Android 事件触发机制的深入学习
Android 事件触发机制的深入学习
最近在研究android的事件触发和传播机制,说来很惭愧,web下的事件太熟悉不过了,可在android中却很郁闷,常用的触摸事件都糊里糊涂的,在网上看了半天,也整理一份,供大家参考:
public class CustomDefaultActivity implements OnTouchListener { private GestureDetector gd1; private TableLayout tableLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.custom_default); tableLayout = (TableLayout) findViewById(R.id.tableLayout); gd1 = new GestureDetector(CustomDefaultActivity.this, new MyGesture()); tableLayout.setOnTouchListener(this); tableLayout.setLongClickable(true); } @Override public boolean dispatchTouchEvent(MotionEvent event) { Log.e("-----------------------------------------------------------------------", "dispatchTouchEvent"); if (gd1.onTouchEvent(event)) { event.setAction(MotionEvent.ACTION_CANCEL); } return super.dispatchTouchEvent(event); } @Override public boolean onTouch(View arg0, MotionEvent arg1) { Log.e("-------", "onTouch"); return gd1.onTouchEvent(arg1); } public class MyGesture implements OnGestureListener { @Override public boolean onDown(MotionEvent arg0) { Log.e("-------", "onDown, 按下时触发[" + arg0.getX() + "," + arg0.getY() + "]"); return true; } @Override public void onLongPress(MotionEvent arg0) { Log.e("-------", "onLongPress,长时间按住时触发"); } @Override public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) { Log.e("-------", "onScroll,滑动拖动事件[" + arg0.getX() + "," + arg0.getY() + "]=[" + arg1.getX() + "," + arg1.getY() + "]"); return true; } @Override public boolean onFling(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) { Log.e("-------", "onFling, 滑动甩出事件"); return true; } @Override public void onShowPress(MotionEvent arg0) { Log.e("-------", "onShowPress,down事件发生,而move或up还没发生前触发该事件"); } @Override public boolean onSingleTapUp(MotionEvent arg0) { Log.e("-------", "onSingleTapUp 释放事件"); return true; } } }
监控触摸事件,主要是实现OnGestureListener类,并重写其中的几个方法,以监听事件发生。
感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!
赞 (0)