标签：android style blog http io color 使用 sp strong
Android系统按键操作最先是在dispatchKeyEvent中进行处理的，然后才是onKeyDown(int keyCode, KeyEvent event)和onKeyUp(int keyCode, KeyEvent event)。
同理，触摸操作也是先在dispatchTouchEvent中进行处理，在分发给onTouchEvent进行处理。
代码很简单，只要掌握好事件的分发顺序就ok了。
Activity中的代码：
@Override public boolean onKeyDown(int keyCode, KeyEvent event) { // TODO Auto-generated method stub Log.d("CPACM","onKeyDown"); return super.onKeyDown(keyCode, event); } @Override public boolean onKeyUp(int keyCode, KeyEvent event) { // TODO Auto-generated method stub Log.d("CPACM","onKeyUp"); return super.onKeyUp(keyCode, event); } @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub Log.d("CPACM","onTouchEvent"); return super.onTouchEvent(event); } @Override public boolean dispatchKeyEvent(KeyEvent event) { Log.d("CPACM","dispatchKeyEvent"); if(event.getKeyCode() == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){ if(System.currentTimeMillis() - preTime < 2000){//在两秒内，退出 return super.dispatchKeyEvent(event); }
Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
//System.exit(0); preTime = System.currentTimeMillis(); return true; } // TODO Auto-generated method stub return super.dispatchKeyEvent(event); } @Override public boolean dispatchTouchEvent(MotionEvent ev) { // TODO Auto-generated method stub Log.d("CPACM","dispatchTouchEvent"); return super.dispatchTouchEvent(ev); }
顺便附一张截图~
Android的简单应用（二）——使用dispatchKeyEvent双击退出程序
标签：android style blog http io color 使用 sp strong
原文地址：http://www.cnblogs.com/cpacm/p/4087070.html
