我尝试使用TouchEvent创建一个简单的自定义视图。但是,如果我点击并拖动鼠标光标,没有任何内容被绘制。这是我应该在模拟器上测试TouchEvent的方式吗?还是我应该在真实设备上运行应用程序(在那里也无法工作)?谢谢。
public class TouchEventView extends View {
private Paint paint = new Paint();
private Path path = new Path();
public TouchEventView(Context context, AttributeSet attrs) {
super(context, attrs);
paint.setAntiAlias(true);
paint.setColor(Color.WHITE);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(5f);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawPath(path, paint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float eventX = event.getX();
float eventY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
path.moveTo(eventX, eventY);
return true;
case MotionEvent.ACTION_MOVE:
path.lineTo(eventX, eventY);
break;
case MotionEvent.ACTION_UP:
// nothing to do
break;
default:
return false;
}
// Schedules a repaint.
invalidate();
return true;
}
}
Log.d("DEBUG","Action Down");
,Log.d("DEBUG","Action Move");
和Log.d("DEBUG","Action Up");
放入您的case语句中,以确保您的触摸事件被捕获... - Rawr