title: Draw Circle on touch
body: <p>I am trying to draw a circle where user touches screen . </p>
  
  <pre><code>public class MainActivity extends Activity implements OnTouchListener {
  
  LinearLayout layout;
  float x=0;
  float y=0;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.layout_main);
      layout=(LinearLayout)findViewById(R.id.layout);
      layout.addView(new CustomView(MainActivity.this));
  }
  
  public class CustomView extends View {
  
      Bitmap mBitmap;
      Paint paint;
      public CustomView(Context context) {
          super(context);
          mBitmap = Bitmap.createBitmap(400, 800, Bitmap.Config.ARGB_8888);
          paint=new Paint();
          paint.setColor(Color.RED);
          paint.setStyle(Style.FILL);
      }
  
      @Override
      protected void onDraw(Canvas canvas) {
          super.onDraw(canvas);
          canvas.setBitmap(mBitmap);
          canvas.drawCircle(x, y, 50, paint);
          Toast.makeText(MainActivity.this, "DDD", 1).show();
      }
  }
  
  @Override
  public boolean onTouch(View v, MotionEvent event) {
  
      if (event.getAction() == MotionEvent.ACTION_DOWN) {
      layout.invalidate();
  
      }
      return false;
  }}
  </code></pre>