 190); 
       path.close(); 
       canvas.drawPath(path, paint); 
      } 
     } 
    } 
} 

Как выполнить событие нажатия на экран (или DemoView) ?

Answer 1

Вам необходимо установить onClickListener на ваш взгляд. I.e in onCreate:

demo.setOnClickListener(new View.onClickListener() { 
    public void onClick (View v) { 
    // do click behavior here. 
    });